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The Difference of the Quality Characteristics of Sheperd's Purse (Capsella bursa-pastoris) with the Pre-treatment, Freezing and Thawing Methods
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전처리 및 냉·해동 방법에 따른 냉이의 품질 특성 차이

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Type
Academic journal
Author
신혜림 (농촌진흥청) 박지현 (농촌진흥청) 이상윤 (건국대학교) 박보람 (농촌진흥청) Gwi Jung Han (농촌진흥청) 최미정 (건국대학교) 김하윤 (농촌진흥청농업과학기술원)
Journal
Korean Society for Food Engineering 산업식품공학 산업식품공학 제20권 제4호 KCI Accredited Journals SCOPUS
Published
2016.1
Pages
269 - 277 (9page)

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The Difference of the Quality Characteristics of Sheperd's Purse (Capsella bursa-pastoris) with the Pre-treatment, Freezing and Thawing Methods
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Abstract· Keywords

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The conditions of blanching, freezing, and thawing for Shepherd’s purse (Capsella bursa-pastoris [L.]) were studied to improve its quality attributes during frozen storage. The washed samples were blanched with water at 100oC for 10, 20, 30, and 40 s. They were then soaked in cold water. The quality characteristics of the samples such as pH, texture, hardness, color value, and total viable cell were analyzed. The samples blanched for 30 s were frozen and thawed under several conditions and their physicochemical characteristics were analyzed. The pH value of raw samples was higher than that of the blanched sample. The values of brightness (L*), redness (a*), and yellowness (b*) decreased after blanching except the L* value of root at the condition of blanching for 40 s. Upon considering the bacterial cell counts, the proper condition was determined to be 30 s of blanching time. Blanching for 30 s was the optimal pre-treatment for minimizing the quality deterioration of the shepherd’s purse for freezing. Regarding its color change and microbial safety, faster freezing and thawing methods made less changes on the quality of frozen samples. Consequently, immersion freezing and radio-frequency thawing were the most effective in minimizing the quality change.

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