氧化初期金属离子强度对动物体脂氧化的影响效果

Influence of metal ion effect on yak body-fat during initial autoxidation stage

研究了不同浓度金属离子(Fe2+、Ca2+、Cu2+、Mg2+)对牦牛体脂硫代巴比妥酸反应产物(TBARS)的影响效果。经0.1mol/LCu2+处理后的动物体脂TBARS在第25d超过0.5mg/kg,显著提高氧化程度(p<0.05),该浓度可作为抑制氧化的参考浓度。1mol/LFe2+处理下TBARS较其他各组明显降低(p<0.05),0.05mol/L处理组能较大程度上促进氧化过程。各浓度Mg2+处理后的TBARS呈逐步上升趋势,但变化趋势总体弱于Fe2+。不同浓度Ca2+对氧化初期TBARS的变化影响较为一致,且与空白组相差不大(p>0.05)。结论为动物体脂储藏和加工选用恰当的金属螯合剂和复配抗氧化剂含量提供参考。

The aim of the this paper was to study influence of TBARS treated with different metal ion during initial yak fat autoxidation. The result showed that the changes of TBARS treated with 0.1mol/L Cu2. over 0.5mg/kg and significantly increased the level of TBARS at 25d（p〈0.05）,which could be used as indicating concentration for decreasing oxidation. TBARS treated with lmol/L Fe2＋ reached 0.5mg MDA/kg which was lower than others （p〈0.05） at 20d. However,it was same result for TBARS treated by different concentration of Ca2＋,which was near to CK （p〉0.05）. Effect of oxidation treated by each concentration of Mg2＋ was weaker than by Fe2＋. The conclusion should be relevance valuable for choosing metal chelating agent and mixed antioxidants in the future.