Pectinase 생산균의 분리 및 특성

A bacterium, named as strain KL34, producing extracellular pectinase was isolated from soil. The mophological cheracteristics of the isolated bacterium were gram-negative, rod-shaped and endospore unformed. Production of pectinase of strain KL34 was induced only by polygalacturonic acid added to the culture media as a sole carbon source. Pectinase activity of KL34 reached a maximum value in the culture conditions of pH 8.5 at $25^{\circ}C$. Optimal medium for pectinase production was determined to the composition of 2% polygalacturonic acid, 0.25% yeast extract, 0.02% $K_2HPO_4$, 0.02% $CaCl_2$, and 0.05% KCl per liter. The pectinase activity in the culture supernatant reached the highest amount of 54 U/ml after 3 days cultivation in the optimal media.

본 연구에서는 토양으로부터 높은 pectinase 활성을 나타내는 균주를 분리하였고, pectinase 생산을 위한 최적 배양조건을 검토하였다. strain KL34의 배양특성과 pectinase 생산 조건을 검토한 결과 최적온도 $25^{\circ}C$, 배양액 초기 pH 8.5, 최적 탄소원 2% polygalacturonic acid 및 최적 질소원 yeast extract 0.25%에서 가장 높은 효소활성을 나타내었다.