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KMID : 0903619900310030219
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Journal of the Korean Society for Horticultural Science
1990 Volume.31 No. 3 p.219 ~ p.225
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Influence of Packaging with High - density Polyethylene Film on the Quality of Leaf Lettuce (Lactuca sativa L. cv . Cheongchima) during Low Temperature Storage
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Abstract
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The influence of different storage temperatures (0 to 1℃ and 4 to 5℃) and packaging with high-density polyethylene (HDPE) film (0.01mm thickness) on the shelf life and biochemical changes were investigated in leaf lettuce (Lactuca sativa L. cv. Cheongchima). The results were summarized as follows:
1. Weight loss was reduced by packaging with I-1DPE film, and the effect was more outstanding at 0 to 1℃ than 4 to 5℃.
2. Packaging with HDPE film was also more effective in maintaining the general appearence when stored at 0 to 1℃ than at 4 to 5℃.
3. Yellowing was significantly inhibited at 0 to 1℃ as compared with 4 to 5℃ on 32 days of storage in the treatment packaged with HDPE film.
4. In all treatments, the ratio between the content of chlorophyll a vs. b was about 3 : 1. Total chlorophyll content decreased gradually in all temperatures up to 24 days of storage, but from 32nd day chlorophyll content at 4 to 5℃ decreased more rapidly as compared with that at 0 to 1℃.
Carotenoid content also decreased gradually, with no difference between two temperatures.
5. Vitamin C content decreased rapidly during the storage, but the degradation of vitamin C was somewhat inhibited more at 0 to 1℃ than 4 to 5℃.
6. The shelf life of nonpackaged leaf lettuce was 8 to 10 days, whereas that of packaged one extended to 32 days at 4 to 5℃ and 40 days at 0 to 1℃.
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