Textural Characteristics and Bacterial Reduction in Glutinous Rice and Brown Rice Pretreated with Ultra-High Pressure

초고압 전처리한 찹쌀과 현미의 텍스처 특성과 세균 저감 효과

  • Received : 2015.11.01
  • Accepted : 2016.01.01
  • Published : 2016.02.29


Ultra-high pressure (UHP) was applied to glutinous rice (Dongjin) and brown rice (Shindongjin) to determine its effects on the textural characteristics of cooked rice and bacterial reduction in uncooked rice. Hardness and stickiness of the cooked glutinous and brown rice pretreated with 500 MPa for 5 min were significantly attenuated compared to that of the control rice (p<0.05). After the UHP treatment, particles of the glutinous and brown rice were observed to be finer when cross sections of the rice were analyzed using field emission scanning electron microscope. The total bacterial count in the brown rice treated with 600 MPa for 5 min was reduced from $10^7CFU/g$ to $10^4CFU/g$, while the number of thermoduric bacteria in the brown rice was not significantly different after the UHP treatment. These results suggest that UHP may be an effective method for improving texture of dried rice and to reduce bacterial count in raw rice.


ultra-high pressure;rice;hardness;stickiness;sterilization


  1. Koo SY, Cha KH, Lee DU. Effects of high hydrostatic pressure on foods and biological system. Food Sci. Ind. 40: 23-30 (2007)
  2. Lee SJ. Effects of high hydrostatic pressure on physicochemical properties of waxy rice starch. Korean J. Food Nutr. 24: 602-606 (2011)
  3. Cheon KC, Kim KJ, Ha YC, Baik MY, Chang YI, Chang KS. Effect of high pressure on the crystalline structure of waxy and non-waxy rice starch Food Eng. Prog. 1: 184-191 (1997)
  4. Shigematsu T, Hayashi M, Nakajima K, Uno Y, Sakano A, Murakami M, Narahara Y, Ueno S, Fujii T. Effects of high hydrostatic pressure on distribution dynamics of free amino acids in water soaked brown rice grain. J. Phys. Conf. Ser. 215: 1-4 (2010)
  5. Kwon SM, Kim CM, Kim YH. Biological characteristics of instant rice treated with high hydrostatic pressure. Food Sci. Ind. 40: 31-35 (2007)
  6. Kim YJ, Lee EJ. Application of hydrostatic pressure techniques on the meat products. Food Sci. Ind. 40: 36-40 (2007)
  7. Cho HY, Cho EK, Kim BC, Shin HH. Baby food processing and properties by using high pressure processing. Korean J. Food Nutr. 24: 746-752 (2011)
  8. Cho HY, Cho EK, Kim BC, Shin HH. Development of semisolid apple baby food using high pressure processing and quality evaluation. Korean J. Food Nutr. 24: 777-785 (2011)
  9. Choi DW, Kim JB, Yoo MS, Pyun YR. Kinetics of thermal softening of Chinese cabbage tissue. Korean J. Food Sci. Technol. 19: 515-519 (1987)
  10. Ogawa Y, Glenn GM, Orts WJ, Wood DF. Histological structures of cooked rice grain. J. Agr. Food Chem. 51: 7019-7023 (2003)
  11. Rewthong O, Soponronnarit S, Taechapairoj C, Tungtrakul P, Prachayawarakorn S. Effects of cooking, drying and pretreatment methods on texture and starch digestibility of instant rice. J. Food Eng. 103: 258-264 (2011)
  12. Lee EJ, Kim JS, Oh SW, Kim YJ. The resistance of Bacillus subtilis in makgeolli to hydrostatic pressure. Korean J. Food Sci. Technol. 44: 312-316 (2012)
  13. Lim SB, Kim BO, Kim SH, Mok CY, Park YS. Quality changes during storage of kochujang treated with heat and high hydrostatic pressure. J. Korean Soc. Food Sci. Nutr. 30: 611-616 (2001)
  14. Lee SH. Advances in food preservation technology using high pressure. Food Sci. Ind. 46: 42-48 (2013)
  15. Chung YK. Inactivation of bacterial spores by high pressure and food additive combination. J Life Sci. 21: 1094-1099 (2011)
  16. Kim BK, Hong KP, Park JY. Improvement in storage stability of danmooji (salted radish) by high hydrostatic pressure and heat treatment. Korean J. Food Sci. Technol. 30: 132-138 (1998)
  17. Gou JY, Zou YY, Choi GP, Park YB, Ahn JH. Effect of high pressure processing on the shelf life of seasoned squid. J. Korean Soc. Food Sci. Nutr. 40: 1136-1140 (2011)