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1. 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

2. 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

3. Elucidation of chromatographic peak shifts in complex samples using a chemometrical approach

Author:
Sousa, Pedro F. M.; de Waard, Angela; Åberg, K. Magnus
Source:
Analytical and bioanalytical chemistry 2018 v.410 no.21 pp. 5229-5235
ISSN:
1618-2642
Subject:
pH,   etc   ; algorithms; chromatography; temperature;     Show all 4 Subjects
Abstract:
... Chromatographic retention time peak shifts between consecutive analyses is a well-known fact yet not fully understood. Algorithms have been developed to align peaks between runs, but with no specific studies considering the causes of peak shifts. Here, designed experiments reveal chromatographic shift patterns for a complex peptide mixture that are attributable to the temperature and pH of the mob ...
DOI:
10.1007/s00216-018-1173-9

4. Visual determination of malachite green in sea fish samples

Author:
Gavrilenko, Nataliya A.; Volgina, Tatyana N.; Pugachev, Evgeniy V.; Gavrilenko, Mikhail A.
Source:
Food chemistry 2019 v.274 pp. 242-245
ISSN:
0308-8146
Subject:
pH,   etc   ; calibration; color; ions; malachite green; marine fish; polymethylmethacrylate; temperature;     Show all 8 Subjects
Abstract:
... Polymethylmethacrylate matrix has been developed as an analytical device for visual and spectrophotometric determination of malachite green. Based on the studied effects of different pH levels, temperature, contact time and diverse ions, optimum analysis conditions have been established. For malachite green, the calibration graph was linear in the range of 0.5–30 mg·L⁻¹ in the samples with the det ...
DOI:
10.1016/j.foodchem.2018.08.139

5. Effect of ion partitioning on electrostatics of soft particles with volumetrically charged inner core coated with pH-regulated polyelectrolyte layer B Biointerfaces

Author:
Ganjizade, Ardalan; Sadeghi, Arman; Ashrafizadeh, Seyed Nezameddin
Source:
Colloids and surfaces 2018 v.170 pp. 129-135
ISSN:
0927-7765
Subject:
pH,   etc   ; colloids; hydrogen ions; moieties;     Show all 4 Subjects
Abstract:
... The effect of ion partitioning on the electrostatics of a soft particle with a volumetrically charged core and a pH-dependent polyelectrolyte layer (PEL) is numerically investigated. It is observed that, whenever the ion partitioning is noticeable, the soft layer can be fully charged in a broader range of pH. Besides, a higher number density of the PEL functional groups and a lower charge density ...
DOI:
10.1016/j.colsurfb.2018.05.053

6. Multi-Pronged Interactions Underlie Inhibition of α-Synuclein Aggregation by β-Synuclein

Author:
Williams, Jonathan K.; Yang, Xue; Atieh, Tamr B.; Olson, Michael P.; Khare, Sagar D.; Baum, Jean
Source:
Journal of molecular biology 2018 v.430 no.16 pp. 2360-2371
ISSN:
0022-2836
Subject:
pH,   etc   ; Parkinson disease; models; therapeutics;     Show all 4 Subjects
Abstract:
... The intrinsically disordered protein β-synuclein is known to inhibit the aggregation of its intrinsically disordered homolog, α-synuclein, which is implicated in Parkinson's disease. While β-synuclein itself does not form fibrils at the cytoplasmic pH 7.4, alteration of pH and other environmental perturbations are known to induce its fibrilization. However, the sequence and structural determinants ...
DOI:
10.1016/j.jmb.2018.05.024

7. A Molibdenum(VI)–Gallein–Diphenhydramine Ion Associate and Its Application to the Extraction-Photometric Determination of Diphenhydramine

Author:
Mirzaeva, Kh. A.; Gamzaeva, U. G.
Source:
Journal of analytical chemistry 2018 v.73 no.7 pp. 661-666
ISSN:
1061-9348
Subject:
pH,   etc   ; butanol; color; spectral analysis;     Show all 4 Subjects
Abstract:
... Optimum conditions for the formation and extraction of a slightly soluble ion associate of diphenhydramine with the anionic complex molibydenum–gallein were determined. The ternary complex was extracted with butanol at pH 4–7. In the presence of diphenhydramine, the color strength became stronger, which was manifested in the absorption spectra as hypsochromic and bathochromic shifts. Some physicoc ...
DOI:
10.1134/S1061934818070110

8. Delivery of Cargo with a Bioelectronic Trigger

Author:
Hemmatian, Zahra; Jalilian, Elmira; Lee, Sangeun; Strakosas, Xenofon; Khademhosseini, Ali; Almutairi, Adah; Shin, Su Ryon; Rolandi, Marco
Source:
ACS applied materials & interfaces 2018 v.10 no.26 pp. 21782-21787
ISSN:
1944-8252
Subject:
pH,   etc   ; fibroblasts; fluorescein; fluorescence; microparticles;     Show all 5 Subjects
Abstract:
... Biological systems exchange information often with chemical signals. Here, we demonstrate the chemical delivery of a fluorescent label using a bioelectronic trigger. Acid-sensitive microparticles release fluorescin diacetate upon low pH induced by a bioelectronic device. Cardiac fibroblast cells (CFs) uptake fluorescin diacetate, which transforms into fluorescein and emits a fluorescent signal. Th ...
DOI:
10.1021/acsami.8b02724

9. Macroporous-Enabled Highly Deformable Layered Hydrogels with Designed pH Response

Author:
Li, Minggan; Joung, Dehi; Hwang, Dae Kun
Source:
Langmuir 2018 v.34 no.23 pp. 6856-6860
ISSN:
1520-5827
Subject:
pH,   etc   ; deformation; hydrogels; polymerization; separation;     Show all 5 Subjects
Abstract:
... Environment-responsive hydrogel structures are of great interest in materials research and have a wide range of applications. By using a flow lithography technique, we report a one-step and high-throughput fabrication method for the synthesis of highly pH-responsive hydrogels with designed shape transformations. In this method, heterogeneous hydrogels with porous and nonporous layers are synthesiz ...
DOI:
10.1021/acs.langmuir.8b00653

10. Kinetically Controlled Lifetimes in Redox-Responsive Transient Supramolecular Hydrogels

Author:
Wojciechowski, Jonathan P.; Martin, Adam D.; Thordarson, Pall
Source:
Journal of the American Chemical Society 2018 v.140 no.8 pp. 2869-2874
ISSN:
1520-5126
Subject:
pH,   etc   ; hydrogels; kinetics; reducing agents;     Show all 4 Subjects
Abstract:
... It remains challenging to program soft materials to show dynamic, tunable time-dependent properties. In this work, we report a strategy to design transient supramolecular hydrogels based on kinetic control of competing reactions. Specifically, the pH-triggered self-assembly of a redox-active supramolecular gelator, N,N′-dibenzoyl-l-cystine (DBC) in the presence of a reducing agent, which acts to d ...
DOI:
10.1021/jacs.7b12198

11. Assembly of a self‐complementary monomer: Formation of a pH‐responsive pillar[5]arene‐based supramolecular polymer† Part A Polymer chemistry

Author:
Zhang, Zhihua; Shao, Li; Yang, Jie
Source:
Journal of polymer science 2018 v.56 no.3 pp. 261-265
ISSN:
0887-624X
Subject:
pH,   etc   ; aromatic hydrocarbons; polymerization; polymers;     Show all 4 Subjects
Abstract:
... A novel pH‐responsive supramolecular polymer driven by CH…π interactions between alkyl chain and the cavity of pillar[5]arene was efficiently constructed in water. ...
DOI:
10.1002/pola.28907

12. The raise of Brettanomyces yeast species for beer production

Author:
Serra Colomer, Marc; Funch, Birgitte; Forster, Jochen
Source:
Current opinion in biotechnology 2019 v.56 pp. 30-35
ISSN:
0958-1669
Subject:
pH,   etc   ; beers; brewing; brewing industry; ethanol; flavor; new products; odors; yeasts;     Show all 9 Subjects
Abstract:
... The adequate application of Brettanomyces species could raise a potential opportunity for the beer industry, generating new products and optimizing production processes. Several valuable properties like high ethanol yield, tolerance to low pH and production of unique flavors have brought this yeast species into the spotlight. Aroma and flavor production of Brettanomyces in beer is currently under ...
DOI:
10.1016/j.copbio.2018.07.009

13. Comparison of different K-struvite crystallization processes for simultaneous potassium and phosphate recovery from source-separated urine

Author:
Huang, Haiming; Li, Jing; Li, Bing; Zhang, Dingding; Zhao, Ning; Tang, Shoufeng
Source:
The Science of the total environment 2019 v.651 pp. 787-795
ISSN:
0048-9697
Subject:
pH,   etc   ; coprecipitation; crystallization; magnesium oxide; models; phosphates; phosphorus; potassium; sodium; stabilizers; urine;     Show all 11 Subjects
Abstract:
... Controlled K-struvite crystallization is an attractive technology to simultaneously recover phosphate and potassium from urine. This study investigated the recovery of phosphate and potassium from source-separated urine by K-struvite crystallization using different use models of low-grade MgO (LG-MgO): LG-MgO alone (model 1, M1), LG-MgO plus phosphorus acid (model 2, M2), and a pre-formed stabiliz ...
DOI:
10.1016/j.scitotenv.2018.09.232

14. Chromium(VI) removal by mechanochemically sulfidated zero valent iron and its effect on dechlorination of trichloroethene as a co-contaminant

Author:
Zou, Haowen; Hu, Erdan; Yang, Shangyuan; Gong, Li; He, Feng
Source:
The Science of the total environment 2019 v.650 pp. 419-426
ISSN:
0048-9697
Subject:
pH,   etc   ; chromium; dechlorination; dissolved oxygen; electron transfer; electrons; groundwater; groundwater contamination; hydrogen; iron; models; protons; remediation;     Show all 13 Subjects
Abstract:
... Mechanochemically sulfidated microscale zero valent iron (S-mZVIᵇᵐ) is a promising groundwater remediation material as it has been proven to be not only efficient in dechlorinating chlorinated compounds but also amenable to up-scaling. Yet, its efficiency in treating metal contaminants remains barely studied. In this study, we investigated the mechanism and efficiencies of Cr(VI) removal by S-mZVI ...
DOI:
10.1016/j.scitotenv.2018.09.003

15. Selective ionic liquid solvent bar micro-extraction for estimation of ultra-trace silver fractions in marine waters

Author:
Herce-Sesa, Belén; López-López, José A.; Moreno, Carlos
Source:
The Science of the total environment 2019 v.650 pp. 27-33
ISSN:
0048-9697
Subject:
pH,   etc   ; dissolved organic matter; ionic liquids; kerosene; microextraction; mixing; seawater; silver; Spain;     Show all 9 Subjects
Abstract:
... Ag can be found in the ocean at the ultra-trace level, mainly as AgCln⁽ⁿ⁻¹⁾⁻ and complexed by dissolved organic matter (Ag-DOM). However, methods for studying Ag speciation in marine waters are limited by the lack of extractants capable to separate organic and inorganic silver species in natural conditions of seawater samples.In this work, a two-phase solvent bar micro-extraction method using the ...
DOI:
10.1016/j.scitotenv.2018.08.438

16. A novel strategy based on in-syringe dispersive liquid-liquid microextraction for the determination of nickel in chocolate samples

Author:
Barreto, Jeferson Alves; dos Santos de Assis, Rosivan; Cassella, Ricardo Jorgensen; Lemos, Valfredo Azevedo
Source:
Talanta 2019 v.193 pp. 23-28
ISSN:
0039-9140
Subject:
pH,   etc   ; ammonium; chocolate; detection limit; glass; liquid-phase microextraction; models; nickel; reference standards; solvents;     Show all 10 Subjects
Abstract:
... In this work, a novel approach was developed to perform dispersive liquid–liquid microextraction using a rapid pressure variation to disperse the extraction solvent in an aqueous medium. A glass syringe was used to produce an environment subject to a rapid pressure difference. The element used as a model was nickel and the approach was called pressure variation in-syringe dispersive liquid-liquid ...
DOI:
10.1016/j.talanta.2018.09.082

17. Downscale fermentation for xylooligosaccharides production by recombinant Bacillus subtilis 3610

Author:
Amorim, Cláudia; Silvério, Sara C.; Gonçalves, Raquel F.S.; Pinheiro, Ana C.; Silva, Soraia; Coelho, Elisabete; Coimbra, Manuel A.; Prather, Kristala L.J.; Rodrigues, Lígia R.
Source:
Carbohydrate polymers 2019 v.205 pp. 176-183
ISSN:
0144-8617
Subject:
pH,   etc   ; Bacillus subtilis; Trichoderma reesei; fermentation; genes; polymerization; prebiotics; secretion; xylan; xylanases; xylooligosaccharides;     Show all 11 Subjects
Abstract:
... The global demand of prebiotics such as xylooligosaccharides (XOS) has been growing over the years, motivating the search for different production processes with increased efficiency. In this study, a cloned Bacillus subtilis 3610, containing the xylanase gene xyn2 of Trichoderma reesei coupled with an endogenous secretion tag, was selected for XOS production through direct fermentation of beechwo ...
DOI:
10.1016/j.carbpol.2018.09.088

18. Kinetic study of colored species formation during paracetamol removal from water in a semicontinuous ozonation contactor

Author:
Villota, N.; Lombraña, J.I.; Cruz-Alcalde, A.; Marcé, M.; Esplugas, S.
Source:
The Science of the total environment 2019 v.649 pp. 1434-1442
ISSN:
0048-9697
Subject:
pH,   etc   ; acetaminophen; aqueous solutions; byproducts; color; hydroxylation; models; oxidation; ozonation; ozone;     Show all 10 Subjects
Abstract:
... Paracetamol aqueous solutions, when ozonized, acquired a strong red coloration depending on the applied ozone dose and the initial pH of the aqueous solution. Then, this color loses intensity and turns to yellow. Color formation is favored when operating at initial pH0 = 12.0 and ozone flow-rate 4.2 mg/min. A mechanism describing color formation was proposed, being the main pathway involved an ini ...
DOI:
10.1016/j.scitotenv.2018.08.417

19. pH dependent of the waste activated sludge reduction by short-time aerobic digestion (STAD) process

Author:
Zhou, Yun; Zhang, Jiao; Zhang, Zhiqiang; Wang, Pan; Xia, Siqing
Source:
The Science of the total environment 2019 v.649 pp. 1307-1313
ISSN:
0048-9697
Subject:
pH,   etc   ; activated sludge; aerobic digestion; ammonium; biodegradation; biopolymers; microbial activity; microorganisms; phosphates;     Show all 9 Subjects
Abstract:
... The short-time aerobic digestion (STAD) process has been found to be a unique and significant technique for the stabilization of waste activated sludge (WAS), but the influences of the system pH on the STAD process was unclear. This study systematically disclosed the influences of the system pH on the STAD process of WAS. Under neutral or weak alkaline conditions, although the biodegradation rates ...
DOI:
10.1016/j.scitotenv.2018.08.411

20. How foam stability against drainage is affected by conditions of prior whey protein powder storage and dry-heating: A multidimensional experimental approach

Author:
Audebert, Alexia; Beaufils, Sylvie; Lechevalier, Valérie; Le Floch-Fouéré, Cécile; Saint-Jalmes, Arnaud; Pezennec, Stéphane
Source:
Journal of food engineering 2019 v.242 pp. 153-162
ISSN:
0260-8774
Subject:
pH,   etc   ; air; ambient temperature; dialysis; foams; freeze drying; lactose; liquids; monitoring; water activity; whey protein isolate;     Show all 11 Subjects
Abstract:
... In the present work, we investigated the effects of powder dry-heating parameters on whey protein foams stability, especially against drainage.To this aim, whey protein isolate solutions were prepared at various pH (3.5, 5.0, 6.5), with or without a prior dialysis step to reduce the lactose content, freeze-dried, adjusted to various levels (0.12, 0.23, 0.52) of powder water activity aw and dry-hea ...
DOI:
10.1016/j.jfoodeng.2018.08.029