Physicochemical Properties of Black Rice Flours (BRFs) Affected by Milling Conditions

제분조건에 따른 흑미쌀가루 품질특성

  • Published : 2006.12.31

Abstract

Physicochemical properties of black rice flours (BRFs) produced under different milling conditions were investigated to explore their applications for various processed rice products. Moisture contents of BRFs after roll milling and subsequent hot-air drying or microwave drying were 10.3% and 14.4%, respectively. The BRFs with jet milling and subsequent hot-air drying or microwave drying showed moisture contents of 7.9% and 7.5%. Mean particle sizes of the BRFs obtained from roll milling, jet milling, and following air-classification were 150, 41.5, and 9.4 ${\mu}m$, respectively. Hunter L value and water soluble index (WSI) of BRFs increased with decreasing particle size, while Hunter a value decreased. Total polyphenol contents of 91.4-115.8 mg/100 g and total amino acids of 75.0-96.4 mg/100 g in three types of BRFs were higher as compared to those (6.3 mg/100 g and 30.5 mg/100 g) of polished rice flour (PRF). Physicochemical properties such as moisture content, color parameter, and WSI have close relationship with the particle size of BRFs prepared under different milling conditions.

Keywords

black rice;milling;microwave;polyphenol

References

  1. Choi HC, Oh SK. Diversity and function of pigments in colored rice. Korean J. Crop. Sci. 41: 1-9 (1996)
  2. Kum JS, Lee HY. The effect of the varieties and particle size on the properties of rice flour. Korean J. Food Sci. Technol. 31: 1542-1548 (1999)
  3. Chung YA, Lee JK. Antioxidative properties of phenolic compounds extracted from black rice. J. Korean Soc. Food Sci. Nutr. 32: 948-951 (2003) https://doi.org/10.3746/jkfn.2003.32.6.948
  4. Kim SK, Bang JB. Physicochemical properties of rice affected by steeping conditions. Korean J. Food Sci. Technol. 28: 1026-1032 (1996)
  5. Choi CR, Kim JO, Lee SK, Shin MS. Properties of fractions from waxy rice flour classified with particle size. Food Sci. Biotechnol. 10: 54-58 (2001)
  6. Nam SH, Kang MY. Comparison of inhibitory effect of rice branextracts of the colored rice cultivars on carcinogenesis. Agric. Chem. Biotechnol. 41: 78-83 (1998)
  7. Lee YT, Seog HM, Cho MK. ${\beta}$-Glucan enrichment from pearled barley and milled barley fractions. Korean J. Food Sci. Technol. 29: 888-894 (1997)
  8. Anderson RA. Water absorption and solubility and amylograph characteristics of roll-cooked small grain products. Cereal Chem. 59: 265-271 (1982)
  9. Dey PM, Brinson K. Plant cell walls. Adv. Carbohydr. Chem. Biochem. 42: 265-382(1984) https://doi.org/10.1016/S0065-2318(08)60127-4
  10. Damir AA. Comparative studies on physicochemical properties and micro- structure of raw and parboiled rice. Food Chem. 16: 1-14 (1985) https://doi.org/10.1016/0308-8146(85)90015-9
  11. Ashida K, Iida S, Yasui T. Lack of 26 kDa globulin accompanies increased from amino acid contents in rice (Oryza sativa L.) grains. J. Cereal Sci. 43: 387-392 (2006) https://doi.org/10.1016/j.jcs.2006.01.002
  12. Nishita KD, Bean MM. Grinding methods; Their impact on rice flour properties. Cereal Chem. 59: 46-50 (1982)
  13. Slavin J, Jacobs D, Marquart L. Whole-grain consumption and chronic disease. Prot. Mech. Nutr. Cancer 27: 14-21 (1997) https://doi.org/10.1080/01635589709514495
  14. Lee YT, Seog HM, Cho MK, Kim SS. Physicochemical properties of hull-less barley flours prepared with different grinding mills. Korean J. Food Sci. Technol. 28: 1078-1083 (1996)
  15. AOAC. Official Methods of Analysis of AOAC Int. 16th ed. Association of Official Analytical Chemists, Washington, DC, USA (1995)
  16. Meuser F, Klingler RW, Niediek EK. Characterization of mechanically modified starch. Starch 30: 376-384 (1978) https://doi.org/10.1002/star.19780301105
  17. Kum JS, Lee SH, Lee HY, Kim KH, Kim YI. Effects of different milling methods on physicochemical properties and products. Korean J. Food Sci. Technol. 25: 546-551 (1999)
  18. Kim YJ, Kim SS. Comparison of size distribution of rice flour measured by microscope, sieve, coulter counter, and aerodynamic methods. Korean J. Food Sci. Technol. 24: 184-187 (1994)
  19. Multon JL, Bizot H, Savet B. Water Absorption in Cereal Foods and Water Activity Measurement in Cereals for Food and Beverages. Simatos D (ed). Academic Press Inc., New York, USA. pp. 97-101 (1980)
  20. Choi GC, Na HS, Oh GS, Kim SK, Kim K. Gelatinization properties of waxy black rice starch. J. Korean Soc. Food Sci. Nutr. 34: 87-92 (2005) https://doi.org/10.3746/jkfn.2005.34.1.087