| Formation of guaiacol in chocolate milk by the psychrotrophic bacterium Rahnella aquatilis. | |
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MedLine Citation:
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PMID: 11696092 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS: The aim of this study was to identify the causative agent of a smoky/phenolic taint in refrigerated full cream chocolate milk. METHODS AND RESULTS: Microbiological examination of spoiled and unspoiled milk samples from the same processor showed high numbers of the psychrotrophic coliform Rahnella aquatilis in the spoiled samples only. Gas chromatography/mass spectrometry (GC/MS) was used to identify and quantify the taint compound as guaiacol (2-methoxyphenol) in the spoiled milk. Challenge studies in UHT chocolate and white milks inoculated with the isolate and incubated at 4-5 degrees C and 8-9 degrees C for 6 d showed the production of guaiacol in chocolate milk only, which was confirmed and quantified by GC/MS. CONCLUSIONS: The results indicate that if present in refrigerated chocolate milk, Rah. aquatilis can produce guaiacol within the expected shelf-life of the product, even without temperature abuse. SIGNIFICANCE AND IMPACT OF THE STUDY: This is the first report that the coliform Rah. aquatilis can produce guaiacol in refrigerated chocolate milk products. |
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Authors:
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N Jensen; P Varelis; F B Whitfield |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Letters in applied microbiology Volume: 33 ISSN: 0266-8254 ISO Abbreviation: Lett. Appl. Microbiol. Publication Date: 2001 Nov |
Date Detail:
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Created Date: 2001-11-06 Completed Date: 2002-05-02 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8510094 Medline TA: Lett Appl Microbiol Country: England |
Other Details:
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Languages: eng Pagination: 339-43 Citation Subset: IM |
Affiliation:
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Food Science Australia, PO Box 52, North Ryde, NSW 1670, Australia. nancy.jensen@csiro.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Benzaldehydes Cacao / microbiology* Cold Temperature Colony Count, Microbial Food Microbiology Food Preservation Gas Chromatography-Mass Spectrometry Guaiacol / chemistry, metabolism* Milk / microbiology* Rahnella / growth & development, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Benzaldehydes; 121-33-5/vanillin; 90-05-1/Guaiacol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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