136 DIFFERENTIAL SCANNING CALORIMETRY (DSC) OF AVOCADO AND MANGO FRUITS STORED IN AN INSECTICIDAL ATMOSPHERE

• Published in: HortScience Vol. 29; no. 5; p. 448
• Main Authors: Yahia, Elbadi M, Dominguez, Marisela Rivera
• Format: Journal Article
• Language: English
• Published: 01.05.1994
• ISSN: 0018-5345; 2327-9834
• DOI: 10.21273/HORTSCI.29.5.448b

Modified and controlled atmospheres with ≤ 0.5% O 2 and/or ≥ 50% CO 2 are insecticidal. In previous studies we have found that avocado is very sensitive and mango is very tolerant to these atmospheres. We used DSC to study the differences in response between these two fruits, and to relate that with their sensitivity/tolerance to hypoxia. Fresh or lyophilized tissues of fruits stored in air or in an insecticidal atmosphere were scanned at a temperature range of 10 to 145°C at a rate of 10°C/min. There were qualitative and quantitative differences between thermograms. There were fewer endotherms in thermograms of fresh tissue samples than in lyophilized tissue samples. Avocado thermograms showed a major endotherm at ca 15°C and 2 minor endotherms at ca 105-110°C. In addition, mango heating thermograms showed another major endotherm at ca 80°C. This endotherm was not present in the heating thermograms of avocado. and might represent a contributing factor in the tolerance of mango to insecticidal atmospheres.