Addition of grape seed extract and bearberry to porcine diets: Influence on quality attributes of raw and cooked pork |
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Authors: | O'Grady M N Carpenter R Lynch P B O'Brien N M Kerry J P |
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Affiliation: | aDepartment of Food and Nutritional Sciences, University College Cork, National University of Ireland, Western Road, Cork, Ireland bPig Production Department, Teagasc, Moorepark, Fermoy, Co. Cork, Ireland |
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Abstract: | The effect of supplementation of pig diets with grape seed extract (GSE) (100, 300, 700 mg/kg feed) and bearberry (BB) (100, 300, 700 mg/kg feed) for 56 days pre-slaughter, on the oxidative stability and quality of raw and cooked M. longissimus dorsi (LD) was examined. Susceptibility of porcine liver, kidney and heart tissue homogenates to iron-induced (1 mM FeSO4) lipid oxidation was also investigated. In raw LD steaks, stored in modified atmosphere packs (75% O2:25% CO2) (MAP) for up to 16 days at 4 °C, surface lightness (CIE ‘L’ value), redness (CIE ‘a’ value), lipid stability (TBARS, mg MDA (malondialdehyde)/kg muscle) and pH were not significantly affected by supplemental GSE or BB. Similarly, the oxidative stability and sensory properties of cooked LD steaks, stored in MAP (70% N2:30% CO2), for up to 28 days at 4 °C, were not enhanced by dietary GSE or BB. Iron-induced lipid oxidation increased in liver, kidney and heart tissue homogenates over the 24 h storage period and susceptibility to oxidation followed the order: liver > heart > kidney. Dietary GSE or BB did not significantly reduce lipid oxidation in tissue homogenates. Potential reasons for the lack of efficacy of supplemental GSE and BB on pork quality were explored. |
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Keywords: | Grape seed extract Bearberry extract Lipid oxidation Pork |
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