National Starch and Chemical Investment Holding Corporation

Leo Walsh

Daniel B Solarek

James L Eden

James J Kasica

Norman L Lacourse

Morton W Rutenberg

Timothy G Koubek

A steam-stripping process suitable for the removal of impurities from polysaccharides, including soluble starch hydrolysates, is disclosed herein. This process may be used in combination with other purification processes, such as ultrafiltration, ion exchange, treatment with activated carbon, as well as bleaching process. Soluble starch hydrolysates may also be purified by a combination of ultrafiltration or activated carbon treatment and bleaching. In these processes, the polysaccharide or the soluble starch hydrolysate produced is bland in flavor, free of off-odor, optionally, lighter or white in color and suitable for use in systems requiring these characteristics. Other purification process combinations which are disclosed for removal of undesirable flavors, odors and/or colors from polysaccharides include: 1) ultrafiltration and carbon treatment; 2) ultrafiltration and steam-stripping; 3) steam-stripping and carbon treatment; 4) ion exchange treatment and ultrafiltration; 5) ion exchange treatment and steam-stripping; and 6) ion exchange treatment and carbon treatment. A bleaching process may precede any of these processes. If ozone or a peroxide is employed, the bleaching step may follow any of these processes. Any of the processes may be combined with other processes disclosed herein to provide additional purification measures. The processes are particularly useful for purification of low molecular weight soluble polysaccharide hydrolysates, such as dextrins. These purified polysaccharides are used in improved foods, adhesives, pharmaceuticals and like products.

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Plainsboro, NJ, United States of America

Leo Walsh