Studies on the Preservation of Korean Rice by Gamma-irradiation (III) On disinfection of rice by gamma-ray irradiation

감마선 조사에 의한 쌀 저장에 관한 연구(제 3 보)

  • Kim, Hyong-Soo (Food Tech. Div., Radiation Research Institute in Agriculture, Office of Atomic Energy) ;
  • Choi, Yong-Rack (Food Tech. Div., Radiation Research Institute in Agriculture, Office of Atomic Energy) ;
  • Kim, Sung-Kih (Food Tech. Div., Radiation Research Institute in Agriculture, Office of Atomic Energy) ;
  • Harn, In-Ja (Food Tech. Div., Radiation Research Institute in Agriculture, Office of Atomic Energy)
  • 김형수 (원자력청 방사선농학연구소 식품공학 연구실) ;
  • 최영락 (원자력청 방사선농학연구소 식품공학 연구실) ;
  • 김성기 (원자력청 방사선농학연구소 식품공학 연구실) ;
  • 한인자 (원자력청 방사선농학연구소 식품공학 연구실)
  • Published : 1970.06.28

Abstract

For the purpose of disinfection and efficient storage, Korean Paldal variety rice was hulled into the unpolished and polished ones and packed in the kraft paper bags, irradiated with relatively high doses, 500, 800, and 1,000 krad from the $CO^{60}$ source and stored at room temperature, a variety of changes were observed as follows. 1) With 1,000 krad irradiation, mold was almost sterilized. 2) Fat acidity increased during storage and continued to increase more with increased doses. 3) The content of riboflavin eras severely reduced with higher doses. 4) The results of organoleptic test were featured by a yellow color and a keen irradiation odor appearing in the boiled rice. 5) In the irradiated rice starch with 3,000 krad, hydrolysis with ${\alpha}$-amylase was not effective while accelerated with diastase.

한국산 벼(팔달)를 현미와 백미로 도정하여 kraft paper bag에 넣고 살균하여 저장할 목적으로 비교적 높은 선량인 500. 800, 1,000 krad의 감마선 ($Co^{60}$)을 조사하여 실온에 저장하면서 그 품질변화에 관하여 몇 가지 결과를 얻었기에 보고하는 바이다. (1) 1.00krad의 감마선 조사로 곰팡이는 현저하게 살균되었다. (2) Fat acidity는 조사량의 증가에 따라 계속 증가하였다. (3) Riboflavin의 함량은 $500{\sim}l,000\;krad$ 조사로 현저하게 파괴되었다. (4) 식미시험에 있어서 밥의 빛깔이 황색을 띠고 조사취가 현저하였다. 5) 3,000 krad를 조사한 쌀 전분은 bacterial amylase에 의해서 분해가 저해되었고, diastase에 의해서는 분해가 촉진되는 경향이었다.

Keywords