期刊
BIORESOURCE TECHNOLOGY
卷 99, 期 14, 页码 6360-6364出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2007.11.076
关键词
activated carbon; adsorption; Freundlich isotherm; thermal effects; zein decolorization/deodorization
The Freundlich model was evaluated for use to assess the effect of heat on the adsorption capacity of an activated carbon for decolorizing/deodorizing corn zein. Because zein protein and its color/odor components are all adsorbed by activated carbon, a method to monitor their removal was needed. Yellow color is due to xanthophylls; a contributor to off-odor is diferuloylputrescine. The off-odor component absorbs ultraviolet (UV) light at about 325 nm and its removal coincides with removal of yellow color. A spectrophotometric method based on UV absorbances 280 nm for protein and 325 nm for the off-odor component was used to monitor their adsorptions onto activated carbon. Equilibrium studies were performed over temperature range from 25 to 60 degrees C for zein dissolved in 70% aqueous ethanol. Runs made at 55 degrees C adsorbed significantly more of the color/odor components than the protein. Published by Elsevier Ltd.
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