Abstract
Reference standards for five commercially important butter and cheddar cheese flavour defects were developed to represent slight, medium, and intensely perceived flavour intensities corresponding to Canada 1, 2, and 3 grade as judged by federal dairy inspectors. Flavour defects were produced as follows: oxidized by exposing milk to 200 Lux at 5°C for 1, 3, and 24h; sour by adding 0.08, 0.16, and 0.24% (w/v) lactic acid; bitter by adding an equal part mixture of L-isoleucine/L-leucine at 0.4, 0.6, and 0.8% (w/v); rancid by adding 0.2% (w/v) lipase and incubating the milk at 35°C for 20, 60, and 90min; and fruity by adding a mixture of esters and alcohols. In addition, the oxidized, sour, and bitter flavours were produced at 6 different levels and evaluated for flavour intensity by a trained panel. The perceived intensities increased with increasing treatment level and were stable over a four day period at 5°C.
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More From: Canadian Institute of Food Science and Technology Journal/Journal de L'Institut Canadien de Science et Technologie Alimentaire
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