Hassan bohari m yamin and mohammad kassim school of

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Unformatted text preview: by elemental analysis, infrared, nuclear magnetic resonance. X -ray crystallographic structures were obtained from single crystals via slow evaporation of the organic solutions of the products. The X -ray structures showed the ester molecules adopted a cis-trans configuration with respect to the position of the glycine moiety and cinnamoyl groups against the S atom across the C-N bonds. ORG-O19 ENZYMATIC SYNTHESIS OF PALM-BASED ESTERS IN IONIC LIQUIDS 1,* MBA Rahman, MR Chumati, EA Malek, M Basri and AB Salleh 1 1 1 2 1 Department of Chemistry, Faculty of Science, University Putra Malaysia, Serdang, 43400 Selangor, Malaysia 2 Department of Microbiology, Faculty of Biotechnology and Biomolecular Science, University Putra Malaysia, Serdang, 43400 Selangor, Malaysia E-mail: basya@science.upm.edu.my Series of palm-based esters were synthesized namely oleyl laurate, oleyl myristate, oleyl palmitate, oleyl stearate and oleyl oleate in ionic liquids. In this study, a new environmentally friendly method to synthesize palm-based esters will be conducted using two ionic liquids (ILs), one hydrophobic [bmim][PF6] and one hydrophilic [bmim][BF4] in the esterification of oleyl alcohol with fatty acids. Enzyme reactions in organic solvent which is n -hexane system were also carried out to compare the efficiency of ionic liquids for use as reaction media. Both Candida rugosa lipase and Novozyme 435 showed comparable or higher activity in ionic liquids compared to that in n -hexane. Lipase-catalyzed esterification in ionic liquids was futher investigated using fructose and fatty acids. The effect of reaction time, substrate ratio, lipase content, and temperature on the activity and stability of lipase was also studied. The highest yield of sugar ester was obtained in ionic liquid 1 -butyl-3-methylimidazolium trifluoromethanesulfonate ([Bmim][TfO]) with 73.1 % conversion after 48 hr with 2:1 ratio of fructose over oleic acid, at 60 °C. 194 3rd ICYC 2010 Universiti Sains Malaysia ORG-O20 23rd-25th June 2010 SYNTHESIS AND FLUORESCENCE PROPERTIES OF SELECTED 2-(2-METHOXYPHENOXY)...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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