Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Antioxidant and antimicrobial activities of ginger with aging and fermentation

발효숙성생강의 항산화 및 항균 활성

  • Seo, Young-Ho (Department of Food and Nutrition, Wonkwang Health Science University)
  • 서영호 (원광보건대학교 식품영양과)
  • Received : 2017.12.06
  • Accepted : 2017.12.18
  • Published : 2017.12.30
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Abstract

Zingiber officinale Roscoe, commonly known as ginger, has long been used as a powerful health-promoting antioxidant that supports cellular health of the human body. The objective of this study was to compare the antioxidant and antimicrobial activities of the samples with aging and fermentation. Antioxidant activities of the samples were compared using total phenol, flavonoid contents, ABTS cation radical scavenging activity and DPPH radical scavenging activity. Antimicrobial activities were also examined using the paper disc method and minimum inhibitory concentration (MIC). Acidity of the fermented ginger (FG) with lactic acid bacteria showed a significantly higher value than that of the ginger (GG). The content of 6-gingerol, a bioactive component in ginger, decreased in all fermented gingers but 6-shogaol which is also one of the main valuable ingredients showed the increased content at ginger fermented with Streptococcus thermophilus and Lactobacillus acidphilus. Flavonoid contents of the FG and GG did not show significant differences. However, ABTS cation radical scavenging activity and DPPH radical scavenging activity were 10-30% increased in the samples with fermentation (p<0.05), respectively. The samples of the disc showed an inhibitory effect on growth of gram positive Staphylococcus aureus and Listeria monocytogenes. Zinger with fermentation showed higher antioxidant and antimicrobial activities. Thus, we conclude that aging and fermentation can be a helpful process to increase the functional effects of ginger.

본 연구는 생강의 천연 기능성 식품소재로서 활용성을 높이기 위해 마쇄한 생강과 숙성 후 발효시킨 생강을 이용하여 항산화 및 항균활성의 특성을 비교하였다. 생강 추출물의 pH는 6.68 산도는 0.39로 나타났으며, 생강을 발효숙성 시켰을 때 pH는 감소하였으나, 산도는 전반적으로 증가하였다. 일반 생강의 6-gingerol 함량은 $404.8{\mu}g/g$ 이었으며, 6-shogaol은 검출되지 않았으나, 발효숙성생강 추출물의 6-shogaol 함량은 $128.8-196.4{\mu}g/g$로 증가하여 발효숙성 과정 중 6-gingerol이 6-shogaol로 변환되었음을 확인할 수 있었다. 총 페놀함량과 총 플라보노이드 함량 분석결과, 일반생강 추출물의 총페놀 함량이 높았으며, 총 플라보노이드 함량의 유의차는 없었다. ABTS 활성소거능은 발효숙성 생강이 88.11-101.32%로 65.43%의 일반생강 추출물보다 유의적으로 높았으며, DPPH radical 소거능도 발효숙성생강 추출물이 10-20% 정도 유의적으로 높은 결과를 보였으며(p<0.05) 특히 S. thermophilus로 발효한 생강에서 가장 높았다. 일반생강과 발효숙성생강 추출물의 항균효과를 확인하고 활성의 차이를 비교하기 위하여 실시한 디스크확산법에 의한 결과는 그람양성균인 S. aureus와 L. monocytogenes 균주에서 발효숙성생강 추출물의 항균활성이 유의적으로 더 높은 것을 확인하였으며, 특히 L. brevis로 발효시킨 추출물의 항균효과가 가장 높았다. 또한 그람음성균인 Salmonella spp. 균주에서도 일반생강에서는 clear zone이 관찰되지 않았으나, 발효숙성생강 추출물에서는 1.88-2.51 cm의 clear zone을 확인하였다. 하지만 E. coli에서는 clear zone이 관찰되지 않았다. 최소억제농도인 MIC 결과 항균효과를 위해 발효숙성생강보다 일반생강에서 보다 많은 양의 시료가 요구 되는 것으로 나타났다. 본 연구 결과 생강을 숙성 후 발효시키면 천연기능성 식품소재로서 radical 소거 및 항균활성이 높게 측정되었음을 확인하였으며, 발효 중 생강의 매운맛이 감소되었을 것으로 판단되어 향후 식품산업에서 발효숙성생강을 이용할 때 항산화 및 항균성의 기초자료가 될 것으로 여겨진다.

Keywords

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