Khatun Mst Afifa, Razzak Md, Hossain Md Afzal, Rahman Md Ashikur, Khan Ruhul Amin, Huque Roksana
Food Technology Division, Institute of Food and Radiation Biology, Atomic Energy Research Establishment, Dhaka, Bangladesh.
Institute of Radiation and Polymer Technology, Atomic Energy Research Establishment, Dhaka, Bangladesh.
Curr Res Food Sci. 2020 Dec 16;4:11-17. doi: 10.1016/j.crfs.2020.12.002. eCollection 2021.
This study was conducted with a popular, low price Bangladesh rice variety BRRI Dhan 29 with a view to possible carbohydrate modification targeting lower glycemic index using gamma radiation application. Irradiation process (5 and 10 kGy at a dose rate of 9.74kGy/h) altered amylose content, amylose/amylopectin ratio, swelling power, and solubility index. FTIR spectroscopy confirmed the changed molecular structures due to radiation application. Treatment with a dose of 5 and 10kGy caused increased amylose and amylose/amylopectin ratio significantly (p < 0.02). The highest amylose content was found in 10 kGy irradiated rice (30.20%) compared to unirradiated one (17.27%). Gamma radiation caused decreased swelling and increased water solubility in rice powder. These features of carbohydrate amendment in irradiated rice lead to reduced glycemic index as investigated with the in vivo experiments. Therefore, this study suggests gamma-irradiated rice (10kGy) is beneficial for diabetic subjects keeping lower blood glucose levels.
本研究以一种广受欢迎的低价孟加拉水稻品种BRRI Dhan 29为对象，旨在通过伽马辐射应用，针对降低血糖指数对碳水化合物进行可能的改良。辐照过程（剂量率为9.74kGy/h，剂量为5和10千戈瑞）改变了直链淀粉含量、直链淀粉/支链淀粉比例、膨胀力和溶解性指数。傅里叶变换红外光谱证实了由于辐射应用导致的分子结构变化。5和10千戈瑞剂量的处理显著提高了直链淀粉和直链淀粉/支链淀粉比例（p<0.02）。与未辐照的水稻（17.27%）相比，在10千戈瑞辐照的水稻中发现了最高的直链淀粉含量（30.20%）。伽马辐射导致米粉的膨胀性降低，水溶性增加。如体内实验所研究的，辐照水稻中碳水化合物改良的这些特性导致血糖指数降低。因此，本研究表明伽马辐照水稻（10千戈瑞）有利于糖尿病患者维持较低的血糖水平。
