一种基于HPLC-MS的方法,用于确定食补充剂中D-和L-5-甲基基酸盐异构体比的D-和L-5-甲基酸盐异构体比
Xiaojuan Wang1,2, Deepesh Pandey1,2, Suma Vavilala1,2
1Methods and Application of Food Composition Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD, 20705 USA.
Journal of AOAC International
|September 19, 2025
概括
一种新的HPLC-MS方法准确地量化了补充剂中的5-甲基四基酸 (5-MTHF) 隔离体. 这种经过验证的技术通过检测非活性D-5-MTHF杂质来确保产品的完整性,从而保护消费者.
科学领域:
- 分析化学 分析化学
- 营养科学 营养科学
- 药品分析 药品分析
背景情况:
- 5-甲基四基叶酸 (5-MTHF) 是叶酸的生物活性形式,在食补充剂,特别是产前维生素中至关重要.
- 5-MTHF的合成可以与活性L-5-MTHF一起产生无活性D-5-MTHF,这引发了对产品纯度和有效性的担忧.
- 食补充剂制造商的目标是排除D-5-MTHF,认为它是一种损害产品完整性的杂质.
研究的目的:
- 开发和验证一种高性能液体染色体质谱法 (HPLC-MS) 方法,用于分离和定量5-MTHF二体.
- 为了评估5-MTHF在各种食补充剂矩阵和剂量形式中的体纯度.
- 确保含有5-MTHF的补充剂的准确标签和质量控制.
主要方法:
- 采用单个实验室验证的HPLC-MS方法,使用ChiralPak HSA列和有针对性的选择性离子监测 (有针对性的SIM).
- 作为提取稳定剂,L-氨酸被用作提取稳定剂,移动阶段由酸和酸在酸中组成.
- 该方法根据ICH Q2 ((R1) 准则对包括线性,LOD,LOQ,特异性和回收在内的参数进行了验证.
主要成果:
- 开发的HPLC-MS方法成功地在20分钟内使用同位素化分离了D-和L-5-MTHF二聚体.
- 在1160微克/毫升 (R2>0.99) 的度范围内观察到出色的线性.
- 对101个食补充剂样本的分析显示,其中两个超出了D-5-MTHF的USP限制 (1.39%和50.28%).
结论:
- 经过验证的HPLC-MS方法提供了一种有效和可靠的手段,用于确定复杂的食补充剂配方中的D-和L-5-MTHF比率.
- 这种方法是检测补充剂中,特别是产前维生素中5-MTHF混合物的改的关键工具.
- 与之前报告的二聚体分离技术相比,已确定的方法在速度和选择性方面具有显著的优势.
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