บทคัดย่องานวิจัย

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Effect of packaging treatments and vacuum-cooling on quality of winter harvested iceberg lettuce.

Martinez, J. A.; Artes, F.;

Food Research International Year: 1999 Vol: 32 Issue: 9 Pages: 621-627 Ref: 18 ref.

1999

บทคัดย่อ

Effect of packaging treatments and vacuum-cooling on quality of winter harvested iceberg lettuce.

Heads of winter harvested iceberg lettuce (cv. Coolguard) individually packed or sealed in perforated (22 micro m thickness) or unperforated (25, 30 or 40 micro m thickness) polypropylene films were stored for up to 2 weeks at 2 deg C (storage period) and then held for 2.5 days at 12 deg C (shelf-life period). Five packaging treatments together with passive or active modification of the atmosphere within the package were compared. Vacuum-cooling was superimposed on these five treatments. Weight loss, wilting, physiological disorders, bacterial decay and quality were monitored. In all treatments, pink rib and russet spotting occurred to a slight degree. Brown stain and heart leaf injury were detected only on heads in unperforated bags. Low oxygen was generally related to a high quality score. Passive modified atmosphere packaging in 40 micro m polypropylene and active (initial 5% O2 and 0% CO2) modified atmosphere packaging in 30 micro m polypropylene were the best treatments for overall visual q

uality. Vacuum-cooling reduced both pink rib and heart leaf injury but the effect showed up only during shelf life.