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청국장의 발효기간에 따른 trans-Resveratrol과 비소화성 올리고당의 변화 및 항산화활성

Antioxidant Activities and Changes in trans-Resveratrol and Indigestible Oligosaccharides according to Fermentation Periods in Cheonggukjang

  • 최명효 (경남과학기술대학교 식품과학부) ;
  • 조계만 (경남과학기술대학교 식품과학부) ;
  • 남상해 (경남과학기술대학교 식품과학부)
  • Choi, Myounghyo (Div. of Food Science, Gyeongnam National University of Science and Technology) ;
  • Cho, Kyeman (Div. of Food Science, Gyeongnam National University of Science and Technology) ;
  • Nam, Sanghae (Div. of Food Science, Gyeongnam National University of Science and Technology)
  • 투고 : 2013.10.10
  • 심사 : 2013.12.20
  • 발행 : 2014.02.28

초록

몇 가지 식물에서 발견되는 항독성 물질(phytoalexin)인 trans-resveratrol(3,5,4'-trihydroxy-trans-stilbene)은 항암, 항산화효과 및 심혈관질환 등에 효과가 큰 물질로 알려져 있으며, 포도, 땅콩 및 오디 등의 발효 시에 증가되어 그 효과가 커지는 것으로 알려져 있다. 한편 stachyose 및 raffinose 등의 기능성 올리고당은 장내 미생물의 생육을 도와 정장작용을 하는 것으로 알려져 있다. 따라서 본 연구에서는 3품종의 대두를 이용하여 제조한 청국장의 발효 중 trans-resveratrol과 기능성 올리고당의 함량 변화를 조사하였으며, 이에 따른 항산화효과를 알아보려고 하였다. trans-Resveratrol 함량은 원료 콩보다는 발효되었을 때 대체로 발효기간이 길어질수록 그 함량이 높게 나타났다. 특히 48시간 발효 후에는 3품종의 콩에서 늘찬, 대원 및 태광의 순으로 각각 $50.06{\pm}0.82$, $39.04{\pm}0.49$, $34.00{\pm}0.54{\mu}g/g$이었으며, 원료 콩에 비하여 4배 이상 증가하였다. Stachyose 함량은 원료 콩에서 $10.84{\pm}0.42{\sim}13.05{\pm}0.13mg/g$, 증자 직후에는 $11.37{\pm}0.03{\sim}12.05{\pm}0.52mg/g$이었으나, 발효 12시간 후에는 $0.16{\pm}0.01{\sim}0.33{\pm}0.02mg/g$으로 원료 콩에 비하여 97% 이상이 줄어들었으며 발효 24시간 후부터는 전혀 검출되지 않았다. 한편 raffinose의 함량은 원료 콩에서 $2.66{\pm}0.09{\sim}3.54{\pm}0.05mg/g$으로 가장 낮았고, 증자 직후부터 발효 24시간 후에는 $10.61{\pm}0.16{\sim}12.66{\pm}0.17mg/g$으로 약 3~4배가량 증가하였으나 48시간에서는 오히려 $8.28{\pm}0.17{\sim}11.83{\pm}0.44mg/g$으로 감소하는 경향을 보였다. 청국장의 발효기간에 따른 항산화효과는 FRAP, DPPH, ABTS assay 모두에서 증자 직후에는 원료 콩에서보다 다소 낮게 나타났으나 대체로 발효기간이 길어짐에 따라 활성이 높아지는 경향이었다. 이와 같은 경향은 trans-resveratrol의 항산화활성이 DPPH, ABTS와 FRAP assay 등에서 $RC_{50}$ 값이 $4.71{\pm}0.36{\sim}8.46{\pm}0.05{\mu}g/mL$인 것을 미루어 볼 때, 발효기간에 따라 유의적으로 증가한 trans-resveratrol의 영향이 일부 있었을 것으로 생각되었다. 그러나 발효 중 기능성 올리고당(stachyose 및 raffinose)의 변화는 청국장의 항산화효과와는 관련이 없는 것으로 나타났다.

과제정보

연구 과제 주관 기관 : 경남과학기술대학교

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