Experimentelle Untersuchungen zur Validität der „Probable Number“-Methode nach Ph. Eur. zur semiquantitativen Bestimmung galletoleranter, gramnegativer Keime
Originale
Key Words Amtliche Sammlung von Untersuchungsverfahren gem. § 64 LFGB | Galletolerante, gramnegative Bakterien | Probable-Number-Methode | Spiralplater
Summary
Bacterial Counts Using the “Probable Number” Method / Experimental study of the validity of the “Probable Number” method according to Ph. Eur. for the semiquantitative determination of bile-tolerant, gram-negative bacteria
Eighty-six experiments on dried preparations of herbal drugs grown in Germany (Nasturtium, Tropaeolum majus) were carried out to determine the count of so-called bile-tolerant, gram-negative bacteria (according to the definition of the Ph. Eur.). The Probable Number (PN) method according to Ph. Eur. was compared to a valid method from the official collection („Amtliche Sammlung von Untersuchungsverfahren zu § 64 LFGB – Lebens- und Futtermittelgesetzbuch, Methode L.05.00 5”).
Only 16.3 % of the results were comparable. The counts obtained with the PN-method very often (53.5 % of the experiments) exceeded the TAMC-counts (Total Aerobic Microbial Counts). Therefore, it is suggested that the pharmacopoeal method is not suitable for herbal drugs.
Korrespondenz:
Dr. Gero Beckmann, Institut Romeis Bad Kissingen GmbH, Schlimpfhofer Str. 21, 97723 Oberthulba, Germany; e-mail: g.beckmann@institut-romeis.de
Zusammenfassung
Es wurden 86 vergleichende Versuchsreihen an getrockneter Kapuzinerkresse unter besonderer Berücksichtigung sogenannter galletoleranter, gramnegativer Keime (GTGN) durchgeführt. Dabei wurde die semiquantitative