title: Effect of ageing prior to freezing on colour stability of ovine longissimus muscle.
abstract: The effect of different ageing periods (0, 2 and 3 weeks at -1.5°C) of lamb loins (n=24) prior to freezing (9, 7 and 6 weeks at -18°C, respectively) compared to the aged-only (never frozen) lamb for 9 weeks postmortem on colour stability during display was assessed under high-oxygen modified atmosphere (HiOx-MAP; 80% O(2)) and oxygen permeable overwrap packaging conditions. The aged/frozen loins and aged-only loins in HiOx-MAP had similar (P>0.05) surface redness, colour intensity, and discolouration. Further, no significant difference found in shear force between the loins aged 3 weeks/frozen 6 weeks and the aged-only loins. However, more lipid oxidation (P<0.05) was found in the aged-only compared to the aged/frozen loins in HiOx-MAP throughout display. These results suggest that ageing loins prior to freezing would provide equivalent tenderness and colour stability, and better lipid oxidation stability compared to the aged-only loins under HiOx-MAP.
authors.affiliation: AgResearch Ltd, Ruakura Research Centre, Private Bag 3123, Hamilton 3240, New Zealand. brad.kim@agresearch.co.nz
authors.forename: Yuan H Brad
authors.initials: YH
authors.lastname: Kim
authors.forename: Matilde
authors.initials: M
authors.lastname: Frandsen
authors.forename: Katja
authors.initials: K
authors.lastname: Rosenvold
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D003080:Cold Temperature; D005511:Food Handling / Q000379:methods*; D018857:Food Packaging / Q000379:methods; D005519:Food Preservation; D006863:Hydrogen-Ion Concentration; D008315:Malondialdehyde / Q000378:metabolism; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry* / Q000378:metabolism; D010100:Oxygen / Q000009:adverse effects; D010858:Pigmentation; D011786:Quality Control; D033081:Shear Strength; D034561:Sheep, Domestic; D013499:Surface Properties; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D013997:Time Factors; D014618:Vacuum
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D008315:Malondialdehyde; D010100:Oxygen