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Differentiation of Animal Fats from Different Origins: Use of Polymorphic Features Detected by Raman Spectroscopy

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Abstract:

Food safety requires the development of reliable techniques that ensure the origin of animal fats. In the present work, we try to verify the efficacy of using the polymorphic features of fats for discriminating animal-fat origins. We use Raman spectroscopy to collect the structural information of fat crystals. It is shown that a single Raman band at 1417 cm–1 successfully differentiates pork fats from beef fats. This band is known to be characteristic of the β′-polymorph of fats. Pork fats show this band because they contain the β′-polymorph after rapid cooling to 0 °C. In beef–pork-fat mixtures, this band is not detected even in the presence of 50% pork fat; an addition of beef fat to pork fat is likely to produce a mixed fat with a completely different polymorphic behavior. This method seems to have the potential to detect beef products contaminated with pork-adipose tissue.

Keywords: BEEF TALLOW; CRYSTAL; LARD; POLYMORPHISM; RAMAN SPECTROSCOPY; TRIACYLGLYCEROL; VIBRATIONAL SPECTROSCOPY; β′-POLYMORPH

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210793335070

Affiliations: 1: Animal Products Research Team, National Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan; Department of Chemistry, Graduate School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 2: Department of Chemistry, Graduate School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 3: Animal Products Research Team, National Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan 4: Department of Chemistry, Graduate School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Department of Applied Chemistry, College of Science, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan 300, Republic of China. hhama@chem.s.u-tokyo.ac.jp

Publication date: November 1, 2010

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