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Changes in Physical Properties of the Postharvest Mango (mangifera Indica L) Influenced by the Physical Stimuli

M. Khairul Islam
Department of Crop Science and Technology, University of Rajshahi, Bangladesh

Abstract/ Executive Summary:

The post harvest changes of the two types of mangos (viz., The Langra and The Khirshapat) were examined using control, paraffin coating, perforated polyethylene cover, unperforated polyethylene cover, hot water (55±2)?, and low temperature (4±1)?. The information’s obtained from the investigation demonstrated the significant variation of varieties in terms of the mean of all the characters studied. The Langra accumulated a greater quantity of edible portion, pulp to peel ratio, dry matter and ash content in comparison with the Khirshapat, whereas the Khirshapat lost a great amount of physiological weight and stored more moisture over the Langra during storage. The treatments implied to the experiment showed significant variation in respect of the mean of physical properties of the post harvest mango at different storage time. The results elucidated that edible portion, pulp to peel ratio, physiological weight loss, and moisture content significantly increased, but dry matter and ash content progressively decreased from the untreated mangoes with the advance of the storage time, but low temperature delayed the changes to some extent. Un-perforated polythene cover was noticed to be the best in the reduction of physiological weight loss. The combined effect of varieties and post harvest treatments were found to be non-significant in most of the characters studied. Edible portion and pulp to peel ratio slightly augmented up to a certain point of the existing metabolic activities, thereafter they decreased, and dry matter and ash content mildly decreased from the Langra using no treatment. On the other hand, the Khirshapat along with the control progressively lost their physiological weight and also received more moisture content with the passing of storage period. The minimum physiological weight loss was obtained from the Langra along with un-perforated polythene cover.

Keywords: Postharvest, Mango, Varieties, Physical stimuli, Storage

Location: Shibgonj, Chapai Nowabgonj, Rajshahi city

Start Date: 00-00-0000

End Date: 00-00-0000

Program Area: Postharvest and Agro-processing

Commodity: Mango

Objectives:

To determine changes in physical properties of the post harvest mango (mangifera indica l) influenced by the physical stimuli

Methodology:

The mature but unripe green mango varieties (the Langra and the Khirshapath) were obtained from a greater mango growing areas of Kansart of Shibgonj Upazila of Chapai Nowabgonj district and the other materials used as post harvest treatments viz., paraffin wax and polyethylene cover were received from the local market of Rajshahi city. The experiment comprised of two factors and assigned in Randomized Complete Block Design (RCBD) with three replicates. Each block contained 12 treatments. The Langra (V₁) and the Khirshapat (V₂) were treated with the control = T₀, paraffin coating (PC) =T₁, perforated polythene cover (PPC) =T₂, un-perforated polythene cover (UPC) =T₃, hot water {HW (55± 2)? =T₄, and low temperature {LT (4± 1)}?=T₅. The post harvest treated mangos were arranged at random in each block. They were carefully sorted after harvest. The skin of the fruits was cleaned with the help of a cloth just after harvesting. The treated fruits were arranged on brown paper at the laboratory floor at ambient condition. Specific treatment of each blocks contained six fruits of which, one was put aside to record the changes in physiological weight loss. The remaining five mangos were kept in a deep refrigerator (-85?) for recording the data periodically at five different dates at 3 days’ intervals. Finally, the reserved mangos were analyzed for the investigation. Eighteen mangoes of each genotype were selected at random from a mango basket and the fruits were placed on brown paper at ambient condition. Paraffin coating: Solid paraffin wax was made liquid by heating in a large aluminum pot. Eighteen fruits from both the varieties were quickly put into the liquid paraffin wax in an aluminum pot. Care was taken to ensure a uniform coating on all the fruits, and thereafter kept on brown paper for observation. Perforated polyethylene covers: The 19 cm × 15 cm sized polyethylene covers were perforated with scissors at nine equal positions of the bags. Individual fruit was taken into the polyethylene cover and the open portion of the bag was sealed with burning. Eighteen fruits of each genotype were bagged in this system and then placed on brown paper for next observation. Un-perforated 19 cm × 15 cm sized polyethylene covers were used for this treatment. Eighteen fruits of each variety were kept into it, and the top of the bag was tied by burning and then placed on brown paper for observation. Hot water treatment: Tap water was heated in hot water bath (55 ± 2)⁰C. and the fruits were individually dipped into it for a period of 5 minutes and then stored at ambient condition on brown paper. Fruits were stored in a refrigerated incubator (4±1)⁰C. Low temperature: Mangos were stored in a refrigerated incubator at (4±1)? maintaining the temperature by adjusting the button on the incubator. The collected data was statistically analyzed by variance method. The means of different parameters was compared using DMRT.

Source of Information: Bangladesh J. Fruit Sci. & Tech. 2 (1& 2): 153-160 (2011), ISSN 2218-6824

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Edible portion, pulp to peel ratio, physiological weight loss, and moisture content significantly increased, but dry matter and ash content progressively decreased from the untreated mangoes with the advance of the storage time, but low temperature delayed the changes to some extent. Un-perforated polythene cover was noticed to be the best in the reduction of physiological weight loss. The combined effect of varieties and post harvest treatments were found to be non-significant in most of the characters studied. Edible portion and pulp to peel ratio slightly augmented up to a certain point of the existing metabolic activities, thereafter they decreased, and dry matter and ash content mildly decreased from the Langra using no treatment. On the other hand, the Khirshapat along with the control progressively lost their physiological weight and also received more moisture content with the passing of storage period. The minimum physiological weight loss was obtained from the Langra along with un-perforated polythene cover.

Knowledge Management: Journal