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Effect of hydrocooling and polyethylene package lining on maintaining green onion quality for export.

Atta-Aly, M. A.;

Annals of Agricultural Science (Cairo) Year: 1998 Vol: 43 Issue: 1 Pages: 231-249 Ref: 25 ref.

1998

บทคัดย่อ

Effect of hydrocooling and polyethylene package lining on maintaining green onion quality for export.

Green onions (cv. White Lisbon) were harvested, trimmed, washed and packed with or without previous hydrocooling in polyethylene (PE)-lined or unlined (exposed) cartons. Packed green onions were then held at room temperature (RT, 18 plus or minus 4 deg C) for 6 days or at 2 plus or minus 1 deg C for 2 weeks, followed by 2 days at room temperature (simulated retail holding period). Postharvest continuous growth, leaf deterioration and senescence, and visible pathogen infection developed more rapidly at RT than in cold storage. A fresh appearance without any significant visible deterioration was maintained for 1 week at 2 plus or minus 1 deg C if precisely hydrocooled and packed in PE-lined cartons, but for only 2 days at RT in unlined cartons. However, when the RT storage period was extended to 4 days, PE lining had a negative influence on onion quality. Two additional holding days at RT resulted in unmarketable green onions in all treatments. Postharvest continuous growth was particularly marked

 in onions packed in PE-lined cartons due to high atmospheric moisture. Symptoms of leaf deterioration and senescence were dominant in exposed packaging as a result of increased water loss. After simulated retail holding, PE-package lining was significantly superior to unlined packaging in maintaining the quality of green onion, especially with pre-hydrocooling. Chlorophyll and L-ascorbic acid contents decreased less rapidly with PE lining than in unlined cartons. In an air shipping trial (Egypt to London), hydrocooled green onions packaged without ice topping in PE-lined cartons were superior in quality upon reaching their final destination to those traditionally packed with ice topping in cartons enclosed in PE-bags. In addition, water leakage problems were overcome and a significant reduction in handling and air shipping costs were achieved.