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In vitro Starch Hydrolysis Indices of selected Sri Lankan Starchy Tubers

Authors:

U.G.S.A. Gamage,

Rajarata University of Sri Lanka, LK
About U.G.S.A.

Department of Animal and Food Sciences;Faculty of
Agriculture;Rajarata University of Sri Lanka

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D.W.M.M.M. Kumari,

Rajarata University of Sri Lanka, LK
About D.W.M.M.M.
Department of Animal and Food Sciences;Faculty of
Agriculture;Rajarata University of Sri Lanka
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R.M.I.S.K. Senavirathna,

Rajarata University of Sri Lanka
About R.M.I.S.K.
Department of Biochemistry;Faculty of Medicine and Allied Sciences;Rajarata University of Sri Lanka;Sri Lanka
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D Rathish

Rajarata University of Sri Lanka, LK
About D
Department of Pharmacology;Faculty of Medicine and Allied Sciences; Rajarata University of Sri Lanka
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Abstract

Purpose: The importance of glycaemic indices (GI) of starchy foods originates from its linkage with type 2 diabetes mellitus. GI of food items is measured by in vivo method which carries a degree of discomfort. We aim to find the in vitro hydrolysis index (HI) of selected starchy tubers in Sri Lanka. Research Method: The degree of hydrolysis for selected tubers was determined by in vitro starch digestion using the proportion of starch converted into maltose. The HI values of six selected tubers were calculated using the ratio between incremental areas under the hydrolysis curve for the tested tubers and the reference food (white bread). Findings: Among the selected tubers, arrowroot had the highest percentage of hydrolysis within the fi rst 30 minutes. There was a signifi cant diff erence in the percentage of hydrolysis between 60-90 minutes for the selected tubers and white bread. The HI for arrowroot, cassava, potato, purple yam, sweet potato and white yam were 84 ± 6, 114 ± 9, 89 ± 10, 74 ± 4, 104 ± 7 and 69 ± 7 respectively. Originality/Value: The HI of the selected Sri Lankan starchy tubers will be of value in future large-scale studies on traditional tubers and to predict the GI of the starchy tubers
How to Cite: Gamage, U.G.S.A., Kumari, D.W.M.M.M., Senavirathna, R.M.I.S.K. and Rathish, D., 2021. In vitro Starch Hydrolysis Indices of selected Sri Lankan Starchy Tubers. Journal of Agricultural Sciences – Sri Lanka, 16(2), pp.237–246. DOI: http://doi.org/10.4038/jas.v16i2.9329
Published on 01 May 2021.
Peer Reviewed

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