บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of decreasing oxygen levels in the storage atmosphere on the respiration and production of volatiles of Idared apples.

Gasser F., Hoehn E.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.70

2004

บทคัดย่อ

Effect of decreasing oxygen levels in the storage atmosphere on the respiration and production of volatiles of Idared apples. Based o­n the concept of dynamic CA-storage, the effect of stepwise decreasing oxygen levels in storage atmosphere has been assessed for ‘Idared’ apples.Considered was the storage duration under LO-conditions (4 °C, 1.5% CO2, 1.0% O2) of the fruit prior to measurements (0, 5 and 8 months).‘Idared’ apples are known to be susceptible to chilling injury below 3 °C and sensitive to CO2 above 3%.During oxygen reduction temperature was held at 4 °C and 1 °C, respectively, and CO2 concentration was held at a constant level of 1.5% and 4.0%, respectively.Respiration rate and the production of ethanol and total volatiles were monitored daily for individual fruit.

Regardless of temperature and CO2 concentration during oxygen reduction, all fruit showed an identical anaerobic compensation point (ACP), below which CO2 production increased significantly.Oxygen concentration at the ACP was 0.37% just after harvest as well as 5 months after harvest, and decreased then to 0.017% after 8 months storage duration.Fruit held at a temperature of 1 °C showed the same or a slightly higher level of oxygen consumption compared to fruit held at 4 °C, a respiratory pattern which may be expected as a response of fruit to stress.

The evolution of total volatiles of apples exposed to decreasing oxygen levels paralleled that of ethanol as determined using solid phase microextraction (SPME) technique.The rate of volatile or ethanol production was constant or decreased slightly with decreasing oxygen level, and increased twice to fourfold for the volatiles and up to ten fold for ethanol at or below the ACP.