Safety is probably the main reason to buy starter cultures from a commercial supplier rather than propagating local stocks of cultures. The commercial suppliers have the scientific and technical competencies necessary to allow them to maintain purity with respect to cross-contamination as well as protection against harmful contaminants. The preservation of the cultures in lyophilized or frozen form allows the time required to perform extensive quality control, including analyses for activity, identity, and purity. Also, the regulatory competencies are important to assure compliance with the relevant national and international legislation and standards, not only for the culture manufacturer but also for the consumers
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