Yamazaki Tetsuya, Katsumi Naoya, Fujita Naoko, Matsumoto Kenji, Okazaki Masanori, Miwa Shoji, Honda Yuji
1 Faculty of Bioresources and Environmental Science, Ishikawa Prefectural University.
2 Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University.
J Appl Glycosci (1999). 2016 Aug 20;63(3):61-68. doi: 10.5458/jag.jag.JAG-2016_005. eCollection 2016.
We investigated the physicochemical properties of starches from rhizomes of two lotus ( Gaertn.) cultivars, Shinashirobana cultivar and Kanasumi-line No. 20, harvested at the same farm in Japan. A rapid visco analyser analysis indicated that pasting temperatures of the starches from Shinashirobana cultivar and Kanasumi-line No. 20 were 62.1 and 66.5 °C, respectively, and the peak viscosities of the starch of both lotuses were similar 244 and 240 RVU, respectively. The starch from the Kanasumi-line No. 20 at 60 °C had low viscosity, 16.2 mPa∙s, but the starch from Shinashirobana cultivar had higher viscosity, 2,720 mPa∙s, at 60 °C. The onset and peak temperatures of the differential scanning calorimetry (DSC) curve of the starch from Shinashirobana cultivar were 4-5 °C lower than those of the starch from Kanasumi-line No. 20, although both exhibited similar values (13.4 and 11.6 J/g). The distribution patterns of the branched chain lengths of amylopectin in the two starches indicated that the rate of low-degree of polymerization (DP 5-12) of all branched chains was higher for the starch from Shinashirobana cultivar than that for the starch from Kanasumi-line No. 20. These results suggest that the increased rate of DP 5-12 in the starch from Shinashirobana cultivar is related to the higher viscosity of the starch.
我们研究了来自日本同一农场收获的两个莲花（莲属）品种根茎淀粉的理化性质，即白城花品种和霞住20号线品种。快速粘度分析仪分析表明，白城花品种和霞住20号线品种淀粉的糊化温度分别为62.1℃和66.5℃，两种莲花淀粉的峰值粘度相似，分别为244和240 RVU。霞住20号线品种在60℃时淀粉粘度较低，为16.2 mPa∙s，但白城花品种淀粉在60℃时粘度较高，为2720 mPa∙s。白城花品种淀粉的差示扫描量热法（DSC）曲线的起始温度和峰值温度比霞住20号线品种淀粉低4-5℃，尽管两者的值相似（13.4和11.6 J/g）。两种淀粉中支链淀粉支链长度的分布模式表明，白城花品种淀粉所有支链的低聚合度（DP 5-12）比例高于霞住20号线品种淀粉。这些结果表明，白城花品种淀粉中DP 5-12比例的增加与淀粉的较高粘度有关。
