Author
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Knutson Jr, Clarence |
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Submitted to: Fine Particle Society
Publication Type: Abstract Only Publication Acceptance Date: 4/3/1998 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Fantesk**TM starch-oil composites prepared by jet-cooking mixtures of oil and starch in water are very useful for introducing lipophilic substances into aqueous suspensions. Aqueous solutions/suspensions of these composites can be drum dried to flakes, then ground to give free-flowing powders. Dried composites consist of 2-10 um oil droplets encapsulated in a starch matrix. Complete extraction of oil from dried composites cannot be accomplished with organic solvents; an amount of oil equivalent to approximately 5% of the starting weight of the composite can only be recovered by hydrolytic degradation of the starch. Films prepared by air drying solutions of composites securely entrap oil in the starch matrix, so that only traces of oil can be extracted from the dry film with hexane. However, if such a film is dehydrated by immersion in ethanol, most of the oil can be extracted with hexane, leaving a porous starch matrix. Composites with oil:starch ratios below 0.5:1, when resuspended in water, remain stable at concentrations as low as 0.5%; extraction of oil from such suspensions is possible, but inefficient for complete oil recovery. The rate and extent of extraction varies with concentration of both starch and oil; typically, 8 repetitions of hexane extraction recover less than 50% of the oil from composite solutions with starch concentrations above 1%. |
