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Postharvest quality changes of fall-season lance Asia bell roots as influenced by storage temperature and packaging methods.

Park YounMoon;

Journal of the Korean Society for Horticultural Science Year: 2000 Vol: 41 Issue: 4 Pages: 369-373 Ref: 14 ref.

2000

บทคัดย่อ

Postharvest quality changes of fall-season lance Asia bell roots as influenced by storage temperature and packaging methods.

Fall-season lance Asia bell roots (Codonopsis lanceolata Benth. et Hook.) were stored at two different temperature using various packaging methods to reduce storage losses and to enhance marketing quality of processed roots. The roots were harvested in late November and stored in simulated cold storage chambers at 0 and -2 deg C using small-unit packages. Commercial-scale storage was also conducted at 0 deg C using large- and small-unit packaging methods. In simulated storage, film packaging effectively reduced the weight loss and shrinkage from drying of the roots, while increased the incidence of surface mould and sprouting. Lowering storage temperature to -2 deg C, in contrast, increased weight loss and shrinkage while significantly reducing the surface mould infection and sprouting. In commercial storage, MA packaging with 0.05 to 0.06 mm PE film reduced surface mould infection and sprouting while keeping weight loss low and flesh tissue sound. Tight packaging of 30 kg roots, however, result

ed in flesh softening and rapid discoloration during the marketing period. Analysis of gas concentrations inside MA packages indicated that low oxygen below 1% could induce physiological disorders in roots and that visual symptoms developed after storage. Needle-hole perforation treatment on the 0.05 mm films or use of commercially manufactured 0.06 mm zipper bags with a certain amount of gas exchange seemed to be effective methods to avoid such injuries, but were associated with higher percentage sprouting partly caused by relatively high oxygen inside the package. Lance Asia bell root storage was best at lower temperatures (-2 deg C) in combination with needle hole perforation treatment for large-unit packaging or with commercially-made zipper bags for small-unit packaging.