Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Physicochemical Characteristics of Ponciri Fructus in Relation to Drying Treatment

포제조건이 지실의 이화학적 특성에 미치는 영향

  • Chung, Hun-Sik (Food and Bio-Industry Institute, Kyungpook National University) ;
  • Hwang, Sung-Hee (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
  • 정헌식 (경북대학교 식품생물산업연구소) ;
  • 황성희 (대구가톨릭대학교 식품산업학부) ;
  • 윤광섭 (대구가톨릭대학교 식품산업학부)
  • Published : 2005.10.01
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Abstract

The objective of this study was to investigate the effect of drying methods on the physicochemical characteristics of Ponciri fructus. Immature fruits of Poncirus trifoliata were harvested, dried by shade, infrared, or freeze drying, and powdered to size of 20 mesh. Then, extracted for 3 hrs with hot-water or 40% ethanol(80$\circC$℃). Freeze dried powder showed significantly higher L and -a value. The content of hesperidin was not affected by drying methods. The yield was the highest from freeze drying. Water extracts showed significantly more browning color, and higher acidity and total sugar content than those of ethanol extracts. Acidity and total sugar of water extracts were the highest in infrared drying and freeze drying, respectively. Browning color, pH, acidity and total sugar of ethanol extracts were not affected by the drying methods. The results suggest that freeze drying has a beneficial effects to enhance the quality of Ponciri fructus.

고품질의 지실을 포제하기 위한 건조법을 개발하기 위하여, 미성숙 탱자과실을 자연음건법, 적외선건조법, 동결건조법 등으로 건조하고 분말 및 추출액을 조제하여 이화학적 특성을 조사하였다. 동결건조 분말은 다른 건조법의 분말보다 L값, -a값, carotenoid, chlorophyll a 및 b 함량은 높았으나 naringin 함량은 유의적으로 낮았다. 적외선건조 분말은 자연음건 분말보다 L값, naringin, chlorophyll b 함량은 낮았으나 b값, carotenoid, chlorophyll a 함량은 유의적으로 높았다. 반면에 분말의 hesperidin 함량은 건조방법에 따른 유의적인 차이를 보이지 않았다. 추출수율은 에탄올보다 물 추출에서 높았으며 물 추출에서는 동결건조구에서 가장 높았으나 에탄올 추출에서는 건조방법의 영향을 보이지 않았다. 물 추출액은 에탄올 추출액보다 갈변도, 산도, 총당 함량은 유의적으로 높았으나 pH는 낮았다. 물 추출액의 산도는 적외선건조구에서, 총당은 동결건조구에서 각각 가장 높았으나 갈변도와 pH는 건조방법간에 유의적인 차이를 보이지 않았다. 한편, 에탄올 추출액의 갈변도, pH, 산도 및 총당 등은 건조방법의 영향을 보이지 않았다. 이상의 결과로 볼 때, 건조방법은 지실의 이화학적 특성에 상당한 영향을 미치며 자연음건보다는 동결건조가 고품질의 지실을 포제할 수 있는 방법으로 확인되었다.

Keywords

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