Linnaeus Food Testing
Food

“Quality is never an accident. It is always the result of intelligent effort.”

- John Ruskin

FRESH PRODUCE, NUTS
& DRIED PRODUCTS

Linnaeus provide a range of tests for fresh produce, nuts and dried products including E. coli, Staphylococcus aureus, Listeria and Salmonella.
ENQUIRE ABOUT TESTING

STANDARD TESTS
AEROBIC PLATE COUNT

Total aerobic and heterotrophic plate count are terms often used interchangeably to describe a test that looks for a total number of bacteria present in a food product.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 8.72 (Pour Plate) and 8.82 (Petrifilm).

The results are available in 48 hours and can be either done by pour plate or petrifilm. They are both reported as cfu/g.

E. COLI

The Ministry of Health ‘Drinking Water Standards for New Zealand 2005 (Revised 2008) stipulates that all potable water should have NO E. coli which is shown in test results as <1 MPN/100mL. E. coli can be found in water that has been polluted with faecal matter, indicating the likelihood of pathogenic bacteria.

FAECAL COLIFORMS (MPN)

Faecal coliforms (MPN) are a sub group within Total Coliforms and are present in the gut and faeces of warm-blooded animals. If present in food they can cause severe stomach cramps and diarrhoea.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 9.81 & 9.91. 

The results are available in 72 hours using a 3-replicate, 3 dilution multiple tube procedure.  This is reported as MPN/g (Most Probable Number).

LISTERIA MONOCYTOGENES

Listeria monocytogenes is a foodborne bacteria. In healthy adults and children listeria usually causes few or no symptoms, but some people are more at risk of severe disease. People who are more at risk include pregnant women, newborn babies, people with weakened immune systems and the elderly.

Performed by molecular isolation using a DNA probe-based assay. Results are generally available in 24-48 hours. They are reported as Detected/Not Detected.

Method: Listeria monocytogenes (detection) by BIOTECON foodproof® (real-time PCR).

SALMONELLA

Salmonella is the second most common bacterial cause of foodborne illness in New Zealand. There are many different kinds of salmonella with different sources and severity of illness. Salmonella live in the gut of many farm animals and can contaminate meat, eggs, poultry and milk. Other foods like green vegetables, fruit and shellfish can become contaminated through contact with wildlife or untreated human and animal waste. Some strains can make people sick causing severe stomach cramps, diarrhoea and fever.

This test is performed by FDA BAM April 2003 (modified) and APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 36.5. Negative results are available in 96 hours using RVS and TT broth followed by streaking on XLD, HE and BS agars. Positive results are available in 7 days using confirmation tests of Microbact 12A and Oxoid Salmonella Test Kit.

STAPHYLOCOCCUS AUREUS

Staphylococcus aureus growth in food products presents a potential public health hazard as many strains of Staphylococcus aureus produce enterotoxins that cause food poisoning if ingested.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 39.63.

Negative results are available in 48 hours using growth on Baird Parker media. Positive results are available in 72 hours using a confirmation test based on coagulase.

TOTAL COLIFORMS

Total Coliform counts give an indication of the contamination potential of water.

TUTIN

Linnaeus are agents for testing honey for Tutin under a standard produced by the Ministry of Primary Industries.

YEAST & MOULDS

Comprise a large and diverse group of microorganisms consisting of several thousand species. Both yeasts and moulds cause various degrees of deterioration and decomposition of foods. They can invade and grow on virtually any type of food at any time.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 21.2 (Petrifilm) & 21.51 (DRBC).

The results are available in 5 days using petrifilm. They are reported as cfu/g.

STANDARD TESTS
AEROBIC PLATE COUNT

Total aerobic and heterotrophic plate count are terms often used interchangeably to describe a test that looks for a total number of bacteria present in a food product.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 8.72 (Pour Plate) and 8.82 (Petrifilm).

The results are available in 48 hours and can be either done by pour plate or petrifilm. They are both reported as cfu/g.

E. COLI

The Ministry of Health ‘Drinking Water Standards for New Zealand 2005 (Revised 2008) stipulates that all potable water should have NO E. coli which is shown in test results as <1 MPN/100mL. E. coli can be found in water that has been polluted with faecal matter, indicating the likelihood of pathogenic bacteria.

FAECAL COLIFORMS (MPN)

Faecal coliforms (MPN) are a sub group within Total Coliforms and are present in the gut and faeces of warm-blooded animals. If present in food they can cause severe stomach cramps and diarrhoea.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 9.81 & 9.91. 

The results are available in 72 hours using a 3-replicate, 3 dilution multiple tube procedure.  This is reported as MPN/g (Most Probable Number).

LISTERIA MONOCYTOGENES

Listeria monocytogenes is a foodborne bacteria. In healthy adults and children listeria usually causes few or no symptoms, but some people are more at risk of severe disease. People who are more at risk include pregnant women, newborn babies, people with weakened immune systems and the elderly.

Performed by molecular isolation using a DNA probe-based assay. Results are generally available in 24-48 hours. They are reported as Detected/Not Detected.

Method: Listeria monocytogenes (detection) by BIOTECON foodproof® (real-time PCR).

SALMONELLA

Salmonella is the second most common bacterial cause of foodborne illness in New Zealand. There are many different kinds of salmonella with different sources and severity of illness. Salmonella live in the gut of many farm animals and can contaminate meat, eggs, poultry and milk. Other foods like green vegetables, fruit and shellfish can become contaminated through contact with wildlife or untreated human and animal waste. Some strains can make people sick causing severe stomach cramps, diarrhoea and fever.

This test is performed by FDA BAM April 2003 (modified) and APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 36.5. Negative results are available in 96 hours using RVS and TT broth followed by streaking on XLD, HE and BS agars. Positive results are available in 7 days using confirmation tests of Microbact 12A and Oxoid Salmonella Test Kit.

STAPHYLOCOCCUS AUREUS

Staphylococcus aureus growth in food products presents a potential public health hazard as many strains of Staphylococcus aureus produce enterotoxins that cause food poisoning if ingested.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 39.63.

Negative results are available in 48 hours using growth on Baird Parker media. Positive results are available in 72 hours using a confirmation test based on coagulase.

TOTAL COLIFORMS

Total Coliform counts give an indication of the contamination potential of water.

TUTIN

Linnaeus are agents for testing honey for Tutin under a standard produced by the Ministry of Primary Industries.

YEAST & MOULDS

Comprise a large and diverse group of microorganisms consisting of several thousand species. Both yeasts and moulds cause various degrees of deterioration and decomposition of foods. They can invade and grow on virtually any type of food at any time.

This test is performed by APHA Compendium of Methods for the Microbiological Examination of Foods 5th Edition 21.2 (Petrifilm) & 21.51 (DRBC).

The results are available in 5 days using petrifilm. They are reported as cfu/g.