Influence of molecular structure on physicochemical properties and digestibility of normal rice starches.
Influence of molecular structure on physicochemical properties and digestibility of normal rice starches.
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DOI：
10.1016/j.ijbiomac.2015.02.054
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发表时间：
2015-06
影响因子：
8.2
通讯作者：
Su-Yeon You;Sea-Kwan Oh;Hyun-Seok Kim;Hyun‐Jung Chung
中科院分区：
文献类型：
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作者：
Su-Yeon You;Sea-Kwan Oh;Hyun-Seok Kim;Hyun‐Jung Chung
从韩国6个不同水稻品种中分离出普通水稻淀粉，对其分子结构、晶体结构和体外消化率进行了研究。淀粉表观直链淀粉含量以朱南最高（25.5%），Hopum最低（22.4%）。Hiami品种淀粉的直链淀粉和支链淀粉分子量、支链淀粉平均链长、短链比例（DP 6 ~ 12）和长链比例（DP≥37）最低。1047/1022的相对结晶度和结晶率分别为30.2 ~ 36.7%和0.638 ~ 0.652。Hiami的糊化温度最低，糊化焓最高。Hiami的膏体温度最高（92.1℃），回撤度最低（515 cP），最终粘度为876 cP，而Hanareum的膏体温度最低（82.7℃），回撤度最高（1002 cP），最终粘度为1580 cP。快速消化淀粉（RDS）、慢消化淀粉（SDS）和抗性淀粉（RS）含量分别为43.9% ~ 53.5%、35.5 ~ 52.6%和0.5 ~ 15.6%。其中，君南品种RDS含量最低，海美品种RDS含量最高。哈纳兰（16.2%）和博兰婵（14.5%）的RS含量显著高于其他普通水稻品种（3.0 ~ 6.5%）。
Normal rice starches were isolated from six different rice varieties grown in Korea and their molecular structure, crystalline structure, andin vitrodigestibility were investigated. Apparent amylose content was the highest in starch from Junam cultivar (25.5%) and lowest in Hopum (22.4%). Starch from Hiami cultivar had the lowest molecular weights of amylose and amylopectin, average amylopectin chain length, proportion of short chains (DP 6–12), and proportion of long chains (DP ≥ 37) among the tested rice starches. The relative crystallinity and ratio of 1047/1022 ranged from 30.2 to 36.7% and from 0.638 to 0.652, respectively. Hiami had the lowest gelatinization temperatures and the highest gelatinization enthalpy. Hiami had the highest pasting temperature (92.1 °C), the lowest setback (515 cP) and final viscosity (876 cP), whereas Hanareum had the lowest pasting temperature (82.7 °C), the highest setback (1002 cP), and final viscosity (1580 cP). The rapidly digestible starch (RDS), slowly digestible starch (SDS), and resistant starch (RS) content ranged from 43.9–53.5%, 35.5–52.6%, and 0.5–15.6%, respectively. The Junam cultivar had the lowest RDS content, whereas Hiami had the highest RDS content. The RS content of Hanareum (16.2%) and Boramchan (14.5%) was significantly higher than that of other normal rice cultivars (3.0–6.5%).