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Food Microbiol

Title:		Comparing PTR-MS profile of milk inoculated with pure or mixed cultures of spoilage bacteria
Author(s):		Alothman M; Lusk KA; Silcock P; Bremer PJ;
Address:		"Department of Food Science, University of Otago, 276 Leith Walk, 9054 Dunedin, New Zealand. Electronic address: mohammad.alothman@otago.ac.nz. Department of Food Science, University of Otago, 276 Leith Walk, 9054 Dunedin, New Zealand. Electronic address: karen.lusk@otago.ac.nz. Department of Food Science, University of Otago, 276 Leith Walk, 9054 Dunedin, New Zealand. Electronic address: pat.silcock@otago.ac.nz. Department of Food Science, University of Otago, 276 Leith Walk, 9054 Dunedin, New Zealand. Electronic address: phil.bremer@otago.ac.nz"
Journal Title:		Food Microbiol
Year:		2017
Volume:		20170103
Issue:
Page Number:		155 - 163
DOI:		10.1016/j.fm.2017.01.001
ISSN/ISBN:		1095-9998 (Electronic) 0740-0020 (Linking)
Abstract:		"The volatile organic compounds (VOCs) associated with UHT milk (n=8) inoculated with either pure inoculums of Pseudomonas fluorescens (two strains tested) or Chryseobacterium sp., or with mixed cultures of 2 or all 3 of the bacterial strains, and held at 4.5 degrees C for up to 26 days was measured using proton transfer reaction - mass spectrometry (PTR-MS). The VOCs evolved included a range of carbonyl compounds, alcohols, esters, and acids and had significant qualitative and quantitative differences between the inoculums. Milks inoculated with paired (mixed) bacterial cultures attained patterns similar to the VOC composition of one of the pure inoculums, which could be attributed to the domination of these bacteria within the mixed inoculum. This study will help to characterize the spoilage of milk and provide important insights into understanding the factors that limit the shelf life of milk"
Keywords:		Animals Chryseobacterium/*metabolism *Food Contamination Food Storage Hot Temperature Mass Spectrometry/methods Milk/*chemistry/*microbiology Protons Pseudomonas fluorescens/*metabolism Time Factors Volatile Organic Compounds/*analysis Chryseobacterium In;
Notes:		"MedlineAlothman, Mohammad Lusk, Karen A Silcock, Patrick Bremer, Phil J eng Comparative Study England 2017/02/19 Food Microbiol. 2017 Jun; 64:155-163. doi: 10.1016/j.fm.2017.01.001. Epub 2017 Jan 3"