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S2Media™ MacConkey (MAC) Agar

S2Media™ MacConkey (MAC) Agar

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S2Media™ prepared MacConkey (MAC) Agar is a selective and differential medium intended for the detection and isolation of Gram-negative enteric bacilli. Escherichia coli can ferment lactose to produce acid, which decreases pH. This is indicated by neutral red resulting in pink colonies. Increased acid production results in the precipitation of bile salts, or a halo, around lactose fermenting bacteria. Non-lactose fermenting bacteria such as Salmonella spp. grow but remain colorless without a bile precipitate.


Also known as:

  • Bile Salt Agar with Lactose and Neutral Red

  • MacConkey's Agar


👉 Finished product meets the following standards and references:

  • AOAC,

  • BAM,

  • CLSI,

  • EP,

  • ISO,

  • JP,

  • SMD,

  • SM-WW,

  • USDA,

  • USP,

  • USP-NF


🧫 Application Areas:

  • Clinical microbiology for the isolation and differentiation of Gram-negative enteric bacteria

  • Food safety and quality testing

  • Pharmaceutical and compounding microbiology

  • Water, wastewater, and environmental microbiology

  • Veterinary diagnostic microbiology

  • Cosmetics and personal care microbiology

  • Cannabis quality and microbial safety testing

  • Molecular microbiology workflows requiring bacterial isolation prior to downstream characterization


Equivalent or comparable item numbers:

  • G35,

  • G35BX,

  • GA35,

  • R01550,

  • EB-P1205,

  • P1205,

  • 22-349-974,

  • 215197,

  • S21807ND,

  • 821682,

  • 50-238-8029,

  • M0149

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