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1. An "on-off-on" fluorescent nanoprobe for recognition of chromium(VI) and ascorbic acid based on phosphorus/nitrogen dual-doped carbon quantum dot

Author:
Xiaojuan Gong; Yang Liu; Zhenhua Yang; Shaomin Shuang; Zeyu Zhang; Chuan Dong
Source:
Analytica chimica acta 2017 pp. -
ISSN:
0003-2670
Subject:
analytical chemistry; ascorbic acid; carbon quantum dots; chelation; chromium; detection limit; fluorescence; fruit juices; ions; models; mutagens; nitrogen; pH; phosphorus; raw fruit; reducing agents; toxicity
Abstract:
... Chromium (VI) [Cr(VI)] is a harsh environmental contaminates and has been proved to be highly toxic, carcinogenic and mutagenic. Therefore, developing an inexpensive, good selective and highly sensitive nanoprobe for the detection of Cr(VI) is in urgent demand. Recently, the highly fluorescent carbon quantum dots (CQDs) have been successfully utilized as efficient fluorescent nanoprobes for the de ...
DOI:
10.1016/j.aca.2017.02.038

2. (Oligo)thienyl-imidazo-benzocrown ether derivatives: Synthesis, photophysical studies and evaluation of their chemosensory properties

Author:
Rosa M.F. Batista; Elisabete Oliveira; Susana P.G. Costa; Carlos Lodeiro; M. Manuela M. Raposo
Source:
Talanta 2011 v.85 no.5 pp. 2470-2478
ISSN:
0039-9140
Subject:
absorption; cations; chelation; dimethyl sulfoxide; ethers; fluorescence; fluorescence emission spectroscopy; fluorometry; mercury; nickel; sodium
Abstract:
... A series of novel (oligo)thienyl-imidazo-benzocrown ethers were synthesised through a simple method and evaluated as fluorimetric chemosensors for transition metal cations. Interaction with Ni²⁺, Pd²⁺, and Hg²⁺ in ACN/DMSO solution (99:1) was studied by absorption and emission spectroscopy. Chemoselectivity studies in the presence of Na⁺ were also carried out and a fluorescence enhancement upon ch ...
DOI:
10.1016/j.talanta.2011.07.107

3. 1,1-Phosphinoboration of diazomethanes

Author:
Alina Trofimova; James H. W. LaFortune; Zheng-Wang Qu; Stephen A. Westcott; Douglas W. Stephan
Source:
Chemical communications 2019 v.55 no.80 pp. 12100-12103
ISSN:
1364-548X
Subject:
boron; chelation; heterocyclic compounds; zwitterions
Abstract:
... The reactions of the phosphinoboranes Ph₂PBMes₂, Ph₂PBpin, and Ph₂PBcat with the diazomethanes Ph₂CN₂, C₁₂H₈CN₂, and EtO₂CCHN₂ are shown to give products of 1,1-phosphinoboration. The products (1–6) are shown to have PNB linkages with three-coordinate boron centers, whereas the products (EtOOC)CNN(PR₂)(Bpin) (R = Ph 7, tBu 8) form zwitterionic heterocycles resulting from chelation of the ester car ...
DOI:
10.1039/c9cc06914c

4. 1,2-Diamines as the Amine Sources in Amidation and Rhodium-Catalyzed Asymmetric Reductive Amination Cascade Reactions

Author:
Rongrong Xie; Cungang Liu; Renwei Lin; Runchen Zhang; Haizhou Huang; Mingxin Chang
Source:
Organic letters 2022 v.24 no.31 pp. 5646-5650
ISSN:
1523-7052
Subject:
amination; chelation; diamines; ligands; rhodium
Abstract:
... The sturdy chelation of 1,2-diamines and transition-metals would retard or even interrupt the routine catalytic cycles. In the amidation and asymmetric reductive amination (ARA) cascade reactions of diamines and ketoesters, we deployed sets of additives to ensure a smooth transformation catalyzed by the complexes of rhodium and versatile and highly modular phosphoramidite-phosphine ligands. The tu ...
DOI:
10.1021/acs.orglett.2c01728

5. 2,2′-dipyridyl induces pexophagy

Author:
AiLin Jin; Joon No Lee; Min Soo Kim; SeongAe Kwak; Se-Jin Kim; Kyung Song; Seong-Kyu Choe; Raekil Park
Source:
Biochemical and biophysical research communications 2016 v.469 pp. 941-947
ISSN:
0006-291X
Subject:
autophagy; catalase; chelating agents; chelation; homeostasis; peroxisomes; phenotype; proteins; quality control; screening
Abstract:
... Pexophagy is the selective degradation of peroxisomes for maintaining peroxisome homeostasis within cells. Peroxisome dynamics and pexophagy are important events required to maintain the quality control of peroxisomes, thereby preventing peroxisome-associated diseases. To identify novel pexophagy modulators, we developed a cell-based screening system and selected 2,2′-dipyridyl (2,2-DP) as a candi ...
DOI:
10.1016/j.bbrc.2015.12.098

6. 2-Aminothiazole Functionalized Polystyrene for Selective Removal of Au(III) in Aqueous Solutions

Author:
Xiong Chunhua; Zhou Suguo; Liu Xiaozheng; Jia Qian; Ma Chunan; Zheng Xuming
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.6 pp. 2441-2448
ISSN:
1520-5045
Subject:
X-ray photoelectron spectroscopy; adsorption; aqueous solutions; cadmium; chelation; chlorides; cobalt; copper; desorption; engineering; gold; infrared spectroscopy; ions; models; nickel; nitrogen; polystyrenes; sorption isotherms; sulfur; thiourea
Abstract:
... A new chelating resin, polystyrene-2-aminothiazole (PS-AT), was synthesized via one-step reaction by grafting 2-aminothiazole in a chloromethylated polystyrene polymer. Its structure was characterized by elemental analysis and infrared spectroscopy. Batch experiments were applied to investigate the adsorption properties of PS-AT for Au(III) ions. The resin exhibits an excellent selectivity for Au( ...
DOI:
10.1021/ie403502r

7. 3-Hydroxyflavone derivatives: promising scaffolds for fluorescent imaging in cells

Author:
Xueke Zhao; Xiang Li; Shuyu Liang; Xiongwei Dong; Zhe Zhang
Source:
RSC advances 2021 v.11 no.46 pp. 28851-28862
ISSN:
2046-2069
Subject:
DNA; bioactive properties; chelation; flavonols; fluorescence; hydrophobicity; solvents
Abstract:
... As a typical class of excited-state intramolecular proton transfer (ESIPT) molecules, 3-hydroxyflavone derivatives (3HF, also known as flavonols) have received much attention recently. Thereinto, the role of hydrophobic microenvironment is significant importance in promoting the process and effects of ESIPT, which can be regulated by the solvents, the existence of metal ions and proteins rich with ...
DOI:
10.1039/d1ra04767a

8. 3D ZnO modified biochar-based hydrogels for removing U(VI) in aqueous solution

Author:
Yu Guo; Xiaoyang Liu; Shuibo Xie; Haiyan Liu; Chenxu Wang; Lingzhi Wang
Source:
Colloids and surfaces 2022 v.642 pp. 128606
ISSN:
0927-7757
Subject:
adsorption; aqueous solutions; biochar; chelation; hydrogels; ion exchange; pH; sorption isotherms; thermal stability; uranium
Abstract:
... A novel three dimensional ZnO modified biochar-based hydrogel (ZBCG) was fabricated and employed for removing U(VI) in aqueous solution. The ZBCG hydrogel, the successful loading of ZnO modified biochar (ZBC) confirmed by SEM and FTIR, has showed a well mechanical characteristics, thermal stability, anti-swelling property and adsorption performance for U(VI) than pure hydrogels (BG). At T = 40 ℃, ...
DOI:
10.1016/j.colsurfa.2022.128606

9. 3D antibody immobilization on a planar matrix surface

Author:
Bo Feng; Shirong Huang; Fei Ge; Yueping Luo; Dayong Jia; Youzhi Dai
Source:
Biosensors & bioelectronics 2011 v.28 no.1 pp. 91-96
ISSN:
0956-5663
Subject:
antibodies; biosensors; chelation; immunoassays; immunoglobulin G; mammals; nickel
Abstract:
... The amount of active capture antibodies immobilized per unit square is crucial to developing effective antibody chips, biosensors, immunoassays and other molecular recognition technologies. In this study, we present a novel yet simple method for oriented antibody immobilization at high density based on the formation of an orderly, organized aggregation of immunoglobulin G (IgG) and staphylococcal ...
DOI:
10.1016/j.bios.2011.07.003

10. 4-(2-Pyridylazo)-resorcinol Functionalized Thermosensitive Ionic Microgels for Optical Detection of Heavy Metal Ions at Nanomolar Level

Author:
Zhou Xianjing; Nie Jingjing; Du Binyang
Source:
ACS Applied Materials & Interfaces 2015 v.7 no.39 pp. 21966-21974
ISSN:
1944-8252
Subject:
aqueous solutions; chelation; color; colorimetry; copper; drinking water; heavy metals; lead; manganese; metal ions; nickel; nitrogen; pH; zinc
Abstract:
... 4-(2-Pyridylazo)-resorcinol (PAR) functionalized thermosensitive ionic microgels (PAR-MG) were synthesized by a one-pot quaternization method. The PAR-MG microgels were spherical in shape with radius of ca. 166.0 nm and narrow size distribution and exhibited thermo-sensitivity in aqueous solution. The PAR-MG microgels could optically detect trace heavy metal ions, such as Cu²⁺, Mn²⁺, Pb²⁺, Zn²⁺, a ...
DOI:
10.1021/acsami.5b06653

11. 9-Acridone-4-carboxylic acid as an efficient Cr(III) fluorescent sensor: Trace level detection, estimation and speciation studies

Author:
Debasis Karak; Arnab Banerjee; Animesh Sahana; Subarna Guha; Sisir Lohar; Susanta Sekhar Adhikari; Debasis Das
Source:
Journal of hazardous materials 2011 v.188 no.1-3 pp. 274-280
ISSN:
0304-3894
Subject:
Fourier transform infrared spectroscopy; chelation; chromium; equations; fluorescence; ions; spectral analysis
Abstract:
... 9-Acridone-4-carboxylic acid has been established as an efficient Cr(III) fluorescent sensor. The binding of this ligand with Cr(III) is confirmed by FTIR, thermal and mass spectral analysis of the product. Based on this chelation assisted fluorescence quenching, a highly sensitive spectrofluorometric method is developed for trace level detection, estimation and speciation studies of chromium in D ...
DOI:
10.1016/j.jhazmat.2011.01.110

12. 99mTc-Labeled Multifunctional Low-Generation Dendrimer-Entrapped Gold Nanoparticles for Targeted SPECT/CT Dual-Mode Imaging of Tumors

Author:
Li Xin; Xiong Zuogang; Xu Xiaoying; Luo Yu; Peng Chen; Shen Mingwu; Shi Xiangyang
Source:
ACS applied materials 2016 v.8 no.31 pp. 19883-19891
ISSN:
1944-8252
Subject:
chelation; cost effectiveness; folic acid; gold; image analysis; models; nanogold; neoplasm cells; neoplasms; polyethylene glycol; tomography
Abstract:
... Development of cost-effective and highly efficient nanoprobes for targeted tumor single-photon emission computed tomography (SPECT)/computed tomography (CT) dual-mode imaging remains a challenging task. Here, multifunctional dendrimer-entrapped gold nanoparticles (Au DENPs) modified with folic acid (FA) and labeled with ⁹⁹ᵐTc were synthesized for targeted dual-mode SPECT/CT imaging of tumors. Gene ...
DOI:
10.1021/acsami.6b04827

13. ACE inhibitory activities of two peptides derived from Volutharpa ampullacea perryi hydrolysate and their protective effects on H2O2 induced HUVECs injury

Author:
Chen-Xin Wang; Cheng-Cheng Song; Xin-Tong Liu; Bian-Wen Qiao; Shuang Song; Ying-Huan Fu
Source:
Food research international 2022 v.157 pp. 111402
ISSN:
0963-9969
Subject:
antihypertensive effect; chelation; dose response; endothelins; food research; functional foods; heme oxygenase (biliverdin-producing); humans; hydrogen; hydrogen peroxide; hydrolysates; malondialdehyde; molecular dynamics; peptidyl-dipeptidase A
Abstract:
... The purpose of this study is to explore the effects of IVTNWDDMEK and VGPAGPRG, two angiotensin I-converting enzyme (ACE) inhibitory peptides purified from Volutharpa ampullacea perryi, on ACE’s two domains and on nitric oxide (NO), endothelin-1(ET-1) production in human vascular endothelial cells (HUVECs). In addition, we sought to investigate the effects of these two peptides on HUVECs injury in ...
DOI:
10.1016/j.foodres.2022.111402

14. AIE + ESIPT activity-based NIR Cu²⁺ sensor with dye participated binding strategy

Author:
Jie Jiang; Haifeng Sun; Yanlei Hu; Gang Lu; Jiwei Cui; Jingcheng Hao
Source:
Chemical communications 2021 v.57 no.62 pp. 7685-7688
ISSN:
1364-548X
Subject:
chelation; fluorescent dyes; hydrolysis
Abstract:
... A novel activity-based Cu²⁺ fluorescent probe featuring multidentate binding sites was synthesized. It functions through chelation with Cu²⁺, which in turn specifically triggers hydrolysis of the probe to release a near-infrared emission with AIE + ESIPT properties. The probe was found to be capable of ratiometric imaging of Cu²⁺ in living HeLa cells. ...
DOI:
10.1039/d1cc02233d

15. Ability of selenium species to inhibit metal-induced Aβ aggregation involved in the development of Alzheimer’s disease

Author:
David Vicente-Zurdo; Iván Romero-Sánchez; Noelia Rosales-Conrado; María Eugenia León-González; Yolanda Madrid
Source:
Analytical and bioanalytical chemistry 2020 v.412 no.24 pp. 6485-6497
ISSN:
1618-2642
Subject:
amyloid; analytical chemistry; antioxidant activity; antioxidants; chelation; chitosan; chlorogenic acid; neurodegenerative diseases; peptides; polyphenols; selenium; selenomethionine
Abstract:
... Extracellular accumulation of amyloid beta peptide (Aβ) is believed to be one of the main factors responsible for neurodegeneration in Alzheimer’s disease (AD). Metals could induce Aβ aggregation, by their redox activity or binding properties to amyloid β fibrils, leading to their accumulation and deposition outside neurons. For this reason, metal chelation may have an acknowledged part to play in ...
DOI:
10.1007/s00216-020-02644-2

16. Abnormal activation of calpain and protein kinase Cα promotes a constitutive release of matrix metalloproteinase 9 in peripheral blood mononuclear cells from cystic fibrosis patients

Author:
Monica Averna; Margherita Bavestrello; Federico Cresta; Marco Pedrazzi; Roberta De Tullio; Laura Minicucci; Bianca Sparatore; Franca Salamino; Sandro Pontremoli; Edon Melloni
Source:
Archives of biochemistry and biophysics 2016 v.604 pp. 103-112
ISSN:
0003-9861
Subject:
calcium; calpain; chelation; cystic fibrosis; extracellular matrix; fibrosis; gelatinase B; homeostasis; homozygosity; humans; mononuclear leukocytes; patients; phosphorylation; protein kinase C; secretion; signal transduction
Abstract:
... Matrix metalloproteinase 9 (MMP9) is physiologically involved in remodeling the extracellular matrix components but its abnormal release has been observed in several human pathologies. We here report that peripheral blood mononuclear cells (PBMCs), isolated from cystic fibrosis (CF) patients homozygous for F508del-cystic fibrosis transmembrane conductance regulator (CFTR), express constitutively a ...
DOI:
10.1016/j.abb.2016.06.015

17. Absorption, translocation, and detoxification of Cd in two different castor bean (Ricinus communis L.) cultivars

Author:
Wenling Ye; Guifeng Guo; Fan Wu; Ting Fan; Hongjuan Lu; Haiyan Chen; Xuede Li; Youhua Ma
Source:
Environmental science and pollution research international 2018 v.25 no.29 pp. 28899-28906
ISSN:
0944-1344
Subject:
Ricinus communis; absorption; cadmium; castor beans; chelation; cultivars; glutathione; heavy metals; hydroponics; leaves; phloem; phytoremediation; phytotoxicity; pollutants; polluted soils; shoots; thiols; transportation; xylem
Abstract:
... Cadmium (Cd) is considered to be the most phytotoxic heavy metal pollutant. The selection of castor bean cultivars with Cd tolerance and the exploration of the physiological mechanisms involved in Cd tolerance are critical steps for improving phytoremediation performance. In this study, a hydroponic experiment was used to investigate variations in Cd transportation, chelation, and subcellular dist ...
DOI:
10.1007/s11356-018-2915-0

18. Accelerating Cu and Cd removal in soil flushing assisted by regulating permeability with electrolytes

Author:
Jingyi Feng; Qi Yu; Anfei He; G. Daniel Sheng
Source:
Chemosphere 2021 v.281 pp. 130883
ISSN:
0045-6535
Subject:
chelation; clay; heavy metals; ion exchange; permeability; remediation
Abstract:
... Soil flushing is one of the common in-situ remediation technologies, in which the permeability of the soil determines its feasibility. Batch extractions showed that deionized water extracted about 20% Cu and 30% Cd from a soil. Electrolytes of 100 mmol/l NaCl, 500 mmol/l NaCl, and 167 mmol/l CaCl₂ promoted the extractions to about 60% and 90%, respectively, with higher concentration and valence of ...
DOI:
10.1016/j.chemosphere.2021.130883

19. Accelerating effect of pigments on poly(acrylonitrile butadiene styrene) degradation

Author:
Emil Andersen; Line Hestbech Bertelsen; Mathias Salomonsen; Mikael Kristensen; Peter Kybelund; Martin Brorholt Sørensen; Mogens Hinge
Source:
Polymer degradation and stability 2020 v.178 pp. 109183
ISSN:
0141-3910
Subject:
Fourier transform infrared spectroscopy; brittleness; catalytic activity; chelation; copper; crosslinking; differential scanning calorimetry; durability; heat treatment; iron; iron oxides; oxidation; pigments; polymers; styrene; surface area
Abstract:
... Pigments such as iron oxides are readily used in combination with polymers and evaluating their influence on polymer durability is important to successfully evaluate lifetime of modern polymer products. This work presents heat-treatment at 60 °C of poly(acrylonitrile butadiene styrene) (ABS) compounded with 18 different pigments, with focus on five iron and three copper complex pigments loaded in ...
DOI:
10.1016/j.polymdegradstab.2020.109183

20. Access to adducts of parent iminoborane isomers, HBNH and NBH₂, using frustrated Lewis pair chelation

Author:
Brandon L. Frenette; Alvaro A. Omaña; Michael J. Ferguson; Yuqiao Zhou; Eric Rivard
Source:
Chemical communications 2021 v.57 no.83 pp. 10895-10898
ISSN:
1364-548X
Subject:
chelates; chelation; chemical communication; isomers; parenting; parents
Abstract:
... Adducts of the parent iminoborane isomers, HBNH and NBH₂, have been prepared, each stabilized by the frustrated Lewis pair (FLP) chelate ⁱPr₂P(C₆H₄)BCy₂ (PB). PB{HBNH} was accessed via dehydrohalogenation, while the corresponding isomer PB{NBH₂} was obtained from the borylation of the formal nitrene-FLP complex PB{NH}. ...
DOI:
10.1039/d1cc04923b

21. Accumulation and partitioning of toxic trace metal(loid)s in phytoliths of wheat grown in a multi-element contaminated soil

Author:
Linan Liu; Zhaoliang Song; Qiang Li; Rob M. Ellam; Jingchun Tang; Yangyang Wang; Binoy Sarkar; Hailong Wang
Source:
Environmental pollution 2022 v.294 pp. 118645
ISSN:
0269-7491
Subject:
arsenic; cadmium; chelation; copper; coprecipitation; crop quality; cropland; homeostasis; human health; lead; phytoliths; pollution; silica; silicon; toxicity; wheat; zinc
Abstract:
... Cropland contamination by toxic trace metal (loid)s (TTMs) has attracted increasing attention due to the serious consequential threat to crop quality and human health. Mitigation of plant TTM stress by silica amendment has been proposed recently. However, the relationship between the siliceous structure of phytoliths and TTMs in plants, and the environmental implications of phytolith-occluded trac ...
DOI:
10.1016/j.envpol.2021.118645

22. Accumulation of cadmium in potential hyperaccumulators Chlorophytum comosum and Callisia fragrans and role of organic acids under stress conditions

Author:
Jiri Simek; Zuzana Kovalikova; Vlastimil Dohnal; Jiri Tuma
Source:
Environmental science and pollution research international 2018 v.25 no.28 pp. 28129-28139
ISSN:
0944-1344
Subject:
Callisia fragrans; Chlorophytum comosum; aerial parts; antioxidant activity; cadmium; chelation; chlorophyll; citric acid; fumaric acid; hyperaccumulators; ornamental plants; phytoaccumulation; polluted soils; roots; shoots; stolons
Abstract:
... Cadmium (Cd) accumulation, antioxidant activity (AOA), chlorophyll fluorescence (F) and organic acid distribution in Chlorophytum comosum and Callisia fragrans plants exposed to artificially added Cd (40, 160 and 320 mg kg⁻¹) were examined in pot experiment. At the highest Cd concentration, C. comosum accumulated in roots and the aboveground parts up to 1331 and 1054 mg Cd kg⁻¹ DW, and C. fragrans ...
DOI:
10.1007/s11356-018-2831-3

23. Accumulation of phenolic compounds in in vitro cultures and wild plants of Lavandula viridis L’Hér and their antioxidant and anti-cholinesterase potential

Author:
Patrícia Costa; Sandra Gonçalves; Patrícia Valentão; Paula B. Andrade; Anabela Romano
Source:
Food and chemical toxicology 2013 v.57 pp. 69-74
ISSN:
0278-6915
Subject:
Lavandula viridis; acetylcholinesterase; antioxidants; brain; chelation; ethanol; free radicals; high performance liquid chromatography; iron; lipid peroxidation; luteolin; metabolites; mice; oxygen radical absorbance capacity; rosmarinic acid; toxicology; wild plants
Abstract:
... In this study, we evaluated the phenolic profile, antioxidant and anti-cholinesterase potential of different extracts from wild plants and in vitro cultures of Lavandula viridis L’Hér. The HPLC–DAD analysis allowed the identification and quantification of 3-O-caffeoylquinic, 4-O-caffeoylquinic, 5-O-caffeoylquinic and rosmarinic acids, and luteolin and pinocembrin. Water/ethanol extract from in vit ...
DOI:
10.1016/j.fct.2013.03.006

24. Accumulation, translocation, and assessment of heavy metals in the soil-rice systems near a mine-impacted region

Author:
Fan Du; Zhaoguang Yang; Peng Liu; Lin Wang
Source:
Environmental science and pollution research international 2018 v.25 no.32 pp. 32221-32230
ISSN:
0944-1344
Subject:
adsorption; adverse effects; arsenic; barium; bioaccumulation factor; cadmium; chelation; chromium; chronic exposure; cobalt; copper; heavy metals; iron; lead; manganese; nickel; paddy soils; rhizosphere; rice; risk; roots; straw; stress tolerance; zinc; China
Abstract:
... Paddy rice is considered as a main source for human exposure to heavy metal contamination due to its efficient accumulation of heavy metals especially when cultivated in contaminated fields. In the current study, rice grains, straws, roots, and rhizosphere paddy soils were collected from Changsha, a non-ferrous mine-impacted area in China. Heavy metals including Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, ...
DOI:
10.1007/s11356-018-3184-7

25. Acid Mine Drainage Remediation: Aluminum Chelation Using Functional Graphenic Materials

Author:
Michelle M. Karpinsky; Anne M. Arnold; Jaejun Lee; Genell Jasper; Michael R. Bockstaller; Stefanie A. Sydlik; Edward P. Zovinka
Source:
ACS applied materials & interfaces 2020 v.12 no.29 pp. 32642-32648
ISSN:
1944-8252
Subject:
Escherichia coli; acid mine drainage; aluminum; chelation; freshwater ecosystems; human health; ions; iron; pollutants; pollution; remediation; surface water; viability
Abstract:
... Acid mine drainage (AMD) is a pervasive source of metal pollution that severely impacts freshwater ecosystems and has a direct impact on human health. Conventional active and passive methods work very well for removing iron in AMD remediation, which is typically the highest metallic impurity. However, conventional passive remediation fails to remove all aluminum, which has severe ecological implic ...
DOI:
10.1021/acsami.0c06958

26. Acid-Enabled Palladium-Catalyzed β-C(sp³)–H Functionalization of Weinreb Amides

Author:
Liming Yang; Henan Xie; Guanghui An; Guangming Li
Source:
Journal of organic chemistry 2021 v.86 no.11 pp. 7872-7880
ISSN:
1520-6904
Subject:
Lewis acids; amides; arylation; catalysts; chelation; ligands; organic chemistry; palladium; sulfonic acids
Abstract:
... Pd-catalyzed modification of C–H bonds via chelation with weakly coordinating groups normally requires a transient directing group or presynthesized nitrogen-based strong coordinating ligands. Herein, we report Pd(II)-catalyzed C(sp³)–H arylation and alkenylation of Weinreb amides. A commercially available, inexpensive sulfonic acid was employed to enhance the coordination of the catalyst with wea ...
DOI:
10.1021/acs.joc.1c00781

27. Acidity of the Amidoxime Functional Group in Aqueous Solution: A Combined Experimental and Computational Study

Author:
Mehio Nada; Lashely Mark A.; Nugent Joseph W.; Tucker Lyndsay; Correia Bruna; Do-Thanh Chi-Linh; Dai Sheng; Hancock Robert D.; Bryantsev Vyacheslav S.
Source:
Journal of physical chemistry 2015 v.119 no.8 pp. 3567-3576
ISSN:
1520-5207
Subject:
acidity; adsorbents; aqueous solutions; chelation; keto acids; ligands; mining; models; physical chemistry; prediction; screening; seawater; solvents; spectroscopy; uranium
Abstract:
... Poly(acrylamidoxime) adsorbents are often invoked in discussions of mining uranium from seawater. While the amidoxime–uranyl chelation mode has been established, a number of essential binding constants remain unclear. This is largely due to the wide range of conflicting pKₐ values that have been reported for the amidoxime functional group. To resolve this existing controversy we investigated the p ...
DOI:
10.1021/jp512778x

28. Acid–base equilibria and coordination chemistry of the 5,10,15,20-tetraalkyl-porphyrins: implications for metalloporphyrin synthesis

Author:
Dao Tkhe Nam; Yulia B. Ivanova; Svetlana G. Puhovskaya; Mikalai M. Kruk; Sergei A. Syrbu
Source:
RSC advances 2015 v.5 no.33 pp. 26125-26131
ISSN:
2046-2069
Subject:
acetonitrile; acidity; chelation; coordination compounds; copper; deprotonation; metal ions; porphyrins; protonation; zinc
Abstract:
... A spectrophotometric study of the acid–base equilibria and complexation with metal ions has been carried out for 5,10,15,20-tetrakis(trifluoromethyl)porphine and 5,10,15,20-tetrakis(iso-buthyl)porphine in acetonitrile solutions. Protonation and deprotonation of these porphyrins was found to be stepwise with sequential formation of mono- and doubly protonated/deprotonated species. The overall basic ...
DOI:
10.1039/c5ra01323b

29. Activated carbon cloth filled pipette tip for solid phase extraction of nickel(II), lead(II), cadmium(II), copper(II) and cobalt(II) as 1,3,4-thiadiazole-2,5-dithiol chelates for ultra-trace detection by FAAS

Author:
Mohamed A. Habila; Zeid A. ALOthman; Erkan Yilmaz; Mustafa Soylak
Source:
International journal of environmental analytical chemistry 2018 v.98 no.2 pp. 171-181
ISSN:
1029-0397
Subject:
activated carbon; atomic absorption spectrometry; cadmium; chelates; chelation; cobalt; copper; detection limit; lead; nickel; nitric acid; solid phase extraction
Abstract:
... A solid phase extraction method is established for preconcentration of nickel, lead, cadmium, copper and cobalt using pipette tip solid phase extraction. The presented process was dependent on chelation of analytes with 1,3,4-thiadiazole-2,5-dithiol, then allowing the solution to flow through an activated carbon cloth packed pipette tip. The adsorbed metal chelates on the surface of activated carb ...
DOI:
10.1080/03067319.2018.1430794

30. Activation of AMP-activated protein kinase by human EGF receptor 2/EGF receptor tyrosine kinase inhibitor protects cardiac cells

Author:
Spector, Neil L.; Yarden, Yosef; Smith, Bradley; Lyass, Ljuba; Trusk, Patricia; Pry, Karen; Hill, Jason E.; Xia, Wenle; Seger, Rony; Bacus, Sarah S.
Source:
Proceedings of the National Academy of Sciences of the United States of America 2007 v.104 no.25 pp. 10607-10612
ISSN:
0027-8424
Subject:
AMP-activated protein kinase; anthracyclines; apoptosis; beta oxidation; calcium; cardiomyocytes; cardiomyopathy; chelation; cytokines; drug therapy; epidermal growth factor receptors; humans; ischemia; monoclonal antibodies; patients; risk; rodents; stress response; California
Abstract:
... The human EGF receptor (HER) 2 receptor tyrosine kinase is a survival factor for human cardiomyocytes, and its inhibition may explain the increased incidence of cardiomyopathy associated with the anti-HER2 monoclonal antibody trastuzumab (Genentech, South San Francisco, CA), particularly in patients with prior exposure to cardiotoxic chemotherapies e.g., anthracyclines. Here, we show that GW2974 ( ...
DOI:
10.1073/pnas.0701286104
PubMed:
17556544
PubMed Central:
PMC1965560

31. Activation of Aryl Halides at Gold(I): Practical Synthesis of (P,C) Cyclometalated Gold(III) Complexes

Author:
Guenther Johannes; Mallet-Ladeira Sonia; Estevez Laura; Miqueu Karinne; Amgoune Abderrahmane; Bourissou Didier
Source:
Journal of the American Chemical Society 2014 v.136 no.5 pp. 1778-1781
ISSN:
1520-5126
Subject:
bromine; chelation; gold; halides; iodine; nuclear magnetic resonance spectroscopy; phosphine
Abstract:
... Taking advantage of phosphine chelation, direct evidence for oxidative addition of Cₛₚ₂–X bonds (X = I, Br) to a single gold atom is reported. NMR studies and DFT calculations provide insight into this unprecedented transformation, which gives straightforward access to stable (P,C) cyclometalated gold(III) complexes. ...
DOI:
10.1021/ja412432k

32. Activation of complement by monoclonal antibodies that target cell-associated β2-microglobulin: Implications for cancer immunotherapy

Author:
Michael J. Pokrass; Monica F. Liu; Margaret A. Lindorfer; Ronald P. Taylor
Source:
Molecular Immunology 2013 v.56 pp. 549-560
ISSN:
0161-5890
Subject:
HLA antigens; adverse effects; apoptosis; chelation; complement; cytotoxicity; enzyme-linked immunosorbent assay; human cell lines; humans; immunoglobulin G; immunotherapy; mice; monoclonal antibodies; neoplasm cells; signal transduction; stoichiometry
Abstract:
... β2-Microglobulin (β2M), the light chain of the class I major histocompatibilty complex (MHC-I), is a promising tumor target for monoclonal antibodies (mAbs) in cancer immunotherapy. Several reports indicate that chelation of cell-associated β2M by specific mouse mAbs promotes tumor cell destruction by inducing apoptosis or other cytotoxic signaling pathways. Human mAbs employed in cancer therapy a ...
DOI:
10.1016/j.molimm.2013.05.242

33. Acute Administration of Bioavailable Curcumin Alongside Ferrous Sulphate Supplements Does Not Impair Iron Absorption in Healthy Adults in a Randomised Trial

Author:
Helena Tiekou Lorinczova; Gulshanara Begum; Derek Renshaw; Mohammed Gulrez Zariwala
Source:
Nutrients 2021 v.13 no.7 pp. -
ISSN:
2072-6643
Subject:
adverse effects; antioxidants; bioavailability; blood sampling; blood serum; chelation; compliance; cost effectiveness; curcumin; ferrous sulfate; hemoglobin; inflammation; iron; iron absorption; placebos; transferrin; transportation
Abstract:
... Ferrous sulphate (FS) is a cost effective, readily available iron supplement for iron deficiency (ID). The pro-oxidant effect of oral ferrous iron is known to induce inflammation, causing gastric side-effects and resulting in poor compliance. Curcumin is a potent antioxidant and has also been shown to exhibit iron chelation in-vitro, although it is not established whether these effects are retaine ...
DOI:
10.3390/nu13072300

34. Acute barium poisoning in a dog after ingestion of handheld fireworks (party sparklers)

Author:
Monique K. Stanley; Kylie Kelers; Elise Boller; Manuel Boller
Source:
Journal of veterinary emergency and critical care 2019 v.29 no.2 pp. 201-207
ISSN:
1479-3261
Subject:
barium; barium nitrate; blood serum; chelation; dogs; females; fluid therapy; heart; hypokalemia; ingestion; magnesium sulfate; mass spectrometry; muscles; normal values; pH; paralysis; poisoning; potassium; potassium chloride
Abstract:
... OBJECTIVE: To report a case of acute barium poisoning in a dog subsequent to ingestion of a common handheld pyrotechnic (sparkler). CASE SUMMARY: A 5‐year‐old female neutered German Shorthaired Pointer presented with acute onset of generalized flaccid muscle paralysis and fasciculations, ptyalism, and an irregular heart rhythm. Marked hypokalemia (1.9 mmol/L [mEq/L]; reference range [3.5–5.8 mmol/ ...
DOI:
10.1111/vec.12820

35. Acute cadmium toxicity and post-stress recovery: Insights into coordinated and integrated response/recovery strategies of Anabaena sp. PCC 7120

Author:
Akanksha Srivastava; Subhankar Biswas; Sandhya Yadav; Sanjiv Kumar; Vaibhav Srivastava; Yogesh Mishra
Source:
Journal of hazardous materials 2021 v.411 pp. 124822
ISSN:
0304-3894
Subject:
Anabaena; Calvin cycle; autotrophs; cadmium; carbon dioxide; chelation; glycolysis; pentose phosphate cycle; photosystem II; plasticity; protein synthesis; proteome; toxicity
Abstract:
... Cyanobacteria, the first photoautotrophs have remarkable adaptive capabilities against most abiotic stresses, including Cd. A model cyanobacterium, Anabaena sp. PCC 7120 has been commonly used to understand cyanobacterial plasticity under different environmental stresses. However, very few studies have focused on the acute Cd toxicity. In this context, Anabaena was subjected to 100 μM Cd for 48 h ...
DOI:
10.1016/j.jhazmat.2020.124822

36. Acute toxicity in five dogs after in ingestion of a commercial snail and slug bait containing iron EDTA

Author:
Haldane, S.L.; Davis, R.M.
Source:
Australian veterinary journal 2009 v.87 no.7 pp. 284-286
ISSN:
0005-0423
Subject:
dogs; poisoning; baits; molluscicides; acute toxicity; dietary exposure; case studies; iron; chelation; EDTA (chelating agent); pain; gastroenteritis; hemorrhage

37. Acute toxicity test of a natural iron chelator and an antioxidant, extracted from Triticum aestivum Linn. (wheat grass)

Author:
Priyabrata Das; Soma Mukhopadhyay; Suvra Mandal; Abhijit Chakraborty; Amartya Pal; Nirmal Kumar Sarkar; Ashis Mukhopadhyay
Source:
Natural product research 2014 v.28 no.17 pp. 1379-1382
ISSN:
1478-6427
Subject:
Triticum aestivum; acute toxicity; adverse effects; antioxidant activity; antioxidants; behavior change; blood chemistry; body weight; chelating agents; chelation; drug formulations; grasses; guidelines; kidneys; liver; mice; mortality; oral administration; plant extracts; toxicity testing; traditional medicine; wheat
Abstract:
... Triticum aestivum (wheat grass) is widely used in traditional medicine to treat various diseases. Previously the purified compounds and crude extract of T. aestivum were established to have iron chelation potency and antioxidant activity. So it is necessary to evaluate the toxic properties of any compound isolated from plant extract to prevent any untoward side effects. The aim of this study was t ...
DOI:
10.1080/14786419.2014.901321

38. Adaptation and detoxification mechanisms of Vetiver grass (Chrysopogon zizanioides) growing on gold mine tailings

Author:
F.A. Melato; N.S. Mokgalaka; R.I. McCrindle
Source:
International journal of phytoremediation 2016 v.18 no.5 pp. 509-520
ISSN:
1549-7879
Subject:
Chrysopogon zizanioides; bioaccumulation factor; catalase; cell walls; chelation; copper; electrical conductivity; glutathione; gold; mine tailings; molecular weight; nickel; peroxidase; phenolic compounds; phytoremediation; reactive oxygen species; roots; scanning electron microscopy; shoots; soil; stomata; superoxide dismutase; thiols; toxicity; zinc
Abstract:
... Vetiver grass (Chrysopogon zizanioides) was investigated for its potential use in the rehabilitation of gold mine tailings, its ability to extract and accumulate toxic metals from the tailings and its metal tolerant strategies. Vetiver grass was grown on gold mine tailings soil, in a hothouse, and monitored for sixteen weeks. The mine tailings were highly acidic and had high electrical conductivit ...
DOI:
10.1080/15226514.2015.1115963

39. Adenosine A2A receptor-dependent proliferation of pulmonary endothelial cells is mediated through calcium mobilization, PI3-kinase and ERK1/2 pathways

Author:
Aftab Ahmad; Jerome B. Schaack; Carl W. White; Shama Ahmad
Source:
Biochemical and biophysical research communications 2013 v.434 pp. 566-571
ISSN:
0006-291X
Subject:
adenosine; agonists; calcium; chelation; endothelial cells; humans; hypoxia; phosphatidylinositol 3-kinase; phosphorylation
Abstract:
... Hypoxia and HIF-2α-dependent A2A receptor expression and activation increase proliferation of human lung microvascular endothelial cells (HLMVECs). This study was undertaken to investigate the signaling mechanisms that mediate the proliferative effects of A2A receptor. A2A receptor-mediated proliferation of HLMVECs was inhibited by intracellular calcium chelation, and by specific inhibitors of ERK ...
DOI:
10.1016/j.bbrc.2013.03.115
PubMed:
23583199
PubMed Central:
PMC4046330

40. Administration of the Oral Antibiotic Frenolicin-B Selectively Alters Copper Nutriture in Male Rats

Author:
Kossor, David C.; Han, Shenggao; Kemp, Francis W.; Slauter, Richard W.; Serota, David; Rajaskarian, Daniel; Milner, Nicholas; Davidovich, Alberto; Bogden, John D.
Source:
Journal of nutrition 2001 v.131 no.12 pp. 3247-3250
ISSN:
0022-3166
Subject:
anorexia; antibiotics; blood; calcium; cations; chelates; chelation; copper; diet; histopathology; hyperplasia; iron; kidneys; magnesium; oral administration; rats; stomach; zinc
Abstract:
... The polyketide antibiotic Frenolicin-B (FB) produces anorexia and esophageal epithelial hyperplasia (EH) in rats, findings that are characteristic of zinc deficiency. Because FB also chelates divalent cations in vitro, we conducted studies to determine whether FB modifies blood and organ concentrations of zinc and other essential metals (calcium, copper, iron and magnesium). Groups of male Sprague ...
PubMed:
11739875

41. Adsorbent synthesis of polypyrrole/TiO2 for effective fluoride removal from aqueous solution for drinking water purification: Adsorbent characterization and adsorption mechanism

Author:
Jie Chen; Chiajung Shu; Ning Wang; Jiangtao Feng; Hongyu Ma; Wei Yan
Source:
Journal of colloid and interface science 2017 v.495 pp. 44-52
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorbents; adsorption; aqueous solutions; chelation; defluoridation; drinking; drinking water; electrostatic interactions; entropy; fluorides; groundwater; heat production; models; nitrogen; pH; polymerization; scanning electron microscopy; sorption isotherms; surface area; texture; thermogravimetry; titanium dioxide; villages; zeta potential; China
Abstract:
... More than 20 countries are still suffering problems of excessive fluoride containing water, and greater than 8mg/L fluoride groundwater has been reported in some villages in China. In order to meet the challenge in the drinking water defluoridation engineering, a high efficiency and affinity defluoridation adsorbent PPy/TiO2 composite was designed and synthetized by in-situ chemical oxidative poly ...
DOI:
10.1016/j.jcis.2017.01.084

42. Adsorption Mechanism and Structure-Performance Relationship of Chromium Ions by Biochar

Author:
Menghong Li; Xiaoli Guo; Ying Wei; Aiju Liu; Jie Lu; Xiaoyin Niu; Yanfei Ma; Shuang Li; Zhenxiao Shang; Xinpeng Liu
Source:
Water, air, and soil pollution 2020 v.231 no.10 pp. 517
ISSN:
0049-6979
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adsorption; air; biochar; carbon; carbonates; chelation; chromium; coprecipitation; electrostatic interactions; ion exchange; soil pollution; titration; water
Abstract:
... In order to further explore the adsorption mechanism of chromium ion by biochar, organic components (OCs) and inorganic components (ICs) of biochar (RC) were prepared, and adsorption experiments of chromium ions by these types of carbon (RC, OC, IC) were performed. The three types of carbon were characterized before and after adsorption of chromium ions, using Fourier transform infrared spectrosco ...
DOI:
10.1007/s11270-020-04875-6

43. Adsorption and circular dichroism of tetracycline on sodium and calcium-montmorillonites

Author:
M. Eugenia Parolo; Marcelo J. Avena; Mónica C. Savini; Miria T. Baschini; Viviana Nicotra
Source:
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2013 v.417 pp. 57-64
ISSN:
0927-7757
Subject:
X-ray diffraction; active sites; adsorbents; adsorption; antibacterial properties; bioavailability; calcium; chelation; colloids; ions; montmorillonite; pH; sodium; tetracycline
Abstract:
... The interaction of tetracycline (TC) with a Na+-montmorillonite and a Ca2+-montmorillonite in aqueous media was investigated using a batch technique complemented with X-ray diffraction (XRD) and circular dichroism (CD). The adsorption of TC decreases by increasing the pH in both cases, although Ca2+-montmorillonite is a more effective adsorbent than Na+-montmorillonite in the pH range 6–8.5. In bo ...
DOI:
10.1016/j.colsurfa.2012.10.060

44. Adsorption behavior and mechanism of heavy metal ions by chicken feather protein-based semi-interpenetrating polymer networks super absorbent resin

Author:
Wenjia Kong; Qian Li; Jia Liu; Xiaodi Li; Liwei Zhao; Yuan Su; Qinyan Yue; Baoyu Gao
Source:
RSC advances 2016 v.6 no.86 pp. 83234-83243
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adsorption; aqueous solutions; chelation; chickens; chromium; copolymerization; electrostatic interactions; endothermy; heavy metals; ion exchange; kinetics; lead; metal ions; models; moieties; nickel; pH; polymers; potassium; sorption isotherms; temperature; thermodynamics
Abstract:
... A novel chicken feather protein-g-poly(potassium acrylate)/polyvinyl alcohol (CFP-g-PKA/PVA) semi-interpenetrating polymer network (semi-IPN) super absorbent resin (SAR) was synthesized by graft copolymerization for the uptake of metal ions from aqueous solution. The influences of adsorption parameters, including pH, contact time, temperature, and initial concentrations, were investigated. The ads ...
DOI:
10.1039/c6ra18180e

45. Adsorption characteristics of Ni(II) onto MA–DTPA/PVDF chelating membrane

Author:
Xiaodan Zhao; Laizhou Song; Jie Fu; Pei Tang; Feng Liu
Source:
Journal of hazardous materials 2011 v.189 no.3 pp. 732-740
ISSN:
0304-3894
Subject:
Fourier transform infrared spectroscopy; adsorption; calcium; chelation; chemical bonding; desorption; effluents; equations; heat production; ions; lactic acid; nickel; nuclear magnetic resonance spectroscopy; pH; scanning electron microscopy; sorption isotherms; temperature; wastewater
Abstract:
... The melamine-diethylenetriaminepentaacetic acid/polyvinylidene fluoride (MA–DTPA/PVDF) chelating membrane bearing polyaminecarboxylate groups was prepared for the removal of Ni(II) from wastewater effluents. The membrane was characterized by SEM, ¹³C NMR and FTIR techniques. Quantitative adsorption experiments were performed in view of pH, contact time, temperature, the presence of Ca(II) and lact ...
DOI:
10.1016/j.jhazmat.2011.03.061

46. Adsorption mechanism of alkyl hydroxamic acid onto bastnäsite: Fundamental steps toward rational collector design for rare earth elements

Author:
Anna K. Wanhala; Benjamin Doughty; Vyacheslav S. Bryantsev; Lili Wu; Shannon M. Mahurin; Santa Jansone-Popova; Michael C. Cheshire; Alexandra Navrotsky; Andrew G. Stack
Source:
Journal of colloid and interface science 2019 v.553 pp. 210-219
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; adsorption; bastnaesite; calcite; calcium carbonate; calorimetry; cations; cerium; chelation; density functional theory; enthalpy; ligands; metal ions; moieties; titration
Abstract:
... Rare earth element (REE) production is limited in part by inefficient strategies for beneficiation. Hydroxamic acid ligands are promising reagents for the selective flotation of bastnäsite [(Ce,La)FCO₃], a major REE ore mineral, but the mechanism and energetics of adsorption are not understood, interfering with the design of new, more efficient reagents. Here, the adsorption of octyl hydroxamic ac ...
DOI:
10.1016/j.jcis.2019.06.025

47. Adsorption of Ag/Au nanoparticles by ordered macro-microporous ZIF-67, and their synergistic catalysis application

Author:
Yaru Shao; Mengke Tian; Zihan Zhen; Jianan Cui; Mingshi Xiao; Bo Qi; Ting Wang; Xiaohong Hou
Source:
Journal of cleaner production 2022 v.346 pp. 131032
ISSN:
0959-6526
Subject:
adsorbents; adsorption; catalysts; catalytic activity; chelation; composite materials; human health; hydrogen bonding; ion exchange; macropores; micropores; nanogold; nanosilver; nitrogen; oxygen; p-nitrophenol; wastewater
Abstract:
... Silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) are universally used in diverse fields, but the use and treatment of various commodities will adversely affect the human health. Therefore, the recovery and immobilization of AgNPs and AuNPs from wastewater has important economic and social benefits. The ordered macro-microporous ZIF-67 single crystal (SOM-ZIF-67) was prepared by double s ...
DOI:
10.1016/j.jclepro.2022.131032

48. Adsorption of Cd(II) and Pb(II) by a novel EGTA-modified chitosan material: Kinetics and isotherms

Author:
Feiping Zhao; Eveliina Repo; Dulin Yin; Mika E.T. Sillanpää
Source:
Journal of colloid and interface science 2013 v.409 no. pp. 174-182
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; adsorbents; adsorption; aqueous solutions; cadmium; chelation; chitosan; ethylene glycol tetraacetic acid; lead; ligands; metal ions; models; pH
Abstract:
... In this study, a novel adsorbent was synthesized by functionalizing chitosan with ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA) ligands. The adsorption capability of EGTA-modified chitosan was investigated by the removal of Cd(II) and Pb(II) from aqueous solutions. The adsorption and regeneration studies were performed by batch techniques. The effects of pH, contact time ...
DOI:
10.1016/j.jcis.2013.07.062

49. Adsorption of Cr(VI) using synthetic poly(m-phenylenediamine)

Author:
Wanting Yu; Liyuan Zhang; Haiying Wang; Liyuan Chai
Source:
Journal of hazardous materials 2013 v.260 pp. 789-795
ISSN:
0304-3894
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adsorption; chelation; chromium; oxidation; pH; polymerization; wastewater treatment
Abstract:
... Poly(m-phenylenediamine) (PmPD) with different oxidation state was successfully synthesized by the improved chemically oxidative polymerization. The function of oxidation state on Cr(VI) adsorption was systematically examined through adsorption experiments. Results showed that the Cr(VI) adsorptivity of all PmPD increased with decreasing the initial pH. When the oxidation state of PmPD was dropped ...
DOI:
10.1016/j.jhazmat.2013.06.045

50. Adsorption of Cu(II) ions from aqueous solution using pyridine-2,6-dicarboxylic acid crosslinked chitosan as a green biopolymer adsorbent

Author:
Ibraheem Olayiwola Bisiriyu; Reinout Meijboom
Source:
International journal of biological macromolecules 2020 v.165 pp. 2484-2493
ISSN:
0141-8130
Subject:
adsorbents; adsorption; aqueous solutions; biopolymers; chelation; chitosan; crosslinking; enthalpy; ion exchange; ligands; pH; temperature
Abstract:
... In this study, crosslinked chitosan (CCS) has been synthesized by anchoring a bifunctional ligand, namely pyridine-2,6-dicarboxylic acid (PDC) with chitosan through ion exchange. The functionalized biopolymer has been characterized using different instrumental analyses including elemental (CHN), spectroscopic (UV–visible, NMR, powder XRD, and FTIR), thermal analyses (TGA and DSC), surface and morp ...
DOI:
10.1016/j.ijbiomac.2020.10.150