Some bacteria are able to survive pasteurisation, causing milk spoilage. Streptococcus lactis, Lactobacil1s casei and L. cremoris, produce acids, causing the protein to turn into curd.
These bacteria which are able to endure the heat of pasteurisation are called thermoduric. Pasteurisation has no effect on thermophilic bacteria which grow well at 60°C to 70°C.
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