Determination of Quercetin, Gallic Acid, Resveratrol, Catechin and Malvidin in Brazilian Wines Elaborated in the Vale do São Francisco Using Liquid–Liquid Extraction Assisted by Ultrasound and GC-MS

Phenolic Compounds and Polyamines in Grape-Derived Beverages

“…The highest contents of cyanidin 3,5-diglucoside and delphinidin 3-O-glucoside were obtained in the wines elaborated from V. vinifera. CSW contains higher malvidin 3-O-glucoside (12.50 mg/L) content compared to the other samples and presented similar values to the Brazilian wines (15.3-3.3 mg/L) (Dias et al, 2013). t-resveratrol was detected in all of the analyzed wines, showing no variation.…”

An integrated carbon entrapped molecularly imprinted polymer (MIP) electrode for voltammetric detection of resveratrol in wine

“…While the detection limits are higher than those reported by LC-UV ($3 mg L À1 ) and GC/MS, the detection limits are low enough for the detection of resveratrol in wines and other beverages. [33][34][35][36][37][38] Notably, this work demonstrates that CEMIP with DPV mode is a valid, rapid, and inexpensive method, and could be employed in lieu of the conventional methods which are lengthy due to the separation and derivatization demands. It is to be noted that for low concentrations of resveratrol, the CEMIP could be employed as a selective preconcentration platform analogous to a solid extraction platform integrated with a working electrode.…”

“…Overall, the results were within the range of commonly observed resveratrol levels in wines using the mainstream techniques. [33][34][35][36][37][38] It must be claried that the wine sample was obtained from an opened bottle, and as such does not necessarily conrm the determined resveratrol concentrations to be the true concentrations in a new unopened wine from this brand.…”

“…32 Rapid methods for the quanti-cation of resveratrol in wines are especially of interest, as current methods of analysis such as HPLC with uorescence, chemiluminescence or UV detection and silyl derivatization in tandem with GC-MS are lengthy. [33][34][35][36][37][38] The resveratrol based CEMIP was prepared by the use of a carbon microsphere core entrapped with polymer from the polymerization of methacrylic acid (MAA) as the monomer, ethylene glycol dimethacrylate (EGDMA) as the crosslinker, resveratrol as the template and acetonitrile as the porogenic solvent. The CEMIP electrode platform performance was compared to that of the conventional carbon MIP composite (CMIPC) electrode, where carbon/MIP polymers/eicosane (binder) are mixed and packed in micropipette tips.…”

Optimization of Vortex-Assisted Dispersive Liquid-Liquid Microextraction for the Simultaneous Quantitation of Eleven Non-Anthocyanin Polyphenols in Commercial Blueberry Using the Multi-Objective Response Surface Methodology and Desirability Function Approach

“…At present, the methods of sample preparation for the determination of polyphenols in food are mainly liquid-liquid extraction (LLE) and solid-phase extraction (SPE) [ 12 , 13 ]. However, LLE and SPE have some inherent disadvantages.…”