Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Microbiological, Physicochemical, and Antioxidant Properties of Plain Yogurt and Soy Yogurt

플레인 요구르트와 소이 요구르트의 미생물학적, 물리화학적 및 항산화 활성

  • Lim, Sung-Mee (Department of Food Nutrition& Science, Tongmyong University)
  • 임성미 (동명대학교 식품영양과학과)
  • Received : 2013.10.14
  • Accepted : 2013.12.03
  • Published : 2013.12.31
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Abstract

This study evaluated the physicochemical and microbiological characteristics and antioxidant properties of yogurt samples fermented with lactic acid bacteria (LAB) obtained from pickled cabbage. API 50 CHL systems and 16S rRNA nucleotide sequence analyses revealed that the isolates were Lactobacillus casei PC05 and L. acidophilus PC16. Cell counts, titratable acidity, and viscosity of the yogurt samples fermented with L. acidophilus PC16 were significantly higher than those of the samples fermented with L. casei PC05 (P<0.05). The detected cell counts and physicochemical properties were significantly lower in plain yogurt than in soy yogurt (P<0.05). Yogurt samples fermented with L. acidophilus PC16 exhibited higher antioxidant activity, measured as ability to scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals and chelate ferrous ions, than those fermented with L. casei PC05. However, the ability to scavenge superoxide anions and superoxide dismutase (SOD) activity were significantly (P<0.05) higher in yogurt samples fermented with L. casei PC05 compared to those in samples fermented with L. acidophilus PC16. The antioxidant activity of soy yogurt was significantly (P<0.05) higher than that of plain yogurt. The antioxidant activity of the tested strains resulted in lipid peroxidation inhibition (in vitro), which may be related to the elimination of free radicals, chelating ability, and reducing power. There were no significant differences in the physicochemical properties and antioxidant activities of the yogurt samples during cold storage.

양배추 피클로부터 분리된 유산균으로 발효하여 제조한 플레인 요구르트와 소이 요구르트를 저장하는 동안 미생물학적 및 물리화학적 변화와 항산화 특성을 조사하였다. 분리 균주는 당분해능과 유전자 염기서열 분석을 통해 L. casei PC05와 L. acidophilus PC16으로 동정되었다. Lactobacillus acidophilus PC16 균주로 발효시킨 요구르트의 적정산도, 점도 및 균수는 L. casei PC05 균주에 의해 제조된 요구르트에 비해 높게 나타났으며, 특히 플레인 요구르트보다 소이 요구르트에서 세균수와 물리화학적 요인의 측정값이 유의하게 높은 것으로 확인되었다. 한편, L. acidophilus PC16 균주로 발효시킨 요구르트는 DPPH 라디칼 소거능과 철이온 킬레이팅 활성이 높았으나, L. casei PC05 균주의 요구르트는 superoxide anion 제거능과 SOD 활성이 높은 것으로 나타났다. 대부분의 항산화능은 플레인 요구르트보다 소이 요구르트에서 더 높게 나타났으며, 요구르트의 지질과산화 억제능은 항산화 활성에 기인하는 것으로 추정된다. 또한 발효직후 요구르트의 미생물학적, 물리화학적 및 항산화 활성은 $4^{\circ}C$에서 8일간 저장하는 동안 거의 일정한 수준으로 유지되었다.

Keywords

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