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Change of physicochemical properties, phytochemical contents and biological activities during the vinegar fermentation of Elaeagnus multiflora fruit

보리수 열매 식초 발효 중 이화학적 특성, phytochemical 함량 및 생리활성 변화

  • Cho, Kye Man (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Hwang, Chung Eun (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Joo, Ok Soo (Department of Food Science, Gyeongnam National University of Science and Technology)
  • 조계만 (경남과학기술대학교 식품과학부) ;
  • 황정은 (경남과학기술대학교 식품과학부) ;
  • 주옥수 (경남과학기술대학교 식품과학부)
  • Received : 2016.10.06
  • Accepted : 2017.02.08
  • Published : 2017.02.28

Abstract

This study evaluated the changes of physiochemical properties, phytochemical contents, and biological activities during the vinegar fermentation of Elaeagnus multiflora fruit. The contents of pH and reducing sugar decreased from 3.55 and 6.88 mg/mL 3.34 and 2.13 mg/mL, respectively. However the acidity increased from 0.48% to 5.48% during the vinegar fermentation. The alcohol contents increased up to a maximum value of 6.6% at 20 days, and it then decreased at the end fermentation days (2.0%). The viable numbers of acetic acid bacteria and yeasts increased from 4.32 log CFU/mL and 3.23 log CFU/mL at 10 days to 5.4 log CFU/mL and 5.5 log CFU/mL during the spontaneous fermentation, respectively. The major organic acids were acetic acid (38.84 mg/mL), lactic acid (4.92 mg/mL), and malic acid (1.51 mg/mL). The soluble phenolic and flavonoid contents increased from 0.79 mg/mL and 0.12 mg/mL of initial fermentation day to 1.22 mg/mL and 0.14 mg/mL during the spontaneous fermentation. Content of epicatechin gallate decreased from $168.1{\mu}g/mL$ at 10 days to $115.97{\mu}g/mL$. However the content of gallic acid increased from $18.52{\mu}g/mL$ to $95.07{\mu}g/mL$ during fermentation. After 60 days of the fermentation, the antioxidant and digestive enzyme inhibitory activities were 71.35% (DPPH), 79.27% (ABTS), 68.72% (${\cdot}OH$), 85.42% (${\alpha}$-glucosidase), 52.12% (${\alpha}$-amylase), and 53.66% (pancreatic lipase), respectively.

뜰보리수 열매 식초 발효 중 이화학적 특성, 생리활성물질(flavonols과 phenolic acids) 및 생리활성 변화를 조사하였다. 자연 발효 중 pH와 환원당은 발효 초기 각각 3.55와 6.88 mg/mL에서 3.34와 2.13 mg/mL로 감소하였고, 반면에 산도는 0.48%에서 5.48%로 증가하였다. 알코올 함량은 20일째까지 증가하여 6.6%로 최대치를 나타낸 후 감소하여 발효 종기 2.0%를 나타내었다. 초산균수는 발효 10일째 4.32 log CFU/mL에서 5.4 log CFU/mL로 증가하였고, 효모 균수는 3.23 log CFU/mL에서 5.5 log CFU/mL로 증가하였다. 뜰보리수 열매 식초의 주요 유기산은 초산, 젖산 및 사과산으로 각각 38.84 mg/mL, 4.92 mg/mL 및 1.51 mg/mL를 함유하고 있었다. 수용성 phenolics와 flavonoids 함량은 발효 중에 증가하여 발효 초기 각각 0.79 mg/mL과 0.12 mg/mL에서 1.22 mg/mL과 0.14 mg/mL로 증가하였다. Flavonols 화합물 중 epicatechin gallate는 발효 10일째 $168.1{\mu}g/mL$에서 $115.97{\mu}g/mL$로 감소하였으나, phenolic acids 화합물 중 gallic acid는 $18.52{\mu}g/mL$에서 $95.07{\mu}g/mL$로 증가하였다. 자연 발효 60일째 DPPH 라디칼 소거활성은 71.35%, ABTS 라디칼 소거활성은 79.27%, hydroxyl 라디칼 소거활성은 68.72%, ${\alpha}$-glucosidase 저해활성은 85.42%, ${\alpha}$-amylase 저해활성은 52.12% 및 pancreatic lipase 저해활성은 53.66%를 나타내었다.

Keywords

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