Glycemic Index (GI) of six common rice varieties in the local markets of Bangladesh was assessed and categorized in this study to investigate manipulative varietal performance for the time being. After overnight fasting, each of ten selected healthy non-diabetic volunteers (males and females in ratio of 1:1) was fed with reference food (50 g glucose) and test foods (50 g carbohydrate-containing different rice varieties) in every two days intervals. After feeding, glucose levels (mmol/l) were measured at 0, 15, 30, 45, 60, 90 and 120 minutes. Incremental Area Under Curve (IAUC) of reference food and test food (avoiding the area beneath the baseline of reference food) was calculated to measure GI values. Amylose content (%) of different test foods was measured from the standard curve obtained from the spectrophotometric analysis after alcoholic-alkaline gelatinization that was followed by acidification and iodine mixing. The result showed that the GI values were 59.7±3.4; 50.5±2.6; 57.8±2.8; 51.3±2.3; 56.9±3.9 and 44.6±2.1, while the amylose content (%) were 23.6±0.6; 26.7±0.9; 21.3±0.7; 28.3±1.1; 22.2±2.3 and 29.8±1.5 for Nizershail, BRRI Dhan 29, Chinigura, Kalijira, Hybrid Hera Dhan 12 and Sworna, respectively. Moreover, the existing inverse relationship between the GI values and amylose content in this study was similar to other researchers’ findings. Categorization of the test foods based on the observed GI values ranked Sworna, BRRI Dhan 29 and Kalijira as low GI rice varieties that could be beneficial for consumption by diabetics as well as healthy individuals.
Bhonsle SJ, Sellappan K. 2010. Grain quality evaluation of traditionally cultivated rice varieties of Goa, India. Receant Res Sci Technol 2:88‒97.
Bhupathiraju SN, Tobias DK, Malik VS, Pan A, Hruby A, Manson JE, Willett WC, Hu FB. 2014. Glycemic index, glycemic load and the risk of type 2 diabetes: Results from 3 large US cohorts and an updated meta-analysis. Am J Clin Nutr 100(1):218‒232. https://doi.org/10.3945/ajcn.113.079533.
Brouns F, Bjorck I, Frayn KN, Gibbs AL, Lang V, Slama G, Wolever TM. 2005. Glycemic index methodology. Nutr Res Rev 18(1):145‒171. https://doi.org/10.1079/NRR2005100.
Duan DX, Donner E, Liu Q, Smith DC, Ravenelle F. 2012. Potentiometric titration for determination of amylose content of starch ‒ A comparison with the colorimetric method. Food Chem 130(4):1142‒1145. https://doi.org/10.1016/j.foodchem.2011.07.138.
[FAO/WHO] Food Agriculture Organization/ World Health Organization. 1998. Carbohydrates in human nutrition. Report of a joint FAO/WHO expert consultation. FAO Food Nutr 66:1‒140.
[FAO Newsroom] Food Agriculture Organization Newsroom. 2004. Rice is life. Food and Agricultural Organization of the United Nations, Rome, Italy. http://www.fao.org/newsroom/en/focus/2004/36887/index.html [Accessed 12th February 2020].
GI Newsletter. 2019. “About glycemic index.” Boden institute of obesity, nutrition, exercise and eating disorders and charles perkins centre at the university of Sydney. The University of Sydney. http://www.glycemicindex.com/about.php [Accessed 7th January 2021].
Hewson-Hughes AK, Gilham MS, Upton S, Colyer A, Butterwick R, Miller AT. 2011. The effect of dietary starch level on postprandial glucose and insulin concentrations in cats and dogs. Br J Nutr 106(S1):105‒109. https://doi.org/10.1017/S0007114511001887.
Hong J, Zeng XA, Buckow R, Han Z. 2018. Structural, thermodynamic and digestible properties of maize starches esterified by conventional and dual methods: Differentiation of amylose contents. Foods Hydrocoll 83:419‒429. https://doi.org/10.1016/j.foodhyd.2018.05.032.
Jeevetha S, Nisak MYB, Ngan HB, Ismail A, Azlan A. 2014. Relationship between amylose content and glycemic index of commonly consumed white rice. IOSR Journal of Agriculture and Veterinary Science 7(9):12‒18. doi:10.9790/2380-07931218.
Jenkins DJ, Wolever TM, Taylor RH, Barker H, Fielden H, Baldwin JM, Bowling AC, Newman HC, Jenkins Al, Goff DV. 1981. Glycemic index of foods: A physiological basis for carbohydrate exchange. Am J Clin Nutr 34(3):362‒366. https://doi.org/10.1093/ajcn/34.3.362.
Jung EY, Suh HJ, Hong WS, Kim DG, Hong YH, Hong IS, Chang UJ. 2009. Uncooked rice of relatively low gelatinization degree resulted in lower metabolic glucose and insulin responses compared with cooked rice in female college students. Nutr Res 29(7):457‒461. https://doi.org/10.1016/j.nutres.2009.07.002.
Kaur B, Ranawana V, Henry J. 2016. The glycemic index of rice and rice products: A review, and table of GI values. Crit Rev Food Sci Nutr 56(2):215‒236. https://doi.org/10.1080/10408398.2012.717976.
Li N, Guo Y, Zhao S, kong J, Qiao D, Lin L, Lin Q, Zhang B. 2020. Amylose content and molecular-order stability synergistically affect the digestion rate of indica rice starches. Int J Biol Macromol 144:373‒379. https://doi.org/10.1016/j.ijbiomac.2019.12.095.
Meera K, Smita M, Haripriya S, Sen S. 2019. Varietal influence on antioxidant properties and glycemic index of pigmented and non-pigmented rice. J Cereal Sci 87:202‒208. https://doi.org/10.1016/j.jcs.2019.03.005.
Pathiraje PMHD, Madhujith WMT, Chadrasekara A, Nissanka SP. 2010. The effect of rice variety and parboiling on in vivo glycemic response. Tropical Agricultural Research 22(1):26‒33.
Pinhero RG, Waduge RN, Liu Q, Sullivan JA, Tsao R, Bizimungu B, Yada RY. 2016. Evaluation of nutritional profiles of starch and dry matter from early potato varieties and its estimated glycemic impact. Food Chem 203:356‒366. https://doi.org/10.1016/j.foodchem.2016.02.040.
Ranawanna DV, Henry CJK, Lightowler HJ, Wang D. 2009. Glycemic index of some commercially available rice and rice products in Great Britain. Int J Food Sci Nutr 60(Supp 4):99‒110. https://doi.org/10.1080/09637480802516191.
Saez-Plaza P, Michalowski T, Navas MJ, Asuero AG, Wybraniec S. 2013. An overview of the Kjeldahl method of nitrogen determination. Part 1. Early history, chemistry of the procedure and the titrimetric finish. Crit Rev Anal Chem 43(4):178‒223. https://doi.org/10.1080/10408347.2012.751786.
Safita N, Islam SMS, Chow CK, Niessen L, Lechner A, Holle R, Laxy M. 2016. The impact of type 2 diabetes on health related quality of life in Bangladesh: Results from a matched study comparing treated cases with non-diabetic controls. Health Qual Life Outcomes 14(1):129. https://doi.org/10.1186/s12955-016-0530-7.
Saquib N, Saquib J, Ahmed T, Khanam MA, Cullen MR. 2012. Cardiovascular diseases and type 2 diabetes in Bangladesh: A systematic review and meta-analysis of studies between 1995 and 2010. BMC Public Health 12(1):434. https://doi.org/10.1186/1471-2458-12-434.
Swetha S. 2019. Which rice is best for a diabetic? Glycemic index analysis (part-1). Upgrade my food: making food fast healthy and fun. https://www.upgrademyfood.com/which-rice-is-best-for-a-diabetic-glycemic-index-analysis-part-1/ [Accessed 1st January 2019].
Wang S, Li C, Copeland L, Niu Q, Wang S. 2015. Starch retrogradation: A comprehensive review. Compr Rev Food Sci Food Saf 14(5):568‒585. https://doi.org/10.1111/1541-4337.12143.
Xu J, Kuang Q, Wang K, Zhou S, Wang S, Liu X, Wang S. 2017. Insights into molecular structure and digestion rate of oat starch. Food Chem 220:25‒30. https://doi.org/10.1016/j.foodchem.2016.09.191.