Variation in the cross-linking pattern of porcine myofibrillar protein exposed to three oxidative environments

Youling L. Xiong, Donkeun Park, Tooru Ooizumi

Research output: Contribution to journalArticlepeer-review

211 Scopus citations

Abstract

Myofibrillar protein (MP, 26 mg protein/mL in 0.6 M NaCl, pH 6.0) prepared from pork serratus ventralis muscle was incubated at 4°C for 24 h with three oxidizing systems: (1) an iron-catalyzed oxidizing system (IOS: 10 μM FeCl3, 0.1 mM ascorbic acid, and 0.05-5.0 mM H2O 2), (2) a linoleic acid-oxidizing system (LOS: 0.05-5.0 mM linoleic acid and 3750 units of lipoxidase/mL), or (3) a H2O 2-activated metmyoglobin-oxidizing system (MOS: 0.05-0.5 mM metmyoglobin/ H2O2). Oxidation in IOS and MOS promoted extensive, dose-dependent cross-linking and insolublization of MP, notably myosin, while the effect of LOS was minimal. Chymotrypsin digestion indicated that the rod (tail) subfragment of myosin was the preferred target of hydroxyl radicals and ferryl oxygen species, although the s-1 (head) region was also susceptible. Disulfide bonds were responsible for most of the cross-linking, and malonaldehyde appeared to contribute to the cross-linking as well. However, dityrosine was minimally involved. Overall, the systems that generate hydroxyl radicals and ferryl oxygen species were more potent than the system that produces peroxide in the cross-linking and aggregation of MP; such covalent links were implicated in the functionality changes of low-temperature-processed muscle foods.

Original languageEnglish
Pages (from-to)153-159
Number of pages7
JournalJournal of Agricultural and Food Chemistry
Volume57
Issue number1
DOIs
StatePublished - Jan 14 2009

Keywords

  • Dityrosine
  • Myofibrillar protein
  • Myosin
  • Protein oxidation
  • SDS-PAGE
  • TBARS

ASJC Scopus subject areas

  • General Chemistry
  • General Agricultural and Biological Sciences

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