Desenvolvimento de um método de análise de vitamina C em alimentos por cromatografa líquida de alta eficiência e exclusão iônica

Abstract

Vitamin C is an essential nutrient for human physiology. In Brazil, vitamin C supplements are expensive and most of the population obtains vitamin C through its consumption of fruits and vegetables. Therefore, the vitamin C assay in food is crucial in post-harvest studies to conserve and minimize losses of this highly sensitive nutrient. This study proposes a method for analyzing vitamin C by High Performance Liquid Chromatography using a hydrogen type ion exchange column, and demonstrates that it is more efficient than the traditional methods of reverse phase column (C18) for complex matrixes and low levels of this analyte. Chromatograms were baseline resolved and peak purity evaluation showed spectral homogeneity by photo diode array detector. This method was also tested using the best extraction solution to stabilize vitamin C, demonstrating that 0.05 M of superpure sulfuric acid (also the mobile phase) was the most efficient solution for this purpose.