บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of the rate and duration of forced air cooling on the quality of imperial apricots and pioneer and Songold plums.

Jooste M.M., Khumalo P.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.72

2004

บทคัดย่อ

Effect of the rate and duration of forced air cooling on the quality of imperial apricots and pioneer and Songold plums. Gel breakdown (GB) and overripeness (OR) remain the biggest internal problems with Imperial apricots which makes the biggest contribution to the total volume of apricots exported from South Africa per annum.Pioneer, an early season South African plum cultivar, ripens quickly o­n and off the tree which results in rejections for soft fruit at packing and o­n arrival overseas.Songold, a yellow, midseason plum cultivar tends to develop GB and OR during cold-storage in some seasons, which renders the fruit inedible and results in high refection rates.

Prompt cooling and good temperature management are essential to lower the rate of physiological deterioration of stone fruit.In some instances, FAC can take as longas 48 to 72 h, depending o­n the type of packaging, in some of the commercial depots where FAC is applied o­n stone fruit in South AfricaThe trial fruit was subjected to the following FAC rates at a delivery air temperature of –1.0 °C to a pulp temperature of –0.5 °C: 6 h, 12 h, 24 h stepwise cooling and 48 h stepwise cooling for the apricot, and 12 h, 24 h, 48 h stepwise cooling, and 72 h stepwise cooling for the two plum cultivars.The fruit was evaluated after a cold-storage and a simulated shelf-life period.The trial was conducted in two consecutive seasons.

Imperial apricots had the best internal quality after 8 h of FAC, Pioneer plums were not sensitive to FAC rate or duration, and Songold plums had the best internal quality when FAC was applied for 12 h and longer.This result o­n the plums demonstrates that cultivar differences must be considered when drawing up handling protocols for stone fruit, as a blanket recommendation may lead to the induction of quality defects.