Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Postharvest Changes in Quality and Biochemical Components of Leaf Lettuce

상치의 수확후(收穫後) 품질(品質) 및 성분변화(成分變化)

  • Kim, Seong Yeol (Dept. of Food Science and Technology, Coll. of Agriculture, Chungnam Natl. Univ.) ;
  • Hong, Young Pyo (Dept. of Food Science and Technology, Graduate School, Chungnam Natl. Univ.) ;
  • Choi, Woo Young (Dept. of Agricultural Chemistry, Coll. of Agriculture, Chungnam Natl. Univ.)
  • 김성열 (충남대학교 농과대학 식품가공학과) ;
  • 홍영표 (충남대학교 대학원) ;
  • 최우영 (충남대학교 농과대학 농화학과)
  • Published : 1985.06.30
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Abstract

This study was conducted to elucidate the shelf-life and quality changes in relation to biochemical components in leaf lettuce (Lactuca sativa L.). The shelf-life of leaf lettuce at room temperature was 2 to 3 days. But it was extended to 3 weeks by packaging in a 0.01 mm thick polyethylene film sack when stored at $3^{\circ}C$. The ascorbic acid contents of fresh leaf lettuce was 25 mg per 100 gram fresh weight. The acid at room temperature was almost destroyed after 4 days storage. But the contents of ascorbic acid at $3^{\circ}C$ maintained about 50 to 60% of the initial level in packaging of polyethylene film sack after 8 days storage. The content of chlorophyll was greatly decreased at room temperature but no significant changes were found at $3^{\circ}C$. The changes of total sugar and reducing sugar contents during storage were not very different between treatments. The contents of alkali soluble protein and free amino acid gradually increased in the treatments of polyethylene film sack packaging during storage in general, but the contents decreased after the increase in control treatment. Nucleic acid content, peroxidase and polyphenoloxidase activities were measured and discussed in relation to the leaf senescence.

상치(Lactuca sativa L.)의 잎을 재료(材料)로 하여 저장온도(貯藏溫度)에 따른 shelf-life를 측정(測定)하고 저장기간(貯藏期間) 동안의 품질(品質) 및 생화학적(生化學的) 변화(變化)를 조사(調査)하여 다음과 같은 결과(結果)를 얻었다. 1. 상치는 실온(室溫)($20^{\circ}C$)에서 2~3일간(日間) 저장(貯藏)이 가능(可能)하였고 저온(低溫)($3^{\circ}C$)에서는 비닐포장(包裝)에 의(依)하여 3주(週)동안 저장가능(貯藏可能)하였다. 2. 상치잎의 바타민 C 함량(含量)은 생체중(生體重)으로 25 mg %이었고 실온(室溫)에서는 4일간(日間) 저장후(貯藏後)거의 전부(全部) 파괴(破壞)되었다. 그러나 저온(低溫)에서는 비닐포장(包裝)에 의(依)하여 8일간(日間) 저장후(貯藏後)에도 약(約)50~60% 잔존(殘存)하였다. 3. 저장중(貯藏中) 엽록소(葉綠素) 함량(含量)은 실온(室溫)에서 크게 감소(減少)하였고, 유리(遊離) 아마노산(酸), 전당(全糖) 및 알카리 가용성(可溶性) 단백질(蛋白質)의 함량(含量)은 증가(增加)하는 경향(傾向)이었으며 환원당(還元糖)의 함량변화(含量變化)는 일정(一定)한 경향(傾向)을 보이지 않았다. 4. 핵산(核酸), peroxidase, polyphenoloxidase 활성(活性)을 측정(測定)하였고 상치잎의 노화(老化)와 관련(關聯)하여 고찰(考察)하였다.

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