Synthesis, surface active and antimicrobial properties of new alkyl 2,6-dideoxy-L-arabino-hexopyranosides

被引:28
|
作者
Rauter, AP
Lucas, S
Almeida, T
Sacoto, D
Ribeiro, V
Justino, J
Neves, A
Silva, FVM
Oliveira, MC
Ferreira, MJ
Santos, MS
Barbosa, E
机构
[1] Univ Lisbon, Fac Ciencias, Dept Quim & Bioquim, P-1749016 Lisbon, Portugal
[2] Inst Politecn, Escola Super Agr Santarem, P-2001904 Santarem, Portugal
[3] Inst Super Tecn, Ctr Quim Estrutural, P-1049001 Lisbon, Portugal
关键词
alkyl 2,6-dideoxy-L-arabino-hexopyranosides; synthesis; interfacial properties; non-ionic sugar surfactants; antimicrobial activity;
D O I
10.1016/j.carres.2004.11.020
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Synthesis of alkyl 2,6-dideoxy-L-arabino-hexopyranosides was accomplished by the reaction of 1,5-anhydro-2,6-dideoxy-L-arabino-hex-1-enitol with fatty alcohols in dichloromethane, catalyzed by triphenylphosphine hydrobromide. Reaction with octanol and dodecanol gave the corresponding alpha-glycosides in 50% and 42% yield, the P-glycosides in 20% and 21% yield and the of-anomer of the Ferrier product in 10% and 9% yield, respectively. Deacetylation of the alpha-/beta-glycosides with sodium methoxide in methanol afforded the amphiphilic L-arabino-hexopyranosides in 94-99% yield. The surface tension at the air-water interface of the octyl L-glycosides and of the dodecyl a-L-glycoside aqueous solutions at 35 degreesC was measured with a du Nouy ring tensiometer and surface properties such as critical micelle concentration (CMC), relative surface excess, molecular area at the interface and Gibbs micellization free energy were evaluated. The stereochemistry of the hexopyranoside ring in unimers and aggregates is correlated to the hydrophobicity and packing efficiency on the air-water interface. The antibacterial and antifungal activities of the surface-active glycosides were evaluated using the paper disk diffusion method. The dodecyl alpha-L-arabino-hexopyranoside was quite active over Bacillus cereus and Bacillus subtilis, while low activity was found for this glycoside over Enterococcus faecalis and Listeria monocytogenes. The octyl glycosides tested showed low activity over almost all the above-mentioned bacteria, and also over the fungus Candida albicans. No inhibition of Salmonella enteritidis and of the filamentous fungus Aspergillus niger was detected for any of the compounds tested. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:191 / 201
页数:11
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