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5209443 
Journal Article 
Lipase-Catalyzed Synthesis of a Sugar Alcohol-Based Nonionic Surfactant 
Adnani, A; Basri, M; Chaibakhsh, Naz; Salleh, A; Rahman, MBA 
2011 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
ASIAN JOURNAL OF CHEMISTRY 
SAHIBABAD 
23 
1 
388-392 
English 
WOS:000285267300091 
Synthesis of three xylitol fatty acid esters, namely xylitol stearate, palmitate and caprate, was performed in hexane using lipase as the biocatalyst. Enzyme screening results indicated that novozym 435 had the highest catalytic activity in the synthesis of ester. The conversion of substrates was significantly increased by using molecular sieve for water removal. The maximum conversions of three fatty acids, stearic acid, palmitic acid and cupric acid to xylitol esters were 96, 92 and 88 %, respectively, at the optimum reaction conditions including temperature, 60 C; time, 18 h; substrate molar ratio, 1; enzyme amount, 0.12 g and molecular sieve amount 4 g in 30 mL solvent. Subsequent analysis by GC-MS indicated that the amount of produced diesters was significantly more than mono, tri and tetra esters. 
Xylitol; Fatty acid; Sugar alcohol ester; Novozym 435