The ISO test for the evaluation of preservative effectiveness requires the use of five different microbial cultures in order to establish the ability of the product to cope with possible microbial challenges that may get into the product during its manufacture or use by consumers. However, only P. aeruginosa was used in the preservation efficacy study described here; results presented in Table 3 showed that nine out of 32 products investigated were poorly preserved. It is probable that, had more than one organism been used, the preservation failure rate in the products investigated would have been higher. The use of one microbial culture in the
challenge test should not be considered a drawback to the setup of this investigation, as it was intended to demonstrate that the contamination-free products may also contain items with poor
microbiological quality, and this was definitely achieved. These findings, in addition to those given in Tables 1 and 2, suggested that a lot of improvement is needed in the various stages of cosmetics manufacture in Jordan. Special attention should be given to the production environment and the formulation process, including the choice of preservative. This should be established in the development stage as part of the microbiological stability study
The ISO test for the evaluation of preservative effectiveness requires the use of five different microbial cultures in order to establish the ability of the product to cope with possible microbial challenges that may get into the product during its manufacture or use by consumers. However, only P. aeruginosa was used in the preservation efficacy study described here; results presented in Table 3 showed that nine out of 32 products investigated were poorly preserved. It is probable that, had more than one organism been used, the preservation failure rate in the products investigated would have been higher. The use of one microbial culture in the
challenge test should not be considered a drawback to the setup of this investigation, as it was intended to demonstrate that the contamination-free products may also contain items with poor
microbiological quality, and this was definitely achieved. These findings, in addition to those given in Tables 1 and 2, suggested that a lot of improvement is needed in the various stages of cosmetics manufacture in Jordan. Special attention should be given to the production environment and the formulation process, including the choice of preservative. This should be established in the development stage as part of the microbiological stability study
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