Surface derivatization of corn starch granules
1998
Whistler, R.L. | Madson, M.A. | Zhao, J. | Daniel, J.R.
Commercial corn starch, treated with stearoyl chloride in carbon tetrachloride a nd triethylamine, is surface-derivatized without noticeable swelling. Granules t hat are reacted with chloroacetic acid under similar conditions undergo surface etherification, visibly identified by their color binding with fuchsin. Interest ingly, the dye experiment indicates surface-derivatization as well as derivatiza tion of the granule central interior, suggesting reagent penetration to the gran ule interior through pores and derivatization of a lower density porous center. Esterification of corn starch granules treated with glucoamylase have five times greater esterification than normal corn starch granules. Placed in water, these and palmitoylated granules have a fatty feel to the fingers. Stearoylated corn and amaranth starches showed indications for use as fat replacers in frozen dess erts.
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