살균조건이 석류농축액의 저장 중 품질특성에 미치는 영향
Effect of Quality Properties of Pomegranate Concentrate by Sterilization Conditions during Storage
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초록
본 연구에서는 살균조건 및 저장온도에 따른 석류농축액의 품질특성을 조사하였다. 대장균은 모든 구간에서 검출되지 않았으나 일반미생물은 살균처리 하지 않은 구에서 조금 검출되었으며 10℃보다 37℃에서 저장할 때 더 많이 증식하였다. 저장 중 pH는 조금씩 증가하는 경향이며 총산은 조금 감소하는 경향으로 구간들 간에 큰 차이는 없었다. 당도는 저장 중 조금 감소하는 경향으로 나타났다. 37℃에서 저장할 때 L, a, b값 모두 점점 감소하는 경향을 나타내었으나 10℃에서 (B)구간의 경우 색도에 큰 변화가 없어 석류농축액을 65℃에서 30분간 살균한 후 10℃에서 저장하면 미생물의 오염을 방지하고 색의 변화를 최소화 할 수 있는 것으로 나타났다.
Abstract
This study was carried out to investigate the quality properties of pomegranate concentrate with different sterilization conditions and storage temperature during storage. Total microbe level detected in non-sterilization pomegranate concentrate and the multiplication rate of total microbe level were higher at a storage temperature of 37℃ than at 10℃. Coliform was not detected in any of the samples. The pH was gradually increased but °Brix and total acidity were gradually decreased. Changes in a color values were gradually decreased but that of the sterilized pomegranate concentrate at 65℃ (30 min) wasn't changed after storage at 10℃. The sterilization of pomegranate concentrate at 65℃ (30 min) could be useful for preservation.
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