Abstract
The interest in application of biocatalysis during natural milk fat flavours development has increased rapidly and lipases have become the most studied group in the development of bovine milk fat flavours. Lipozyme-435, Novozyme-435 and Thermomyces lanuginosus Immobilized (TL-IM) lipases were used to hydrolyze anhydrous milk fat (AMF) and anhydrous buffalo milk fat (ABF) and their volatile flavouring compounds were identified by solid-phase micro-extraction gas chromatography/mass spectrometry (SPME-GC/MS) and then compared at three hydrolysis intervals. Both AMF and ABF after lipolysis produced high amount of butanoic and hexanoic acids and other flavouring compounds; however, highest amount were produced by Lipozyme-435 and Novozyme-435 followed by TL-IM. The hydrolyzed products were assessed by Rancimat-743 for oxidative stability and found both that, for AMF and ABF treated butter oil, Lipozyme-435 and TL-IM were generally more stable compared to Novozyme-435. For both AMF and ABF treated butter oil, Lipozyme-435 was observed to cause no further oxidation consequences which indicates Lipozyme-435 was stable during hydrolysis at 55 °C for 24 h.
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Acknowledgments
The authors gratefully thank the secretary and all members of the group of State Key Laboratory of Food Science and Technology, Synergetic Innovation Center of Food Safety and Nutrition, School of Food Science and Technology, Jiangnan University for their invaluable contributions to the present work. We are also thank Shanghai Kerry Oils & Grains Industries and Novozyme (Shandong) Innovation & Business Center, China for their provision of related raw materials. This work has received funding from the National Natural Science Foundation of China (Grant No. 131401525).
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Omar, K.A., Gounga, M.E., Liu, R. et al. Effects of microbial lipases on hydrolyzed milk fat at different time intervals in flavour development and oxidative stability. J Food Sci Technol 53, 1035–1046 (2016). https://doi.org/10.1007/s13197-015-2158-8
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DOI: https://doi.org/10.1007/s13197-015-2158-8