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The effect of ice-cream-scoop water on the hygiene of ice cream

Published online by Cambridge University Press:  01 August 1997

I. G. WILSON
Affiliation:
Northern Ireland Public Health Laboratory, Belfast City Hospital Trust, Lisburn Road, Belfast BT9 7AD, UK
J. C. N. HEANEY
Affiliation:
Northern Ireland Public Health Laboratory, Belfast City Hospital Trust, Lisburn Road, Belfast BT9 7AD, UK
S. T. C. WEATHERUP
Affiliation:
Biometrics Department, Department of Agriculture for Northern Ireland, The Agriculture and Food Science Centre, Newforge Lane, Belfast BT9 5PX, UK
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Abstract

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A survey of unopened ice cream, ice cream in use, and ice-cream-scoop water (n=91) was conducted to determine the effect of scoop water hygiene on the microbiological quality of ice cream. An aerobic plate count around 106 c.f.u. ml−1 was the modal value for scoop waters. Unopened ice creams generally had counts around 103–104 c.f.u. ml−1 and this increased by one order of magnitude when in use. Many scoop waters had low coliform counts, but almost half contained >100 c.f.u. ml−1. E. coli was isolated in 18% of ice creams in use, and in 10% of unopened ice creams. S. aureus was not detected in any sample. Statistical analysis showed strong associations between indicator organisms and increased counts in ice cream in use. EC guidelines for indicator organisms in ice cream were exceeded by up to 56% of samples.

Type
Research Article
Copyright
© 1997 Cambridge University Press