ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of coatings on quality of Florida Valencia oranges stored for summer sale.

Peeples, W. W.; Albrigo, L. G.; Pao, S.; Petracek, P. D.;

Proceedings of the Florida State Horticultural Society Year: 1999, publ. 2000 Issue: No. 112 Pages: 126-130 Ref: 17 ref.

2000

บทคัดย่อ

Florida cv. Valencia oranges (Citrus sinensis) were commercially harvested near Haines City, Florida (USA) on 1 May 1996 and 10 May 1998 for use in prolonged storage (20 to 22 weeks) experiments at low temperature (3 to 4 deg C). The purpose of the study was to assess the influence of carnauba-, polyethylene-, and shellac-based coating formulations on the quality of oranges stored at low temperature. The formulations were tested with or without 2000 ppm imazalil. The performance of formulations was based on weight loss control, gas levels (O2, CO2, and ethanol) within the fruit, juice headspace ethanol levels and flavour, and fruit appearance. The effects of washing and carton lining with a polyethylene film were also assessed. Of the coatings, fruits with the polyethylene coating with imazalil lost the least weight over 22 weeks (0.075% per day), whilst maintaining low anaerobic respiratory products, and maintaining good internal quality under extended cold storage conditions. In a second exper

iment, the washing and lining treatment resulted in the lowest total weight loss of 2.38% over 20 weeks. Shellac-based coatings were not optimal for extended storage due to their relatively poor control of water loss and low permeability to O2 and CO2, which lead to off-flavour development within 5 to 10 weeks of storage and, with long-term storage, fruit physiological breakdown.