The objective of this study was investigate the optimal formulation of Homemade dairy yogurt that 100 percent of dairy milk ratio of dairy milk to skim milk powder and milk powder was 90:10 85:15 and 80:20 respectively as compared to the control (commercial-yogurt Dutch mill). The Yogurt mixeds were heated to 85 C and held for 5 min incubated at 43 C until the pH reached 4.3. The mixes were then stored at 4 C. Yogurt were prepared from higher ratio of dairy milk : skim milk powder and milk powder led to the more time of incubation. The 31 participated sensory evaluation of the sample. From the result choosed first three formulas to analysed in chemical characteristic and bacterial chariacteristic. Total solid of yogurt were prepare from 90:10 and 85:15 of dairy milk : milk powder ratio were not different with control (p>0.05). Total cell count was found to range between 8.08 – 8.50 LogCFU/g and Lactic acid bacteria was found to range between 6.71 – 8.88 LogCFU/g. The optimum formula of homemade dairy yogurt that ratio of dairy milk to milk powder was 90 : 10 and cost per unit (140 g.) was 10.51 Baht compare with control was 14 Baht.

The objective of this research was to develop ready- to- drink yogurt products from mixed fruits and vegetables. By starting with studying the stability level of basic yogurt formula In gelatin is added in 3 levels of basic yogurt products to be used as ingredients in fixed basic yogurts 2 4 and 6 percent with other components in the formula: Pasteurized milk natural flavored yogurt granulated sugar and gelatine Studies have shown that using basic formula yogurt with 4 percent stability is the right amount for making basic stable yogurt. Which the yogurt has 21 solids soluble in water white light yellow The texture of the yogurt is stable. After that mix yoghurt and fruit and vegetable juice to produce curdled milk. By studying the ratio of basic formula yogurt and fruit and vegetable juices in 3 different ratios namely 30:70 50:50 and 70: 30 percent. The quality test results showed that 50: 50 percent formulas had the pH 4. 37 the amount of solids that Soluble in 15 ◦Brix water and are the most accepted formulas. Analyzing the chemical composition thisreducedsugar drinking yoghurt from fruits and vegetables had moisture ash fat protein fiber protein and carbohydrate was found to be 86.81 ± 2.83 0.40 ± 0.32 0.37 ± 0.23 3.02 ± 0.77 0.14 ± 0. 26 and 9. 25 ± 0. 41. Stored at 4 ± 1 ° C for 15 days found that total microbial count yeast mold And coliforms do not exceed the standards set (Notification of the Ministry of Public Health 353/2013)

The study aimed to investigate appropriate formula for drinking yoghurt production. The conditions were ratio of yoghurt : concentrated rambutan juice at 100 : 0 90 : 10 85: 20 and 75: 25 the effect of concentrated rambutan juice on physical and chemical and microbiological lactic acid bacteria survival appropriate proportion of syrup and lactic acid bacteria survival during storage of drinking yoghurt from rambutan juice. It was found that proportion of concentrated rambutan juice had no effect in color (L* a*) of the yoghurt (p>0.05) but its impact to b* and viscosity were significant (p≤0.05) they increased with the increased proportion of the concentrated rambutan juice. Yoghurt with 15% concentrated rambutan juice had 88% survival rate of lactic acid bacteria after stimulated digestive system. The results showed that optimal production formula of drinking yoghurt from concentrated rambutan juice and syrup were 90:10 Z(yoghurt: concentrated rambutan juice; 85:15) : syrup) Drinking yoghurt stored in the refrigerator at 4±1oC for 15 day was evaluated and found that LAB survival numbers were 9.90 log CFU/mL.