HS-SPME gas chromatographic characterization of ...
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| Title | HS-SPME gas chromatographic characterization of volatile compounds in milk tainted with off-flavour |
| Author(s) | A. Mounchili, J. Wichtel, J. Bosset, I. Dohoo, M. Imhof, D. Altieri, S. Mallia, H. Stryhn |
| Journal | International Dairy Journal |
| Date | 2005 |
| Volume | 15 |
| Issue | 12 |
| Start page | 1203 |
| End page | 1215 |
| 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 12 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 30 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 3 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.. |
| DOI | 10.1016/j.idairyj.2004.11.018 |
| ISSN | 0958-6946 |
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