본 연구에서는 한약재의 활용도를 높이기 위한 연구로 추출물 농도에 따른 생리활성물질의 용출량을 측정하기 위해 한방약술의 품질 특성과 Glutathione S-transferase의 활성 저해능을 측정한 결과는 다음과 같다. 한방약술의 pH결과는 4.4로 발효 전의 대조구 3.9보다 증가하였다. 이러한 변화는 알코올 발효과정 중 발효부산물 및 유기산 때문으로 사료된다. 한방약술의 산도는 0.55%로 발효 전의 대조구 0.09%보다 약 6배 증가하였다. 이런 결과는 유기산이 알코올 등과 결합하여 ester와 같은 향미 형성 등에 이용되는 것을 알 수 있다. 한방약술 15%의 glutathione S-transferase의 활성 저해능 5.1±0.3, 한방약술 20%는 저해능 6.5±0.5, 한방약술 25%는 7.6±0.6, 한방약술 30%는 8.4±0.2, 최대 농도인 35%에서의 저해능은 9.7±0.7로 나타내었다. 추출 농도별로 glutathione S-transferase의 활성 저 해능은 통계학적으로 유의한 차이가 있음을 보였다 (p<0.05).

This study evaluated the physicochemical and microbial quality characteristic of seasonal commercial kimchi for hygienic safety levels. The pH of seasonal commercial kimchi was 3.84-6.36 and the titratable acidity and salinity of the samples were 0.21-1.16 and 1.19-1.54%, respectively. The content of nitrate and nitrite in the commercial kimchi were lower in the spring and summer, which was affected by acidic condition of the kimchi depending on fermentation. Heavy metal contents in commercial kimchi are not an issue because they were detected only at very low levels. The total aerobic bacteria and coliforms counts ranged from 5.25 to 8.44 Log CFU/g and 0.00 to 5.08 Log CFU/g, respectively. The total aerobic bacteria and coliforms were detected more in summer than in the other seasons. E. coli was detected in three of the samples tested. Food-borne pathogens were not detected in any of the samples except for B. cereus. B. cereus was detected in the fall in more than 70% of samples. These results suggest that commercial kimchi distributed in the fall maintain the quality properties and the microbiological safety of kimchi compared to the other seasons. Therefore, further studies as an effective distribution system for the particular seasons will be needed to guarantee the hygienic safety levels of commercial kimchi required by the consumers.

This study aimed to evaluate the characteristic differential between whole cabbage kimchi (pogi kimchi) and sliced cabbage kimchi (mat kimchi) during kimchi fermentation at 6oC. The difference of microbial and physicochemical properties was investigated until 6 weeks. For the changes in the microbial flora, both kimchi samples exhibited a continuous increase in total aerobic bacteria and lactic acid bacteria (LAB) population size up to 2 weeks followed by a stationary phase until 5 weeks. Interestingly, the number of LAB of mat kimchi was overall higher than that of pogi kimchi during kimchi fermentation. We speculate that mat kimchi has in a more advantageous growth condition than pogi kimchi for microbial growth because small kimchi cabbage size appropriately derives nutritional supply in order to increase the LAB growth. During lactic fermentation at 6oC, physicochemical changes in the pH, salinity, and titratable acidity was observed to be no significant differences between two types of kimchi. Furthermore the contents of organic acids such as oxalic acid, citric acid, malic acid, lactic acid, fumaric acid, and acetic acid was not significantly different (p>0.05) between both kimchi samples as well as the contents of total free amino acid.