Novel application of benzoyl chloride derivatization in wine. MS assay developed for 56 amines and phenols in wine. Metabolites in wine compared by varietal and high performance liquid chromatography pdf free download of origin. Differences in 29 of 56 metabolites observed in wine.
Location of origin had larger impact on metabolite profile than varietal. Amine and phenolic metabolites are important contributors to the flavor and health effects of many foods, including wine. Determination of these metabolites often involves UV detection following separation by liquid chromatography. MS provides greater sensitivity and selectivity relative to LC-UV. Isotopically labeled benzoyl chloride was used to prepare internal standards for each metabolite. Nanomolar limits of detection were achieved for all metabolites.
To demonstrate the application of this assay, we compared metabolite profiles from Merlot and Cabernet Sauvignon wines from California and Australia. We found five metabolites which were significantly different when grouped by varietal, while twenty-four were different when grouped by location of production. This shows that the method can identify differences between various wines. Check if you have access through your login credentials or your institution. From left to right: A pumping device generating a gradient of two different solvents- a steel-enforced column and a detector for measuring the absorbance. Schematic representation of an HPLC unit.
Each component in the sample interacts slightly differently with the adsorbent material, causing different flow rates for the different components and leading to the separation of the components as they flow out the column. HPLC relies on pumps to pass a pressurized liquid and a sample mixture through a column filled with adsorbent, leading to the separation of the sample components. The components of the sample mixture are separated from each other due to their different degrees of interaction with the adsorbent particles. Due to the small sample amount separated in analytical HPLC, typical column dimensions are 2.
The schematic of an HPLC instrument typically includes a degasser, sampler, pumps, and a detector. The sampler brings the sample mixture into the mobile phase stream which carries it into the column. The pumps deliver the desired flow and composition of the mobile phase through the column. HPLC instrument and provide data analysis. Most HPLC instruments also have a column oven that allows for adjusting the temperature at which the separation is performed. The retention time measured under particular conditions is an identifying characteristic of a given analyte. Sorbent particles may be hydrophobic or polar in nature.