Quantitation of <i>N</i><sup>2</sup>-[1-(1-Carboxy)ethyl]folic Acid, a Nonenzymatic Glycation Product of Folic Acid, in Fortified Foods and Model Cookies by a Stable Isotope Dilution Assay
作者:Michael Rychlik、Anja Mayr
DOI:10.1021/jf0503311
日期:2005.6.1
85% of its initial content was retained for the disaccharides lactose and sucrose, respectively. Of the degraded amount of FA, CEF comprised 28% for fructose as well as 18, 12, and 8% for sucrose, lactose, and glucose, respectively. Therefore, CEF can be considered an important degradation product of FA in baked foods made from fructose. To retain a maximum amount of FA, products should rather be baked
通过使用[(2)H(4)] CEF作为内标,开发了用于定量N(2)-[1-(羧基)乙基]叶酸(CEF)的稳定同位素稀释测定法(SIDA)。通过阴离子交换色谱法净化样品后,液相色谱-串联质谱的三维特异性使得叶酸(FA)的非酶糖基化产物的确定性得以明确。当将CEF添加到玉米淀粉中时,发现CEF的检出限为0.4微克/ 100克,测定的回收率为98.5%。在曲奇分析中,批内变异系数为8.0%(n = 5)。将SIDA应用于由FA强化的小麦粉制得的商品曲奇中,发现CEF含量高达7.1 microg / 100 g,约占曲奇FA含量的10-20%。在婴儿食品中 多种维生素果汁和多种维生素甜食,但是,CEF无法检测到。对由强化面粉和不同碳水化合物制成的饼干烘烤过程中CEF形成的进一步研究表明,果糖最有效地产生CEF,其次是葡萄糖,乳糖和蔗糖,其干重为12.5、3.9、2.5和2.5微克/ 100 g,分