2. Prepare a glass bottle and a stirring rod. Wash them with boiling water and disinfect them.
3. Soak fresh milk in hot water for a while until the milk is warm, about 30-40 degrees, because this temperature is very suitable for the reproduction of lactic acid bacteria.
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4. Pour the warm milk into the sterilized glass bottle, put 150G yogurt into it, and stir well.
5. Then cover it with safety film.
6. Put it in the oven, the temperature is about 30-40 degrees. Too high or too low is not suitable for the growth of lactic acid bacteria.
7. Take it out after six hours.
Plus: tips for making yogurt.
The required constant-temperature fermentation instruments can also be replaced by smoldering pots, rice cookers, thermos bottles, ovens, microwave ovens with barbecue function, bowl dryers, disinfection cupboards, plug-in heat preservation devices, etc. In short, it is necessary to have the experimental spirit, and test the temperature change and fermentation time for the first time, and the fermentation time will be lengthened with the decrease of temperature.
1. It is better to sterilize all the instruments used in production with boiling water first.
2. The most suitable temperature for lactic acid bacteria fermentation is 43-45℃. If the temperature is too high, the bacteria will be killed, and if it is too low, the fermentation time will be prolonged and the flavor will be affected.
3. When making by inoculation, you must choose the product with the closest production date, because this newly produced yogurt has a large number of live bacteria, high activity and relatively stable quality, so you must choose the original flavor, and all other flavors are added with food essence and pigment, which will affect the quality of yogurt.
4. Please choose general low-fat, full-fat pure fresh milk or pure milk powder, and do not choose milk fortified with special nutrition or seasoning.
5. The fermentation time is 8 hours, and the error is 2 hours. The reason is that the heat preservation effect of the heat preservation apparatus is unreasonable.