ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

MAP of apple fruit: effect of cultivar, storage duration, and carbon dioxide on the lower oxygen limit.

Deng, W. M.; Fan, L. H.; Song, J.; Mir, N.; Verschoor, J.; Beaudry, R. M.;

Postharvest Horticulture Series - Department of Pomology, University of California Year: 1997 Issue: No. 16 Pages: 156-161 Ref: 5 ref.

1997

บทคัดย่อ

Various masses of uniform apple fruits (cultivars Gala, Golden Delicious and Starkrimson Delicious, harvested at commercial maturity) were sealed in low density polyethylene (LDPE) packages and stored at 0 deg C. The headspace of the packages was sampled monthly for 4 months and analysed for O2, CO2 and ethylene content. O2 uptake, CO2 production and ethylene production were calculated based on film permeability. The respiratory quotient (RQ) breakpoint, determined as the O2 level at which the RQ rose 10% above aerobic levels, was dependent on CO2, cultivar and storage duration. The RQ breakpoint decreased with storage duration but was unaffected by CO2. However, the tolerance to low O2 was reduced by CO2 presence, as determined by internal and external tissue damage. Under the same O2 partial pressure, higher O2 uptake was found in the absence of CO2. This may reflect the action of CO2 on ethylene production. When the O2 partial pressure increased from 0.2 to 1.5 kPa, O2 uptake increased wherea

s RQ dramatically decreased. However, further increase in O2 concentration had almost no effect on RQ and respiration rate. The RQ breakpoints of Gala, Golden Delicious and Starkrimson Delicious fruits were at 0.65 kPa, 0.75 kPa and 0.8 kPa O2, respectively. As O2 partial pressure declined, the rate of ethylene production declined for all 3 cultivars. The data suggest fruits of the 3 cultivars may be stored together at 0.9-1.0 kPa O2.