| Resistant starch(RS) is defined as the sum of starch and products of starch de gradation not absorbed in the s mall intestine of healthy individuals. Cassava starch was used as the materials, by different methods, and the processing characteristics were compared to study the influence of the preparation. The results indicated:While the enzymic preparation, thermostable a-amylase has a higher efficiency in the RS yield wit h starch concentration of20%,80℃for10min, and the yield(12.37%) was higher than the pullulan samples(7.03%) by5.34%(both of w hic h higher than the raw starch(1.19%),the amylose content higher by0.73%, freeze-thaw stability higher by28.77%, but the water-holding capacity lower by099.All of these have a significant difference (P<0.01)In the acidic preparation, the yield level was determined by the variety of the acid while the variation deter mined by the preparation pH. The order of the acidic method in yield of RS is:phosphoric acid (PA)-method, lactic acid (LA)-method, citric acid (CA)-method. The PA-method has a higher yield than the samples in the same pH by2.46%. There was not a significant difference between the CA-method and the LA-method in yield (9.96%&10.09%)and amylose content (26.57%&26.58%), but in a significant difference (P<0.01) were in freeze-thaw stability and water-holding capacity.KCl-system is suitable for improving the yield of RS while CaCl2-system is suitable for improving the processing characteristics, with the amylose content higher by9.02%and2.84%, freeze-thaw stability higher by5.6%and8.85%, and the water-holding capacity higher by0.39and0.22, than the other2methods. The water-holding capacity of the RS in NaCl-system(10.81) and KCl-system(10.98) didn’t have a significant difference (P>0.05)The order of the soluble sugar system in yield of RS is:maltose, sucrose, and glucose system. The amylose content of the RS in glucose system is higher than the others by1.22%and0.99%. The RS inmaltose has a best freeze-thaw stability, but a lower water-holding capacity than the others by3.4and3.8. |
PDF Full Text Request