化学
淀粉
结晶度
抗性淀粉
延伸率
聚合度
聚合
食品科学
生物化学
有机化学
结晶学
聚合物
材料科学
极限抗拉强度
冶金
作者
Bo Kyung Kim,Hye In Kim,Tae Wha Moon,Soo Jung Choi
标识
DOI:10.1016/j.foodchem.2013.11.145
摘要
Starches with high slowly digestible starch (SDS) contents were prepared by treating completely gelatinized waxy corn starch with amylosucrase. The structural properties of the prepared starches were then investigated. The content of SDS increased by up to 38.7% after amylosucrase modification, and the portion of chains with degree of polymerisation (DP) 25–36 increased, while the portion of chains with DP ⩽ 12 decreased. Amylosucrase-modified starches showed a weak B-type crystalline structure. A slight increase in the degree of relative crystallinity was observed with increased reaction time. The thermal properties, including melting temperature and enthalpy, of the amylosucrase-modified starches were higher than for the control starch. Although the amylosucrase-modified starches showed varying structural properties according to reaction time (1–45 h), their digestibilities did not change much after 6 h. By controlling the reaction time of the amylosucrase treatment, a tailored starchy food containing the desired amount of SDS can be produced.
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