Tea yoghurt processing method
First, raw materials
1. Milk. Requires fresh, high quality, no antibiotics or preservatives.
2. White sugar. Color white, loose and dry, without any odor.
3. Tea. Depending on the eating habits of local residents, fresh green tea with good quality is generally used.
Second, the process
Tea → rinse → tea → filter tea juice
Raw milk → filtration → sugaring → mixing and stirring → sterilization (85°C, 30 minutes) → cooling to 40°C
Yogurt bottles → soaking → brushing → disinfection
Adding starter → Bottling → Fermentation (38-42°C, 3 hours) → Refrigerating (4~5°C) → Testing a finished product
Third, the operating point
1. Production of milk culture medium. A fresh, high-quality, non-antibiotic-containing skim milk was used to sterilize in an intermittent water bath at 63°C for 30 minutes.
2. Selection and ratio of strains. Streptococcus thermophilus and Lactobacillus bulgaricus are inoculated in a milk medium in a ratio of 1-2:1-2, or in a 6:3:1 ratio of Streptococcus thermophilus, Lactobacillus bulgaricus, and Streptococcus lactis. Culture medium.
3. Inoculation amount and culture time, temperature. The temperature of the culture medium was lowered to 40°C and inoculation was started. When the viability of the strain was 0.4, the inoculation amount was 2% to 3% of the culture medium and cultured at 38 to 40°C for about 3 hours. When the starter coagulates, it is immediately taken out and placed in a refrigerator at 2~6°C for cooling.
4. Tea pretreatment. Tea is loosely packed in a single layer of gauze, rinsed with cold water to remove dust. The amount of tea is determined according to the local people's drinking habits, which accounts for about 1% to 2% of the amount of milk. The tea water accounts for about 3% of milk. The tea water is filtered with 4 to 6 layers of gauze to remove the tea foam.
5. Cool. The milk culture medium inoculated with the strain is mixed with tea and cooled. The temperature of the cooling should be determined by the season, the temperature, and the temperature of the sterilized milk bottle. The cooling temperature is generally 40°C in summer and 45°C in winter.
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