Effect of Heat Treatments on Chilling Injury in Ripe Irwin Mango Fruit (Mangifera indica L.) and Its Possible Mechanism
Date Issued
2010
Date
2010
Author(s)
Kao, Chen-Yu
Abstract
‘Irwin’ mango (Mangifera indica L.) is one of the major export fruit products in Taiwan. Since Taiwan is an epidemic area of oriental fruit fly, quarantine treatment is required for exporting mango fruit to markets absent from this insect. However, there are some drawbacks of vapor heat treatment, the current quarantine treatment for mango in Taiwan, such as high treatment fee, facility availability limitation, and heat damage risk. The fact that the chilling tolerance of ripe ‘Irwin’ mango fruit is better than mature-green counterpart has made cold quarantine treatment possible in this commodity. Unfortunately, ripe ‘Irwin’ mango suffered chilling injury and quality deterioration under 1℃ for 2 weeks, the condition for disinfestation of oriental fruit fly. In order to extend the shelf life of mango fruits under cold storage and to establish optimum condition for cold quarantine treatment, this research first to observe the influence of different storage temperatures on ripe ‘Irwin’ mango, and then to investigate the effects of various prestorage heat treatments on chilling injury alleviation on mango after 0℃ storage for 2 weeks as well as its possible mechanism.
The optimum storage temperature for ripe ‘Irwin’ mango was 5℃, because of slow rates of chilling injury and disease appearance when compared with other trials. Chilling injury symptom of ripe ‘Irwin’ mango was observable by eyes after storage at 0℃ for two weeks, and the symptom became more severe with storage time. After the cold storage and 3 additional day at 20℃, the browning of fruit peel was more obvious, and the electrolyte leakage percentage increased from 26.85% to 60.23%; the L* value of skin color decreased from 46.69 to 40.56; the a* value dropped to 15.18 from 23.26; the firmness and titratable acidity declined from 0.37 kg cm-2 and 0.25% to 0.25 kg cm-2 and 0.18%, respectively. The percentage of electrolyte leakage and a* values showed a good correlation (R2
Subjects
mango
chilling injury
heat treatment
antioxidant enzyme
Type
thesis
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