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Alkali Scientific Antibiotic Assay Medium 9, 500mL Bottle, 1/Pk
Supplier: Alkali Scientific AAMB09
Antibiotic Assay Medium 9 (Polymyxin Base Agar) is a specialized culture medium formulated for the microbiological assay of polymyxin B, colistimethate, and carbenicillin. Each 500 mL bottle contains a nutrient agar base with pancreatic digest of casein, soy peptone, and glucose, adjusted to pH 7.2 ± 0.2. The medium functions as the base layer in plate assay methods, providing a firm and nutrient rich surface that allows controlled diffusion of antibiotics for accurate potency determination. Designed to align with USP and FDA testing protocols, it is commonly used with a seed layer such as Medium 10 to support the growth of test organisms including Bordetella bronchiseptica. The balanced formulation promotes consistent organism recovery and clear zones of inhibition, enabling reliable measurement of antibiotic strength in pharmaceutical quality control laboratories.
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