ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Tolerance of peach and nectarine fruits to insecticidal controlled atmospheres as influenced by cultivar, maturity, and size.

Ke, D.; El-Wazir, F.; Cole, B.; Mateos, M.; Kader, A. A.;

Postharvest Biology and Technology Year: 1994 Vol: 4 Issue: 1-2 Pages: 135-146 Ref: 17 ref.

1994

บทคัดย่อ

ABSTRACT :

Tolerances of peach and nectarine fruits to insecticidal controlled atmospheres were determined by the time before occurrence of visual injury and/or off-flavour. The tolerances of John Henry peaches, Fantasia nectarines, Fire Red peaches, O'Henry peaches, Royal Giant nectarines, and Flamekist nectarines to 0.25% 02 (balance N2) at 20 deg were 2.8, 4.0, 4.0, 4.4, 5.1 and 5.2 days, respectively. Fairtime peaches tolerated 0.21% O2 + 99% CO2 at 20 deg for 3.8 days, 0.21% O2 + 99% CO2 at 0 deg for 5.0 days, 0.21% O2 at 20 deg for 6.0 days, and 0.21% O2 at 0 deg for 19 days. Soluble solids content, pH, titratable acidity and vitamin C content of Fairtime peaches were not significantly influenced by the low O2 and/or high CO2 treatments. There was a good correlation between tolerances of peaches and nectarines to the insecticidal atmospheres and the accumulation rates of acetaldehyde (r = -0.94, P < 0.02) and ethanol (r = -0.88, P < 0.01). The lower tolerance of John Henry peaches to 0.25% O2 was ass

ociated with a higher respiration rate, a more mature and larger fruit, and faster accumulation rates of acetaldehyde, ethanol and ethyl acetate. Generally, accumulation rates of anaerobic volatiles were higher in more mature and larger fruits of O'Henry peaches and Fantasia nectarines kept in 0.25% O2, air + 35% CO2 or 0.25% O2 + 35% CO2 at 20 deg . Comparison of fruit tolerance and published information on the time to reach 100% mortality of some insects suggests that 0.25% O2 at 20 deg is probably not suitable for postharvest insect disinfestation while 0.21% O2 with or without 99% CO2 at 0 deg merits further investigation.