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Processing of tocopherol and FA systems using a nonporous denser polymeric membrane.

Nagesha, G. K. and Subramanian, R. and Udaya Sankar, K. (2003) Processing of tocopherol and FA systems using a nonporous denser polymeric membrane. Journal of the American Oil Chemists Society, 80 (4). pp. 397-402.

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Abstract

Deodorizer distillate (DOD), a by-product obtained during vegetable oil refining, can be used as a source of tocopherols for application as food additives. Suitability of non-porous polymeric membranes for tocopherol enrichment was assessed using soy and esterified soy DOD and model systems (oleic acid with tocopherol concentrate). Tocopherols permeated preferentially over oleic acid in model systems and over oleic acid and other oil constituents during processing of soy DOD when using nonporous denser polymeric membranes (i.e. denser than reverse osmosis membranes). This observation was unexpected, since the separation in a denser membrane is generally based on a solution-diffusion mechanism. That tocopherols are less polar than oleic acid appears to have facilitated the preferential permeation of tocopherols through the hydrophobic membrane. Selectivity of the membrane for tocopherols improved with esterified soy DOD. The presence of fatty acid methyl esters (FAME) decreased the viscosity of the feed and thereby increased convective flow, which in turn improved permeate flux. FAME appeared to have exerted positive coupling effects with tocopherols, having better selectivity in spite of the greater solubility of FAME in the membrane material. Membrane selectivity for tocopherols improved upon dilution of the feed material with hexane, perhaps owing to greater solubility of tocopherols in hexane (nonpolar) than other feed constituents.

Item Type: Article
Uncontrolled Keywords: MEMBRANES-; OLEIC-ACID; PERMEABILITY-; SEPARATION-; SOYBEAN-OILS; TOCOPHEROLS-; PERMEATION-
Subjects: 600 Technology > 08 Food technology > 19 Lipids-oils/fats > 01 Oilseeds
600 Technology > 08 Food technology > 32 Antioxidants
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 26 Jun 2009 05:53
Last Modified: 11 Oct 2018 08:49
URI: http://ir.cftri.com/id/eprint/7573

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