In Vitro Digestibility of Rice and Barley in Forms of Raw Flour and Cooked Kernels

  • Han, Jung-Ah (Division of Human Environmental Sciences, Sangmyung University) ;
  • Jang, Su-Hae (School of Life Sciences and Biotechnology, Korea University) ;
  • Lim, Seung-Taik (School of Life Sciences and Biotechnology, Korea University)
  • Published : 2008.02.29

Abstract

Digestion properties of 3 types of cereals, white rice, brown rice, and barley, were measured after cooking or grinding. Regardless of the processing methods, white rice showed the highest rate and the greatest extent of digestion, whereas barley showed the lowest values. During the early digestion period, cooked white rice kernels had a larger k (kinetic constant) value than uncooked white rice flour, indicating that cooking induced faster digestion than grinding. In the case of brown rice and barley, the cell wall in cooked kernels remained intact and resulted in a lower k values than those of uncooked flour. However, after 3 hr of digestion, the total digestion extent was greater for the cooked brown rice and barley than that for uncooked flours. The high content of slowly digestible starch (SDS) in cooked brown rice and barley might be due to the starch fraction which was protected by the cell wall. The resistant starch (RS) content, however, was greater for the uncooked flours than that for cooked kernels. The cooked kernels of 3 cereal samples tested showed higher glycemic index (GI) values than the uncooked flours.

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References

  1. Englyst HN, Hudson GJ. The classification and measurement of dietary carbohydrates. Food Chem. 57: 15-21 (1996) https://doi.org/10.1016/0308-8146(96)00056-8
  2. Han J-A, BeMiller JN. Preparation and physical characteristics of slowly digesting modified food starches. Carbohyd. Polym. 67: 366- 374 (2007) https://doi.org/10.1016/j.carbpol.2006.06.011
  3. Chun S-Y, Kim H-I, Yoo B. Effect of gum addition on the rheological properties of rice flour dispersions. Food Sci. Biotechnol. 15: 589-594 (2006)
  4. Holm J, Björck I, Asp N-T, Sjöberg L-B, Lundquist I. Starch availability in vitro and in vivo after flaking, steam-cooking, and popping of wheat. J. Cereal Sci. 3: 193-206 (1985) https://doi.org/10.1016/S0733-5210(85)80013-8
  5. Englyst HN, Kingman SM, Cummings HJ. Classification and measurement of nutritionally important starch fractions. Eur. J. Clin. Nutr. 46: S33-S50 (1992)
  6. Granfeldt Y, Lijeberg H, Drews A, Newman R, Björck I. Glucose and insulin responses to barley products: Influence of food structure and amylose-amylopectin ratio. Am. J. Clin. Nutr. 59: 1075-1082 (1994) https://doi.org/10.1093/ajcn/59.5.1075
  7. Chung H-J, Lim HS, Lim S-T. Effect of partial gelatinization and retrogradation on the enzymatic digestion of waxy rice starch. J. Cereal Sci. 43: 353-359 (2006) https://doi.org/10.1016/j.jcs.2005.12.001
  8. Goni I, Garcia-Alonso A, Saura-Calixto F. A starch hydrolysis procedure to estimate glycemic index. Nutr. Res. 17: 427-437 (1997) https://doi.org/10.1016/S0271-5317(97)00010-9
  9. Lee JS, Shin HK. Correlation between glycemic index and in vitro starch hydrolysis of cereals. Korean J. Food Sci. Technol. 30: 1229- 1235 (1998)
  10. Lee Y-T, Chang H-G. The effect of heat treatments on in vitro starch digestibility and resistant starch of selected cereals. Food Sci. Biotechnol. 13: 810-813 (2004)
  11. Hoseney RC. Minor constituents of cereals. pp. 81-101. In: Principles of Cereal Science and Technology. 2nd ed. American Association of Cereal Chemists, St. Paul, MN, USA (1994)
  12. Yoo M-S, Lee Y-T. Pasting properties of crude ${\beta}$-glucan from spent brewer's yeast on wheat flour and starch. Food Sci. Biotechnol. 16: 485-488 (2007)