Effects of Ethrel, packaging and waxing on quality and shelf life of guava (Psidium guajava L.) fruits

Mohamed E. Elkashif, Eltaya A. Hamdoun, Osman M. Elamin, Haroon I. Mahmoud


Guava is one of the most popular fruits in the Sudan. It is usually harvested at the ripe stage which results in quick deterioration and huge post-harvest losses. Therefore, the objective of this work was to find out the effects of Ethrel, packaging and waxing on quality and shelf life of guava (Psidium guanjava L.) fruits. Experiments were conducted at the University of Gezira, Wad Medani, Sudan, during December of 2013 and  March of  2014. Guava fruits were harvested at the mature-green stage and treated with Ethrel or left as control. Fruits were packaged in either intact or perforated polyethylene film, waxed or left unpackaged. The treatments were set up in a completely randomized design with two replicates. Results showed that Ethrel treatment significantly accelerated the rate of fruit ripening as shown by an increase in total soluble solids, skin colour development, vitamin C content, taste and a decrease in fruit firmness in both seasons. Packaging and waxing treatments had significant effects on weight loss, TSS, vitamin C content, firmness, taste and skin colour in both seasons. Packaging guava fruits in intact polyethylene film resulted in the lowest weight loss, followed by waxing, perforated polyethylene film and the highest weight loss was recorded for the control treatment in both seasons. The highest vitamin C  content, the best  skin colour and the longest shelf life were recorded in fruits packaged in intact polyethylene film followed by perforated, waxing and control treatments in both seasons. However, the highest TSS content, the best taste and the shortest shelf life were recorded for the control fruits in both seasons. It could be  recommended that, in order to prolong the shelf life and maintain the quality of guava fruits, they should be packaged in intact polyethylene film or waxed and treated with Ethrel at destination markets.


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