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EPTIS factsheet 153431 | Last revision 2021-10-29 | URL: https://www.eptis.bam.de/pts153431 https://www.eptis.bam.de/pts153431

PT provider
PT provider DRRR - Deutsches Referenzbüro für Ringversuche und Referenzmaterialien GmbH DRRR - Deutsches Referenzbüro für Ringversuche und Referenzmaterialien GmbH
Based in Germany
Language(s) German/English
Remarks Lactose-splitting, gram-negative, facultative anaerobic and rod-shaped bacteria that also produce acids and gases are considered as Coliforms or faecal Coliforms. Coliforms are indicator microorganisms for water-quality and are also used as hygiene indicator for the production of foodstuffs. Lactobacilli belong to a group of healthy bacteria (probiotics) that produce the metabolic end product lactic acid and these bacteria commonly occur in nature but also in the human gastrointestinal tract. Lactobacilli are used for the production of milk products and curing of vegetables, fish, meat or other sausage products. Shigella belong to the family Enterobacteriaceae and initiate Shigellosis (fever, diarrhoea) after colonising of the intestine by secretion of enterotoxins. The pathogens are mainly distributed by polluted water or contaminated foodstuffs. Enterococcus belong to the most thermo-tolerant bacteria beside the spore-forming bacteria and are able to contaminate pasteurised milk products or cooked meat. Some representatives are putrefactive agents and serve as hygienic parameters for production of foodstuffs. Clostridia commonly occur in soil and the environment but these bacteria are also able to colonise the intestine of humans and animals. They grow under anaerobic conditions and produce heat-stable resistant spores. Some species produce endotoxins causing diseases like e.g. tetanus and other species are classical foodstuff spoiling germs. B.cereus is a pathogenic (risk group 2) rod shaped bacterium naturally living in soil and herbal products. Because of the ability to form resistant spores B.cereus can be found in a lot of different foodstuffs and matrices like meat, milk and also cheese. This proficiency testing scheme is designed because the produced toxins can possibly cause food poisoning.
Product groups Food and drink
Testing fields Analytical chemistry
Technical details
Test item Tested property Testing method
Whey powder pH value -
Titratable Acidity -
Lactose -
Ash -
Fat -
Dry matter -
Protein -
Casein/Caseinate pH value -
Lactose -
Ash -
Fat -
Protein -
Water content -
Milk powder Total lactic acid -
Titratable acidity -
Nitrate -
Lactose -
Ash -
Fat -
Dry matter -
Protein -
Free fat -
Nitrate/Nitrite -
Vitamin D -
Vitamin A -
Vitamin C -
Bulk density -
Milk powder frozen Lactobacillus -
Listeria -
Staphylococcus -
Bacillus cereus -
Shigella -
Clostridia -
Salmonella spp. -
Enterococcus -
E.coli -
Moulds -
Enterobacteriaceae -
Yeats -
Coliforme bact. -
Cronobacter spp. -
Thermophilic bacteria -
Staphylococcus -
B.cereus -
Anaerobic, thermophilic spores -
Pseudomonas -
Clostridia -
Aims of the PT scheme
Target group of participants all laboratories
Linked to specific legislation / standards
Additional, subsidiary aims validation of testing methods
Number of participants
Accredited or otherwise reviewed by a 3rd party

Accredited by A2LA (USA) and DAkkS (Germany) on the basis of ISO/IEC 17043 for part of the parameters

Operation is commissioned / requested by
Fees and frequency
Participation fee 136-340 Euro, depending on sample and parameters
Regularly operated Yes (several times p.a., dep. on sample and parameters)
Year of first operation 2007, 2016, 2017
Contact details of the PT provider
Provider Contact person
DRRR - Deutsches Referenzbüro für Ringversuche und Referenzmaterialien GmbH
Reinhartser Straße 31
87437 Kempten

Phone: +49 (0) 831/960 8780
Fax: +49 (0) 831/960 87899
Web: http://www.drrr.de http://www.drrr.de
Dr. Ulrich Leist
Phone: +49 (0) 831/960 87878
Fax: +49 (0) 831/960 87899
Email: info@drrr.de info@drrr.de
If you find any mistakes please contact the responsible EPTIS coordinator in Germany, Mr Johannes van de Kreeke. Mr Johannes van de Kreeke.
Any questions or problems? Please contact us at eptis@bam.de.
Application version: 1.23-SNAPSHOT.20230502124635-7925ae379a631fc1ececff45d2921c8db38877d5