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Response of Mineral Constituents and Storability of the Postharvest Mango (mangifera Indica L.) to Different Storage Treatments

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

Abstract/ Executive Summary:

Efficacy of storage treatments, namely control, paraffin coating, perforated polyethylene cover, unperforated polyethylene cover, hot water (55±1 ⁰C) and low temperature (4±1 ⁰C) on behavioral pattern of mineral constituents and storability of the two postharvest mango genotypes (viz., Langra and Khirshapat) was examined in the sophisticated laboratory of SRDI, Rajshahi, Bangladesh during the period from June, 2011 to September, 2012. The results of the investigation obtained from genotypes appeared predominant variation in terms of most of the characters studied in the laboratory situation. The Langra enriched a greater amount of P, Mg, Fe and Mn over the Khirshapat and the process of enrichment was gradually increased with the advance of storage period up to the last edible stage. The Khirshapat showed a greater performance in producing of Ca, Cu and Zn, and longer shelf life in comparison with the Langra at all the storage times. The mineral constituents of mango pulp were also changed during storage period. Low temperature (4±1⁰C) was found to be more effective in retaining the original green color of mangos for a period of time, but it caused chilling injury and fruits did not ripen at all after removal from low temperature. Paraffin coating was assumed to be better in retarding the ripening process of the postharvest mango, which might be easily adopted by common people for the mango storage.

Keywords: Genotypes, Mango, Minerals, Storage treatments, Storability

Location: Kansat of Shibgonj Upazila of Chapai Nowabgonj district, Bangladesh

Start Date: 00-05-2012

End Date: 00-09-2012

Program Area: Postharvest and Agro-processing

Commodity: Mango

Objectives:

1. To finf the efficacy of storage treatments, namely control, paraffin coating, perforated polyethylene cover, unperforated polyethylene cover, hot water (55±1⁰C) and low temperature (4±1⁰C) on behavioral pattern of mineral constituents and storability of the two postharvest mango genotypes (viz., Langra and Khirshapat).

Methodology:

Mature but green of two mango genotypes, namely the Langra and the Khirshapath picked out for experimental materials were assembled from one of the highest mango growing areas of Kansat of Shibgonj Upazila of Chapai Nowabgonj district, Bangladesh and other components used as storage treatments viz., paraffin coating and polyethylene cover were bought from Royal Scientific shop at cooperative market of Rajshahi city. The mango genotypes were treated with different storage treatments viz. control, paraffin coating (PC), perforated polyethylene cover (PPC), unperforated polyethylene cover (UPC), hot water (HW) (55±2⁰C) and low temperature (LT) (4±1 ⁰C) in the laboratory of the Department of Biochemistry and Molecular Biology, University of Rajshahi, Bangladesh. The experiment consisted of two factors and assigned in randomized complete block design with three replicates. Solid paraffin wax was made liquid by heating in a large aluminum pot. The 19 cm × 15 cm sized polyethylene covers were perforated with scissors at nine equal positions and some of another 19 cm × 15 cm sized polyethylene covers were not perforated and used as unperforated polythelene cover. The tap water was heated in a hot water bath (55 ± 2⁰C) for a period of 5 minutes. The mangoes were stored in a refrigerated incubator at 4±1⁰C temperature. The temperature of the refrigerated incubator was maintained by adjusting the button on the incubator. The fruits were treated with different prepared storage treatment and kept on brown paper in three blocks. Each block contained twelve treatments in which six fruits were arranged in an individual treatment, one was put aside to record the shelf life and the remaining five fruits were preserved in a deep refrigerator (-85 ⁰C) covered with an extra polyethylene bags at the laboratory to record the data periodically at five different dates at 3 days’ intervals. Five mangos from individual treatment of each block were chemically analyzed. Mineral constituents of mango pulp were determined using a scientific method. Ground mango pulp was digested and P, Ca, Mg, Cu, Fe, Mn and Zn were released by digestion with nitric acid, and Ca, Mg, Cu, Fe, Mn and Zn were determined by Atomic Absorption Spectrophotometer (AAS) while P was determined by Ultra Violet Spectrophotometer (UVS).

Source of Information: J. Environ. Sci. & Natural Resources, 6(1): 69 - 77, 2013; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The two mango genotypes, used in the experiment, namely the Langra and the Khirshapat are very nutritious, tasteful and popular fruits in Bangladesh. But the nutritional qualities between genotypes vary in manifold. Comparatively, the Langra enriches in plenty of mineral elements over the Khirshapat.

Knowledge Management: Journal