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Antimicrobial and Anti-biofilm Activities of Betacyanin Fractions from Red Pitahaya (Hylocereus polyrhizus) and Red Spinach (Amaranthus dubius)

posted on 2018-05-08, 03:33 authored by YI YI YONG
This thesis examines the ability of betacyanin, a natural red-violet pigment from red pitahaya (Hylocereus polyrhizus) and red spinach (Amaranthus dubius)in inhibiting the growth of bacteria that cause diseases and bacteria attached to surfaces such as glass, polystyrene, polyvinyl chloride, polyethylene, polypropylene, and silicone rubber. Extraction was optimized to produce a betacyanin fraction and various assays were carried out to identify the best betacyanin formulation against a polymicrobial biofilm.


Campus location


Principal supervisor

Choo Wee Sim

Additional supervisor 1

Lee Sui Mae

Additional supervisor 2

Gary Dykes

Year of Award


Department, School or Centre

School of Sciences (Monash University Malaysia)


Doctor of Philosophy

Degree Type



Faculty of Science

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