Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8979258 | International Dairy Journal | 2005 | 13 Pages |
Abstract
Milk samples, collected from nine healthy mid-lactation Holstein cows, were analysed organoleptically by two sensory panels, and chromatographically using mass spectrometry/flame ionization (MSD/FID) and olfactometric detectors. The sensory panels found that the samples collected after the cows were forage-starved for approximately 12Â h were of good flavour quality, whereas at least 89% of the samples collected after they were fed baled grass silage were tainted with off-flavour characterized as “feed”. The corresponding MSD/FID chromatograms revealed that 30Â min post-feeding samples had significantly (p<0.05) higher concentrations of ethanol, propane-2-one, dimethyl sulphide, butane-2-one, hexanal, heptanal and octane-2,3-dione, whereas 3Â h post-feeding samples showed higher concentrations of four of these compounds (propane-2-one, dimethyl sulphide, butane-2-one and hexanal). Olfactometric analysis performed on five milk samples (four off-flavoured and one of good flavour quality) revealed approximately 75 aroma-active compounds. Nearly all these compounds were common to all the analysed milk extracts (both off-flavoured and good quality samples), suggesting that off-flavour originated from the concentration differences of a common set of compounds rather than from the absence or presence of specific compounds.
Keywords
Related Topics
Life Sciences
Agricultural and Biological Sciences
Food Science
Authors
A. Mounchili, J.J. Wichtel, J.O. Bosset, I.R. Dohoo, M. Imhof, D. Altieri, S. Mallia, H. Stryhn,