Evaluation of Blow/Fill/Seal Extrusion through Processing Polymer Contaminated with Bacterial Spores and Endotoxin

Abstract

A study has been carried out to further the understanding of the extrusion process and its impact upon the quality of Blow/Fill/Seal product. Controlled challenges to the extrusion system, comprising low-density polyethylene granulate contaminated with characterized levels of Bacillus atrophaeus (ATCC 9372) endospores and Escherichia coli 055:B5 bacterial endotoxin, have been conducted. Batches of spore contaminated polymer, at challenge levels varying from 10³ to 10⁶ spores g⁻¹ polymer with derived D₁₆₀ values ranging from 1.22 to 2.07 minutes, and endotoxin contaminated polymer, at challenge levels varying from 10² to 10⁴ EU g⁻¹ polymer, were processed through a Blow/Fill/Seal machine employing Tryptone Soya Broth and Water for Injection as the fill mediums, respectively. Relationships have been established between the levels of challenge for each of spores and endotoxin and the extent of product contamination. The relationships allow for prediction of microbiological and pyrogenic quality based upon the microbiological and pyrogenic attributes of unprocessed polymeric granulate and for rationalized choices of polymeric granulate acceptance limits. It is stressed that the findings apply only to the particular Blow/Fill/Seal machine and to the specific conditions of machine operation.