%0 Conference Paper
%A Mallia, Silvia
%A Escher, Felix
%A Rehberger, Brita
%A Schlichtherle-Cerny, Hedwig
%D 2007
%F orgprints:9734
%K Butter, Aroma, PUFA, CLA, Olfactometry
%T Aroma-active secondary oxidation products of butter
%U http://orgprints.org/9734/
%X Butter contains vitamins, minerals and unsaturated lipids, such as polyunsaturated fatty acids (PUFA) and conjugated linoleic acids (CLAs). However the oxidative stability and consequently the shelf-life of milk products are inversely correlated with their PUFA and CLA content.  The objective of this study is the evaluation of the oxidative stability and sensory quality of PUFA/CLA-enriched butter versus conventional butter, with both types of butter being produced at ALP. For this purpose, new chemical and sensory-based methods will be developed, as well holistic complementary methods.  This paper focuses on a preliminary study achieved using conventional butter, subjected to a long storage and to oxygen and light exposure, to develop a gas chromatography olfactometry (GC-O) method able to detect the aroma-active compounds originated from oxidation. This will be one of the methods used for the evaluation of the oxidative stability of PUFA/CLA-enriched butter.