감마선 조사 숙면의 미생물 및 일반 품질특성 변화

Changes of Microbiological and General Quality Characteristics of Gamma Irradiated Half-Cooked Noodle

숙면에 감마선을 조사하여 상온에 보관하면서 보존기간중의 미생물 및 일반 품질특성 변화를 조사하였다. 숙면의 곰팡이는 5 kGy의 감마선 조사에 의하여 완전 사멸되었으며 일반세균은 5 kG)에서 2 log cycle, 10 kGy에서 4 log cycle수준으로 감소하였고 10 kGy에서 안정적으로 미생물의 생장이 억제되었다 숙면의 pH는 보존기간을 통하여 점차 낮아졌으나 감마선을 조사한 시료는 pH의 강하가 지연되었고 수분활성도는 보존기간을 통하여 증가하였으나 감마선 조사에 의한 각 시료간의 차이는 없었다 기계적 물성 측정결과, 감마선 조사는 보존초기에는 면의 stickiness를 낮추었으나 보존기간의 경과에 따라 오히려 대조구에 비하여 stickiness가 높아졌다.

Effect of gamma irradiation on quality properties of half·cooked noodle was studied. The noodle were treated with lactic acid(0.1%, w/w), heat(10 min in boiling water) or their combination after cooking for 3 min, and irradiated at 0, 5 and 10 kGy. The noodle were stored at 25。C for 5 weeks and microbial population, Aw, pH, and texture profiles were examined. Fungi were completely eliminated by gamma-irradiation with 5 or 10 kGy does. Number of aerobic bacteria were also decreased by 2 and 4 log cycles with dose of 5 and 10 kGy, respectively. The D10 values of aerobic bacteria were 2.34∼2.95 kGy. Growth of the aerobic bacteria that survived even at 10 kGy of irradiation were significantly inhibited during storage. Acidification of half-cooked noodle was suppressed by gamma irradiation but A${_w}$ were not affected. Stickiness was decreased at the beginning of storage by gamma irradiation but was restored after 3 weeks. The results indicated that the gamma irradiation would be useful to improve quality and storage stability of half-cooked noodle.