Red dragon fruit peel can be processed into yogurt. Yogurt is a coagulated milk product
obtained from the lactic acid fermentation-yogurt made from various milk, whether fresh
milk, skim milk, or even full cream milk. The additions of red dragon fruit peel may
enhance the taste and the therapeutical values. This study was aimed to compare the
organoleptic properties, protein, lipid, and flavonoid content of commercial starter and
isolated culture red dragon fruit peel yogurt. Red dragon fruit peel yogurt was made with
amounts of red dragon fruit peel (25% w/v), full cream milk, sucrose and, commercial
starter (Lactobacillus bulgaricus, Lactobacillus acidophilus, Streptococcus thermophilus,
Bifidobacterium) or isolated culture (L. bulgaricus and S. thermophilus). Hedonic scale
test form was used for measuring organoleptic properties. Protein content was used
Kjeldahl method, lipid content was used Soxhlet method, and flavonoid content was used
chromatography. This research showed that protein and lipid contents in red dragon fruit
peel yogurt with commercial starter were higher than red dragon fruit peel yogurt with
isolated culture. Flavonoid content in the isolated culture yogurt was higher than
commercial starter yogurt. Organoleptic properties between groups were significantly
different (p<0.05). Red dragon fruit peel yogurt used isolated culture has a good chance of
getting a positive reception from the public and has potential as a functional food.