Determining pigment extraction efficiency and pigment stability of dragon fruit (Hylocereus polyrhizus)

Rebecca, O.P.S. and Zuliana, R. and Boyce, A.N. and Chandran, S. (2008) Determining pigment extraction efficiency and pigment stability of dragon fruit (Hylocereus polyrhizus). Journal of Biological Sciences, 8 (7). pp. 1174-1180. ISSN 1727-3048, DOI https://doi.org/10.3923/jbs.2008.1174.1180.

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Abstract

Pigment extracted from the pulp of Hylocereus polyrhizus showed a difference in colour when subjected to room temperature extraction and 110°C extraction. The room temperature extraction yielded red-purple coloured pigments while the 100°C extraction yielded scarlet red coloured pigments. Experiments were carried out to investigate the best water:weight ratio and optimum temperature to obtain highest pigment concentration, best extraction method and best storing condition. Best water:weight ratio was 1:1, best temperature observed was 100°C, best extraction method was by using juice concentrate rather than water extraction and the best storing condition was storage in -20°C. Both extraction methods exhibited stable pH reading after one week of storage. Nevertheless, the best method to obtain high pigment concentration is by using juice concentrate which is at least two times more concentrated than samples extracted with water. © 2008 Asian Network for Scientific Information.

Item Type:	Article
Funders:	UNSPECIFIED
Uncontrolled Keywords:	Betacyanin; Betalain; Cactaceae; Dye; Food colouring; Natural colourant; Pulp; Hylocereus polyrhizus
Subjects:	Q Science > QH Natural history > QH301 Biology
Divisions:	Faculty of Science > Institute of Biological Sciences
Depositing User:	miss munirah saadom
Date Deposited:	16 Jul 2013 03:31
Last Modified:	21 Apr 2021 00:22
URI:	http://eprints.um.edu.my/id/eprint/7748

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