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1. Study on quantitative structure-biodegradability relationships of amine collectors by GFA-ANN method

Author:
Wang, Xinyang; Liu, Wengang; Duan, Hao; Fang, Ping; Zhang, Naixu; Zhou, Xiaotong
Source:
Journal of hazardous materials 2021 v.415 pp. 125628
ISSN:
0304-3894
Subject:
quaternary ammonium compounds,   etc   ; algorithms; biodegradability; biodegradation; energy; neural networks; nitrogen;     Show all 7 Subjects
Abstract:
... In this study, the biodegradability of 17 amine collectors, categorized by fatty amine, quaternary ammonium compounds and oxygen-containing amine collectors, are tested with the Closed Bottle Test for 90 days, and the results indicate most amine collectors are not readily biodegradable. The oxygen-containing amine collectors have the best biodegradability due to the introduced oxygen-containing fu ...
DOI:
10.1016/j.jhazmat.2021.125628

2. Self-assembled nanoparticle-coated interfaces: Capillary pressure, shell formation and buckling

Author:
Liu, Q.; Sun, Z.; Santamarina, J. Carlos
Source:
Journal of colloid and interface science 2021 v.581 pp. 251-261
ISSN:
0021-9797
Subject:
quaternary ammonium compounds,   etc   ; droplets; nanofluids; nanoparticles; oils; porous media;     Show all 6 Subjects
Abstract:
... Particle accumulation at liquid-liquid or liquid-gas interfaces can significantly alter capillary behavior and give rise to unusual interfacial phenomena including the asymmetric macroscopic mechanical response of the interface.This study explores the accumulation of cetyltrimethylammonium bromide-modified nanoparticles at fluid interfaces and the subsequent mechanical response of nanoparticle-coa ...
DOI:
10.1016/j.jcis.2020.07.110

3. Transition metal-free coupling reactions of benzylic trimethylammonium salts with di(hetero)aryl disulfides and diselenides

Author:
Li, Fuhai; Wang, Dan; Chen, Hongyi; He, Ze; Zhou, Lihong; Zeng, Qingle
Source:
Chemical communications 2020 v.56 no.85 pp. 13029-13032
ISSN:
1364-548X
Subject:
quaternary ammonium compounds,   etc   ; disulfides; enantiomers;     Show all 3 Subjects
Abstract:
... A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethers from (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salt ...
DOI:
10.1039/d0cc05633b

4. Cationic covalent-organic framework for sulfur storage with high-performance in lithium-sulfur batteries

Author:
Wang, Shunli; Liang, Ying; Dai, Tingting; Liu, Yalin; Sui, Zhuyin; Tian, Xinlong; Chen, Qi
Source:
Journal of colloid and interface science 2021 v.591 pp. 264-272
ISSN:
0021-9797
Subject:
quaternary ammonium compounds,   etc   ; ammonium salts; cathodes; lithium; lithium batteries; porous media; sulfur;     Show all 7 Subjects
Abstract:
... Covalent organic frameworks (COFs) with pre-designed structure and customized properties have been employed as sulfur storage materials for lithium-sulfur (Li-S) batteries. In this work, a cationic mesoporous COF (COF-NI) was synthesized by grafting a quaternary ammonium salt group onto the pore channel of COFs via a one-pot three components tandem reaction strategy. The post-functionalized COFs w ...
DOI:
10.1016/j.jcis.2021.02.010

5. Dequalinium Chloride Effectively Disrupts Bacterial Vaginosis (BV) Gardnerella spp. Biofilms

Author:
Gaspar, Carlos; Rolo, Joana; Cerca, Nuno; Palmeira-de-Oliveira, Rita; Martinez-de-Oliveira, José; Palmeira-de-Oliveira, Ana
Source:
Pathogens 2021 v.10 no.3
ISSN:
2076-0817
Subject:
quaternary ammonium compounds,   etc   ; Gardnerella; ammonium compounds; biochemical pathways; biofilm; biomass; chlorides; therapeutics; vaginal mucosa;     Show all 9 Subjects
Abstract:
... Bacterial vaginosis (BV) is the most frequent vaginal infection worldwide. It is caused by the overgrowth of anaerobic vaginal pathogens such as Gardnerella spp. BV has been associated with the occurrence of dense multispecies biofilms on the vaginal mucosa. Treatment of biofilm-associated infections such as BV is challenging. In this study, we have tested the role of a quaternary ammonium compoun ...
DOI:
10.3390/pathogens10030261

6. Ketone transformation as a pathway to inherently chiral rigidified calix[4]arenes

Author:
Tlustý, Martin; Spálovská, Dita; Kohout, Michal; Eigner, Václav; Lhoták, Pavel
Source:
Chemical communications 2020 v.56 no.84 pp. 12773-12776
ISSN:
1364-548X
Subject:
quaternary ammonium compounds,   etc   ; aromatic hydrocarbons; enantiomers; titration;     Show all 4 Subjects
Abstract:
... The preparation of inherently chiral rigidified calix[4]arenes with an intact cavity is a synthetic challenge due to the complicated synthesis of the starting compounds. Here, we report on a novel strategy for bridging the upper rim of calix[4]arenes consisting in carbonyl group formation and subsequent “extension” into a two-atom bridge using corresponding rearrangement reactions (Baeyer–Villiger ...
DOI:
10.1039/d0cc05352j

7. Synthesis of dynamic imine macrocyclic supramolecular polymers via synchronized self-assembly based on dynamic covalent bonds and noncovalent interactions

Author:
He, Zhenfeng; Huo, Yufeng; Wang, Chao; Pan, Duo; Dong, Binbin; Wang, Mingli; Guo, Li; Hu, Zhuolin; Guo, Zhanhu
Source:
Chemical communications 2020 v.56 no.65 pp. 9288-9291
ISSN:
1364-548X
Subject:
quaternary ammonium compounds,   etc   ; aldehydes; chemical bonding; imines;     Show all 4 Subjects
Abstract:
... The preparation of dynamic imine macrocycles and supramolecular polymers is combined into a single step to form supramolecular polymers (SPs). 1,4-Diazabicyclo[2.2.2]octane (DABCO) derived quaternary ammonium salts induce aldehyde and amine building blocks to covalently form imine macrocycles. Multiple noncovalent interactions between hosts (i.e., imine macrocycle) and guests (i.e., DABCO) act as ...
DOI:
10.1039/d0cc02991b

8. High phosphate removal using La(OH)3 loaded chitosan based composites and mechanistic study

Author:
Zhang, Shaopeng; Zhang, Yi; Ding, Jie; Zhang, Zepeng; Gao, Chao; Halimi, Muslim; Demey, Hary; Yang, Zhen; Yang, Weiben
Source:
Journal of environmental sciences (China) 2021 v.106 pp. 105-115
ISSN:
1001-0742
Subject:
quaternary ammonium compounds,   etc   ; adsorbents; adsorption; chitosan; desorption; electrostatic interactions; eutrophication; ligands; microparticles; pH; phosphates; polymerization; surface water; China;     Show all 14 Subjects
Abstract:
... Our present study was to prepare a biomass-supported adsorbents with high adsorptive capacity and high selectivity to prevent the accelerated eutrophication in water body. To this end, different metal hydroxide (La, Zr and Fe) first was successfully loaded on chitosan microspheres. Then the quaternary ammonium group with different content was introduced into the adsorbent by polymerization. By com ...
DOI:
10.1016/j.jes.2021.01.009

9. Tolerance of Listeria monocytogenes to biocides used in food processing environments

Author:
Duze, Sanelisiwe Thinasonke; Marimani, Musa; Patel, Mrudula
Source:
Food microbiology 2021 v.97 pp. 103758
ISSN:
0740-0020
Subject:
quaternary ammonium compounds,   etc   ; Listeria monocytogenes; biocides; disinfection; food contamination; food pathogens; listeriosis; public health; selection pressure; transporters;     Show all 10 Subjects
Abstract:
... Listeria monocytogenes is a foodborne pathogen that causes a life-threatening disease in humans known as listeriosis. Contamination of food during processing is the main route of transmission of Listeria monocytogenes. Therefore, biocides play a crucial role in food processing environments as they act as the first line of defense in the prevention and control of L. monocytogenes. Residues of bioci ...
DOI:
10.1016/j.fm.2021.103758

10. Cucurbit[7]uril as a matrix solid-phase dispersion for the extraction of quaternary ammonium pesticides from vegetables and their determination using HPLC–UV

Author:
Ran, Jinfeng; Zhang, Lingxue; Yao, Jianmei; Wang, Shasha; Liang, Ping; Dong, Nan
Source:
Food chemistry 2021 v.350 pp. 129236
ISSN:
0308-8146
Subject:
quaternary ammonium compounds,   etc   ; Cucurbitaceae; adsorption; detection; dispersants; food chemistry; high performance liquid chromatography; hydrophobicity; repeatability; solid phase extraction; sorbents; vegetables;     Show all 12 Subjects
Abstract:
... Cucurbit[7]uril (Q[7]) was first used as a dispersant sorbent material in a matrix solid-phase dispersion for the simultaneous extraction of four quaternary ammonium pesticides from vegetables before analysis using high-performance liquid chromatography with UV detection. Q[7] exhibited a better selectivity and adsorption capability for these compounds, which is due to its ability to bind selectiv ...
DOI:
10.1016/j.foodchem.2021.129236

11. The alkaline stability and fuel cell performance of poly(N-spirocyclic quaternary ammonium) ionenes as anion exchange membrane

Author:
Qiao, Xiaoqin; Wang, Xin; Liu, Shibing; Shen, Yinghua; Li, Nanwen
Source:
Journal of membrane science 2021 v.630 pp. 119325
ISSN:
0376-7388
Subject:
quaternary ammonium compounds,   etc   ; anion-exchange membranes; biphenyl; degradation; density; durability; fuel cells; molecular weight; naphthalene; polymers; temperature; water solubility;     Show all 12 Subjects
Abstract:
... A series of polymer based on spirocyclic quaternary ammonium (QA) cations having 5-/6- and 6-/6- membered rings were designed and prepared from tetrakis(bromomethyl) monomers to investigate the alkaline and fuel cell stability of spirocyclic ionenes. The alkaline stability testing of model compounds and DFT calculations showed that the spirocyclic QA having 5-/6-membered rings based on phenyl and ...
DOI:
10.1016/j.memsci.2021.119325

12. Underwater suspended bifunctionalized polyethyleneimine-based sponge for selective removal of anionic pollutants from aqueous solution

Author:
Ahmad, Zia; Li, Yun; Huang, Chaonan; Gou, Xiaoyi; Fan, Yun; Chen, Jiping
Source:
Journal of hazardous materials 2021 v.412 pp. 125284
ISSN:
0304-3894
Subject:
quaternary ammonium compounds,   etc   ; adsorption; ammonium; anion exchange; aqueous solutions; chlorides; chromium; diclofenac; heavy metals; hydrophilicity; hydrophobicity; methyl orange; water pollution;     Show all 13 Subjects
Abstract:
... Highly selective and efficient removal of ionic pollutants, including ionic organic compounds and heavy metal ions from water, is still a huge challenge due to the complex nature of polluted water. To meet this challenge, we presented the synthesis of bifunctionalized polyethyleneimine-based sponges through cryo-polymerization via BDDE as the crosslinker followed by bifunctional modification with ...
DOI:
10.1016/j.jhazmat.2021.125284

13. Effect of ionic liquids on the fluorescence properties and aggregation of superfolder green fluorescence protein

Author:
Han, Qi; Ryan, Timothy M.; Rosado, Carlos J.; Drummond, Calum J.; Greaves, Tamar L.
Source:
Journal of colloid and interface science 2021 v.591 pp. 96-105
ISSN:
0021-9797
Subject:
quaternary ammonium compounds,   etc   ; fluorescence; fluorescence emission spectroscopy; gel chromatography; glucose; glycerol; green fluorescent protein; nitrates; small-angle X-ray scattering;     Show all 9 Subjects
Abstract:
... Proteins generally tend to aggregate with less desirable properties in numerous solvents, which is one of the major challenges in the development of solvents for functional proteins. This work aims to utilize fluorescence spectroscopy and small angle X-ray scattering (SAXS) to understand the effects of ionic liquids (ILs) on the fluorescence and aggregation behavior of superfolder green fluorescen ...
DOI:
10.1016/j.jcis.2021.02.002

14. Adsorption of Indigo Carmine dye onto the surface-modified adsorbent prepared from municipal waste and simulation using deep neural network

Author:
Ahmad, Muhammad Bilal; Soomro, Umama; Muqeet, Muhammad; Ahmed, Zubair
Source:
Journal of hazardous materials 2021 v.408 pp. 124433
ISSN:
0304-3894
Subject:
quaternary ammonium compounds,   etc   ; adsorbents; adsorption; cationization; chlorides; corn stover; dyes; endothermy; equations; indigo carmine; models; paper; thermodynamics; wastes; yard wastes;     Show all 15 Subjects
Abstract:
... A new adsorbent was prepared from municipal wastes (a mixture of Corn Stover, Paper Waste, and Yard Waste) by cationization with 3 ̶ Chloro ̶ 2 ̶ Hydroxypropyl Trimethylammonium Chloride. The FTIR spectrum confirmed the quaternary ammonium group's presence on the adsorbent surface (1450 cm⁻¹). The maximum adsorption capacity (148 mg/g) was higher than the earlier reported values. Liu isotherm desc ...
DOI:
10.1016/j.jhazmat.2020.124433

15. Highly stable electron-withdrawing C[dbnd]O link-free backbone with branched cationic side chain as anion exchange membrane

Author:
Zhang, Fan; Li, Tiantian; Chen, Wanting; Wu, Xuemei; Yan, Xiaoming; Xiao, Wu; Zhang, Yang; Wang, Xiaozhou; He, Gaohong
Source:
Journal of membrane science 2021 v.624 pp. 119052
ISSN:
0376-7388
Subject:
quaternary ammonium compounds,   etc   ; anion-exchange membranes; carbon; degradation; density; density functional theory; electrolytes; energy; exhibitions; fuel cells; height; polymers; separation;     Show all 13 Subjects
Abstract:
... To break the alkaline stability limitation of aryl-ether cleavage in anion exchange membranes (AEMs), novel electron-withdrawing CO link-free polymer backbone with spacer-tunable branched ionic side-chain is synthesized via the Leuckart-Menshutkin route. Density functional theory studies show that replacing CO links in conventional poly(aryl ether ketone)s (PAEKs) with electron-donating C–NH₂ grou ...
DOI:
10.1016/j.memsci.2021.119052

16. Novel quaternary ammonium compounds derived from aromatic and cyclic amino acids: Synthesis, physicochemical studies and biological evaluation

Author:
Joondan, Nausheen; Caumul, Prakashanand; Jackson, Graham; Jhaumeer Laulloo, Sabina
Source:
Chemistry and physics of lipids 2021 v.235 pp. 105051
ISSN:
0009-3084
Subject:
quaternary ammonium compounds,   etc   ; anionic surfactants; antibacterial properties; biological assessment; cytotoxicity; dipeptides; mammals; membrane permeability; micelles; sodium; sodium dodecyl sulfate;     Show all 11 Subjects
Abstract:
... Novel quaternary ammonium surfactants (QUATs) derived from phenylalaninyl-proline dipeptide with chain length C₁₂ and C₁₄ were synthesised as potential active ingredients to be used in body cleansing formulations. The physicochemical properties and biological activities of the QUATs were determined in both single and in mixed surfactant system with either the conventional anionic surfactant sodium ...
DOI:
10.1016/j.chemphyslip.2021.105051

17. Exposure to Quaternary Ammonium Compounds Selects Resistance to Ciprofloxacin in Listeria monocytogenes

Author:
Guérin, Alizée; Bridier, Arnaud; Le Grandois, Patricia; Sévellec, Yann; Palma, Federica; Félix, Benjamin; LISTADAPT Study Group,; Roussel, Sophie; Soumet, Christophe
Source:
Pathogens 2021 v.10 no.2
ISSN:
2076-0817
Subject:
quaternary ammonium compounds,   etc   ; Listeria monocytogenes; ammonium; antibiotic resistance; antibiotics; biocides; ciprofloxacin; farm to fork; medicine; peracetic acid; selection pressure;     Show all 11 Subjects
Abstract:
... In this contribution, the antimicrobial susceptibility toward 11 antibiotics and four biocides of a panel of 205 Listeria monocytogenes (Lm) strains isolated from different ecological niches (i.e., food, animals and natural environment) was evaluated. The impact of exposure to biocides on the antibiotic susceptibilities of Lm was also investigated. Lm strains isolated from food exhibited overall a ...
DOI:
10.3390/pathogens10020220

18. Antifouling and antibacterial behavior of membranes containing quaternary ammonium and zwitterionic polymers

Author:
Zhu, Ming-Ming; Fang, Yu; Chen, Yan-Chen; Lei, Yu-Qing; Fang, Li-Feng; Zhu, Bao-Ku; Matsuyama, Hideto
Source:
Journal of colloid and interface science 2021 v.584 pp. 225-235
ISSN:
0021-9797
Subject:
quaternary ammonium compounds,   etc   ; Escherichia coli; adhesion; antibacterial properties; bacterial adhesion; fluorides; hydrophilicity; isoelectric point; polymerization; styrene; ultrafiltration; water pollution; zwitterions;     Show all 13 Subjects
Abstract:
... To overcome the organic-/bio- fouling of the membrane, a dual-functional ultrafiltration membrane containing quaternary ammonium and zwitterionic polymers via quaternization and surface radical polymerization was designed, and its antifouling and antibacterial behavior was studied. In this work, poly(vinylidene fluoride)/poly(methyl methacrylate-co-dimethylamino-2-ethyl methacrylate) (PVDF/P(MMA-c ...
DOI:
10.1016/j.jcis.2020.09.041

19. Investigations into the structure–activity relationship in gemini QACs based on biphenyl and oxydiphenyl linker

Author:
Vereshchagin, Anatoly N.; Frolov, Nikita A.; Konyuhova, Valeria Yu; Kapelistaya, Ekaterina A.; Hansford, Karl A.; Egorov, Mikhail P.
Source:
RSC advances 2021 v.11 no.6 pp. 3429-3438
ISSN:
2046-2069
Subject:
quaternary ammonium compounds,   etc   ; antibacterial properties; antifungal properties; benzalkonium chloride; biphenyl; cetylpyridinium chloride; chlorhexidine; methicillin-resistant Staphylococcus aureus; structure-activity relationships;     Show all 9 Subjects
Abstract:
... Eighteen novel gemini quaternary ammonium compounds were synthesized to examine the effect of linker nature, aliphatic chain length and their relative position on antibacterial and antifungal activity. The synthesized compounds showed strong bacteriostatic activity against a panel of both Gram-positive and Gram-negative bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and two ...
DOI:
10.1039/d0ra08900a

20. Application of artificial neural networks to prediction of new substances with antimicrobial activity against Escherichia coli

Author:
Badura, A.; Krysiński, J.; Nowaczyk, A.; Buciński, A.
Source:
Journal of applied microbiology 2021 v.130 no.1 pp. 40-49
ISSN:
1364-5072
Subject:
quaternary ammonium compounds,   etc   ; Escherichia coli; antimicrobial properties; chemistry; food safety; imidazole; labor; microbial growth; minimum inhibitory concentration; prediction; regression analysis;     Show all 11 Subjects
Abstract:
... AIMS: This article presents models of artificial neural networks (ANN) employed to predict the biological activity of chemical compounds based of their structure. Regression and classification models were designed to determine antimicrobial properties of quaternary ammonium salts against Escherichia coli strain. METHODS AND RESULTS: The minimum inhibitory concentration microbial growth E. coli was ...
DOI:
10.1111/jam.14763