Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Antimicrobial Activity of Black Garlic Pomace Extract and Its Application to Cleansing of Fresh Spinach Leaves for Microbial Control

흑마늘박 추출물의 항균 활성과 미생물 제어를 위한 시금치 세척에의 이용

  • Kang, Ji Hoon (Department of Food Science and Technology, Chungnam National University) ;
  • Son, Hyeon Jeong (Department of Food Science and Technology, Chungnam National University) ;
  • Min, Sea Cheol (Department of Food Science and Technology, Seoul Women's University) ;
  • Oh, Deog Hwan (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Song, Kyung Bin (Department of Food Science and Technology, Chungnam National University)
  • Received : 2017.01.31
  • Accepted : 2017.03.14
  • Published : 2017.04.30
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Abstract

In this study, the antimicrobial activity of black garlic pomace extract (BGPE) was examined, and its washing applicability to spinach was investigated. BGPE had antimicrobial activity against both Gram-positive (Listeria monocytogenes and Staphylococcus aureus) and Gram-negative (Escherichia coli O157:H7 and Salmonella Typhimurium) food-borne pathogens. In particular, antimicrobial activities of BGPE against Gram-positive bacteria were higher than those against Gram-negative bacteria. Spinach samples were treated with 0.5% BGPE to determine the effect of BGPE on reducing naturally existing microorganisms on the surface of spinach leaves. BGPE treatment reduced populations of total aerobic bacteria and yeast/molds in spinach by 1.23~1.35 log CFU/g and 0.82~1.12 log CFU/g during 9 days of storage, respectively, compared with those of control samples. After treatment, there were no significant differences in color quality such as Hunter L, a, and b values and total color difference (${\Delta}E$). These results clearly indicate that BGPE treatment can be useful for improving microbiological safety and maintaining color quality of spinach during storage.

본 연구에서는 흑마늘 진액 가공 후 발생하는 흑마늘박의 활용 가능성을 검토하고자 흑마늘박 추출물의 항균성과 시금치에 대한 세척 적용 효과를 분석하였다. 흑마늘박 추출물은 주요 병원성 미생물인 L. monocytogenes, S. aureus, E. coli O157:H7, S. Typhimurium에 대해 모두 항균성을 나타냈으며, 특히 그람 양성균인 L. monocytogenes와 S. aureus에 더 효과적으로 작용하였다. 시금치에 0.5% 흑마늘박 추출물을 처리한 후 $4{\pm}1^{\circ}C$에서 9일 동안 저장하면서 미생물 수 변화를 측정하였다. 흑마늘박 추출물 처리는 대조구와 비교하여 저장 9일 동안 시금치의 총 호기성 세균 수를 1.23~1.35 log CFU/g, 효모 및 곰팡이 수는 0.82~1.12 log CFU/g 감소시켰다. 또한, 흑마늘박 추출물 처리는 저장 9일 동안 시금치의 Hunter 색도 값 및 총색차 값을 저장 초기와 유의적인 차이 없이 지속시켰기에 색도 품질 유지 측면에서 단순 물 세척 처리구보다 더 효과적이라고 판단된다. 따라서 본 연구 결과를 통해 흑마늘박 추출물은 병원성 미생물에 대해 높은 항균성을 가지면서 동시에 시금치와 같은 신선 농산물의 미생물 제어를 위한 효과적인 세척 처리 물질로써 활용될 수 있다고 판단된다.

Keywords

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