The bioavailability of docosahexaenoic acid(DHA) and eicosapentaenoic acid(EPA) depends on their chemical forms. This study investigated the long-term effects of DHA-bound triglyceride(TG-DHA), DHA-bound phospholipid(PL-DHA), and the combination of TG-DHA and egg yolk phospholipid(Egg-PL) on lipid metabolism in mice fed with a high-fat diet(fat levels of 22.5%). Male C57BL/6J mice were fed with different formulations containing 0.5% DHA, including TG-DHA, PL-DHA, and the combination of TG-DHA and Egg-PL, for 6 weeks. Serum, hepatic, and cerebral lipid concentrations and the fatty acid compositions of the liver and brain were determined. The concentrations of serum total triglyceride(TG), total cholesterol(TC), high-density lipoprotein cholesterol(HDL-c), and hepatic TG in the PL-DHA group and the combination group were significantly lower than those in the high-fat(HF) group(P < 0.05). Atherogenic index(AI) of the PL-DHA group was significantly lower than that of the combination group(P < 0.05). Hepatic TC level in the combination group was significantly lower than that in the HF group(P < 0.05), but no significant difference was observed between the combination group and the PL-DHA group. Both the PL-DHA and the combination groups showed significantly increased DHA levels in the liver compared with the HF group(P < 0.05). However, there were no obvious increases in the cerebral DHA levels in all DHA diet groups. These results suggest that PL-DHA was superior to the combination of TG-DHA and Egg-PL in decreasing the AI. Long-term dietary supplementation with low amount of DHA(0.5%) may improve hepatic DHA levels, although cerebral DHA levels may not be enhanced.
CHE HongxiaCUI JieWEN MinXU JieTeruyoshi YanagitaWANG QiXUE ChanghuWANG Yuming
目的建立水产品中氧化三甲胺（trimethylamine-N-oxide,TMAO）的高效液相色谱法-质谱联用（HPLC-MS/MS）分析方法,并对2种常见水产品的TMAO含量进行测定。方法待测物通过色谱柱分离,以10mmol/L甲酸铵为流动相A,含5 mmol/L甲酸铵、25%甲醇、0.1%甲酸溶液为流动相B进行梯度洗脱,流速为0.8 m L/min,采用多反应监测（MRM）检测不同撞击电压下母离子碎裂情况,并选择合适电压下的离子对定量;利用所建立方法测定阿根廷鱿鱼和凡纳宾对虾中TMAO含量。结果当撞击电压均设定为20 e V,确定定量离子对为m/z 76→58.2时,5~1000μg/L范围内线性关系良好;4种水产品TMAO回收率在83.15%~90.23%之间。结论所建HPLC-MS/MS测定TMAO的方法,特异性好,灵敏度高,快速准确,可用于水产品中TMAO含量的分析测定。
