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  • Title: A comparative study of dietary fiber content, In vitro starch digestibility and cooking quality characteristics of pigmented and non-pigmented traditional and improved rice (Oryza sativa L.).
    Author: Rebeira SP, Prasantha BDR, Jayatilake DV, Dunuwila GR, Piyasiri CH, Herath HMKWP.
    Journal: Food Res Int; 2022 Jul; 157():111389. PubMed ID: 35761645.
    Abstract:
    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.
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