Use of mass spectrometry as a tool for the search or identification of flavonoids in Urticaceae

Abstract

The Urticaceae family, circumscribed within the Rosales, was investigated in this study with an overview of the current literature about phytochemical studies using the Liquid Chromatography coupled to Mass Spectrometry (LC-MS) technique. The aim of this study was to review the secondary metabolites identified in the Urticaeae using LC-MS analysis. A systematic review was performed using Scifinder and ScienceDirect databases. Phenolic substances are the most abundant in the Urticaceae family, especially flavones, phenolic acids, and flavonols. We have shown that flavonoids are important chemotaxonomic markers of the chemical composition of the Urticaeae. Following chemical attributes, the C-glycosylated and O-glycosylated flavones stand out as the main skeletons. Our results revealed the chemical profile and structural variability of micromolecules from each genus of Urticaceae. This approach demonstrates a greater use of reversed-phase and liquid chromatography coupled to a mass spectrometer with a negative mode electrospray ionization (ESI) source. In addition, the mobile phase is usually composed of binary systems and eluted by gradient systems. Finally, this paper presents the identification of molecular ion patterns and fragmentation of chemical markers in Urticaceae, identified and isolated using LC-MS, which has been proven to be a valuable tool in several areas, such as phytochemistry, chemosystematics, and chemophenetics. In conclusion, this review is expected to help identify and separate phenolic compounds from the Urticaceae family.

Key words:
chemical profile; fragmentation pattern; LC-MS; phenolic acid; phytochemical