순물을 이용한 꽃송이 버섯 균사체 배양액의 항균활성 평가
Antimicrobial Effect of the Submerged Culture of Sparassis crispa in Soybean Curd Whey
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초록
꽃송이 버섯 균사체 배양의 최적 조건을 확립하여 얻어진 꽃송이 버섯 균사체 배양액에 대한 항균활성을 검색하였다. 순물에 glucose 2%를 첨가하여 10일 배양한 꽃송이 버섯 배양액은 pH 6.91, 균사체 함량은 17.76 g/L로 나타났으나, 제한 배지에서 10일 배양 후 분석한 결과, pH 3.26, 균사체 함량은 3.45 g/L로 측정되었다. 또한 순물을 이용한 버섯 배양액의 수용성 단백질 함량은 511.85 mg%, 타이로신 59.6 mg%, 환원당 188.44 mg%이며, 베타글루칸 함량은 10.64%로 나타났다. 순물을 이용한 꽃송이 버섯 배양액의 항균활성 평가를 위해 8 종의 유해세균에 대한 꽃송이 버섯 균사체 배양액을 disk diffusion method로 항균효과를 검색하였다. B. cereus, St. aureus, L. monocytogenes, S. typhimurium 균주는 0.13 mg/disc에서 6.28 mg/disc의 범위에서 농도 의존적으로 활성이 나타났다. 배양액을 85℃에서 15분, 100℃에서 5분간 열처리 후에도 항균 활성에서 변화를 보이지 않았다. 또한 한외여과법을 이용하여 3 kDa 이하의 저분자 물질의 항균 활성을 측정한 결과, B. cereus는 34.3 mm, St. aureus는 29.3 mm, L monocytogenes는 23.7 mm, S. typhimurium는 16.7 mm로 생육 억제 환을 보였다. 미세희석법을 이용한 꽃송이 버섯의 항균물질의 최소저해농도(MIC)는 B. cereus 2.6 mg/mL, St. aureus, L. monocytogenes 12.6 mg/mL, S. typhimurium 62.8 mg/mL인 것으로 나타났다. 꽃송이 버섯 배양액의 항균물질은 열과 단백질 분해효소 처리에 안정한 저분자 물질인 것으로 나타나 천연 항균 소재로서 산업적 활용이 기대된다.
Abstract
Sprassis crispa was cultivated using soybean curd whey, and its antimicrobial activities were examined against those of eight microorganisms that were foodborne pathogens or food-poisoning bacteria. The culture broth of soybean curd whey was superior in mycelium content (17.76 g/L) to that of the defined culture broth, and the β-glucan content was about 10.64 percent (w/w). The antimicrobial activities of the culture broth were confirmed against those of B. cereus, St. aureus, L. monocytogenes and S. typhimurium using the paper disk method. The antimicrobial activity was also maintained after the heat treatment and alcalase treatment. The filtrate with less than 3 kDa M.W. also showed the antimicrobial activity against four strains: B. cereus, St. aureus, L. monocytogenes and S. typhimurium. The minimum inhibitory concentration (MIC) was about 1.26 mg/mL in the B. cereus and 12.6 mg/mL in the St. aureus and L. monocytogenes. The S. typhimurium showed a MIC of 62.8 mg/mL. Thus, the culture of Sparassis crispa using soybean curd whey provides a thermally stable antimicrobial agent that can be used as a natural preservative in the biofood industry.
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