Abstract: Dairy quality can be affected by different packages, which has received more attention recently. Pure milk samples with three kinds of packages including PrePak, Tetra Pillow and Tetra Brik were measured by an array composed of 13 gas sensors. Mean differential coefficients were used for feature extraction. Pure milk samples with three kinds of packages was discriminated by Fisher discriminant analysis (FDA) and Back-Propagation network (BPN). The results showed that pure milk with three kinds of packages could be discriminated well using electronic nose according to quality changes during storage.

Key words: pure milk, package, electronic nose, Fisher discriminant analysis (FDA), back-propagation network (BPN)