title: Antioxidant properties of carnosine re-evaluated in a ferrylmyoglobin model system and in cooked pork patties.
abstract: The antioxidative effect of purified carnosine (i.e., separated from the common contaminant hydrazine) has been evaluated in two systems: (i) Carnosine was found to possess poor reducing properties toward the prooxidant ferrylmyoglobin; at pH approximately 5 the presence of carnosine did not increase the rate of reduction of MbFe(IV)=O compared to autoreduction, whereas at pH 7.4 the rate constant for reduction by carnosine was 0.010 +/- 0.002 M(-1).s(-1) (I = 0.16; 25.0 degrees C). (ii) In cooked pork patties prepared from meat (longissimus dorsi and masseter) with purified or nonpurified carnosine added, the effect of purified carnosine was insignificant when compared to control patties, whereas patties with carnosine contaminated with hydrazine had a lower oxidation level than patties with purified carnosine. Carnosine is concluded not to deactivate the prooxidant ferrylmyoglobin and not to have any antioxidative effect in cooked pork.
authors.affiliation: Department of Dairy and Food Science, Food Chemistry, Royal Veterinary and Agricultural University, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark.
authors.forename: Charlotte U
authors.initials: CU
authors.lastname: Carlsen
authors.forename: Maiken
authors.initials: M
authors.lastname: Kröger-Ohlsen
authors.forename: Marianne Nissen
authors.initials: MN
authors.lastname: Lund
authors.forename: Tina
authors.initials: T
authors.lastname: Lund-Nielsen
authors.forename: Birgitte
authors.initials: B
authors.lastname: Rønn
authors.forename: Leif H
authors.initials: LH
authors.lastname: Skibsted
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002336:Carnosine / Q000032:analysis / Q000494:pharmacology*; D004340:Drug Contamination; D006358:Hot Temperature; D006834:Hydrazines / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008460:Meat / Q000032:analysis*; D008786:Metmyoglobin / Q000737:chemistry*; D010084:Oxidation-Reduction; D013552:Swine; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
chemical_list: D000975:Antioxidants; D006834:Hydrazines; D017392:Thiobarbituric Acid Reactive Substances; C028048:ferrylmyoglobin; D008786:Metmyoglobin; C029424:hydrazine; D002336:Carnosine