Postgraduate Institute of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka; Food Research Unit, Department of Agriculture, Peradeniya, Sri Lanka.
Department of Food Science and Technology, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka.
Food Res Int. 2022 Jul;157:111389. doi: 10.1016/j.foodres.2022.111389. Epub 2022 May 21.
Thirty-two traditional and newly improved pigmented and non-pigmented rice varieties were evaluated for their eating and cooking quality and dietary fiber (DF) content. Seasonal variability of DF content, in-vitro starch digestion rate (DR) and expected glycemic index (eGI) were evaluated using selected representative samples. Rice varieties were categorized either high or intermediate amylose content but with hard, medium or soft gel consistency. Average insoluble dietary fiber (IDF) and soluble dietary fiber (SDF) content ranged between 1.13-6.76% and 0.03-1.00%, respectively. Pigmented rice reported significantly higher IDF content compared to non-pigmented rice and also showed a significant statistical correlation (r > 0.56, P < 0.01) between IDF and pigmentation. There was no seasonal variation observed in rice DF content between two cropping seasons. Pigmented rice varieties showed significantly lower (P < 0.05) starch digestibility and glycemic index values (DR:58.8-66.5; eGI:71.9-76.2) than non-pigmented rice (DR:69.1-71.5; eGI:77.6-79.0). Pigmented rice showed significantly higher negative correlation (r > -0.68, P < 0.01) with DR.
三十二种传统和新改良的有色和无色稻米品种，对其食用和烹饪品质以及膳食纤维（DF）含量进行了评估。使用选定的代表性样本评估了 DF 含量、体外淀粉消化率（DR）和预期血糖指数（eGI）的季节性变化。稻米品种可分为高或中直链淀粉含量，但具有硬、中或软胶凝度。不溶性膳食纤维（IDF）和可溶性膳食纤维（SDF）的平均含量分别在 1.13-6.76%和 0.03-1.00%之间。有色稻米的 IDF 含量明显高于无色稻米，且 IDF 与色素之间存在显著的统计学相关性（r>0.56，P<0.01）。两个种植季节之间，稻米 DF 含量没有观察到季节性变化。有色稻米品种的淀粉消化率和血糖指数值（DR：58.8-66.5；eGI：71.9-76.2）明显低于无色稻米（DR：69.1-71.5；eGI：77.6-79.0）（P<0.05）。有色稻米与 DR 呈显著负相关（r>-0.68，P<0.01）。
