Journal
MEAT SCIENCE
Volume 93, Issue 3, Pages 538-546Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2012.11.005
Keywords
Protein oxidation; Bologna type sausages; Phenolic antioxidants; Thiol oxidation; Thiol-quinone-adducts
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Funding
- The Danish Council for Independent Research I Technology and Production within The Danish Agency for Science Technology and Innovation [11-117033]
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Bologna type sausages were prepared from oxidatively stressed pork (UV-irradiation, 48 h, 5 degrees C) using a traditional recipe (control) or the same recipe but added green tea extract (500 ppm total phenolic compounds) or rosemary extract (400 ppm total phenolic compounds). Green tea and rosemary extracts protected against formation of TBARS and protein carbonyls. On the contrary, increased thiol loss and a distinct loss of myosin heavy chain and actin due to polymerization by reducible bonds as determined by SDS-page were found by addition of green tea extract. The enhanced protein polymerization was ascribed to the reaction between quinone compounds from the plant extracts and protein thiol groups to yield phenol-mediated protein polymerization. Analysis by ESR spectroscopy revealed increased radical intensities in sausages added plant extracts, which was ascribed to originate from protein-bound phenoxyl radicals, which may protect against other oxidatively induced protein modifications. (c) 2012 Elsevier Ltd. All rights reserved.
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