Radurization of the Microorganisms Contaminated in Chicken

닭고기에 오염(汚染)된 미생물(微生物)의 감마선(線) 살균(殺菌)

This study was intended to develop a sanitary and economic storage method using gamma irradiation for chicken. The samples, which were irradiated with doses of 0, 5, 8 and 10 kGy and stored at 3 to $4^{\circ}C$ for 41 days, were subjected to an investigation of the sterilizing effect on microorganisms. In the number of microorganisms contaminated, psychrotrophiles, mesophiles and thermophiles were $7.8{\times}10^5,\;3.6{\times}10^5$ and $1.1{\times}10^3$ per gram of the samples, respectively, and yeast & mold and coliform group were $3.0{\times}10^3$ and $2.1{\times}10^3$ per gram of the samples, respectively. Also, other enteric bacilli were isolated up to 90% out of total test groups on a selective medium(S-S agar). The number of total bacteria was reduced by over 2 to 4log cycles with an irradiation of 5 kGy to 10 kGy, and an irradiation treatment of over 5 kGy was shown to be effective for the radurization of yeast & mold, coliform group and other enteric bacilli. Thus, it was possible to extend the microbiological self-life of chicken for about 2 to 7 weeks compared with the control.

닭고기의 위생적이고 경제적인 저장법 개발을 위하여 0, 5, 8및 10kGy의 감마선(線)을 조사(照射)하고 $3{\sim}4^{\circ}C$에서 41일간 냉장하면서 오염된 미생물의 살균효과를 조사(調査)하였다. 닭고기의 일반세균의 오염은 중온균이 $7.8{\times}10^5/g$, 저온균이 $3.6{\times}10^5/g$, 고온균이 $1.1{\times}10^3/g$으로 나타났으며, 효모 및 곰팡이는 $3.0{\times}10^3/g$마리, 장내세균 중 대장균군은 $2.1{\times}10^3/g$, 또한 선택성이 감한 S S agar 배지에서 80마리의 시험구중 91%인 74마리가 분리되었고 8.0${\times}$10/g정도였다. 감마선 살균효과에서 일반세균은 5${\sim}$10kGy의 조사(照射)로 2${\sim}$4log cycles이상 멸균되었고, 또한 5kGy이상의 조사(照射)는 효모 및 곰팡이, 대장균군과 다른 장내세균의 살균(殺菌)에 매우 효과적이며, 미생물학적 측면에 있어서 2${\sim}$4주간 저장기간의 연장이 가능하였다.