Maintenance of sterility in 1-mL polypropylene syringes

Serafin Gonzalez, Darlene Miller, Steven P. Murphy

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Purpose. The sterility of syringes filled with a growth-promoting broth when stored under various temperature conditions was studied. Methods. Samples of tryptic soy broth (TSB) were injected into 150 1-mL polypropylene syringes and incubated at 33-37 °C for 14 days, after which time they were visually inspected for microbial contamination. In addition to visual inspection, the sterility of all syringes was tested by inoculating samples into 10-mL tubes of thioglycollate broth, incubating at 35°C, and observing for growth for 5 days. After the 14-day incubation period, 30 syringes were removed for sterility validation and microbial growth promotion. TSB from 15 syringes was transferred into sterile culture tubes and challenged with Staphylococcus aureus, Escherichia coli, Bacillus cereus, Candida albicans, and Aspergillus niger. The remaining 120 syringes were repackaged and stored at room temperature (22°C), in a refrigerator (5°C), or in a freezer (-20°C). The sterility of the samples was evaluated at 30 days, 45 days, three months, and six months. Results. No microbial growth was detected by visual inspection in any of the 15 syringes examined for turbidity during validation testing. All study syringes (n = 120) remained sterile throughout the respective evaluation periods, regardless of storage condition. Conclusion. Growth-promoting broth stored in 1-mL polypropylene syringes remained sterile when stored at room temperature, in a refrigerator, or in a freezer for six months.

Original languageEnglish (US)
Pages (from-to)1962-1964
Number of pages3
JournalAmerican Journal of Health-System Pharmacy
Issue number18
StatePublished - Sep 15 2007


  • Contamination
  • Injections
  • Polypropylene
  • Stability
  • Sterility
  • Storage
  • Syringes
  • Temperature
  • Turbidity

ASJC Scopus subject areas

  • Pharmaceutical Science
  • Leadership and Management
  • Medicine(all)


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