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[Characteristics of determining the microbial contamination of penicillin series antibiotic powders and tablets]
Abstract:
Optimal conditions for determination of microbial contamination of drugs were studied on artificially contaminated powders and tablets of phenoxymethylpenicillin, ampicillin, oxacillin and dicloxacillin. The method of membrane filtration was the best for determination of the microbial contamination of the powders. However, it was not possible to wash out completely the antibiotic from the membrane filter. To prevent this it was necessary to add penicillinase into the nutrient medium onto which the filter was put for providing the microbial growth. For determination of microbial contamination of tablets direct plating of 3 per cent suspension of the tablet mass onto the surface of the nutrient medium with penicillinase was the best.
Insights
Determining microbial contamination in penicillin drugs requires specific methods. Membrane filtration with penicillinase is best for powders, while direct plating suits tablets.
Area of Science:
- Pharmaceutical Microbiology
- Drug Quality Control
Background:
- Microbial contamination poses a significant risk to drug safety and efficacy.
- Accurate methods are crucial for detecting contamination in pharmaceutical products like penicillin-based drugs.
Purpose of the Study:
- To establish optimal conditions for determining microbial contamination in phenoxymethylpenicillin, ampicillin, oxacillin, and dicloxacillin.
- To compare methods for analyzing powders and tablets.
Main Methods:
- Investigated membrane filtration for powder samples.
- Evaluated direct plating for tablet samples.
- Utilized nutrient media with penicillinase to counteract antibiotic interference.
Main Results:
- Membrane filtration proved effective for powders, but required penicillinase in the medium to overcome antibiotic inhibition.
- Direct plating of a 3% tablet mass suspension on penicillinase-containing medium was optimal for tablets.
Conclusions:
- Specific methods are necessary for accurate microbial contamination assessment in different pharmaceutical forms.
- Penicillinase is essential in culture media when testing penicillin-containing drugs to ensure reliable microbial growth detection.