Changes of Texture, Microstructure and Free Fatty Acid Contents of Lighvan Cheese during Accelerated Ripening with Lipase

Authors
M. Aminifar 1
Z. Emam-Djomeh 2
1 Department of Food science and Technology, Faculty of Food Industry and Agriculture, Standard Research Institute (SRI), P. O. Box: 31745-139, Karaj, Islamic Republic of Iran.
2 Transfer Phenomena Laboratory (TPL), Department of Food Science, Technology and Engineering, Faculty of Agricultural Engineering and Technology, Agricultural Campus, University of Tehran, P. O. Box: 31587-11167 Karaj, Islamic Republic of Iran.
Abstract
In this study, the effect of addition of three different levels of microbial lipase (0, 4, and 8.0 g lipase in 100 kg milk) was investigated on the physiochemical properties, free fatty acids, textural properties, and microstructure of Lighvan cheese during ripening. The addition of lipase did not significantly affect pH, acidity, moisture, and salt content of Lighvan cheese, but increased its free fatty acid content considerably. It also increased hardness and decreased the brittleness of Lighvan cheese in all stages of ripening. The number and the mean diameter of fat globules, which were entrapped in casein network, were affected by all levels of the added lipase. Following the addition of lipase to Lighvan cheese and after 90 days of ripening, individual fat globules or their aggregates totally disappeared and some fingerprints of fat were observed. Disappearance of fat globules along with increase in protein matrix junctions leads to uniform structure of casein consisting voids which are produced from fermentation.

Keywords

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Journal of Agricultural Science and Technology
Volume 16, Issue 1
January and February 2014
Pages 113-123