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Effective Radiation Dose on Chitosan for Preservation of Mangoes (mangifera Indica)

Ashna Islam
Department of Environmental Sciences, Jahangirnagar University, Savar,Dhaka - 1342

Mubarak A. Khan
Institute of Radiation and Polymer Technology, Atomic Energy Research Establishment, GPO Box-3787, Dhaka-1000, Bangladesh.

Fahmida Parvin Mubarak A. Khan
Department of Environmental Sciences, Jahangirnagar University, Savar,Dhaka - 1342

Mahfuza Sharifa Sultana
Department of Environmental Sciences, Jahangirnagar University, Savar,Dhaka - 1342

Abstract/ Executive Summary:

The effective dose of γ radiation on chitosan for chitosan solution was irradiated with at various total doses (50 soaked in un-irradiated and irradiated chitosan solutions and then they were stored at normal room temperature. The percentage of weight loss, color change and percentage of spoilage were observed for 15 days in control, un-irradiated and irradiated chitosan coated mangoes. The overall results showed the superiority of 50 kGy and 100 kGy irradiated chit control, un-irradiated and 120 kGy to 200 kGy irradiated chitosan.

Keywords: Gamma radiation, Chitosan, Shelf-life

Location: Department of Environmental Sciences, Jahangirnagar University, Savar

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Mango

Objectives:

1. To evaluate the effective dose of irradiation of chitosan for long time preservation of mangoes and to evaluate the dose from which the coating will be less effective.

Methodology:

Mangoes (Ashina ilsha peti) were harvested from Paharbhanga, Thakurgaon district, Bangladesh and Chitosan was prepared from prawn shell in laboratory. Sample preparation - The chitosan solution was prepared as 2 gm chitosan in 2% acetic acid (CH₃COOH) solution. Then the solution was irradiated by gamma radiation from Co- 60 source at 50 kGy, 100 kGy, 120 kGy, 150 kGy, 180 kGy and 200 kGy at a dose rate of 13 kGy/h. 24 mature-green mangoes without infection and mechanical injuries were selected. They were washed with water, then dip in hot water for 5 minutes and then dried in air. Mangoes were soaked in irradiated chitosan solutions for 2 minutes and dried naturally in air. Fruits were stored in cases at dust free condition in room temperature. Samples for preservation with un-irradiated chitosan solution were also prepared at the same time for comparison. 3 mangoes were stored without chitosan coating, which were known as control mangoes. Two types of sample were prepared by chitosan solution. Type 1: mangoes were soaked for 2 minutes in chitosan solution at the day of storage and observed up to 15 days. Type 2: mangoes were soaked in chitosan solution at the day of storage and chitosan solutions were sprayed to these mangoes at 5 days interval and observed up to 15 days. Properties on Weight Loss (%) in Mangoes, Spoilage were measured.

Source of Information: Jahangirnagar University Environmental Bulletin, Vol.2, 35-40,2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In this study, it was found that the shelf life of 50 kGy and 100 kGy irradiated chitosan coated mangoes were higher than 120 kGy to 200 kGy irradiated chitosan coated mangoes. The percentage of weight losses and percentage of spoilage were higher in 120 kGy to 200 kGy irradiated chitosan coated mangoes than 50 kGy and 100 kGy irradiated chitosan coated mangoes. Further, it was found that the mangoes which were soaked in chitosan solution for only one timeat the initial day of storage and the mangoes which were sprayed with chitosan solution after 5 days interval showed similar results.

Knowledge Management: Journal