Antibacterial Activity of Synbiotic Yoghurt Peel Extract of Red Dragon Fruit (Hylocereus polyrhizus) Evaporation with Honey

Dimas Wahyu Pradana *

Faculty of Animal Science, Universitas Brawijaya, Indonesia.

Abdul Manab

Faculty of Animal Science, Universitas Brawijaya, Indonesia.

Manik Eirry Sawitri

Faculty of Animal Science, Universitas Brawijaya, Indonesia.

*Author to whom correspondence should be addressed.


Synbiotic yogurt contains both probiotics and prebiotics. The peel of red dragon fruit contains 10.79% pectin, which can be used as a prebiotic. Red dragon fruit peel synbiotic yoghurt has an unpleasant aftertaste. Honey can enhance the functional properties of dragon fruit peel synbiotic yogurt. Yogurt with the addition of prebiotics can increased the functional properties of probiotic yogurt and increase the viability of bacteria the digestive tract. The purpose of this study was to determine the antibacterial activity of synbiotic yogurt with evaporated red dragon fruit peel extract and honey. This research was conducted at the Laboratory of Animal Products Technology, Faculty of Animal Husbandry, Universitas Brawijaya. The research material is 3-month-old male 15 white rats (Rattus norvegicus) weighing between 150-180 g and divided into 3 groups, probiotic yoghurt, synbiotic yoghurt with addition of red dragon fruit peel extract (Hylocereus polyrhizus) 20% made from 10% skim milk and yoghurt starter containing Lactobacillus bulgaricus and Streptococcus thermophilus (1:1), and the addition of 2% honey to synbiotic. Animals were given probiotic yogurt (P0), 20% red dragon fruit peel extract synbiotic yogurt (P1), and 20% red dragon fruit peel extract synbiotic yogurt with 2% honey sweetener (P2). The duration of experimenting is 30 days. Afterward, white rats will be dissected and the faeces in the ileum will be taken for testing. The data obtained were analyzed using descriptive qualitative. The results showed that P0 did decrease coliform and Enterococcus spp but increase total bacteria, mold and yeast, and Escherichia coli. The addition of evaporated red dragon fruit peel extract in synbiotic yogurt (P1) did decrease total bacteria, coliform, and Enterococcus spp but increase in mold and yeast and Escherichia coli. The addition of honey (P2) did decrease total decrease, mold and yeast, and Enterococcus spp but increase Escherichia coli. The addition of honey to the synbiotic yogurt of red dragon fruit peel extract can affect the total number of bacteria, mold and yeast, coliform, Escherichia coli, and Enterococcus spp.

Keywords: Symbiotic yoghurt, red dragon fruit peel, honey, antibacterial activity, Escherichia coli, Enterococus spp

How to Cite

Pradana, D. W., Manab , A., & Sawitri , M. E. (2023). Antibacterial Activity of Synbiotic Yoghurt Peel Extract of Red Dragon Fruit (Hylocereus polyrhizus) Evaporation with Honey. Asian Food Science Journal, 22(2), 1–8.


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