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

  • 제40권2호
  • /
  • Pages.205-213
  • /
  • 2011
  • /
  • 1226-3311(pISSN)
  • /
  • 2288-5978(eISSN)
한국식품영양과학회 (The Korean Society of Food Science and Nutrition)
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다양한 페놀성 물질과 Folin-Ciocalteu 시약의 반응성에 미치는 영향 요인 평가

Factors Affecting Reactivity of Various Phenolic Compounds with the Folin-Ciocalteu Reagent

  • 홍정일 (서울여자대학교 식품과학부) ;
  • 김현정 (서울여자대학교 식품과학부) ;
  • 김지윤 (서울여자대학교 식품과학부)
  • Hong, Jung-Il (Division of Food Science, College of Natural Science, Seoul Women's University) ;
  • Kim, Hyun-Jung (Division of Food Science, College of Natural Science, Seoul Women's University) ;
  • Kim, Ji-Yun (Division of Food Science, College of Natural Science, Seoul Women's University)
  • 투고 : 2010.11.05
  • 심사 : 2010.11.26
  • 발행 : 2011.02.28
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초록

본 연구에서는 F-C시약을 이용한 페놀성 물질의 정량방법에서 다양한 종류의 페놀성 성분들의 반응특성 및 반응영향요인들을 분석하였다. 정량방법 중 $Na_2CO_3$를 선처리는 F-C시약을 먼저 처리하는 방법에 비해 대부분 페놀성 물질들의 발색반응도 감소를 야기하였으며, 특히 -OH 밀도가 높은 galloyl group을 가진 gallic acid 및 EGCG 등의 성분이 두드러진 감소를 나타내었다. F-C시약과 $Na_2CO_3$를 동시에 처리하는 경우 F-C시약을 선처리 하는 경우에 비해 각 페놀성 물질의 반응성이 약간 감소되는 경향을 나타내었다. 그 원인은 페놀성 물질들이 산성인 F-C시약에서보다 $Na_2CO_3$ 용액의 알칼리 환경에서 화학적으로 불안정하기 때문이며, pH 7.4 및 9의 환경에서 페놀성 물질로부터 생성된 산화물들은 F-C시약과의 반응성이 약화됨을 확인하였다. 이 과정중에 같이 형성된 $H_2O_2$는 F-C와의 반응에 직접적인 영향을 미치지 않았다. FeA와 SiA와 같은 monophenol류는 방법의 차이에 따라 큰 반응성의 변화를 나타내지 않았으며, 발색도는 느리지만 꾸준히 증가하는 kinetics 패턴을 보였다. 실제 시료에의 적용을 위해 연잎 추출물을 제조하고 각 정량방법에 대한 반응도 차이를 조사한 결과, 역시 $Na_2CO_3$ 처리환경에서 현저한 발색반응도 저하를 나타내었다. 보다 정확한 페놀성 물질의 정량을 위해 적절한 표준물질의 선택 및 정량 방법 등에 대한 표준화가 필요할 것으로 사료된다.

The Folin-Ciocalteu (F-C) reagent has been extensively used for quantifying total phenolic contents in many different types of food materials. Since several different procedures of the assay methods using the F-C reagent have been applied, we investigated changes in reactivity of various phenolic compounds with the F-C reagent under three different assay conditions and factors affecting reactivity. Among 10 standard compounds tested, compounds with high hydroxyl density (number of -OH/molecular weight) showed a largely different response according to addition sequence of the F-C reagent or $Na_2CO_3$. Preincubation in $Na_2CO_3$ significantly reduced the reactivity of the phenolic compounds bearing galloyl moiety (e.g. gallic acid, tannic acid, and epigallocatechin-3-gallate) with the F-C reagent, while monophenol compounds including ferulic acid and sinapinic acid were more stable as compared to diphenols. There was little change in response to the F-C reagent of all phenolic compounds incubated in acidic pH; their reactivity except ferulic acid was reduced significantly when incubated in neutral or alkaline pH. Changes in reactivity of gallic acid incubated in $Na_2CO_3$ or neutral/alkaline pH conditions were the most prominent. $H_2O_2$ generated from phenolic compounds did not affect the reaction with the F-C reagents. The present results suggest that reactivity of different phenolic compounds with F-C reagent was affected considerably by different procedures of the assay, and the total phenolic contents could be fluctuated according to standard compounds and assay scheme.

키워드

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