Abstract
Probiotic fermented milk by Lactobacillus casei subsp. casei R-68 with skim milk and red dragon fruit extract as a raw material was expected to produce probiotic fermented milk with more completed nutriotional value and health benefits. The purpose of this study was to determine the best percentage of red dragon fruit extract on the quality of fermented milk. This study used a Completely Randomized Design Experiment with four treatmentsnamely BN1 = 2% red dragon fruit extract, BN2 = 4% red dragon fruit extract, BN3 = 6% red dragon fruit extract, BN4 = 8% red dragon fruit extract and three replications. Data were analyzed using ANOVA, followed by DNMRT at 5% level. The results show that the concentration of red dragon fruit extract significantly (P 0.05) protein, solid total, the sensory test by descriptive and hedonic of flavour and the sensory test by descriptive of viscosity. It was concluded that the best quality of fermented milk was BN4 treatment (red dragon fruit extract 8%), which meet the quality of fermented milk with a pH of 5.32, total lactic acid 0.92%, total lactic acid bacteria 12.49 log CFU/ml, protein 5.10%, solid total 85.69%, and assessed that panelists preferred the quality attributes of color, taste, flavour and viscosity.
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