摘要目的:检测体外培养不同级别早期人胚胎的培养液中氨基酸和肉碱水平，探讨基于质谱的微量分析技术用于评价胚胎体外发育潜能的可行性。方法:从2022年6至12月在临沂市人民医院生殖医学科接受体外受精-胚胎移植治疗的不孕夫妇中，收集女方年龄31.5（26.5，33.25）岁，且获卵数在8~20个的不孕夫妇，从中随机挑选30对不孕夫妇收取其第3天细胞胚的培养液共126份，依据其所对应的胚胎的形态级别分为优（ n=43）、中（ n=49）和差3（ n=34）组。通过液相色谱-质谱联用检测不同培养液中氨基酸和肉碱水平。通过方差分析比较不同组间氨基酸与肉碱水平的差异，通过Pearson相关分析氨基酸与肉碱水平的关联，偏最小二乘法分析氨基酸和肉碱水平与胚胎评估级别的关联。 结果:甲硫氨酸/苯丙氨酸（比值）在优胚、中胚和差胚3组间分别为3.09±1.67、4.00±1.19和4.99±2.04，差异有统计学意义（ F=7.09， P<0.05），优胚与中胚间（ t=-0.91， P<0.05）、优胚与差胚间（ t=-1.91， P<0.05）及中胚与差胚间（ t=-0.99， P<0.05）差异均有统计学意义。不同氨基酸之间，苯丙氨酸与酪氨酸的正相关性最强（ r=0.99， P<0.01）；不同肉碱之间，辛酰肉碱与葵酰肉碱比值（C 8/C 10）与（戊二酰肉碱+3-羟基己酰肉碱）/棕榈酰肉碱比值［（C 5DC+C 6OH）/C 16］的正相关性最强（ r=0.44， P<0.001）；偏最小二乘法拟合模型计算氨基酸/肉碱水平与胚胎级别相关的权重：亮氨酸（异亮氨酸）为2.22，精氨酸为1.99，缬氨酸/苯丙氨酸为1.65，甘氨酸为1.54，酪氨酸为1.21，（戊二酰肉碱+3-羟基己酰肉碱）/辛酰肉碱（C 5DC+C 6OH）/C 8为1.15。 结论:胚胎培养液中亮氨酸、精氨酸、缬氨酸/苯丙氨酸比值、甘氨酸、酪氨酸以及肉碱比值（C 5DC+C 6OH）/C 8与体外培养人早期胚胎级别显著相关。

abstractsObjective:In order to determine the development potential of human embryos in vitro, amino acid and carnitine levels were measured in the culture medium of different grades of early human embryos. Methods:From the infertile couples who received in vitro fertilization-embryo transfer treatment in the Department of Reproductive Medicine of Linyi People′s Hospital from June 2022 to December 2022, the age of the women was defined as 25-35 years old [31.5(26.5, 33.25)] with 8-20 eggs, 126 cultured cells and embryos of the third day were randomly collected from infertile couples. They were divided into three groups according to the morphological level of the corresponding embryos: excellent, neutral and poor. Amino acids and L-carnitines levels in culture medium were detected by liquid chromatography-mass spectrometry (LC-MS). Using analysis of variance to compare differences among groups, correlation analysis, factor analysis was performed to analyze the association between the levels of amino acids and L-carnitines and development potential of early human embryos.Results:The value of Methionine/Phenylalanine was found statistically different among superior embryo (3.09±1.67), moderate embryo (4.00±1.19) and inferior embryo (4.99±2.04). The difference between the three groups was statistically different ( F=7.09, P<0.05): superior embryo vs moderate embryo ( t=-0.91, P<0.05), superior embryo vs inferior embryo ( t=-1.91, P<0.05), moderate embryo vs inferior embryo ( t=-0.99, P<0.05). Among different amino acids, Phe had the strongest positive correlation with Tyr ( r=0.99, P<0.01). Among different carnitines, C 8/C 10 has the strongest positive correlation with C 5DC+C 6OH/C 16( r=0.44, P<0.01). The weight value of leucine (isoleucine), arginine, valine/phenylalanine, glycine, tyrosine and carnitine(C 5DC+C 6OH)/C 8 calculated by the least square fitting model is 2.22, 1.99, 1.65, 1.54, 1.21 and 1.15 respectively. Conclusion:Leucine, arginine, valine/phenylalanine, glycine, tyrosine and carnitine (C 5DC+C 6OH)/C 8 in embryo culture medium were significantly correlated with the levels of early human embryos in vitro.