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December 2002


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Frank vanderzanden <[log in to unmask]>
Reply To:
The Pharmaceutical Microbiology Mail List <[log in to unmask]>
Fri, 6 Dec 2002 08:36:39 -0600
text/plain (46 lines)
[i] The antimicrobial activity of the preparation in its final container is
investigated over the period of validity to ensure that such activity has
not been impaired by storage. Such investigations may be carried out on
samples removed from the final container immediately prior to testing.
During development of a pharmaceutical preparation, it shall be
demonstrated that the antimicrobial activity of the preparation as such or,
if necessary, with the addition of a suitable preservative or preservatives
provides adequate protection from adverse effects that may arise from
microbial contamination or proliferation during storage and use of the
The efficacy of the antimicrobial activity may be demonstrated by the test
described below. The test is not intended to be used for routine control
purposes. [/i]

The text above is from the PhEur (5.1.3). The last alinea is important for
you. It says that the described method may demonstrate the efficacy. Why
botter to take other timepoints of sampling. Let's say 24 hour, 2 days and
seven days. The spec's good be like a 3 log reduction for bacteria after 2
days and no increase after 7 days!
I think this would be sufficient to comply with the test (in fact you have
worst case situation, as you use more strict specification for your

Best regards,

Frank van der Zanden
Bactimm BV - the Netherlands

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