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Journal articles on the topic 'Amphoteres'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Bongo, G., G. Mercier, P. Drogui Et, and J. ‐F Blais. "TRAITEMENT DE DECHETS D’ALUMINERIE CONTAMINES EN HAP PAR FLOTTATION EN PRESENCE DE SURFACTANTS AMPHOTERES." Environmental Technology 29, no. 4 (April 2008): 479–88. http://dx.doi.org/10.1080/09593330801984480.

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2

Zongshi, Li, and Zhang Zhuangyu. "Amphotere Imidazolintenside / Amphoteric Imidazoline Surfactants." Tenside Surfactants Detergents 31, no. 2 (March 1, 1994): 128–32. http://dx.doi.org/10.1515/tsd-1994-310222.

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3

Mukhametgazy, N., I. Sh Gussenov, A. V. Shakhvorostov, and S. E. Kudaibergenov. "Salt tolerant acrylamide-based quenched polyampholytes for polymer flooding." Bulletin of the Karaganda University. "Chemistry" series 100, no. 4 (December 30, 2020): 119–27. http://dx.doi.org/10.31489/2020ch4/119-127.

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In our previous papers [1, 2] we considered the behavior of linear and crosslinked polyampholytes based on fully charged anionic monomer — 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) and cationic monomer — (3-acrylamidopropyl)trimethylammonium chloride (APTAC) in aqueous-salt solutions, swelling and mechanical properties. In the present paper we report the applicability of salt tolerant amphoter-ic terpolymers composed of AMPS, APTAC and acrylamide (AAm) in enhanced oil recovery (EOR). The amphoteric terpolymers of different compositions, particularly [AAm]:[AMPS]:[APTAC] = 50:25:25; 60:20:20; 70:15:15; 80:10:10 and 90:5:5 mol.% were prepared by free-radical polymerization, identified and their viscosifying ability with respect to reservoir saline water (salinity is 163 g⋅L-1) at 60 °C was tested. It was found that due to polyampholytic nature, the AAm-AMPS-APTAC terpolymers exhibited improved viscosifying behavior at high salinity water. As a result, the appropriate salt tolerant sample [AAm]:[AMPS]:[APTAC] = 80:10:10 mol.% was selected for polymer flooding experiments. Polymer flood-ing experiments on high permeable sand pack model demonstrated that only 0.5 % oil was recovered by am-photeric terpolymer. While injection of polyampholyte solution into preliminarily water flooded core sample resulted in the increase of oil recovery up to 4.8–5 %. These results show that under certain conditions the amphoteric terpolymers have a decent oil displacement ability.

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4

Eissa, A. M. F. "Amphoteric surface active agents." Grasas y Aceites 46, no. 4-5 (October 30, 1995): 240–44. http://dx.doi.org/10.3989/gya.1995.v46.i4-5.931.

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5

Imai, Shinji, Heikki Rauvala, Jaakko Parkkinen, and Ari Rouhiainen. "Occurrence of Amphoterin (HMG1) as an Endogenous Protein of Human Platelets that Is Exported to the Cell Surface upon Platelet Activation." Thrombosis and Haemostasis 84, no. 12 (2000): 1087–94. http://dx.doi.org/10.1055/s-0037-1614175.

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SummaryAmphoterin (HMG1) is a 30-kD heparin-binding protein which is functionally associated with the outgrowth of cytoplasmic processes in developing neurones. Amphoterin has been shown to mediate adhesive and proteolytic interactions at the leading edge of motile cells. Recently it was shown that inhibition of amphoterin interactions with its cell surface receptor (RAGE) suppresses tumour growth and metastasis. In this work we have identified amphoterin polypeptide and its mRNA in human platelets. Amphoterin had a cytoplasmic localisation in resting platelets according to subcellular fractionation studies and immunogold electronmicroscopy. After platelet activation, part of amphoterin was associated with the external surface of plasma membrane. Externalisation of amphoterin during platelet activation was also detected in immunofluorescence studies. Amphoterin was detectable in human serum (0.2 ng/ml) but not in plasma. Resting platelets treated with PGI2 and forskolin bound to immobilised recombinant amphoterin independently of divalent cations. The binding induced a spicular morphology in platelets, and was effectively inhibited by heparin. Amphoterinbinding protein components on the platelet surface were not identified, but amphoterin bound to phosphatidylserine and sulfatide in lipid binding assays. Our results suggest that amphoterin is an endogenous protein in human platelets, which is exported to the cell surface during platelet activation. Interaction of amphoterin with the platelet surface may be mediated by sulfoglycolipids and phospholipids.

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6

Fages, C., R. Nolo, H. J. Huttunen, E. Eskelinen, and H. Rauvala. "Regulation of cell migration by amphoterin." Journal of Cell Science 113, no. 4 (February 15, 2000): 611–20. http://dx.doi.org/10.1242/jcs.113.4.611.

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Amphoterin, a major form of HMG (high mobility group) 1 proteins, is highly expressed in immature and malignant cells. A role in cell motility is suggested by the ability of amphoterin to promote neurite extension through RAGE (receptor of advanced glycation end products), an immunoglobulin superfamily member that communicates with the GTPases Cdc42 and Rac. We show here that cell contact with the laminin matrix induces accumulation of both amphoterin mRNA and protein close to the plasma membrane, which is accompanied by extracellular export of amphoterin. A role for amphoterin in extracellular matrix-dependent cell regulation is further suggested by the finding that specific decrease of amphoterin mRNA and protein, using antisense oligonucleotides transfected into cells, inhibits cell migration to laminin in a transfilter assay whereas the oligonucleotides in the culture medium have no effect. Moreover, affinity-purified anti-amphoterin antibodies inhibit cell migration to laminin, supporting an extracellular role for the endogenous amphoterin in cell motility. The finding that amphoterin expression is more pronounced in cells with a motile phenotype as compared to cells of dense cultures, is consistent with the results of the cell migration assays. Our results strongly suggest that amphoterin is a key player in the migration of immature and transformed cells.

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7

SPARATORE, Bianca, Mauro PATRONE, Mario PASSALACQUA, Marco PEDRAZZI, Deborah GAGGERO, Sandro PONTREMOLI, and Edon MELLONI. "Extracellular processing of amphoterin generates a peptide active on erythroleukaemia cell differentiation." Biochemical Journal 357, no. 2 (July 9, 2001): 569–74. http://dx.doi.org/10.1042/bj3570569.

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The release of amphoterin by murine erythroleukaemia cells exposed to the chemical inducer hexamethylenebisacetamide represents an essential step for the process of their terminal differentiation. Once exported in the culture medium, amphoterin undergoes limited proteolysis, catalysed by a serine proteinase also secreted by stimulated cells. The isolated proteinase is responsible for degradation of amphoterin, with the production of a 10-amino-acid-residue fragment, specifically retaining the cell-differentiation-stimulating activity of the native protein molecule. This peptide does not express other properties of amphoterin, such as protein kinase C-stimulating activity or systemic toxicity. These findings define a selective mechanism accounting for extracellular amphoterin functional maturation.

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8

Jin, Kai, Jing Zhou, Qisheng Zuo, Jiuzhou Song, Yani Zhang, Guobing Chang, Guohong Chen, and Bichun Li. "Transcriptome Sequencing and Comparative Analysis of Amphoteric ESCs and PGCs in Chicken (Gallus gallus)." Animals 10, no. 12 (November 27, 2020): 2228. http://dx.doi.org/10.3390/ani10122228.

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Chicken (Gallus gallus) pluripotent embryonic stem cells (ESCs) and primordial germ cells (PGCs) can be broadly applied in the research of developmental and embryonic biology, but the difference between amphoteric ESCs and PGCs is still elusive. This study determined the sex of collected samples by identifying specific sex markers via polymerase chain reaction (PCR) and fluorescence activated cell sorter (FACS). RNA-seq was utilized to investigate the transcriptomic profile of amphoteric ESCs and PGCs in chicken. The results showed no significant differentially expressed genes (DEGs) in amphoteric ESCs and 227 DEGs exhibited in amphoteric PGCs. Moreover, those 227 DEGs were mainly enriched in 17 gene ontology (GO) terms and 27 pathways according to Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis. Furthermore, qRT-PCR was performed to verify RNA-seq results, and the results demonstrated that Notch1 was highly expressed in male PGCs. In summary, our results provided a knowledge base of chicken amphoteric ESCs and PGCs, which is helpful for future research in relevant biological processes.

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9

Kawaguchi, Haruma. "Amphoteric polymers." Kobunshi 35, no. 10 (1986): 972–75. http://dx.doi.org/10.1295/kobunshi.35.972.

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10

Holzman, Suzana, and N. Avram. "Amphoteric Surfactants." Tenside Surfactants Detergents 23, no. 6 (December 1, 1986): 309–13. http://dx.doi.org/10.1515/tsd-1986-230608.

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11

Ren, Shuang, Zhaofu Meng, Xiuxian Sun, Haoyuan Lu, Mengfei Zhang, Altaf Hussain Lahori, and Shuaibin Bu. "Comparison of Cd2+ adsorption onto amphoteric, amphoteric-cationic and amphoteric-anionic modified magnetic bentonites." Chemosphere 239 (January 2020): 124840. http://dx.doi.org/10.1016/j.chemosphere.2019.124840.

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12

Li, Zhenliang, Zunli Mo, Pengji Yan, Shujuan Meng, Ruijuan Wang, Xiaohui Niu, Nijun Liu, and Ruibin Guo. "Amino acid-inspired electrochemical recognition of phenylalanine enantiomers using amphoteric chitosan." New Journal of Chemistry 42, no. 9 (2018): 6817–23. http://dx.doi.org/10.1039/c8nj00391b.

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Inspired by amino acids with amphoteric groups for electrochemical enantiorecognition, amphoteric chitosan (ACCS) was prepared with chloroacetic acid and CS, and has perfect solubility in alkaline and acid solution, compared with CS.

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13

Kamitani, Wataru, Yuko Shoya, Takeshi Kobayashi, Makiko Watanabe, Byeong-Jae Lee, Guoqi Zhang, Keizo Tomonaga, and Kazuyoshi Ikuta. "Borna Disease Virus Phosphoprotein Binds a Neurite Outgrowth Factor, Amphoterin/HMG-1." Journal of Virology 75, no. 18 (September 15, 2001): 8742–51. http://dx.doi.org/10.1128/jvi.75.18.8742-8751.2001.

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ABSTRACT The Borna disease virus (BDV) p24 phosphoprotein is an abundant protein in BDV-infected cultured cells and animal brains. Therefore, there is a possibility that binding of the p24 protein to cellular factor(s) induces functional alterations of infected neural cells in the brain. To identify a cellular protein(s) that interacts with BDV p24 protein, we performed far-Western blotting with extracts from various cell lines. Using recombinant p24 protein as a probe, we detected a 30-kDa protein in all cell lines examined. Binding between the 30-kDa and BDV p24 proteins was also demonstrated using BDV p24 affinity and ion-exchange chromatography columns. Microsequence analysis of the purified 30-kDa protein revealed that its N terminus showed complete homology with rat amphoterin protein, which is a neurite outgrowth factor abundant in the brain during development. Mammalian two-hybrid and immunoprecipitation analyses also confirmed that amphoterin is a specific target for the p24 protein in vivo. Furthermore, we showed that infection by BDV, as well as purified p24 protein in the medium, significantly decreased cell process outgrowth of cells grown on laminin, indicating the functional inhibition of amphoterin by interaction with the p24 protein. Immunohistochemical analysis revealed decreased levels of amphoterin protein at the leading edges of BDV-infected cells. Moreover, the expression of the receptor for advanced glycation end products, of which the extracellular moiety is a receptor for amphoterin, was not significantly activated in BDV-infected cells during the process of extension, suggesting that the secretion of amphoterin from the cell surface is inhibited by the binding of the p24 protein. These results suggested that BDV infection may cause direct damage in the developing brain by inhibiting the function of amphoterin due to binding by the p24 phosphoprotein.

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14

Yu, De De, and Hong Wei Zhang. "Structure of Phosphate Amphoteric Cassava Starch and its Reinforcing Effect on Secondary Fiber." Advanced Materials Research 549 (July 2012): 87–91. http://dx.doi.org/10.4028/www.scientific.net/amr.549.87.

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In the present work, a series of the phosphate amphoteric cassava starch was synthesized by a two-step semi-dry process with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CTA) as the cationic reagent and phosphate mixture as the anionic reagent. The structure of the amphoteric starch was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The reinforcing effects of the amphoteric starch on the secondary fiber were also studied. The results indicated that the reaction occurred not only on the surface but also in the interior of starch granule, not only in the amorphous region, but also in the crystalline region. All the amphoteric starch showed reinforcing effect on the secondary fiber. The No. 5 sample showed better reinforcing effects on paper strength due to its higher total degree of substitution (0.095), proper DSA/DSC ratio (DSC=0.067, DSA=0.028) and interior modification of the starch granule. Compared with the control sample, the secondary fiber paper with 1.0 wt% (relative to dried pulp) of No.5 phosphate amphoteric starch showed 25.6%, 21.4% and 29.4% increases in tensile index, tearing index, and burst index, respectively.

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15

Liu, Yan Jun, Chun Ying Lv, and Jia Yang. "Studies of Protein Absorption and Fouling Behavior on Amphoteric Charged Polypropylene Microfiltration Membrane." Key Engineering Materials 467-469 (February 2011): 2024–29. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.2024.

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To improve the antifouling property of PP membrane, a series of amphoteric charged membranes was prepared by the introduction of cysteine on polypropylene membrane. The modified membrane presents higher water flux than original membrane due to the improved hydrophilicity. It was proved by zeta potential that modified membrane inherited the amphoteric characteristic from cysteine. The isoelectric point of modified membranes are at pH 7.2 and 6.5 for 7.6% and 16.1% grafted membranes respectively. Due to the amphoteric characteristic of both modified membrane and BSA, electrical repulsion exsists among grafting chains and BSA in acid and alkaline solution. As a result, modified membranes have much lower adsorption amount of BSA than original PP membrane. Moreover, modified membranes show obvious antifouling property to BSA, due to the improved hydrophilicity of membrane and the electrical repulsion between BSA and membrane. Therefore, the amphoteric charged membranes modified by cysteine show great potential to resist protein fouling in a wide range of pH.

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16

Frisch, Hendrik, Jan Patrick Unsleber, David Lüdeker, Martin Peterlechner, Gunther Brunklaus, Mark Waller, and Pol Besenius. "pH-Schaltbare amphotere supramolekulare Copolymere." Angewandte Chemie 125, no. 38 (August 8, 2013): 10282–87. http://dx.doi.org/10.1002/ange.201303810.

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17

Остапенко (Ostapenko), Алина (Alina) Анатольевна (Anatol'evna), Иван (Ivan) Николаевич (Nikolaevich) Ковернинский (Koverninskij), and Ольга (Ol'ga) Викторовна (Viktorovna) Ткаченко (Tkachenko). "APPLICATION OF CHEMICAL ADDITIVES FOR RESOURCE CONSERVATION PRODUCTION OF PAPER AND CARDBOARD." chemistry of plant raw material, no. 2 (February 7, 2018): 225–32. http://dx.doi.org/10.14258/jcprm.2018023488.

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The aim of the study is to evaluate the interaction of amphoteric polymer resins with cellulose fibers at the molecular level.The interaction of amphoteric polymer resins with cellulose fragments was determined by standard 1H NMR and 13C spectroscopy techniques.To study the interaction of amphoteric polymeric resins with cellulose at the molecular level, imitation modeling has been carried out in the work. The essence of the simulation is the replacement of cellulose fibers with substances that are close to the functional purpose of cellulose. Such substances include glucose, sucrose, starch and ethylene glycol, which dissolve in water. It is established that in the presence of a large amount of water in the APS – waste paper system, intermolecular and interfluid hydrogen bonds are formed, and upon reaching a critical amount of water in the system, new covalent ether-type bonds are formed between the functional groups of the components as model systems and amphoteric polymeric systems resin - cellulose and this indicates the possibility of increasing the physical and mechanical properties of paper and paperboard from secondary raw materials.The results show that simulation simulation of structural and functional transformations in complex systems, including the cellulose-APS system, confirms the presence in them of processes that occur during the interaction of amphoteric polymeric resins with hydroxyl groups of cellulose fibers

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18

Kiyono, Ryotaro. "Amphoteric Charged Membranes." MEMBRANE 38, no. 6 (2014): 274–78. http://dx.doi.org/10.5360/membrane.38.274.

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19

Babaev, Eugeny V. "π-Amphoteric Heterocycles." Bulletin des Sociétés Chimiques Belges 101, no. 9 (September 1, 2010): 823–24. http://dx.doi.org/10.1002/bscb.19921010914.

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20

Zhu, Jun Feng, Guang Hua Zhang, Zhuo Miao, and Hao Hao. "Fabrication and Preparation of Coal-Water Slurry Dispersant with Amphoteric Polycarboxylate." Advanced Materials Research 335-336 (September 2011): 1257–61. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1257.

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Coal-water slurry （CWS）dispersant is a key to prepare fine coal-water slurry. A novel amphoteric polycarboxylic (AmPC) dispersant for CWS was copolymerized in aqueous solution by comonomers methacrylate polyglycol monoester (PA), propylene sulfur sodium (SAS) and cationic comonomer methacryloyloxy ethyl trimethylammonium chloride(DMC).Methacrylate polyglycol monoester was prepared by direct esterifying with methacrylate acid (AA) and polyethylene glycol (PEG) in our laboratory. And then, The molecule structure of amphoteric polycarboxylic dispersant was characterized by FTIR. Besides, the dispersant was applied in Shenfu coal slurry. Through examining properties of the coal slurry, the effects of amount of cationic monomer DMC, the concentration of initiator and reaction temperature on dispersant performance were discussed. The result shows that the viscosity reducing of amphoteric polycarboxylic dispersant is better than the dispersant in stock which hasn’t cationic monomer when the dosage of DMC is 5.0wt%. It has been proved that the amphoteric polycarboxylic dispersion agent is suitable for Shenfu coal slurry. When the dosage of AmPC dispersant is up to 0.5wt%, the highest concentration of coal-slurry can reach 65.4wt%.

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21

Li, He Ping, Yang Hu, Hu Qiang Lv, Yong Zhe Yang, and Yao Zhang. "Synthesis of Double Crosslinked Amphoteric Cassava Starch Resin and Performance of Absorbing Cu (II)." Advanced Materials Research 726-731 (August 2013): 588–91. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.588.

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Sodium polyphosphate-crosslinked starch was synthesized by using cassava starch and sodium polyphosphate as main material and crosslinked agent individually. On above basis, double crosslinked amphoteric cassava starch resin was synthesized by N,N'-methylene bisacrylamide as inner-crosslinked agent, dimethyl diallyl ammonium chloride (DMDAAC) and acrylic acid as amphoteric grafted monomer. The product was characterized by infrared spectrum (FTIR). The results indicate that the cassava starch was modified successfully, and the final product was double crosslinked amphoteric cassava starch resin. Adsorption behavior of Cu2+ was studied in the condition of different adsorption time, and found that the removal rate and the adsorption capacity of Cu2+ reached up to 98.3% and 196.6 mg/g respectively.

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22

Kouril, Milan, Alexander Palffy, Jan Hruska, Pavel Novak, and Šárka Msallamová. "Detection of pH Increase at the Surface of Cathodically Polarized Metal by Means of Amphoteric Metals Activation." Materials Science Forum 844 (March 2016): 55–58. http://dx.doi.org/10.4028/www.scientific.net/msf.844.55.

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Nowadays, the cathodic protection is a common way of additional corrosion protection of buried structures. This protection is usually accompanied by cathodic polarisation on the protective potential of-850 mV(CSE). Its function is to prevent undesirable corrosion rates, in case the coating protection fails. Objective was to predict a state in terms of passivity or activity in which a carbon steel is in. And to do so, there is a monitoring of pH values by amphoteric metals, which would track pH changes of cathodically protected material in a soil. For pH detection, Al and Zn, were used. Main aim was to track corrosion rate of these amphoteric metals as a most reliable way to predict pH changes. Cathodic protection led to higher pH values of model soil located closely to surface of protected material. In case of carbon steel, alkalisation led to passive state and in the same time amphoteric metals could exist in active state. The aim of this work was to clarify usage of monitoring the corrosion rate of amphoteric metals for detection of pH values influenced by cathodic polarisation.Graphical abstract: Fig. 1 Kinetic and thermodynamic demonstration of passivation of cathodically protected steel

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23

Zhang, Hong Wei, and Guo Ping Zheng. "Study on Structure of Amphoteric Starch and Its Reinforcing Effect on Secondary Fiber." Advanced Materials Research 236-238 (May 2011): 1112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1112.

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In the presented work, a series of the phosphate amphoteric cassava starch were synthesized by a two-step semi-dry process with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CTA) as the cationic reagent and phosphate mixture as the anionic reagent. The structure of the amphoteric starch was characterized by FTIR and XRD. The reinforcing effects of the amphoteric starch on the secondary fiber were also studied. The results indicated that the reaction occurred not only in the amorphous region, but also in its crystalline region. When the cationic starch reacted with different amount of phosphates, the degree of cation substitution (DSc) of products was decreased with the dosage of the phosphates. When cationic starch with different DSc reacted with the same amount of phosphates, the degree of anion substitution (DSa) of products was decreased with the DSc. All the amphoteric starch showed reinforcing effect on the secondary fiber. The No. 7 sample showed better reinforcing effects on paper strength due to its higher total degree of substitution (0.095), proper DSa/DSc ratio (DSc = 0.067, DSa = 0.028) and interior modification of the starch granule. Compared with the control sample, the secondary fiber paper with 1.0 wt % (relative to dried pulp) of 7# modified starch showed 23.5%, 20.3% and 29.4% increases in tensile index, tearing index, and burst index, respectively.

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24

MURAMATSU, Nobuhiro, Hidetoshi KAWASAKI, Fumiyo ONOE, Hiroyuki OHSHIMA, and Tamotsu KONDO. "Hemolysis by Amphoteric Surfactants." Journal of Japan Oil Chemists' Society 39, no. 8 (1990): 555–59. http://dx.doi.org/10.5650/jos1956.39.8_555.

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25

Koike, Toshio. "Amphoteric Latex and Application." JAPAN TAPPI JOURNAL 48, no. 5 (1994): 677–87. http://dx.doi.org/10.2524/jtappij.48.677.

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26

He, Zhi, and Andrei K. Yudin. "Amphoteric α-Boryl Aldehydes." Journal of the American Chemical Society 133, no. 35 (September 7, 2011): 13770–73. http://dx.doi.org/10.1021/ja205910d.

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27

Palicka, Jadwiga. "Amphoterics in household detergents." Journal of Chemical Technology & Biotechnology 50, no. 3 (April 24, 2007): 331–49. http://dx.doi.org/10.1002/jctb.280500305.

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28

Uphues, Gpnter. "Chemistry of amphoteric surfactants." Lipid - Fett 100, no. 11 (November 1998): 490–97. http://dx.doi.org/10.1002/(sici)1521-4133(199811)100:11<490::aid-lipi490>3.0.co;2-2.

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29

Wahl, U., J. G. Correia, J. P. Araújo, E. Rita, and J. C. Soares. "Amphoteric arsenic in GaN." Applied Physics Letters 90, no. 18 (April 30, 2007): 181934. http://dx.doi.org/10.1063/1.2736299.

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30

Pavesi, L., P. Giannozzi, and F. K. Reinhart. "Amphoteric behavior ofH0in GaAs." Physical Review B 42, no. 3 (July 15, 1990): 1864–67. http://dx.doi.org/10.1103/physrevb.42.1864.

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31

Coope, Tim, Kenneth Moloy, Allison Yake, Viacheslava Petrov, Charles Taylor, Ming Hung, and Sheng Peng. "Fluorinated sulfamido amphoteric surfactants." Journal of Fluorine Chemistry 161 (May 2014): 41–50. http://dx.doi.org/10.1016/j.jfluchem.2014.01.022.

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32

Zhang, Rong Ming, Zhen Yu Zhang, Hong Man Shan, and Yue Wang. "Synthesis of Myristyl Sulpho Betaine Type Amphoteric Surfactant." Advanced Materials Research 455-456 (January 2012): 1217–20. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1217.

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A kind of novel betaine type amphoteric surfactant was synthesized using tetradecylamine and pentaerythritol as the starting material. The influence factors of the synthesis process were studied.The optimal condition of the synthesis was gained. The results have show that the reaction time and mole ratio (Dimethyl tetradecyl tertiary/ Intermediate) were 16h and 1.2/1 at 120°C.The structure of myristyl sulpho betaine type amphoteric surfactant was identified by FTIR.Then it was performed the surface tension tests to determine the critical micelle concentration (cmc).

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33

Baimenov, Alzhan, Dmitriy Berillo, Leila Abylgazina, Stavros G. Poulopoulos, and Vassilis J. Inglezakis. "Novel Amphoteric Cryogels for Cd²⁺ Ions Removal from Aqueous Solutions." Key Engineering Materials 775 (August 2018): 376–82. http://dx.doi.org/10.4028/www.scientific.net/kem.775.376.

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In this work, amphoteric cryogels based on N,N-dimethyl acrylamide, methacrylic acid and allylamine, crosslinked by N,N-methylenebisacrylamide were synthesized by free-radical polymerization in cryo-conditions. The synthesized cryogels were used for the removal of cadmium ions from aqueous solutions under different pH values. The chemical structure was studied by FTIR, porosity by nitrogen adsorption and morphology by scanning electron microscopy and texture analyzer. The amphoteric properties of cryogels were studied by zeta potential measurements. Adsorption tests revealed that cryogels exhibit 3 times higher adsorption capacity at pH 6.0 than at pH 4.0. The maximum adsorption capacity of the amphoteric cryogels for Cd2+ was 113 mg/g, at pH 6.0 and initial Cd2+ concentration 100 ppm. The results suggest that the predominant removal mechanism is ion exchange between sodium, which initially presents in the structure of the cryogel, and cadmium from the aqueous phase. Recovery studies suggested that the cryogels used can be regenerated and efficiently reused.

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34

Yi, Chengzhi, Xiaowei Zhang, Huixian Yan, and Bo Jin. "Finite Element Simulation and the Application of Amphoteric pH-sensitive Hydrogel." International Journal of Applied Mechanics 09, no. 05 (July 2017): 1750063. http://dx.doi.org/10.1142/s1758825117500636.

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Amphoteric hydrogels have been widely used in biologic and mechanic areas such as robot joints, biological cells, drug delivery systems. There are many factors that can influence the deformation of hydrogels, such as pH value, concentration of salt ions, solid constrains and external force, which all together makes the calculation very complicated. In this paper, an improved model for the calculation of amphoteric pH-sensitive hydrogels’ deformation is developed so that the behaviors of hydrogels in both acidic and alkaline solutions can be described quantitatively, and this model is implemented into finite element method (FEM) software ABAQUS in order to simulate hydrogel’s homogeneous and inhomogeneous deformations. The FEM results under free swelling state are compared with both analytical solution and FEM results existed before, and FEM results fit well with the experimental data. The buckling of amphoteric pH-sensitive hydrogel membrane is also analyzed, some natural phenomena, such as the wrinkling of human finger’s skin and the broad bean testa are successfully explained.

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Zhang, Rong Ming, Dong Hui Ma, and Zhen Yu Zhang. "Synthesis of Bismyristyl Bisulpho Betaine Type Amphoteric Surfactant." Key Engineering Materials 480-481 (June 2011): 1–5. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.1.

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A kind of novel betaine type amphoteric surfactant was synthesized using tetradecylamine and pentaerythritol as the starting material. The structure of bismyristyl bisulpho betaine type amphoteric surfactant was identified by FTIR.The influence factors of the synthesis process were studied.The optimal condition of the synthesis was gained. The results have show that the reaction time and mole ratio (Intermediate / Dimethyl tetradecyl tertiary) were 18 h and 0.5/1 at 135°C. Then it was performed the surface tension tests to determine the critical micelle concentration(cmc).

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PALENSKIS, VILIUS, JONAS MATUKAS, JUOZAS VYŠNIAUSKAS, SANDRA PRALGAUSKAITĖ, HADAS SHTRIKMAN, DALIUS SELIUTA, IRMANTAS KAŠALYNAS, and GINTARAS VALUŠIS. "ANALYSIS OF NOISE CHARACTERISTICS OF GaAs TUNNEL DIODES." Fluctuation and Noise Letters 12, no. 03 (September 2013): 1350014. http://dx.doi.org/10.1142/s0219477513500144.

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An analysis and investigation of noises of GaAs tunnel diodes, which abrupt p+-n+ profile was obtained by using amphoteric nature of silicon, were performed. The main scope of this work was to verify the concepts of the explanation of white noise characteristics on the ground of shot noise and on the ground of the Gupta theorem of thermal noise in resistive elements. The other scope was to investigate the peculiarities of low frequency noise in p+-n+ junctions formed by using amphoteric silicon nature.

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Paun, Iuliana, Vasile Ion Iancu, Liliana Cruceru, Marcela Niculescu, and Florentina Laura Chiriac. "Simultaneous Determination of Anionic, Amphoteric and Cationic Surfactants Mixtures in Surface Water." Revista de Chimie 69, no. 1 (February 15, 2018): 27–30. http://dx.doi.org/10.37358/rc.18.1.6038.

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A simple, reliable and accurate HPLC/CAD method was developed for the determination of anionic (sodium dioctyl sulfosuccinate and sodium 1-dodecane sulfonate), amphoteric (CHAPS (3-[(3-Cholamidopropyl) dimethylammonium]-1-propanesulfonate hydrate)) and cationic (benzethonium chloride) surfactants mixture from surface water samples. The chromatographic analysis was performed on an Acclaim Surfactant Plus (150 x 3.0 mm, 3 mm d.p.) column acquired from Thermo Scientific, kept at 300C. All experiments were performed in gradient elution conditions at a flow-rate of 0.6 mL/min. Mobile phase composition was a mixture of acetonitrile (A) and 0.1 M ammonium acetate solution acidified to pH 5 with acetic acid (B). The limit of detection (LD) were 20 mg/L for anionic surfactants and 30 mg/L for cationic and amphoteric surfactants. The calibration curves were linear between 15 mg/L � 110 mg/L, with R2 values above 0.992 for all surfactants. Solid phase extraction (SPE) using polymeric (Strata X) cartridges has been applied to extract and concentrate the target analytes from the synthetic samples. Surfactants recoveries after SPE procedure were situated between 91.5�94.6%. Intra-day and inter-day precision (RSD%) were situated between 4.0 � 7.7% and 7.5 � 11.7%, respectively. Limit of quantitation (LQ) was lower than 80 mg/L for anionic surfactants and 90 mg/L for cationic and 100 mg/L for amphoteric surfactants. The new sensitive and selective HPLC/CAD developed method allows simultaneous determination of anionic, amphoteric and cationic surfactants mixture from environmental samples (surface water).

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Zou, Li Xia, Qing Cheng Liu, Qiong Xu, and Jing Hua Rong. "A Study in the Adsorption Behaviors of Cr (VI) on Crosslinked Amphoteric Starches Synthesized through Using the Microwave Radiation Method." Advanced Materials Research 87-88 (December 2009): 387–92. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.387.

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Crosslinked amphoteric starches (CAS) with quaternary ammonium cationic and carboxymethyl anionic groups were prepared by a microwave radiation method. Their adsorption behavior for Cr(VI) was investigated. The results showed that high the degree of substitution (DS) of modified starch was favorable to the synthesis by the microwave heating and crosslinked amphoteric starches prepared with higher the adsorption capacity than by the drying reaction. The adsorption capacity increases with the increasing cationic groups and decreased with increasing degree of substitution of anionic groups. The adsorption capacity was found to follow the Langmuir isotherm.

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Park, Jung Su, Trang Thu Tran, Jongmin Kim, and Jonathan L. Sessler. "Electrochemical amphotericity and NIR absorption induced via the step-wise protonation of fused quinoxaline-tetrathiafulvalene-pyrroles." Chemical Communications 54, no. 36 (2018): 4553–56. http://dx.doi.org/10.1039/c8cc02018c.

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Vincent-Rocan, Jean-François, Ryan A. Ivanovich, Christian Clavette, Kyle Leckett, Julien Bejjani, and André M. Beauchemin. "Cascade reactions of nitrogen-substituted isocyanates: a new tool in heterocyclic chemistry." Chemical Science 7, no. 1 (2016): 315–28. http://dx.doi.org/10.1039/c5sc03197d.

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Lai, Zengwei, Renwei Zhang, Qiang Feng, and Jianwei Sun. "3-Aminooxetanes: versatile 1,3-amphoteric molecules for intermolecular annulation reactions." Chemical Science 11, no. 36 (2020): 9945–49. http://dx.doi.org/10.1039/d0sc04254d.

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Maurya, Sandip, Sung-Hee Shin, Ju-Young Lee, Yekyung Kim, and Seung-Hyeon Moon. "Amphoteric nanoporous polybenzimidazole membrane with extremely low crossover for a vanadium redox flow battery." RSC Advances 6, no. 7 (2016): 5198–204. http://dx.doi.org/10.1039/c5ra26244e.

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Brvar, M. "Chlorobenzylidene malononitrile tear gas exposure." Human & Experimental Toxicology 35, no. 2 (March 24, 2015): 213–18. http://dx.doi.org/10.1177/0960327115578866.

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Objective: Chlorobenzylidene malononitrile (CS) is the tear gas used by the police. The aim was to evaluate an amphoteric, hypertonic, and chelating rinsing solution in CS exposure. Methods: The first (CS) group of six police officers was exposed to CS only. The second (preexposure) group of eight sprayed their faces with an aqueous, hypertonic, amphoteric, and chelating solution before CS exposure. The third (postexposure) group of eight sprayed their faces with an aqueous, hypertonic, amphoteric, and chelating solution after CS exposure. The time between exiting the CS cloud and arriving at the “ready for action” checkpoint was measured. Their facial pain both inside the CS cloud and at the checkpoint was assessed (0–10 points). Results: The pain level inside the CS cloud was significantly lower in the preexposed group (5.6 ± 1.1; p = 0.01) than in the CS group (9.7 ± 0.5) and in the postexposure group (9.1 ± 0.4) where it was similar. The time interval between CS exposure and arrival at the checkpoint in the preexposure group (1:26 ± 0:44 min) was significantly shorter than both in the CS group (2:28 ± 0:25 min; p = 0.04) and postexposure group (2:30 ± 0:48 min; p = 0.02) where it was not different. The residual pain at the checkpoint in the preexposure (1.1 ± 0.4) and postexposure (1.4 ± 0.7) groups was similar with a significant lower pain level than in the CS group (2.3 ± 0.5; p = 0.02). Conclusion: CS decontamination with an aqueous, hypertonic, amphoteric, and chelating solution reduces facial pain, whereas prevention with it reduces pain and recovery time.

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Bai, Yong Zhi, Hong Yan Guan, and Jin Hua Cui. "Effect of Amphoteric Zn²⁺ on the Determination of B₂O₃ Content in Glass." Key Engineering Materials 680 (February 2016): 289–92. http://dx.doi.org/10.4028/www.scientific.net/kem.680.289.

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The amphoteric ZnO can affect the titration of B2O3 content in glass since the Zn2+ will react with standard NaOH solution during the acid-base titration process and the result will be slightly higher sequentially. In this paper, the elimination of amphoteric Zn2+ was carried out by means of carbonate and Zn (OH)2 precipitation method. Results show that the optimal pH value for Zn (OH)2 precipitation is between 9~10. Verification test under borosilicate glass standard substance indicates that this method shows great applicability and accuracy in the determination of B2O3 content in Zn containing glass.

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Huang, Kang-Ting, Pai-Shan Hsieh, Lien-Guo Dai, and Chun-Jen Huang. "Complete zwitterionic double network hydrogels with great toughness and resistance against foreign body reaction and thrombus." Journal of Materials Chemistry B 8, no. 33 (2020): 7390–402. http://dx.doi.org/10.1039/d0tb01163k.

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Cai, Cheng, Xuejuan Zhan, Meijun Zeng, Hongming Lou, Yuxia Pang, Jia Yang, Dongjie Yang, and Xueqing Qiu. "Using recyclable pH-responsive lignin amphoteric surfactant to enhance the enzymatic hydrolysis of lignocelluloses." Green Chemistry 19, no. 22 (2017): 5479–87. http://dx.doi.org/10.1039/c7gc02571h.

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Kim, Dong Yeon, D. ChangMo Yang, Jenica Marie L. Madridejos, Amir Hajibabaei, Chunggi Baig, and Kwang S. Kim. "Anisotropic and amphoteric characteristics of diverse carbenes." Physical Chemistry Chemical Physics 20, no. 20 (2018): 13722–33. http://dx.doi.org/10.1039/c8cp00457a.

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Xin, Tang, Hu Xuzeng, and Wan Haodong. "Preparation and characterization of a novel amphoteric polymer for oil well cementing with superior performances." Polymers and Polymer Composites 29, no. 1 (January 8, 2020): 29–39. http://dx.doi.org/10.1177/0967391119898018.

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A novel amphoteric polymer TH-1 was synthesized using the monomers of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid, acrylamide, and cationic monomer through radical copolymerization as filtrate loss reducer in oil well cementing. Optimal synthesis conditions of TH-1 were obtained by an orthogonal experiment. The composition of copolymer (TH-1) was characterized by Fourier-transform infrared spectrum and proton nuclear magnetic resonance spectroscopy. The thermal stability of the synthesized copolymer was tested by thermogravimetric analysis. The fluid loss (FL) control and thickening performance of cement slurry incorporating TH-1 were evaluated at different temperatures. The filtration reduction mechanism of TH-1 was finally discussed. Results suggest that the amphoteric polymer is the target product polymerized by all the monomers, which presents excellent filtrate reduction property, high thermal stability, and strong saline tolerance under 200°C. The amphoteric polymer TH-1 includes cationic and anionic group in a molecule structure, which can adsorb firmly onto the surface of cement particles through electrostatic attraction and form adsorption membrane of viscoelastic polymer. In this way, compact cement filter cakes are formed, thereby efficiently reducing the FL.

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Sankaralingam, Muniyandi, So Hyun Jeon, Yong-Min Lee, Mi Sook Seo, Kei Ohkubo, Shunichi Fukuzumi, and Wonwoo Nam. "An amphoteric reactivity of a mixed-valent bis(μ-oxo)dimanganese(iii,iv) complex acting as an electrophile and a nucleophile." Dalton Transactions 45, no. 1 (2016): 376–83. http://dx.doi.org/10.1039/c5dt04292e.

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Ren, Zhiyong, Lu Liu, Huafen Wang, Yang Fu, Lei Jiang, and Baixia Ren. "Novel amphoteric polyurethane dispersions with postpolymerization crosslinking function derived from hydroxylated tung oil: synthesis and properties." RSC Advances 5, no. 35 (2015): 27717–21. http://dx.doi.org/10.1039/c5ra03115j.

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