Diana Cosovanu1, Montserrat Llovera2, Gemma Villorbina1, Ramon Canela-Garayoa1, Jordi Eras3. 1. Department of Chemistry, DBA Center, ETSEA, University of Lleida, 25003, Lleida, Spain. 2. Scientific Technical Service TCEM, University of Lleida, 25003, Lleida, Spain. 3. Department of Chemistry, DBA Center, ETSEA, University of Lleida, 25003, Lleida, Spain. jordi.eras@udl.cat.
Abstract
INTRODUCTION: The metabolomic profile is an essential tool for understanding the physiological processes of biological samples and their changes. In addition, it makes it possible to find new substances with industrial applications or use as drugs. As GC-MS is a very common tool for obtaining the metabolomic profile, a simple and fast method for sample preparation is required. OBJECTIVES: The aim of this research was to develop a direct derivatization method for GC-MS to simplify the sample preparation process and apply it to a wide range of samples for non-targeted metabolomic analysis purposes. METHODS: One pot combined esterification of carboxylic acids with methanol and silylation of the hydroxyl groups was achieved using a molar excess of chlorotrimethylsilane with respect to methanol in the presence of pyridine. RESULTS: The metabolome profile obtained from different samples, such as bilberry and cherry cuticles, olive leaves, P. aeruginosa and E. coli bacteria, A. niger fungi and human sebum from the ceruminous gland, shows that the procedure allows the identification of a wide variety of metabolites. Aliphatic fatty acids, hydroxyfatty acids, phenolic and other aromatic compounds, fatty alcohols, fatty aldehydes dimethylacetals, hydrocarbons, terpenoids, sterols and carbohydrates were identified at different MSI levels using their mass spectra. CONCLUSION: The metabolomic profile of different biological samples can be easily obtained by GC-MS using an efficient simultaneous esterification-silylation reaction. The derivatization method can be carried out in a short time in the same injection vial with a small amount of reagents.
INTRODUCTION: The metabolomic profile is an essential tool for understanding the physiological processes of biological samples and their changes. In addition, it makes it possible to find new substances with industrial applications or use as drugs. As GC-MS is a very common tool for obtaining the metabolomic profile, a simple and fast method for sample preparation is required. OBJECTIVES: The aim of this research was to develop a direct derivatization method for GC-MS to simplify the sample preparation process and apply it to a wide range of samples for non-targeted metabolomic analysis purposes. METHODS: One pot combined esterification of carboxylic acids with methanol and silylation of the hydroxyl groups was achieved using a molar excess of chlorotrimethylsilane with respect to methanol in the presence of pyridine. RESULTS: The metabolome profile obtained from different samples, such as bilberry and cherry cuticles, olive leaves, P. aeruginosa and E. coli bacteria, A. niger fungi and human sebum from the ceruminous gland, shows that the procedure allows the identification of a wide variety of metabolites. Aliphatic fatty acids, hydroxyfatty acids, phenolic and other aromatic compounds, fatty alcohols, fatty aldehydesdimethylacetals, hydrocarbons, terpenoids, sterols and carbohydrates were identified at different MSI levels using their mass spectra. CONCLUSION: The metabolomic profile of different biological samples can be easily obtained by GC-MS using an efficient simultaneous esterification-silylation reaction. The derivatization method can be carried out in a short time in the same injection vial with a small amount of reagents.
Authors: Qun Gu; Frank David; Frédéric Lynen; Klaus Rumpel; Guowang Xu; Paul De Vos; Pat Sandra Journal: J Chromatogr A Date: 2010-06-25 Impact factor: 4.759
Authors: Michał Brokl; Ana Cristina Soria; Isabel Martínez-Castro; Maria Luz Sanz; Ana Isabel Ruiz-Matute Journal: J Chromatogr A Date: 2009-04-01 Impact factor: 4.759