수확 후 돌나물의 미생물학적 안전성 확보를 위해 1% acetic acid 침지 세척과 $10kJ/m^2$ UV-C 조사를 병합처리하여 $10^{circ}C$에서 6일간 저장하면서 미생물 수, 색도, 비타민 C 함량, 항산화능을 측정하였다. 돌나물에 병합처리 후 총호기성 세균 수는 대조구와 비교하여 3.28 log CFU/g, 효모 및 곰팡이에서는 4.22 log CFU/g 감균 효과를 보였으며, 이러한 효과는 저장 6일 동안 유지되었다. Acetic acid와 UV-C 병합처리는 대조구와 비교하여 돌나물의 저장 중 Hunter 색도 값에 부정적인 영향을 끼치지 않았다. 또한 비타민 C 함량과 항산화능은 저장기간 동안 처리구와 대조구 모두 감소하였으나, 처리에 의한 차이는 없는 것으로 나타났다. 따라서 본 연구 결과 acetic acid와 UV-C 병합처리가 수확 후 돌나물의 저장, 유통 시 미생물학적 안전성을 확보하고 품질 유지에 효과적인 hurdle technology라고 판단된다.
With the current consumer trend toward health and wellbeing, the demand for consumption of fresh cut vegetables has been increasing. As a popular vegetable with functional components, sedum (Sedum sarmentosum) is widely used in Korea as a side dish that needs no cooking. In this study, to provide a hurdle technology for postharvest sedum, the effects of combined treatment of 1% acetic acid for washing and $10kJ/m^2$ UV-C irradiation on the microbial growth and quality of sedum were examined. After the treatment, the sedum samples were stored at $10^{circ}C$ for six days, and the results of their microbial analysis as well as their color, vitamin C content, and antioxidant activity were analyzed. The combined treatment with acetic acid and UV-C irradiation reduced the initial populations of the total aerobic bacteria and the yeast and molds in the sedum by 3.28 and 4.22 log CFU/g, respectively, compared to those in the control. The Hunter L, a, and b values of the sedum did not significantly differ across the treatments. In addition, the vitamin C content and the antioxidant activity decreased significantly during the storage, regardless of the treatment. These results suggest that the combined treatment with 1% acetic acid and $10kJ/m^2$ UV-C irradiation can be useful as a hurdle technology for retaining the microbiological safety and quality of sedum during its storage.
