Aqueous extracts from some muscles inhibit hemoglobin-mediated oxidation of cod muscle membrane lipids.
It was evaluated whether trout hemoglobin (Hb)-mediated oxidation of minced washed cod muscle lipids could be prevented by an aqueous isolate from cod and some other muscle sources. Lipid hydroperoxides and painty odor developed approximately 4 days faster in washed than unwashed cod mince. When adding back an aqueous fraction (press juice) isolated from unwashed mince to washed mince at 2-6-fold dilutions, development of hydroperoxides and painty odor was either delayed or completely prevented. The inhibitory substances were heat stable, and their effect was slightly reduced at reduced pH. The <1 kDa fractions of whole and heated press juices were as inhibitory as the unfractionated press juices. Inhibition by the unheated, heated, and ultrafiltered (30 kDa) press juices was lost after dialysis. These findings implied the presence of one or more highly effective aqueous low molecular weight antioxidants in cod muscle press juice. The same antioxidative properties were found in heated haddock, dab, and winter flounder muscle press juices but not in heated herring and chicken muscle press juices. Unheated chicken press juice was however highly inhibitory.
Department of Food Science, Chalmers University of Technology, P.O. Box 5401, S-402 29 Göteborg, Sweden. ingrid.undeland@fsc.chalmers.se
Ingrid
I
Undeland
Herbert O
HO
Hultin
Mark P
MP
Richards
D000818:Animals; D000975:Antioxidants / Q000032:analysis; D002645:Chickens; D003956:Dialysis; D005399:Fishes; D006454:Hemoglobins / Q000032:analysis / Q000378:metabolism*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D015227:Lipid Peroxidation; D008563:Membrane Lipids / Q000378:metabolism*; D009132:Muscles / Q000737:chemistry*; D017686:Oncorhynchus mykiss; D010084:Oxidation-Reduction; D011506:Proteins / Q000032:analysis; D014020:Tissue Extracts / Q000494:pharmacology*; D014462:Ultrafiltration; D014867:Water
D000975:Antioxidants; D006454:Hemoglobins; D008563:Membrane Lipids; D011506:Proteins; D014020:Tissue Extracts; D014867:Water