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Open Access Evaluation of preservative systems in opthalmic suspension of polymyxin B and dexamethasone by linear regression

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An ophthalmic suspension of polymyxin B and dexametasone with 13 different preservative systems was evaluated by a linear regression method for rapid screening, using D-values. The products were challenged against Pseudomonas aeruginosa, Burkholderia cepacia, Staphylococcus aureus, Candida albicans and Aspergillus niger. Since linear regression showed correlation coefficients higher than 0.84 the decimal reduction time (D-value) was then calculated. The comparison of D-values obtained for each microorganism and each product led to the selection of the formula 9 = 10, which was selected to be submitted to the efficacy of antimicrobial preservation according to the European Pharmacopoeia.

Document Type: Research Article


Affiliations: 1: Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brasil 2: Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Avenida Professor Lineu Prestes, 580, São Paulo, 05508-900, Brasil, Email:

Publication date: 2007-03-01

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  • Pharmazie is a leading journal in the field of pharmaceutical sciences. As a peer-reviewed scientific journal, Pharmazie is regularly indexed in the relevant databases like Web of science, Journal Citation Reports and many others. The journal is open for submissions from the whole spectrum of pharnaceutical sciences including Pharmaceutical Chemistry, Experimental and Clinical Pharmacology, Drug Analysis, Pharmaceutics, Pharmaceutical Biology, Clinical Pharmacy etc.
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