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1. Azobenzene-Bridged Expanded “Texas-sized” Box: A Dual-Responsive Receptor for Aryl Dianion Encapsulation

Author:
Chi, Xiaodong; Cen, Wanglai; Queenan, Jack A.; Long, Lingliang; Lynch, Vincent M.; Khashab, Niveen M.; Sessler, Jonathan L.
Source:
Journal of the American Chemical Society 2019 v.141 no.16 pp. 6468-6472
ISSN:
1520-5126
Subject:
pH,   etc   ; encapsulation; photoisomerization;     Show all 3 Subjects
Abstract:
... We report an expanded “Texas-sized” molecular box (AzoTxSB) that incorporates photoresponsive azobenzene bridging subunits and anion recognition motifs. The shape of this box can be switched through light induced E ↔ Z photoisomerization of the constituent azobenzenes. This allows various anionic substrates to be bound and released by using different forms of the box. Control can also be achieved ...
DOI:
10.1021/jacs.9b01241

2. Dramatic enhancement in pH sensitivity and signal intensity through ligand modification of a dicobalt PARACEST probe

Author:
Thorarinsdottir, Agnes E.; Harris, T. David
Source:
Chemical communications 2019 v.55 no.6 pp. 794-797
ISSN:
1364-548X
Subject:
pH,   etc   ; chemical reactions; ligands;     Show all 3 Subjects
Abstract:
... The employment of an ancillary amine-substituted bisphosphonate ligand affords a dicobalt complex able to quantitate pH with a remarkably high sensitivity of 8.8(5) pH unit⁻¹ at 37 °C through a ratiometric paramagnetic chemical exchange saturation transfer (PARACEST) approach, where the different pH dependences of amine and amide CEST peak intensities are utilized. ...
DOI:
10.1039/c8cc09520e

3. Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2016–2018)

Author:
Breadmore, Michael C; Grochocki, Wojciech; Kalsoom, Umme; Alves, Mónica N.; Phung, Sui Ching; Rokh, Masoomeh Tehrani; Cabot, Joan M.; Ghiasvand, Alireza; Li, Feng; Shallan, Aliaa I.; Keyon, Aemi S. Abdul; Alhusban, Ala A.; See, Hong Heng; Wuethrich, Alain; Dawod, Mohamed; Quirino, Joselito P
Source:
Electrophoresis 2019 v.40 no.1 pp. 17-39
ISSN:
0173-0835
Subject:
pH,   etc   ; electrochromatography; microchip technology;     Show all 3 Subjects
Abstract:
... One of the most cited limitations of capillary and microchip electrophoresis is the poor sensitivity. This review continues to update this series of biannual reviews, first published in Electrophoresis in 2007, on developments in the field of online/in‐line concentration methods in capillaries and microchips, covering the period July 2016–June 2018. It includes developments in the field of stackin ...
DOI:
10.1002/elps.201800384

4. Optimized coagulation pathway of Al13: Effect of in-situ Aggregation of Al13

Author:
Wang, Pin; Jiao, Ruyuan; Liu, Libing; Xiao, Feng; An, Guangyu; Wang, Dongsheng
Source:
Chemosphere 2019 v.230 pp. 76-83
ISSN:
0045-6535
Subject:
pH,   etc   ; aluminum; coagulation; neutralization; silica;     Show all 5 Subjects
Abstract:
... The coagulation mechanism for removing particles by Al13 has been extensively investigated for water treatments. It was widely accepted that Al13 played important roles in coagulation mainly by charge neutralization and electrostatic patch. However, the discovery of Al13 aggregates (Al13agg) in flocs indicated that the real coagulation process should be different from the previous understanding, i ...
DOI:
10.1016/j.chemosphere.2019.05.053

5. Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer solutions

Author:
Fujiwara, Masazumi; Tsukahara, Ryuta; Sera, Yoshihiko; Yukawa, Hiroshi; Baba, Yoshinobu; Shikata, Shinichi; Hashimoto, Hideki
Source:
RSC advances 2019 v.9 no.22 pp. 12606-12614
ISSN:
2046-2069
Subject:
pH,   etc   ; biosensors; monitoring; nanodiamonds; spectroscopy;     Show all 5 Subjects
Abstract:
... We report on the sensing stability of quantum nanosensors in aqueous buffer solutions for the two detection schemes of quantum decoherence spectroscopy and nanoscale thermometry. The electron spin properties of single nitrogen-vacancy (NV) centers in 25 nm-sized nanodiamonds have been characterized by observing individual nanodiamonds during a continuous pH change from 4 to 11. We have determined ...
DOI:
10.1039/c9ra02282a

6. Significant Reduction of Analysis Time with Bulk Sensors Operating in Nonequilibrium Mode

Author:
Kalinichev, Andrey V.; Pokhvishcheva, Nadezhda V.; Peshkova, Maria A.
Source:
Analytical chemistry 2019 v.91 no.8 pp. 5362-5370
ISSN:
1520-6882
Subject:
pH,   etc   ; electrolytes; lipophilicity; models; polymers;     Show all 5 Subjects
Abstract:
... The concept of reducing the analysis time with the bulk sensors operating in nonequilibrium mode is formulated theoretically and verified experimentally with ion-selective polymeric optodes. The influence of the measurement time on the optical response range, span, median, and sensitivity is calculated and demonstrated experimentally. Model aqueous samples are successfully analyzed using a nonequi ...
DOI:
10.1021/acs.analchem.9b00459

7. Versatile N-Methylaminooxy-Functionalized Polypeptides for Preparation of Neoglycoconjugates

Author:
Wollenberg, Alexander L.; Perlin, Pesach; Deming, Timothy J.
Source:
Biomacromolecules 2019 v.20 no.4 pp. 1756-1764
ISSN:
1526-4602
Subject:
pH,   etc   ; glycoproteins; hydrophobicity; moieties; polypeptides;     Show all 5 Subjects
Abstract:
... The preparation and characterization of a new set of well-defined polypeptides containing N-methylaminooxy side-chain functionality is described. These functional groups enabled the direct coupling of polypeptides with a variety of unmodified reducing saccharides in water to give neoglycopolypeptides in high yields. The use of different polypeptide scaffolds resulted in neoglycoconjugates with tun ...
DOI:
10.1021/acs.biomac.9b00138

8. A novel voltammetry offline coupled MALDI/TOF MS characterization of electrochemical reaction products and the voltammetric determination of febuxostat in human plasma

Author:
El-Yazbi, Fawzi A.; Amin, Omayma A.; Bakry, Rania; Khamis, Essam F.; El-Kimary, Eman I.; Younis, Sameh E.
Source:
Talanta 2019 v.194 pp. 542-547
ISSN:
0039-9140
Subject:
pH,   etc   ; acetates; drugs; electrochemistry; humans;     Show all 5 Subjects
Abstract:
... A simple offline coupling voltammetry-MALDI/TOF MS procedure is presented for studying electrochemical reactions. It was utilized for the characterization of the electro-reduction products of febuxostat in methanolic acetate buffer (0.1 M, pH 5). The MS analysis reveals that the carboxylic and nitrile groups are the electro-reducible groups at −0.9338 and −1.5503 V with the conversion to aldehydic ...
DOI:
10.1016/j.talanta.2018.10.087

9. Voltage-controlled ion transport and selectivity in a conical nanopore functionalized with pH-tunable polyelectrolyte brushes

Author:
Hsu, Jyh-Ping; Yang, Shu-Tuan; Lin, Chih-Yuan; Tseng, Shiojenn
Source:
Journal of colloid and interface science 2019 v.537 pp. 496-504
ISSN:
0021-9797
Subject:
pH,   etc   ; electrolytes; nanopores; salt concentration;     Show all 4 Subjects
Abstract:
... Chemically functionalized bioinspired nanopores are widely adopted to control the ionic transport for various purposes. A detailed understanding of the underlying mechanisms is not only desirable but also necessary for device design and experimental data interpretation. Here, the conductance and the ion selectivity of a conical nanopore surface modified by a polyelectrolyte (PE) layer are studied ...
DOI:
10.1016/j.jcis.2018.11.046

10. Immobilization adjusted clock reaction in the urea–urease–H⁺ reaction system

Author:
Yang, Dan; Fan, Junhe; Cao, Fengyi; Deng, Zuojun; Pojman, John A.; Ji, Lin
Source:
RSC advances 2019 v.9 no.7 pp. 3514-3519
ISSN:
2046-2069
Subject:
pH,   etc   ; enzymatic reactions; moieties; urease;     Show all 4 Subjects
Abstract:
... The bell-shaped reactivity-pH curve is the fundamental reason that the temporal programmable kinetic switch in clock reactions can be obtained in bio-competitive enzymatic reactions. In this work, urease was loaded on small resin particles through ionic binding. Experimental results reveal that the immobilization not only increased the stability of the enzyme and the reproducibility of the clock r ...
DOI:
10.1039/c8ra09244c

11. Protein oxidation during temperature-induced amyloid aggregation of beta-lactoglobulin

Author:
Keppler, Julia K.; Heyn, Timon R.; Meissner, Philipp M.; Schrader, Katrin; Schwarz, Karin
Source:
Food chemistry 2019 v.289 pp. 223-231
ISSN:
0308-8146
Subject:
pH,   etc   ; amyloid; beta-lactoglobulin; oxidation; peptides; tyrosine;     Show all 6 Subjects
Abstract:
... Although the connection between protein oxidation, amyloid aggregation and diseases such as Alzheimer’s is well known there is no information on such effects during preparation of beta-lactoglobulin fibrils. Different morphologies of amyloid aggregates of beta-lactoglobulin were prepared by incubation at pH 2 or pH 3.5 for up to 72 h. After 5 h, amyloid aggregates at pH 2 formed typical fibrils, w ...
DOI:
10.1016/j.foodchem.2019.02.114

12. Simple rolling circle amplification colorimetric assay based on pH for target DNA detection

Author:
Hamidi, Seyed Vahid; Perreault, Jonathan
Source:
Talanta 2019 v.201 pp. 419-425
ISSN:
0039-9140
Subject:
pH,   etc   ; DNA; colorimetry; equipment; polymerase chain reaction;     Show all 5 Subjects
Abstract:
... Detection and identification of DNA by PCR has opened tremendous possibilities and allows detection of minute quantities of DNA highly specifically. However, PCR remains confined to laboratory settings because of the need of thermocyclers and other analytical equipment. This led to development of isothermal amplification techniques, among which Pad Lock Probe (PLP)-based Rolling Circle Amplificati ...
DOI:
10.1016/j.talanta.2019.04.003

13. A small molecule emitting in the near infrared region with pH sensitivity for visualization mitochondria under super-resolution microscopy

Author:
Hu, Ling; Fang, Bin; Hu, Lei; Shen, Yu; Hussain, Sajid; Liu, Jiejie; Liu, Tianyan; Wang, Siyou; Zhang, Qiong; Tian, Yupeng; Tian, Xiaohe
Source:
Talanta 2019 v.199 pp. 140-146
ISSN:
0039-9140
Subject:
pH,   etc   ; image analysis; microscopy; mitochondria; salts;     Show all 5 Subjects
Abstract:
... Small molecules emitting in the NIR for tracking mitochondrial pH alteration with super-resolution are expected to play an essential role in biomedical applications. Herein, two small molecules based on pyridinium salt (P1 and P2) have been synthesized and systematically investigated. It was found that pyridinium salts P1 and P2 emitted in the NIR (about 610 nm), which could detect pH changes from ...
DOI:
10.1016/j.talanta.2019.02.042

14. Anaerobic degradation of deca-brominated diphenyl ether contaminated in products: Effect of temperature on degradation characteristics

Author:
Shi, Chen; Hu, Yong; Kobayashi, Takuro; Zhang, Nan; Kuramochi, Hidetoshi; Zhang, Zhenya; Xu, Kai-Qin
Source:
Bioresource technology 2019 v.283 pp. 28-35
ISSN:
0960-8524
Subject:
pH,   etc   ; bromine; polybrominated diphenyl ethers; temperature;     Show all 4 Subjects
Abstract:
... In this study, a 200-day deca-brominated diphenyl ether (deca-BDE) degradation activity experiment was carried out, using consumer-use curtain material as the substrate. During the degradation process, polybrominated diphenyl ether (PBDE) products with fewer bromine atoms were gradually generated by the debromination of deca-BDE. The influences of temperature, initial substrate dosing mass, and pH ...
DOI:
10.1016/j.biortech.2019.03.059

15. Insights into the effects of acidification on sewage sludge dewaterability through pH repeated adjustment

Author:
Wei, Hua; Tang, Yunong; Li, Aimin; Yang, Hu
Source:
Chemosphere 2019 v.227 pp. 269-276
ISSN:
0045-6535
Subject:
pH,   etc   ; acidification; dewatering; polymers; protonation; sewage sludge;     Show all 6 Subjects
Abstract:
... Sludge acidification is a popular and efficient pretreatment method for improving sludge dewaterability. To explore the mechanisms of sludge acidification deeply and provide a theoretical basis for practical application, sewage sludge was repeatedly treated by acidification conditioning. The sludge pH was continuously adjusted from 7.0 to 3.0, then back to 7.0, and to 3.0 again in this study. When ...
DOI:
10.1016/j.chemosphere.2019.04.020

16. Mechanistic understanding of abnormal reverse phase chromatographic behavior of basic analytes in the presence of sodium dodecyl sulfate

Author:
Socia, Adam; Liu, Yong; Abend, Andreas; Wuelfing, W. Peter
Source:
Journal of chromatography 2019 v.1595 pp. 108-116
ISSN:
0021-9673
Subject:
pH,   etc   ; chromatography; sodium dodecyl sulfate; surfactants;     Show all 4 Subjects
Abstract:
... In the process of dissolution method development for Merck proprietary compound A, a basic analyte, abnormal chromatographic behavior involving peak splitting and retention time shifting in the presence of sodium dodecyl sulfate (SDS) in the sample solution was observed. A mechanistic study was conducted and the level and type of surfactant, along with the pKa of the analyte, were determined to be ...
DOI:
10.1016/j.chroma.2019.02.044

17. Degradation of metronidazole by dielectric barrier discharge in an aqueous solution

Author:
Yang, Zhipeng; Lai, Anxing; Chen, Hangyu; Yan, Youxiang; Yang, Ye; Zhang, Weiwei; Wang, Lei
Source:
Frontiers of environmental science & engineering 2019 v.13 no.3 pp. 33
ISSN:
2095-2201
Subject:
pH,   etc   ; antibiotics; aqueous solutions; metronidazole; organic matter;     Show all 5 Subjects
Abstract:
... Degradation of metronidazole (MNZ) which is a representative and stable antibiotic by dielectric barrier discharge (DBD) in an aqueous solution has been studied. Effects of initial MNZ concentration, solution pH and coexisting organics on the degradation were investigated. The results illustrated that increasing the input power and the discharge frequency can improve the removal of MNZ. At low ini ...
DOI:
10.1007/s11783-019-1117-4

18. Controlled release studies through chitosan-based hydrogel synthesized at different polymerization stages

Author:
Md Rasib, Siti Zalifah; Md Akil, Hazizan; Khan, Abbas; Abdul Hamid, Zuratul Ain
Source:
International journal of biological macromolecules 2019 v.128 pp. 531-536
ISSN:
0141-8130
Subject:
pH,   etc   ; drugs; hydrogels; polymerization; rifampicin; temperature;     Show all 6 Subjects
Abstract:
... An earlier study showed that the behaviour of chitosan-poly(methacrylic acid‑co‑N‑isopropylacrylamide) [chitosan‑p(MAA‑co‑NIPAM)] hydrogels synthesized at different reaction times are affected with regard to their pH and temperature sensitivities. The study was continued in this paper to identify the effects of different reaction times on the degradation, efficiency of rifampicin (Rif) loading and ...
DOI:
10.1016/j.ijbiomac.2019.01.190

19. Cobalt-doped hematite thin films for electrocatalytic water oxidation in highly acidic media

Author:
Kwong, Wai Ling; Lee, Cheng Choo; Shchukarev, Andrey; Messinger, Johannes
Source:
Chemical communications 2019 v.55 no.34 pp. 5017-5020
ISSN:
1364-548X
Subject:
pH,   etc   ; catalytic activity; geometry; hematite; oxidation;     Show all 5 Subjects
Abstract:
... Earth-abundant cobalt-doped hematite thin-film electrocatalysts were explored for acidic water oxidation. The strategically doped hematite produced a stable geometric current density of 10 mA cm⁻² for up to 50 h at pH 0.3, as a result of Co-enhanced intrinsic catalytic activity and charge transport properties across the film matrix. ...
DOI:
10.1039/c9cc01369e

20. Amino-functionalized biomass-derived porous carbons with enhanced aqueous adsorption affinity and sensitivity of sulfonamide antibiotics

Author:
Wang, Yu; Jiao, Wen-Bin; Wang, Jun-Tao; Liu, Gui-Fang; Cao, Hai-Lei; Lü, Jian
Source:
Bioresource technology 2019 v.277 pp. 128-135
ISSN:
0960-8524
Subject:
pH,   etc   ; adsorption; antibiotics; carbon; remediation; sulfadiazine; wastewater;     Show all 7 Subjects
Abstract:
... In view of the increasing concerns in antibiotics contamination, advanced technologies for antibiotics removal have been receiving widespread research attention in the fields of environmental sciences. This work has developed a series of amino-functionalized porous carbon materials (NH2-BPCs), via a facile chemical modification method, which have been found efficient for the removal of sulfonamide ...
DOI:
10.1016/j.biortech.2019.01.033