Total Aerobic Microbial Count (TAMC)
Total Aerobic Microbial Count (TAMC) is a key microbiological quality control test used to determine the total number of viable aerobic microorganisms present in a sample. It provides a general assessment of microbial burden in pharmaceutical, nutraceutical, and raw material products.
TAMC is an important indicator of overall manufacturing hygiene, environmental control, and raw material quality. Elevated counts may suggest inadequate process controls, contamination during production, or insufficient preservation systems.
USP <61>Microbial Examination of Non-Sterile Pharmaceutical Products— TAMC
TAMC is performed using a Plate Count/Membrane filtration and MPN quantitative enumeration method designed to determine viable aerobic microbial populations in pharmaceutical drug products.
- Sample preparation and homogenization to ensure uniform distribution
- Serial dilution of sample where required
- Inoculation onto non-selective nutrient agar or suitable general-purpose media
- Incubation under aerobic conditions at defined temperatures
- Growth of viable aerobic bacteria into visible colonies
- Enumeration of colony-forming units (CFU) to determine total microbial load
- Application of Method suitability testing to ensure accurate recovery with neutralizing agents (if required)
This method provides a quantitative measurement of aerobic microbial contamination and is widely used for routine quality control and regulatory compliance.
USP <2021> Microbial Examination of dietary supplements - TAMC
TAMC testing follows a broader microbial examination approach with enhanced focus on recovery of stressed organisms from complex product matrices especially in herbal and natural health products.
- Sample preparation with consideration for neutralization of antimicrobial preservatives
- Use of suitable diluents to preserve microbial viability
- Inoculation onto quality controlled media supporting recovery of injured or stressed organisms
- Controlled incubation under aerobic conditions
- Enumeration of all viable aerobic microbial colonies
- Application of preparatory testing to ensure accurate recovery with neutralizing agents (if required)
This method ensures higher reliability in complex formulations such as herbal, protein-based, and chemically active products.
Why It Matters
- Provides a baseline measurement of microbial contamination
- Ensures compliance with USP microbial limits (USP <61>, USP <2021>)
- Supports batch release and product quality decisions
- Detects contamination from raw materials, water systems, or manufacturing processes
- Helps maintain strong GMP and contamination control programs
How to Connect
Contact Unicorn Analytical Services for accurate TAMC testing and reliable microbial load analysis.
Our team provides USP-compliant testing tailored to your product type and regulatory requirements.