Antibiotic Assay Medium 1 (Seed Agar) is a standardized microbiological culture medium used for the potency testing of a broad range of antibiotics through plate assay techniques. Each 500mL bottle contains a nutrient rich agar base composed of peptone, pancreatic digest of casein, yeast extract, and beef extract, adjusted to a pH of 6.6 ± 0.2. The formulation supports uniform growth of assay organisms such as Micrococcus luteus and Staphylococcus aureus, which are commonly used in antibiotic sensitivity testing. This medium functions as the seed or surface inoculation layer in cylinder plate or disk diffusion assays, allowing antibiotics to diffuse evenly through the agar and produce measurable inhibition zones. It is widely used in pharmaceutical manufacturing, quality control laboratories, and regulatory testing environments.