Method for Simultaneous Determination of Amino Acid Surfactants Sodium N-Lauroylsarcosinate and Sodium Methyl Cocoyl Taurate in Personal Care Products, by Using High Performance Liquid Chromatography

Sodium N-lauroylsarcosinate (NLS) and sodium methyl cocoyl taurate (SMCT) are widely used in sulfate free personal care products. We present a straightforward and highly sensitive High-Performance Liquid Chromatographic (HPLC) method for simultaneous detection and estimation of these substances in commercial personal care products. The HPLC method has a detection limit for NLS of concentrations as low as 1.5 ppm, and that for SMCT of 4.0 ppm, all with a signal-to-noise (S/N) ratio exceeding 3.0. Additionally, the method enables quantification down to 4.5 ppm for NLS, and 12.0 ppm for SMCT, with an S/N ratio surpassing 10.0. This validated method serves as a versatile tool for the accurate quantification of NLS, and SMCT in sulfate free personal care products like shampoos, face washes, body washes, baby shampoos, and toothpastes.