What Is Total Aerobic Mesophilic Count?
Total aerobic mesophilic bacteria count gives the total number of live bacteria that can grow in food in an oxygenated environment and at moderate temperatures. It does not look for a specific pathogen; It measures how much live microorganism load there is in the product. The result is reported as colony forming units (cfu/g or cfu/mL).
Purpose of Total Aerobic Mesophilic Count
The aim is to monitor raw material quality, production hygiene and the effectiveness of the cold chain. High TAMB alone does not mean that the product will cause disease; However, it is the earliest indicator that there is a problem in the hygiene chain and directly affects the shelf life.
Which Products Is Total Aerobic Mesophilic Count Applied To?
- Milk and dairy products
- Meat, poultry and seafood
- Ready meals and frozen foods
- Flour, spices and dry foods
- Beverages and drinking water
In Which Sectors Is Total Aerobic Mesophilic Count Used?
Standards Related to Total Aerobic Mesophilic Count
- ISO 4833-1 (cast plate method, 30 °C)
- ISO 4833-2 (smear plate method)
- ISO 7218 (general rules for microbiological examinations)
- ISO 6887 series (sample preparation and dilution)
Total Aerobic Mesophilic Count Conditions
- Method
- ISO 4833-1 cast plate or ISO 4833-2 spread plate
- Culture medium
- Plate Count Agar (PCA)
- Incubation
- under aerobic conditions at 30 °C
- Census
- Colony counting from plates in the countable range and calculation with dilution factor
Equipment for Total Aerobic Mesophilic Count
- Class II biosafety cabinet
- Temperature-controlled incubators
- Stomacher (peristaltic homogenizer) and sterile bags
- Autoclave and dry air sterilizer
- Colony counting apparatus and microscope
Sample Requirements for Total Aerobic Mesophilic Count
- The sample must be sent in its original, unopened packaging.
- Products that require a cold chain must be delivered with a cooler and without breaking the chain.
- Aseptic sampling rules must be followed; The container must be sterile.
- Batch, production date and expiration date information must be reported with the sample.
- The amount required for analysis varies depending on the product type; Confirmation must be received before shipping.
Duration of Total Aerobic Mesophilic Count
The incubation period is defined in the method standard and lasts several days. The total time, including sample preparation, dilution and reporting, is usually completed in less than a week.
Total Aerobic Mesophilic Count Procedure
- 1The sample is weighed under aseptic conditions and homogenized with dilution liquid.
- 2Decimal dilutions are prepared according to ISO 6887.
- 3Planting is done in petri dishes without each dilution and the medium is poured.
- 4Plates are incubated at defined temperature and time.
- 5Colonies are counted on plates within countable range.
- 6The result is calculated in cfu/g or cfu/mL with the dilution factor.
Total Aerobic Mesophilic Count Acceptance Criteria
The legislation, not the method, determines whether the result will be considered appropriate or not. The relevant communiqué of the Turkish Food Codex, EU 2073/2005 and 1881/2006 and the specification of the buyer company define different limits depending on the product group; The report gives the measured value and takes the limit from the applicable legislation.
Evaluation of Results
The result is compared with the microbiological criterion to which the product group is subject. Evaluation is usually based not on a single sample but on a set of samples taken from the same lot and a two-class/three-class plan.
Total Aerobic Mesophilic Count Report
- Sample description, batch/lot information and arrival conditions
- Sampling method (if taken by the laboratory)
- Applied analysis method and reference standard
- Analysis date and incubation conditions, if any
- Result and its unit
- Measurement uncertainty (if requested)
- A statement that the result applies only to the specimen submitted for testing
Accreditation
EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.
Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.
Scope and authorisationsRelated Regulations
- Turkish Food Codex Microbiological Criteria Regulation
- EU 2073/2005 — microbiological criteria for foodstuffs
- Law No. 5996 on Veterinary Services, Plant Health, Food and Feed
Food Testing — What Does This Testing Field Cover?
The section below describes the field that the Total Aerobic Mesophilic Count test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.
Food testing shows that a product is safe for consumption and contains what its label states. The family works along three axes: microbiological safety, chemical safety and nutritional composition. All three require different laboratory infrastructure, a different body of methods and a different turnaround time.
The most distinctive feature of the field is TIME PRESSURE. A steel specimen can wait on a shelf; a raw milk or fresh meat sample cannot. The time the sample was taken, the transport temperature and how long it takes to reach the laboratory directly determine the validity of the result. In food microbiology the cold chain record is therefore an inseparable part of the test report.
On the microbiological side there are two different questions and they must not be confused. DETECTION of a pathogen is a qualitative question: is Salmonella present in the sample or not? ENUMERATION of indicator organisms is a quantitative question and an indicator of production hygiene. The absence of a pathogen in a product does not show that hygiene is good; if the total mesophilic aerobic count is high, there is a problem in the process.
On the chemical side, pesticide residues, mycotoxins, heavy metals, additives, veterinary drug residues and process contaminants (acrylamide, furan, PAH) are measured. Multi-residue methods in this area (QuEChERS-based LC-MS/MS and GC-MS/MS) can screen hundreds of active substances in a single analysis; limits are defined separately for each product–substance pair.
On the composition side, protein, fat, moisture, ash, fibre, sugar profile, fatty acid composition, vitamin and mineral content are determined. These values are the basis of the nutrition declaration on the label and the tolerance ranges are defined in legislation — the difference between the declared value and the measured value must stay within that tolerance.
There is NO CE marking on food, and this shapes how the field works. Conformity is demonstrated through operating a HACCP-based food safety system, complying with labelling rules and not exceeding contaminant, residue and microbiological limits. A test result produces evidence not for a certificate but for a functioning system.
Allergen management carries particular weight. The presence of an undeclared allergen in a product is one of the most frequent causes of food recalls. Analysis here runs together with cleaning validation: it is shown that the line has been cleaned adequately after a production run containing an allergen and that the risk of cross-contamination is under control.
Voluntary schemes have become effectively mandatory in this field. Retail chains require their suppliers to hold a certificate under a GFSI-recognised scheme (BRCGS, IFS, FSSC 22000); without it, getting onto the shelf is practically impossible.
Method groups in this field
Pathogen detection
Detection of Salmonella, Listeria monocytogenes, Campylobacter, Cronobacter and Shiga toxin-producing E. coli; culture-based and molecular methods.
Indicator counts
Total mesophilic aerobic count, Enterobacteriaceae, coliforms and E. coli, coagulase-positive staphylococci, yeasts and moulds, lactic acid bacteria, sulphite-reducing Clostridia.
Pesticide and veterinary residues
Multi-residue screening by LC-MS/MS and GC-MS/MS with QuEChERS extraction.
Mycotoxins and contaminants
Aflatoxins, ochratoxin A, deoxynivalenol, patulin; heavy metals (ICP-MS), acrylamide and PAH compounds.
Nutritional composition
Kjeldahl protein, fat and fatty acid profile, moisture, ash, dietary fibre, sugar profile, vitamin and mineral analyses.
Allergens and authenticity
Gluten, milk, egg, nut and soy allergen analyses; molecular methods for species identification and adulteration detection.
Commonly confused in this field
- Sampling is half the result. A sample transported at the wrong temperature or delayed gives an invalid result even if it is analysed correctly in the laboratory.
- The absence of a pathogen does not show that hygiene is good; indicator counts give separate information and the two are read together.
- A result from a sample taken from a lot can be generalised to the whole lot only if the sampling plan was set up statistically.
- Limits are defined in separate regulations by product group and are updated regularly; a conformity decision based on an outdated limit table may be wrong.
- For exports, the limits of the destination country may differ from EU limits; the same product may be compliant in one market and non-compliant in another.
Which decisions these results support
- Verification of the HACCP plan and process monitoring
- The basis for the nutrition declaration and allergen information on the label
- Health certificates before export and compliance with destination market limits
- Supplier and lot-based acceptance control
- Shelf-life studies and determining storage conditions
- Producing evidence for audits under GFSI-recognised schemes
Related Tests
Frequently Asked Questions About Total Aerobic Mesophilic Count
Does a high TAMB mean the product is defective?
Not directly. TAMB is a hygiene indicator; A high value indicates impending spoilage or problems with production hygiene, but does not indicate the presence of pathogens. Separate analyzes are performed for the pathogen.
Is it also checked for fermented products?
Since fermented products contain live starter cultures, TAMB is naturally high and is not significant on its own. In these products, other parameters such as coliform, yeast and mold are preferred as hygiene indicators.