Aqueous solution properties, biodegradability, and antimicrobial activity of some alkylpolyglycosides surfactants / M. M. A. El-Sukkary in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 5/2009 (09-10/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 5/2009 (09-10/2009) . - p. 311-316 Titre : Aqueous solution properties, biodegradability, and antimicrobial activity of some alkylpolyglycosides surfactants Type de document : texte imprimé Auteurs : M. M. A. El-Sukkary, Auteur ; W. I. M. El-Azab, Auteur ; S. M. Helmy, Auteur ; Aiad Ismail, Auteur ; N. A. Syed, Auteur Année de publication : 2009 Article en page(s) : p. 311-316 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alkyl polyglycosides Antimicrobiens Biodégradation Surfactants Thermodynamique Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In the present investigation, a series of alkyl polyglycosides with alkyl chain length of C 8, 9, 10, 12 and 14 were synthesized using transacetalization method. Purity of the products was investigated using high performance liquid chromatography. Surface parameters particularly Effectiveness "pi"cmc, Efficiency PC20, maximum surface excess "gamma" max, minimum surface area Amin and HLB values are investigated, in addition to thermodynamic parameters ("Delta" Gads and "Delta Gmic). resistance to hydrolysis for the prepared compounds was investigated. The synthesized compounds were tested for their biodegradability in Nile river water according to die-away test method and their antimicrobial activity against different strains of bacteria, yeast and fungi was investigated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6253 [article]

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Fragmentation mechanism of alkyl- monoglycosides by mass spectrometry / N. A. Sayed in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 4/2010 (07-08/2010)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 4/2010 (07-08/2010) . - p. 217-221 Titre : Fragmentation mechanism of alkyl- monoglycosides by mass spectrometry Type de document : texte imprimé Auteurs : N. A. Sayed, Auteur ; M. M. A. El-Sukkary, Auteur ; W. I. M. El-Azab, Auteur Année de publication : 2010 Article en page(s) : p. 217-221 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aglucone Alkyl polyglycosides Spectrométrie de masse Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Alkylmonoglycosides with different alkyl chain lengths (APG8, APG9, APG10 and APG14) were prepared by Fisher reaction of glucose with fatty alcohols. Excess alcohol was used to increase the possibility of producing alkyl monoglycosides products. Mass spectrometry with chemical ionization was used to confirm their structures as alkyl monoglycosides. Accordingly, the obtained signals at m/z = 293, 307, 321 and 377 corresponds to their protonated molecules. The base lines which are the most intensive signals in each spectrum at m/z = 145, 127, 141 and 197 represent the most abundant ions and define the pathway of their fragmentation mechanism. The mass 145 for APG8 is generated from the parent ion by elimination of the mass ROH followed by H2O. For this compound cleavage occurs at the C–O bond next to the glucose ring, while fragmentation of alkyl monoglycosides with carbon number 9, 10 and 14 occurs at the O–R bond releasing the alkyl cation R of the aglucone moiety (CnH2n+1) along with large fragment ions characteristic of the glucose moiety. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9799 [article]

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Molecular, surface, thermodynamic properties and biodegradability of nonionic surfactants based on castor oil / E. A. M. Gad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 5/2009 (09-10/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 5/2009 (09-10/2009) . - p. 272-278 Titre : Molecular, surface, thermodynamic properties and biodegradability of nonionic surfactants based on castor oil Type de document : texte imprimé Auteurs : E. A. M. Gad, Auteur ; E. M. S. Azzam, Auteur ; I. Aiad, Auteur ; W. I. M. El-Azab, Auteur Année de publication : 2009 Article en page(s) : p. 272-278 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie des surfaces Huiles et graisses animales Surfactants Surfactants -- Biodégradation Thermodynamique Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A series of nonionic surfactants containing different chains of polyethylene oxide monomethyl ether [–O(CH2CH2O)xCH3, x = 7, 12, 16, 44 and 112] based on castor oil were synthesized. Their structures were confirmed using FTIR, 1H-NMR and 13C-NMR spectra. Structural effects of the synthesized surfactants on surface tension (Y), critical micelle concentration (cmc) and hydrophile lipophile balance (HLB) were investigated. The effect of structural features on their surface behavior is analyzed through changes in surface properties, including effectiveness (Pi cmc) and efficiency (PC20) of adsorption, the surface excess concentration (and the area per surfactant molecule at the air/water interface at surface saturation (Amin). Thermodynamic properties, adsorption and micellezation of the prepared surfactant in addition to their biodegradability were investigated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6240 [article]

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