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1. 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

2. 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

3. 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

4. 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

5. 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

6. Chitosan as a capping agent: Insights on the stabilization of gold nanoparticles

Author:
Franconetti, Antonio; Carnerero, Jose M.; Prado-Gotor, Rafael; Cabrera-Escribano, Francisca; Jaime, Carlos
Source:
Carbohydrate polymers 2019 v.207 pp. 806-814
ISSN:
0144-8617
Subject:
pH,   etc   ; chitosan; models; molecular dynamics; nanogold; nanoparticles;     Show all 6 Subjects
Abstract:
... A theoretical method based on Dissipative Particle Dynamics (DPD) was applied for the study of the interaction between coarse-grained models of chitosan and gold nanoparticles. These models were used to understand the role of chitosan in the stabilization of gold nanoparticles (5 and 7 nm). In addition, this stabilization was also supported by synthesized and characterized chitosan-gold nanopartic ...
DOI:
10.1016/j.carbpol.2018.12.046

7. Ion transport in a pH-regulated conical nanopore filled with a power-law fluid

Author:
Hsu, Jyh-Ping; Chu, Yu-You; Lin, Chih-Yuan; Tseng, Shiojenn
Source:
Journal of colloid and interface science 2019 v.537 pp. 358-365
ISSN:
0021-9797
Subject:
pH,   etc   ; isoelectric point; nanopores; salt concentration; viscosity;     Show all 5 Subjects
Abstract:
... Extending previous electrokinetic analyses based on a Newtonian fluid to power-law fluids, we investigate the behaviors of the ion current rectification (ICR) and the ion selectivity S of a conical nanopore having a pH-regulated surface. The bulk salt concentration Cbulk, the solution pH, and the power-law index n are examined in detail for their influences on these behaviors. We show that the ICR ...
DOI:
10.1016/j.jcis.2018.11.020

8. Lead and copper release from full and partially replaced harvested lead service lines: Impact of stagnation time prior to sampling and water quality

Author:
Doré, Evelyne; Deshommes, Elise; Laroche, Laurent; Nour, Shokoufeh; Prévost, Michèle
Source:
Water research 2019 v.150 pp. 380-391
ISSN:
0043-1354
Subject:
pH,   etc   ; copper; lead; protocols; water quality;     Show all 5 Subjects
Abstract:
... Partial lead service line replacement (PLSLR) results in the addition of a new galvanic connection and can increase lead concentrations at the tap. Focus has been given to minimizing lead release after PLSLR, but little information is available on the impact of lead remedial actions on copper concentrations, especially before passivation occurs. The impact of water quality (decreased chloride-to-s ...
DOI:
10.1016/j.watres.2018.11.076

9. π-π stacking interaction is a key factor for the stability of GH11 xylanases at low pH

Author:
Ge, Hui-Hua; Qiu, Yue; Yi, Zhi-Wei; Zeng, Run-Ying; Zhang, Guang-Ya
Source:
International journal of biological macromolecules 2019 v.124 pp. 895-902
ISSN:
0141-8130
Subject:
pH,   etc   ; amino acids; engineering; equations; mutation; xylanases;     Show all 6 Subjects
Abstract:
... Acidic xylanases possess the unique features necessary for the tolerance of acidic environments, which may have great potentials for industrial purposes. However, factors controlling the pH-dependent stability of xylanases are only partially known. Here we proposed a residue interaction networks based method to analyze the differences of residue interactions between 6 pairs of experimentally verif ...
DOI:
10.1016/j.ijbiomac.2018.11.282

10. Boronic acid derivatized lanthanide–polyoxometalates with novel B–OH–Ln and B–O–Nb bridges

Author:
Li, Shujun; Zhao, Yue; Qi, Huihui; Zhou, Yanfang; Liu, Shuxia; Ma, Xiaoming; Zhang, Jie; Chen, Xuenian
Source:
Chemical communications 2019 v.55 no.17 pp. 2525-2528
ISSN:
1364-548X
Subject:
pH,   etc   ; boronic acids; chemical reactions; ligands;     Show all 4 Subjects
Abstract:
... Three new boronic acid derivatized lanthanide–polyoxometalates (BA-Ln–POMs) were synthesized, in which boronic acids served as bi- or tri-dentate ligands and exhibited interesting coordination ability towards POMs and Lnᴵᴵᴵ. The pH was found to be crucial in controlling the coordination modes of boronic acid and the formation of B–O–Ln and B–O–Nb bridges. Compared with the boronic acid-free Ln–POM ...
DOI:
10.1039/c8cc09872g

11. Ruggedness in the Free Energy Landscape Dictates Misfolding of the Prion Protein

Author:
Moulick, Roumita; Goluguri, Rama Reddy; Udgaonkar, Jayant B.
Source:
Journal of molecular biology 2019 v.431 no.4 pp. 807-824
ISSN:
0022-2836
Subject:
pH,   etc   ; Gibbs free energy; mice; prions;     Show all 4 Subjects
Abstract:
... Experimental determination of the key features of the free energy landscapes of proteins, which dictate their adeptness to fold correctly, or propensity to misfold and aggregate and which are modulated upon a change from physiological to aggregation-prone conditions, is a difficult challenge. In this study, sub-millisecond kinetic measurements of the folding and unfolding of the mouse prion protei ...
DOI:
10.1016/j.jmb.2018.12.009

12. Luminescence Lifetime Imaging of Chemical Sensors—A Comparison between Time-Domain and Frequency-Domain Based Camera Systems

Author:
Koren, Klaus; Moßhammer, Maria; Scholz, Vincent V.; Borisov, Sergey M.; Holst, Gerhard; Kühl, Michael
Source:
Analytical chemistry 2019 v.91 no.5 pp. 3233-3238
ISSN:
1520-6882
Subject:
pH,   etc   ; cameras; dyes; image analysis; luminescence; oxygen;     Show all 6 Subjects
Abstract:
... Luminescence lifetime based imaging is still the most reliable method for generating chemical images using chemical sensor technology. However, only few commercial systems are available that enable imaging lifetimes within the relevant nanosecond to microsecond range. In this technical note we compare the performance of an older time-domain (TD) based camera system with a frequency-domain (FD) bas ...
DOI:
10.1021/acs.analchem.8b05869

13. Paper-based ion-selective optodes for continuous sensing: Reversible potassium ion monitoring

Author:
Kassal, Petar; Sigurnjak, Marija; Steinberg, Ivana Murković
Source:
Talanta 2019 v.193 pp. 51-55
ISSN:
0039-9140
Subject:
pH,   etc   ; lipophilicity; monitoring; paper; potassium; reflectometry; valinomycin;     Show all 7 Subjects
Abstract:
... A simple, low-cost paper-based potassium ion-selective optode that exhibits fully reversible sensing properties is presented. A classic optode formulation consisting of valinomycin as the ionophore and a lipophilic pH indicator has been successfully transferred to a paper substrate and characterised in a flow-through cell with reflectometric optical detection. The optode exhibits high repeatabilit ...
DOI:
10.1016/j.talanta.2018.09.031

14. Study of the long-term impacts of treatments on lead release from full and partially replaced harvested lead service lines

Author:
Doré, Evelyne; Deshommes, Elise; Laroche, Laurent; Nour, Shokoufeh; Prévost, Michèle
Source:
Water research 2019 v.149 pp. 566-577
ISSN:
0043-1354
Subject:
pH,   etc   ; copper; corrosion; lead; orthophosphates; pipes; Quebec;     Show all 7 Subjects
Abstract:
... Long-term (155 weeks) Pb concentrations, following partial lead service lines replacements (PLSLR), were measured in a flow through pilot made of harvested lead service lines (LSL) from the distribution system of the City of Montreal. The present study also investigates how release of Pb from full and partial LSLs is influenced by: pipe diameter, decrease in chloride-to-sulfate mass ratio (CSMR) f ...
DOI:
10.1016/j.watres.2018.11.037

15. Redistribution of Electron Equivalents between Magnetite and Aqueous Fe²⁺ Induced by a Model Quinone Compound AQDS

Author:
Peng, Huan; Pearce, Carolyn I.; N’Diaye, Alpha T.; Zhu, Zhenli; Ni, Jinren; Rosso, Kevin M.; Liu, Juan
Source:
Environmental science & technology 2019 v.53 no.4 pp. 1863-1873
ISSN:
1520-5851
Subject:
pH,   etc   ; iron; magnetite; models; organic matter; quinones;     Show all 6 Subjects
Abstract:
... The complex interactions between magnetite and aqueous Fe²⁺ (Fe²⁺₍ₐq₎) pertain to many biogeochemical redox processes in anoxic subsurface environments. The effect of natural organic matter, abundant in these same environments, on Fe²⁺₍ₐq₎–magnetite interactions is an additional complex that remains poorly understood. We investigated the influence of a model quinone molecule anthraquinone-2,6-disu ...
DOI:
10.1021/acs.est.8b05098

16. Adhesive Gold Nanoparticles for Easy and Controlled Surface Coating

Author:
Liu, Tianchi; Yang, Fan; Wang, Xing; Liang, Jun Feng
Source:
Langmuir 2019 v.35 no.7 pp. 2728-2737
ISSN:
1520-5827
Subject:
pH,   etc   ; catechol; coatings; dopamine; nanogold; physical properties;     Show all 6 Subjects
Abstract:
... Gold nanoparticles (Au NPs) are one of the most important nanomaterials due to their unique properties and broad applications. Among these applications, decorating Au NPs on universal surfaces is highly desired. Herein, we report adhesive Au NPs functionalized by borated dopamine dithiocarbamate. Such Au NPs are nonreactive in colloidal solution but can be activated at an acidic pH to produce adhe ...
DOI:
10.1021/acs.langmuir.8b04110

17. Influence of framework and interlayer on the colloidal stability of design swelling high-charged micas

Author:
Osuna, Francisco J.; Cota, Agustín; Fernández, Mariela A.; Pavón, Esperanza; Torres Sánchez, Rosa M.; Alba, María D.
Source:
Colloids and surfaces 2019 v.561 pp. 32-38
ISSN:
0927-7757
Subject:
pH,   etc   ; cations; colloids; mica; zeta potential;     Show all 5 Subjects
Abstract:
... Stability of colloidal clay minerals dispersion of fundamental in many industrial processes. Therefore, surface charge of the synthetic swelling high-charged mica family, Na-Mica-n (n = 2 or 4, n is the total layer charge) were investigated to study its colloidal dispersion stability as a function of the framework and interlayer space composition. Na-Mica-n (n = 2 or 4) micas were synthesized and ...
DOI:
10.1016/j.colsurfa.2018.09.086

18. Process optimization of chiral extraction of 2,3-diphenylpropionic acid by experiment and simulation

Author:
Wang, Wanru; Xu, Weifeng; Dai, Guilin; Zhang, Panliang; Tang, Kewen
Source:
Process biochemistry 2019 v.76 pp. 178-186
ISSN:
1359-5113
Subject:
pH,   etc   ; enantiomers; models; separators; solvents; thermodynamics;     Show all 6 Subjects
Abstract:
... This paper reports the process optimization of chiral extraction of 2,3-diphenylpropionic acid (2,3-2-PPA) enantiomers by experiment and simulation in centrifugal contactor separators. An efficient extraction system was obtained firstly through single-stage extraction experiments and single-stage extraction model, where sulfobutylether-β-cyclodextrin (SBE-β-CD) and 1,2-dichlorethane were selected ...
DOI:
10.1016/j.procbio.2018.10.009

19. Correction: Stability of gum Arabic-gold nanoparticles in physiological simulated pHs and their selective effect on cell lines

Author:
Ribeiro de Barros, Heloise; Cardoso, Mateus Borba; Camargo de Oliveira, Carolina; Cavichiolo Franco, Célia Regina; de Lima Bellan, Daniel; Vidotti, Marcio; Riegel-Vidotti, Izabel C.
Source:
RSC advances 2018 v.8 no.71 pp. 40596
ISSN:
2046-2069
Subject:
pH,   etc   ; cell lines; nanoparticles;     Show all 3 Subjects
Abstract:
... Correction for ‘Stability of gum Arabic-gold nanoparticles in physiological simulated pHs and their selective effect on cell lines’ by Heloise Ribeiro de Barros et al., RSC Adv., 2016, 6, 9411–9420. ...
DOI:
10.1039/c8ra90090f

20. Extent of adaptation is not limited by unpredictability of the environment in laboratory populations of Escherichia coli

Author:
Karve, Shraddha M.; Bhave, Devika; Dey, Sutirth
Source:
Journal of evolutionary biology 2018 v.31 no.9 pp. 1420-1426
ISSN:
1010-061X
Subject:
pH,   etc   ; Escherichia coli; temperature;     Show all 3 Subjects
Abstract:
... Environmental variability is on the rise in different parts of the earth, and the survival of many species depends on how well they cope with these fluctuations. Our current understanding of how organisms adapt to unpredictably fluctuating environments is almost entirely based on studies that investigate fluctuations among different values of a single environmental stressor such as temperature or ...
DOI:
10.1111/jeb.13338