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Laboratory of Dairy Technology
and Laboratory of Organic Chemistry, University of Thessaloniki, Thessaloniki, Greece
ABSTRACT
Certain antibiotics present in milk interfere with the phosphatase test. Penicillin and oxytetracycline form a blue color with the Folin-Ciocalteu reagent, giving a false test. Streptomycin and neomycin inhibit, under certain conditions, the formation of blue color up to 50%; non-pasteurized milk cannot be taken for pasteurized.
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