Abstract
A filtration method for recovery of viable micro-organisms from petrolatum-based ointments is described. In this method the ointment is dissolved in isopropyl myristate and passed through a filter. Advantages of the method are that all the micro-organisms in the ointment sample are concentrated on the filter pad, and the filter pad can be rinsed to remove antibacterial agents and traces of petrolatum. Markedly higher recoveries were obtained by the proposed method than by methods in common use.
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