Enzymatic preparation of polyethylene glycol esters of castor oil fatty acids and their surface-active properties |
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Authors: | M. Ghosh D. K. Bhattacharyya |
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Affiliation: | (1) Department of Chemical Technology, Calcutta University, 92, Acharya Prafulla Chandra Rd., 700 009 Calcutta, India |
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Abstract: | This study concerns the preparation and evaluation of nonionic surfactants prepared from polyethylene glycol (PEG) esters of castor oil fatty acid, a source of hydroxy fatty acid. A lipase-catalyzed esterification reaction has been employed to prepare PEG esters of hydroxy acid to overcome problems associated with chemical processes. Castor oil fatty acid (85% ricinoleic acid) was mixed with PEG of different molecular weight. Rhizomucor miehei lipase was added as catalyst (10% level) and the reaction was continued at 60°C under 2 mm Hg pressure for 360 min. Conversion of PEG to esters was in the range of 86–94%, depending on the molecular size of PEG. The products were isolated and examined for surface activity by surface tension measurement. Surface tension values measured at 25°C were about 36–37 dynes/cm. |
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Keywords: | Castor oil fatty acid lipase PEG-ester polyethylene glycol esters ricinoleic acid surface tension |
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