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Effects of hot air treatment on postharvest quality of ‘cat Hoa loc’ mangoes

Published online by Cambridge University Press:  05 August 2010

Thai Thi Hoa ,
Do Minh Hien ,
Guy Self  and
Marie-Noelle Ducamp
Thai Thi Hoa
Affiliation:
 Southern Fruit Research Institute, PO Box 203, My Tho, Tien Giang, Viet Nam
Do Minh Hien
Affiliation:
 Southern Fruit Research Institute, PO Box 203, My Tho, Tien Giang, Viet Nam
Guy Self
Affiliation:
 Cirad, Persyst, UMR QUALISUD, TA B-95 / 16, 73 rue Jean François Breton, 34398, Montpellier Cedex 5, France
Marie-Noelle Ducamp*
Affiliation:
 Cirad, Persyst, UMR QUALISUD, TA B-95 / 16, 73 rue Jean François Breton, 34398, Montpellier Cedex 5, France
*
* Correspondence and reprints
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Abstract

Introduction. Vietnam is among the world's top 20 mango producing countries. In this country, the ‘cat Hoa loc’ variety is predominant, with 17 692 ha under cultivation with an annual production of 58 471 t; it is considered to be the best mango variety in the Mekong delta. Ripening of the fruit is typically expressed by a skin colour change from green to bright yellow. This variety is highly prized by local and foreign consumers, but subject to different disorders, especially fruit fly infestations. Heat treatment is a safe alternative to chemical treatments. It can impair mould development and control fruit infestation by destroying fruit fly eggs and larvae. It may have a greater or lesser effect on fruit physiology. If the treatment temperature and duration are incorrectly handled, skin burns may result and the internal quality of the fruit may be affected. Materials and methods. ’Cat Hoa loc’ mangoes at the commercially mature stage were subjected to hot air treatment (47 °C and 90% RH) of different durations [(0, 20, 40, 60, 90, 120 and 180) min from the fruit core attaining the temperature]. After treatment, the fruits were stored at 25 °C and quality parameters evaluated (weight loss, peel and flesh colour, percentages of fruit with burns and rots, burn index, ripening percentage, firmness, TSS, TA, vitamin C content, pH, reducing and total sugars, and taste test). Results and discussion. For the ‘cat Hoa loc’ variety, heat treatment accelerated ripening of the fruit in the initial storage period and colour changes occurred more quickly. However, after 7 days' storage, the difference in Hue value between the treated and control fruits disappeared. Hot air treatment at 47 °C of different durations [(20 to180) min] did not affect the internal coloration changes of ‘cat Hoa loc’ mangoes, but did affect the flesh firmness. We found that, after 3 d, hot air treatment at 47 °C led to significantly faster weight loss than control fruits but this difference disappeared after 7 d. Total sugar content was not affected by the treatment, but titratable acidity decreased more quickly in treated fruits.

Keywords

VietnamMangifera indicafruitspostharvest controlheat treatmentqualityViet NamMangifera indicafruitslutte après récoltetraitement thermiquequalitéVietnamMangifera indicafrutascontrol de postcosechatratamiento térmicocalidad
Type
Technical paper
Information
Fruits , Volume 65 , Issue 4 , July 2010 , pp. 237 - 244
Copyright
© 2010 Cirad/EDP Sciences

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