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Behavioral Pattern of Physicochemical Constituents of the Postharvest Mango (mangifera Indica L.) Influenced by Storage Stimuli

Md. Khairul Islam
Department of Crop Science & Technology, University of Rajshahi, Bangladesh

Abstract/ Executive Summary:

An investigation was carried at the laboratory of the Department of Biochemistry and Molecular Biology, University of Rajshahi, Bangladesh during the period from May, 2010 to September, 2011 to study the behavioral pattern of some physicochemical constituents of the mango pulp. The experiment was comprised of two popular mango cultivars in Bangladesh (viz., Langra and Khirshapat) and six storage stimuli, namely control, paraffin coating, perforated polyethylene cover, unperforated polyethylene cover, hot water (55±1°C) and low temperature (4±1°C). The two factors experiment was assigned in randomized complete block design with tree replicates. The varieties had profound variation in terms of most of the characters studied in the laboratory condition. Initially the Langra significantly enriched a greater amount of vitamin C (151.23 mg/100 g) and titratable acidity (4.31%) and these were decreased gradually with the progress of storage period. The Khirshapat showed higher pulp pH (5.83); produced enormous amount of TSS (18.00%) and sugar (TS = 17.62%, RS = 6.51% and NRS = 11.06%) content at 12th day of storage. The pH, TSS, sugar (TS, RS and NRS) content of mango pulp was rapidly increased, whereas vitamin C and titratable acidity decreased drastically from the untreated mangoes. On the other hand, low temperature retarded the changes. The Langra using low temperature (4±1°C) exhibited lower diminishing tendency in vitamin C and titratable acidity and also using no treatment slightly increased TSS; enriched enormous amount of sugar (TS, RS and NRS). Therefore, low temperature (4±1°C) was found satisfactory for delay ripening and postharvest changes of mango in storage condition.

Keywords: Postharvest, Mango, Cultivars, Storagr stimuli, Physicochemical constituents

Location: Department of Crop Science & Technology, University of Rajshahi

Start Date: 00-05-2010

End Date: 00-09-2011

Program Area: Quality and Nutrition

Commodity: Mango

Objectives:

To study the behavioral pattern of some physicochemical constituents of the mango pulp.

Methodology:

Experimental materials and design: Mature but unripe green mango cultivars, namely the Langra and the Khirshapath were assembled from Kansart of Shibgonj Upazila of Chapai Nowabgonj district and the other materials used as storage stimuli viz., paraffin wax and polyethylene cover were taken from Royal scientific store at cooperative market of Rajshahi city. The experiment was comprised of two factors and laid out in Randomized Complete Block Design (RCBD) with three replicates. The cultivars [viz., Langra (V₁) and Khirshapat (V₂)] were treated with control = T₀, Paraffin Coating (PC) = T₁, Perforated Polythene Cover (PPC) = T₂, Un-perforated Polythene Cover (UPC) = T₃, Hot Water (HW) (55± 2°C) = T₄ and Low Temperature (LT) (4± 1°C) = T₅. Each block contained 12 treatments.

Preparation of storage stimuli: Solid paraffin wax was made liquid by heating in a large aluminum pot. The 19x15 cm sized polyethylene covers were perforated with scissors at nine equal positions of the bags and the same sized polyethylene covers were also used as unperforated polythelene cover. The tap water was heated in a hot water bath (55±2°C) for a period of 5 min. Mangoes were stored in a refrigerated incubator at 4±1°C temperature. The temperature of the refrigerated incubator was maintained by adjusting the button on the incubator.

Studied parameter: Vitamin C and Titratable acidity of the mango pulp was estimated by the titrimetric method. The pulp pH was determined using pH 7 and 4 buffer tablets (BDH chemicals Ltd., Poole, England).Total Soluble Solid (TSS) content of mango pulp was estimated by using Abbe Refractometer. Temperature correction was done using the standard methods. Total Sugar (TS) content of mango pulp was determined calorimetrically. Reducing Sugar (RS) content of mango pulp was determined by Acid Method. Non-Reducing Sugar (NRS) content of the mango pulp was calculated as:

NRS (%) = TS-RS

Statistical analysis: The collected data was statistically analyzed by analysis of variance method. The means of different parameters was compared using DMRT.

Source of Information: Pakistan Journal of Biological Sciences, 16: 1985-1990; ISSN 1028-8880

Article Link (Online Journal): DOI: 10.3923/pjbs.2013.1985.1990; URL: http://scialert.net/abstract/?doi=pjbs.2013.1985.1990

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The two mango cultivars, mentioned in the investigation, namely the Langra and the Khirshapat are very much popular fruit crops in Bangladesh. But the pattern of physicochemical constituents of the two cultivars varies in manifold. Comparatively, the Langra enriches in plenty of vitamin C and titratable acid content as compared to the Khirshapat. On the other hand, Khirshapat showed a better performance for the production of TSS and sugar content over the Langra. It is found that vitamin C and titratable acid content decrease and pulp pH, TSS and sugar content increase with the advance of storage period. There also appears differentiation in the influence of different postharvest storage stimuli. The effect of control accelerates in the reduction of vitamin C and titratable acid content and influences in increasing in pulp pH, TSS and sugar content whereas, the effect of low temperature retards in the reduction of vitamin C and titratable acid content and also accelerates in the increase of pH, TSS and sugar content in the mango pulp which may help in mango storage in future.

Knowledge Management: Journal