GC-MS Studies on Derivatization of Creatinine and Creatine by BSTFA and Their Measurement in Human Urine
作者:Olga Begou、Kathrin Weber、Bibiana Beckmann、Dimitrios Tsikas
DOI:10.3390/molecules26113206
日期:——
creatinine by gas chromatography (GC)-based methods requires derivatization of its amine and keto groups. Creatinine exists in equilibrium with its open form creatine (methylguanidoacetic acid, MW 131.1), which has a guanidine and a carboxylic group. Trimethylsilylation and trifluoroacetylation of creatinine and creatine are the oldest reported derivatization methods for their GC-mass spectrometry (MS)
考虑到其相对恒定的尿排泄率,肌酐(2-氨基-1-甲基-5 H尿中的-imidazol-4-one,MW 113.1)是有用的内源性生化参数,可校正多种内源性和外源性物质的尿排泄率。通过基于气相色谱(GC)的方法可靠地测量肌酐需要对其胺基和酮基进行衍生化。肌酐与其开放式肌酸(甲基胍基乙酸,MW 131.1)处于平衡状态,肌酸具有胍基和羧基。肌酸酐和肌酸的三甲基甲硅烷基化和三氟乙酰化是人类血清中使用火焰或电子电离进行GC-质谱(MS)分析的最古老的衍生化方法。我们对肌酸酐的衍生化(d进行GC-MS研究0 -creatinine),[ methylo - 2 ħ 3]肌酐(d 3 -creatinine,内标),肌酸(d 0 -肌酸)与Ñ,ö -双在没有(三甲基硅烷基)三氟乙酰胺使用标准衍生化条件(BSTFA)(60分钟,60℃),但任何基础。反应产物的特征在于负离子化学电离(NICI)和正离子