Method for the detection of antimicrobial residues in food and bodily fluid samples
The present invention relates to a novel method for the rapid detection of the presence or absence of antimicrobial residues in products preferably food products.
1. A process for determining the presence or absence of an antimicrobial residue in a sample, which process comprises:
(i) contacting the sample with a test suitable for determining the presence or absence of an antimicrobial residue in the sample;
(ii) inactivating any natural disturbing compound present in the sample which is capable of inhibiting the test and which leads to a false positive result absent said inactivating step, by heating said contacted sample and test to a temperature of 75° C. to 85° C. for a sufficient time interval to inactivate the natural disturbing compound that may be present in the sample; followed by
(iii) incubating the contacted sample and test to determine whether microbial growth occurs, whereby the absence of microbial growth indicates the presence of at least one antimicrobial residue.
2. A process according to claim 1 , which further includes contacting said sample with a thickening agent.
3. A process according to claim 2 , wherein the thickening agent is a polysaccharide or a protein.
4. A process according to claim 3 , wherein the thickening agent is methyl cellulose or bovine albumin.
5. A process according to claim 1 , wherein the sample is a foodstuff, an animal body fluid, an animal tissue or an extract thereof.
6. A process according to claim 5 , wherein the body fluid is blood, urine, pre-urine, milk, or meat juice.
7. A process according to claim 5 , wherein the animal tissue or an extract thereof is muscle, heart, liver or kidney or an extract thereof.
8. A process according to claim 2 , wherein the sample is a foodstuff, an animal body fluid, an animal tissue or an extract thereof.
9. A process for determining the presence or absence of an antimicrobial residue in a sample, which process comprises:
(i) contacting the sample with a test suitable for determining the presence or absence of an antimicrobial residue in the sample;
(ii) inactivating any natural disturbing compound present in the sample which is capable of inhibiting the test and which leads to a false positive result absent said inactivating step, by heating said contacted sample and test for 10 to 15 minutes to inactivate the natural disturbing compound that may be present in the sample; followed by
(iii) incubating said contacted sample and test to determine whether microbial growth occurs, whereby the absence of microbial growth indicates the presence of at least one antimicrobial residue.
10. A process according to claim 9 , which further includes contacting said sample with a thickening agent.
11. A process according to claim 10 , wherein the thickening agent is a polysaccharide or a protein.
12. A process according to claim 11 , wherein the thickening agent is methyl cellulose or bovine albumin.
13. A process according to claim 9 , wherein the sample is a foodstuff, an animal body fluid, an animal tissue or an extract thereof.
14. A process according to claim 13 , wherein the body fluid is blood, urine, pre-urine, milk, or meat juice.
15. A process according to claim 13 , wherein the animal tissue or an extract thereof is muscle, heart, liver or kidney or an extract thereof.
16. A process according to claim 10 , wherein the sample is a foodstuff, an animal body fluid, an animal tissue or an extract thereof.