Microhole size and foodstuff on the microbial integrity of aseptic plastic cups

Raija Ahvenainen, Tiina Mattila-Sandholm, Lena Axelson, Gun Wirtanen

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


Penetration of a motile microbe, Enterobacter aerogenes, was investigated through aseptic packages filled with milk, meat soup, sausage gravy and soft agar. Penetration was dependent on the microhole diameter and on the viscosity of the foodstuff in the package. The smallest microhole diameter permitting the passage of E. aerogenes in this study was 5 μm when the packages were filled with milk and the microhole length was 40 μm. While the packages were filled with soft agar, meat soup and sausage gravy, the smallest penetrable microhole was 10, 20 and 25 μm in diameter, respectively. On the other hand, even the microholes of 100μm diameter were not penetrated by E. Aerogenes in every package tested. This may have been owing to blockage of the microholes by the test foodstuff thus hindering the penetration of bacteria.
Original languageEnglish
Pages (from-to)101-107
JournalPackaging Technology and Science
Issue number2
Publication statusPublished - 1992
MoE publication typeNot Eligible


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