Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Changes in quality characteristic of immature flat persimmon (Diospyros kaki Thunb) during heat treatment aging

열처리 숙성 중 반시 미숙과의 이화학적 특성

  • Received : 2015.11.17
  • Accepted : 2016.03.07
  • Published : 2016.06.30
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Abstract

The objective of this study was to investigate physicochemical and antioxidant characteristics of immature flat persimmon during 7 heat treatment aging steps. The pH decreased, and hence, acidity increased with aging. Hunter L value decreased with aging. The a value rapidly increased until step 3, whereas the b value decreased. Fructose content decreased while glucose contents slightly increased during aging. Hardness, chewiness and gumminess rapidly decreased, indicating softening in texture, but it was negligible after aging step 3. Phenolic compounds including gallic acid and homogentisic acid were detected at step 3 and then gradually increased with aging. However, contents of flavonoid and tannin were much higher in step 1 sample than others. The antioxidant activities observed by DPPH, ABTS, and FRAP assay were the highest at step 1 possibly due to the higher levels of flavonoids and tannin acid in the step 1 sample.

미숙과의 가공법 제안 및 기능성 규명을 위한 기초 연구의 일환으로 반시 미숙과를 7 step으로 나누어 열처리 숙성하면서 이화학적 특성 및 항산화 활성의 변화를 분석하였다. 반시 미숙과는 숙성됨에 따라 수분함량과 pH는 점차 감소하고, 산도는 증가하는 경향이었다. 숙성이 진행됨에 따라 갈변이 유도되면서 step 3까지 적색도는 급격히 증가하였으며, 황색도는 큰 폭으로 감소하였다. 반시의 탄력성, 씹힘성과 점착성의 경우에는 step 2~3에서 변화한 후에는 유의적인 차이를 보이지 않았다. 숙성 중 반시 미숙과의 fructose의 함량은 감소한데 반해 glucose 함량은 미량 증가하였다. 페놀성 화합물은 gallic acid와 homogentisic acid, 2종이 검출되었는데 이들 화합물은 step 2까지는 검출되지 않았으나, step 3부터 숙성단계가 지남에 따라 함량이 증가하였다. 이와 상반되게 탄닌 함량은 step 1에서 가장 높게 측정되었고 step 2에서 급감하였다. 숙성 단계별 반시 미숙과 물 추출물의 DPPH와 ABTS 라디칼 소거능 및 FRAP법에 따른 항산화 활성은 시료의 농도에 비례하여 유의적으로 증가하였으나, 숙성이 진행될수록 오히려 낮아졌다.

Keywords

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