Development of a Yogurt-type Product from Saccharified Rice

บทคัดย่อ

A yogurt-type product from saccharified rice was developed. Jasmine rice was saccharified with amylolytic enzymes at 55 °C. Changes of reducing sugars, sugar components and compositions during hydrolysis were studied to obtain optimum condition and yield of glucose. Rice milk was prepared by fortification of saccharified rice with 3 % casein, 3% soybean oil and 0.4 % calcium lactate to improve both nutritive quality and organoleptic properties. Mixed cultures of Lactobacillus acidophilus and L. casei subsp. rhamnosus were used for lactic fermentation of rice milk. The effect of beta glycerophosphate, inoculum size and incubation period were investigated. Improvement for a more palatable yogurt was achieved by blending rice yogurt with pectin and strawberry preserve. Resulted rice-based yogurt with strawberry contained 3.05 % protein, 2.67 % fat, 24.4 % glucose, 1.5 % sucrose, 47 mg/100g of calcium, 0.86 % acidity as lactic, pH 3.48 and lactic bacteria count of 7.6 × 10⁷ CFU/g. Sensory evaluation revealed that rice-based yogurt with strawberry was well accepted by panelists when compared with commercial strawberry yogurt. Shelflife of rice-based yogurt stored at 4 °C was at least 20 days.