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Journal of Pharmacognosy and Phytochemistry
Vol. 9, Special Issue 4 (2020)
Comparative study of different drying techniques of dragon fruit peel
Author(s): Aparna Gautam and Sayyad Abdul
Abstract: Dragon fruit (Hylocereus polyrhizus) peel is the major by-product left over from either fresh consumption or fruit processing. The peel is accounted for about one-fourth of the whole fruit. Dragon fruit peel contains some valuable components such as antioxidants, vitamin C betalain compound and pectin. Its properties are needed to be exploited and understood for its better utilization. The aim of this work is to investigate the drying of dragon fruit peel pulp by Refractance Window Drying (RWD) and the effects of process conditions on the drying rates and color difference on the Characteristic of the final dried powder and to compare the RWD with hot air drying and freeze drying for the production of dried dragon fruit peel powder. The heating water temperature of 95°C and pulp thickness of 3.5 mm were selected for RW drying of dragon fruit peel pulp. The powder characteristics were assessed from its drying time, and colour difference. The shorter drying time of 42 min was observed in RWD of the peel. The drying time of RWD dried peel powder was very less as comparison to hot air drying and freeze drying. The colour analysis of the dried samples yields that the colour of the freeze-dried sample was good but the colour of RWD sample was far better than the hot air-dried sample. In conclusion the RWD time of dragon fruit peel was very short and the colour of the sample was better and can be used as a natural colorant. However, the properties of RWD dragon fruit peel powder need to be evaluated to check the suitability as natural colorant.
How to cite this article:
Aparna Gautam and Sayyad Abdul. Comparative study of different drying techniques of dragon fruit peel. 2020; 9(4S): 280-283.