Studies on the Preservation of Korean Rice by Gamma-radiation (IV) -On the free amino acids contents in gamma-irradiated rice-

감마선 조사에 의한 쌀저장에 관한 연구 (제 4 보) - 감마선 조사쌀의 유리 아미노산 함량에 관하여 -

The Korean rice of Paldal variety was milled, in March, 1969, into brown rice and 92% polished one and each 1.5kg sample was packed in the kraft paper bags. With Co-60 gamma-irradiation, the samples were treated in the various ranges of 500, 800 and 1,000 Krad, and then they were stored at the room temperature. The changes of the contents of free amino acids in the samples were determined by the amino acid autoanalyzer (Yanagimoto, Japan, LC-type). The results obtained in June and October of the year were as follows. 1) In the disinfecting irradiation of rice by the higher doses of 500, 800 and 1,000 Krad, there wasn't any particular distinction between the control lot and irradiated lot in respect to the free amino acid contents. 2) The contents of free amino acids in rice during storage had the decreasing tendencies, and especially prominent in case of glutamic acid.

경기도 수원 지방에서 수확한 벼 팔달 품종을 1969년 3월에 현미와 백미로 표준도정하여 kraft paper bag에 1.5kg식 포장하여 Co-60 감마선 조사기로 500, 800, 1,000 Krad를 조사한 후 실온에 저장하면서 6월과 10월에 쌀중의 유리아미노산 함량을 amino acid autoanalyzer (Yanogimoto. LC-5)로 분석한 결과는 다음과 같다. 1) 쌀의 감마선 조사에 있어서 비교적 고선량인 500, 800, 1,000 Krad의 조사로도, 대조구과 조사구간에 유리 아미노산 함량은 별로 차이를 볼 수 없다. 2) 쌀중의 유리 아미노산 함량은 저장중 감소경향이고 특히 glutamic acid가 현저하다.