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Food Lipids: Chemistry, Nutrition, and Biotechnology

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Figure 9 Structure of stachyose polyester.<br />

The different types of alkyl glycoside polyester synthesized by the latter process<br />

are shown in Figures 10–12. Up to 99% product yields have been reported. Physical<br />

properties are closer to those of vegetable oils than to sucrose polyester, partly because<br />

a maximum of only four fatty acids can be esterified. The alkyl glycosides are<br />

partially hydrolyzed <strong>and</strong> absorbed <strong>and</strong> can serve as reduced calorie but not as zero<br />

calorie fat substitutes.<br />

E. Sucrose Esters (SFEs)<br />

Sucrose fatty acid esters with a degree of substitution (DS) of 1–3 are highly hydrophilic,<br />

digestible, <strong>and</strong> absorbable; they are usable as solubilization, wetting, dispersion,<br />

emulsifying (especially oil-in-water, O/W, <strong>and</strong> some water-in-oil, W/O,<br />

emulsions), <strong>and</strong> stabilization agents, <strong>and</strong> as antimicrobial <strong>and</strong> protective coatings for<br />

fruits (8,34,35). They have a wide range of lipophilic–hydrophilic balance (HLB),<br />

namely, 1–16. They are tasteless, odorless, nontoxic, <strong>and</strong> biodegradable, <strong>and</strong> they<br />

can be used in food, cosmetic, <strong>and</strong> pharmaceutical applications. The structure of a<br />

sucrose monoester is shown in Figure 13.<br />

Figure 10 Structure of methyl glucoside polyester.<br />

Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved.

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