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1. Design and synthesis of thymine modified phthalocyanine for Aβ protofibrils photodegradation and Aβ peptide aggregation inhibition

Author:
Qichen Zhan; Xianqing Shi; Ting Wang; Jinhui Hu; Jiahong Zhou; Lin Zhou; Shaohua Wei
Source:
Talanta 2019 v.191 pp. 27-38
ISSN:
0039-9140
Subject:
absorption; aluminum; amyloid; brain; bromides; chelation; flow cytometry; fluorescence; iron; neurotoxicity; photochemotherapy; photolysis; photosensitizing agents; reactive oxygen species; spectroscopy; tetrazolium; thymine; transmission electron microscopy; zinc
Abstract:
... The formation and accumulation of toxic amyloid beta (Aβ) protofibrils in brain is recognized as the pathological hallmark of alzheimer’s disease (AD). Recent research indicated that photodynamic therapy (PDT) has potential to treat AD because reactive oxygen species (ROS) generated by photosensitizers (PS) could degrades Aβ protofibrils. Al³⁺ and Fe³⁺ were found at markedly high levels on and aro ...
DOI:
10.1016/j.talanta.2018.08.037

2. Highly efficient adsorptive removal of uranyl ions by a novel graphene oxide reduced by adenosine 5′-monophosphate (RGO-AMP)

Author:
Raj Kumar Dutta; Md. Azfar Shaida; Kirti Singla; Dipika Das
Source:
Journal of materials chemistry A 2019 v.7 no.2 pp. 664-678
ISSN:
2050-7496
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray photoelectron spectroscopy; adenosine monophosphate; adsorbents; adsorption; aluminum; cadmium; carboxylic acids; cations; chelation; chemical reduction; cobalt; copper; endothermy; energy-dispersive X-ray analysis; graphene oxide; iron; kinetics; lead; manganese; mercury; nickel; nitrogen; oxygen; pH; phosphates; scanning electron microscopy; sorption isotherms; surface area; thermodynamics; uranyl ions; zeta potential; zinc
Abstract:
... Graphene oxide reduced by adenosine 5′-monophosphate (RGO-AMP) has been developed as a smart nanoscale adsorbent for unprecedented high removal of uranyl ions from aqueous medium. The amine/amide and phosphate groups of AMP are grafted in the graphene oxide structure by reducing the carboxylic acid groups of GO to facilitate a stronger affinity for interaction with uranyl ions. An array of charact ...
DOI:
10.1039/c8ta09746a

3. Metal ion interactions with methyl gallate characterized by UV spectroscopic and computational methods

Author:
Liangliang Zhang; Yuchen Liu; Xinyu Hu; Yongmei Wang; Man Xu
Source:
Food chemistry 2019 v.293 pp. 66-73
ISSN:
0308-8146
Subject:
aluminum; chelation; computational methodology; copper; iron; ligands; metal ions; methyl gallate; models; pH; quantum mechanics; solvents; spectroscopy; stoichiometry; tin
Abstract:
... A simple biologically active phenolic methyl gallate (MeG) was used as a model compound to identify the nature of the complexes it formed with Al3+, Fe3+, Cu2+, and Sn2+ as analyzed by ultraviolet (UV) spectroscopic and computational methods. The results showed that, among all the metal ions studied in the present study, MeG has the highest formation constant with Al3+, and the complexation betwee ...
DOI:
10.1016/j.foodchem.2019.04.083

4. Metal-chelate sorbents based on carboxyalkylchitosans: Ciprofloxacin uptake by Cu(II) and Al(III)-chelated cryogels of N-(2-carboxyethyl)chitosan

Author:
Yuliya Privar; Dariya Shashura; Alexandr Pestov; Evgeny Modin; Artem Baklykov; Dmitry Marinin; Svetlana Bratskaya
Source:
International journal of biological macromolecules 2019 v.131 pp. 806-811
ISSN:
0141-8130
Subject:
aluminum; aqueous solutions; chelation; chitosan; ciprofloxacin; copper; crosslinking; cryogels; electrostatic interactions; iron; metal ions; pH; polymers; sorbents; sorption
Abstract:
... Here we propose a metal-chelate approach to removal of fluoroquinolones from aqueous solutions using their ability to bind strongly divalent and trivalent metal ions immobilized in a polymer matrix. Metal-affine sorbents for ciprofloxacin uptake have been fabricated via chelation of Cu(II), Al(III), and Fe(III) ions by supermacroporous cryogel of carboxyalkyl chitosan derivative (N-(2-carboxyethyl ...
DOI:
10.1016/j.ijbiomac.2019.03.122

5. Multicavity triethylenetetramine-chitosan/alginate composite beads for enhanced Cr(VI) removal

Author:
Wei Zhang; Hongyu Wang; Xiaoling Hu; Huijuan Feng; Wenqi Xiong; Wenbin Guo; Jinping Zhou; Ahmed Mosa; Yazhou Peng
Source:
Journal of cleaner production 2019 v.231 pp. 733-745
ISSN:
0959-6526
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; alginates; aluminum; aqueous solutions; batch systems; calcium; cation exchange; chelation; chitosan; chlorides; chromium; electrostatic interactions; energy-dispersive X-ray analysis; microbeads; models; nitrates; pH; scanning electron microscopy; sodium; sorption isotherms; sulfates; temperature; wastewater
Abstract:
... A novel triethylenetetramine (TEAE) modified chitosan microbeads with multicavity structure encapsulated in alginate backbone (named as HCTA) was fabricated for Cr(VI) removal from aqueous solution. Cr(VI) removal was investigated in batch and column modes. FTIR, SEM-EDS, XRD and XPS, etc. were utilized for characterization of the composites. Multiple mechanisms such as electrostatic interaction, ...
DOI:
10.1016/j.jclepro.2019.05.219

6. Random copolymerization of l‐lactide and ε‐caprolactone by aluminum alkoxide complexes supported by N2O2 bis(phenolate)‐amine ligands

Author:
Phongnarin Chumsaeng; Setsiri Haesuwannakij; Arnut Virachotikul; Khamphee Phomphrai
Source:
Journal of polymer science 2019 v.57 no.15 pp. 1635-1644
ISSN:
0887-624X
Subject:
aluminum; catalysts; chelation; composite polymers; copolymerization; differential scanning calorimetry; lactones; ligands; nuclear magnetic resonance spectroscopy; pyridines
Abstract:
... The bowl‐shaped aluminum alkoxide complexes bearing N₂O₂ bis(phenolate)‐amine ligands having different side arms as pyridine (1), dimethyl amine (2), and diethyl amine (3) were shown to be highly efficient and well behaved in the homopolymerization and copolymerization of l‐lactide (LA) and ε‐caprolactone (ε‐CL) at 100 °C. The rates of copolymerization are similar for Complexes 1–3 where nearly fu ...
DOI:
10.1002/pola.29425

7. Removal of Iron(III) and Aluminum Ions from Phosphoric Acid–Nitric Acid Solutions by S957 Chelation Resin: Kinetics, Dynamic Adsorption, and Elution

Author:
Rui Lv; Yingyuan Hu; Zehui Jia; Rui Li; Xiaochao Zhang; Jianxin Liu; Caimei Fan; Junqiang Feng; Lingyun Zhang; Zhihua Wang
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.47 pp. 21641-21648
ISSN:
1520-5045
Subject:
adsorption; aluminum; chelation; hydrochloric acid; ions; iron
Abstract:
... Removal of iron(III) and aluminum ions from phosphoric acid–nitric acid (PA-NA) solutions including their batch adsorption kinetics on the sulfonic/monophosphonic acid chelation resin (S957) and the dynamic adsorption–elution process at the different operating parameters is studied. The results reveal that Fe(III) and Al(III) ions in PA-NA solutions on S957 resin present the slow batch adsorption ...
DOI:
10.1021/acs.iecr.9b04682

8. Spent coffee grounds improve the nutritional value in elements of lettuce (Lactuca sativa L.) and are an ecological alternative to inorganic fertilizers

Author:
Ana Cervera-Mata; Miguel Navarro-Alarcón; Gabriel Delgado; Silvia Pastoriza; Javier Montilla-Gómez; Juan Llopis; Cristina Sánchez-González; José Ángel Rufián-Henares
Source:
Food chemistry 2019 v.282 pp. 1-8
ISSN:
0308-8146
Subject:
Lactuca sativa; NPK fertilizers; absorption; agricultural soils; aluminum; arsenic; cadmium; chelation; cobalt; fertilizer application; iron; lettuce; manganese; melanoidins; mineral fertilizers; nutritive value; organic production; phytomass; soil amendments; soil pH; toxic substances; vanadium; zinc
Abstract:
... The element concentration in lettuces grouped in 5 categories (baby variety, cultivated in agricultural soils with low or high percentages of spent coffee grounds-SCG, without SCG and with NPK) were measured. Lettuces cultivated in agricultural soils amended with SCG had significantly higher levels of several essential (V, Fe, Co, V, and probably Mn and Zn) and toxic elements (Al and probably As), ...
DOI:
10.1016/j.foodchem.2018.12.101

9. Tuneable design of a pulp fibre-based colorimetric sensor and its visual recognition mechanism for ppb levels of Ag+

Author:
Hongxiang Zhu; Wei Guo; Jian Wang; Hui He; Xudong Hou; Shile Zhou; Shuangfei Wang
Source:
Cellulose 2019 v.26 no.17 pp. 9149-9161
ISSN:
0969-0239
Subject:
aluminum; aqueous solutions; biomass; cadmium; calcium; cellulose; chelation; chromium; color; colorimetry; copper; detection limit; ions; lead; ligands; lysine; magnesium; manganese; mercury; potassium; pulp; schiff bases; silver; sodium; surface area; visual perception; zinc
Abstract:
... A novel biomass pulp fibre (PF)-based colorimetric sensor was prepared by grafting L-lysine (L-lys) onto the surface of PFs via a Schiff base reaction. The grafted L-lys contained two specific synergistic recognition groups (–COOH and –NH₂), which only recognize Ag⁺. The as-prepared sensor (DAPF-L-lys) showed excellent selective recognition of Ag⁺ and an obvious visual colour change from light-yel ...
DOI:
10.1007/s10570-019-02713-5

10. A new ‘turn-on’ and reversible fluorescent sensor for Al³⁺ detection and live cell imaging

Author:
JianHua Wang; LiHen Feng; JianBin Chao; Yu Wang; ShaoMin Shuang
Source:
Analytical methods 2019 v.11 no.43 pp. 5598-5606
ISSN:
1759-9679
Subject:
aluminum; chelation; fluorescence; fluorescence microscopes; fluorescence microscopy; hepatoma; image analysis; ions; isomerization; methanol; neoplasm cells; pH; spectral analysis; stoichiometry
Abstract:
... Herein, we report a new benzothiazole-based azomethine receptor L as a reversible fluorescent sensor for the selective detection of Al³⁺ in buffered aqueous methanol (20 mM HEPES, pH = 6.0, 50% (v/v) CH₃OH). The fluorescence enhancement response of L towards Al³⁺ along with a large blue shift (Δλ = ∼157 nm) may be attributed to the formation of the L–Al³⁺ complex, which results in the inhibition o ...
DOI:
10.1039/c9ay01438a

11. The possible neuroprotective effects of melatonin in aluminum chloride-induced neurotoxicity via antioxidant pathway and Nrf2 signaling apart from metal chelation

Author:
Kadry M. Sadek; Mohamed A. Lebda; Tarek K. Abouzed
Source:
Environmental science and pollution research international 2019 v.26 no.9 pp. 9174-9183
ISSN:
0944-1344
Subject:
Western blotting; aluminum; aluminum chloride; biomarkers; brain; brain damage; catalase; chelation; copper; genes; glutathione transferase; histopathology; homeostasis; iron; lipids; males; malondialdehyde; melatonin; neurodegenerative diseases; neurons; neuroprotective effect; neurotoxicity; peroxidation; protein synthesis; quantitative polymerase chain reaction; rats; superoxide dismutase; transcription (genetics); transcription factors
Abstract:
... Aluminum (Al) had well-identified adverse influences on the nervous system mainly through the creation of reactive oxygen species (ROS). Melatonin works as an antioxidant through the inhibition of ROS and attenuating peroxidation of lipids. Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) is a pivotal transcription factor which controls the transcription of antioxidant enzymes. This study was co ...
DOI:
10.1007/s11356-019-04430-9

12. A unique aluminum resistance mechanism conferred by aluminum and salicylic-acid-activated root efflux of benzoxazinoids in maize

Author:
Zunkang Zhao; Xiaofeng Gao; Ye Ke; Minmin Chang; Lu Xie; Xiaofeng Li; Minghua Gu; Jiping Liu; Xinlian Tang
Source:
Plant and soil 2019 v.437 no.1-2 pp. 273-289
ISSN:
0032-079X
Subject:
aluminum; benzoxazinoids; biosynthesis; chelation; corn; cultivars; exudation; hydroxamic acids; root growth; root tips; salicylic acid
Abstract:
... BACKGROUND AND AIMS: Although aluminum (Al) exclusion via root exudation of organic matters is a common resistance mechanism adopted by many plant species, whether root exudation of benzoxazinoids, such as hydroxamic acids (HAs), confers Al resistance remains unclear. METHODS: We performed physiological characterization for an Al-resistant maize cultivar TY and a sensitive maize cultivar ZD. RESUL ...
DOI:
10.1007/s11104-019-03971-9