Resveratrol (3,5,4'-trihydroxystilbene) is a natural phenolic compound, which belongs to phytoalexins. It is an antioxidant that exists as both trans and cis isomers and in the glycoside forms (3,5,4'-trihydroxystilbene-3-beta-mono-D-glucoside), which are known as piceid or polydatin. Recently, it has been assumed that resveratrol could be one of the active substances contributing to the health benefits, namely it decreases the risk of cardiovascular diseases through a reasonable consumption of red wine. Grapes, grape juice and especially red wine represent its main source in human diet. The health significance of resveratrol has spawned numerous methods for its measurement in foods. A reversed-phase high performance liquid chromatography (HPLC) miniaturized method for identification and quantification of cis-, trans-resveratrol and its glucosylated forms has been developed, validated and applied to the analysis of red wines from Latium areas. The HPLC miniaturized system consists, under isocratic conditions, of a C18 narrow-bore column (150 x 2.0 i.d. mm, 5 micronm particle size) with a diode array spectrophotometer (DAD) detector. It allows the determination of these compounds by direct injection, without any sample pre-treatment. The method is sensitive, selective, rapid and reliable
Il resveratrolo (3,5,4'-trihydroxystilbene) è un composto fenolico naturale appartenente alla famiglia delle fitoalessine. E' un antiossidante ed esiste nelle forme isomeriche trans e cis e nelle forme glicate (3,5,4'trihydroxystilbene-3-beta-mono-D-glucoside). Recentemente vi è stato un forte interesse su tali molecole per gli effetti benefici che avrebbero sulla salute umana; infatti è stato accertato che il resveratrolo presenta un'azione antiossidante in grado di ridurre il rischio di malattie cardiovascolari attraverso un moderato consumo di vino rosso. Uva, succo d'uva e vino rosso in particolare ne danno il maggior apporto alla dieta. Sono stati messi a punto diversi metodi per la determinazione di questi composti negli alimenti. E' stato sviluppato e validato un metodo HPLC a fase inversa miniaturizzato per la identificazione e determinazione quantitativa delle forme cis- e trans-resveratrolo e delle forme glicate e utilizzato per l'analisi di vini rossi del Lazio. Il metodo consiste in un sistema miniaturizzato HPLC isocratico che utilizza una colonna C18 narrow-bore (150 x 2,0 mm d.i., 5 micronm) con un rivelatore spettrofotometrico a diode array (DAD). I composti sono stati determinati attraverso iniezione diretta del campione, senza pretrattamento. Il metodo è sensibile, selettivo, rapido e affidabile
Evaluation of level of cis- and trans- resveratrol and their glucosides in red wines produced in Lazio Region (Area)
Isabella Nicoletti;
2004
Abstract
Resveratrol (3,5,4'-trihydroxystilbene) is a natural phenolic compound, which belongs to phytoalexins. It is an antioxidant that exists as both trans and cis isomers and in the glycoside forms (3,5,4'-trihydroxystilbene-3-beta-mono-D-glucoside), which are known as piceid or polydatin. Recently, it has been assumed that resveratrol could be one of the active substances contributing to the health benefits, namely it decreases the risk of cardiovascular diseases through a reasonable consumption of red wine. Grapes, grape juice and especially red wine represent its main source in human diet. The health significance of resveratrol has spawned numerous methods for its measurement in foods. A reversed-phase high performance liquid chromatography (HPLC) miniaturized method for identification and quantification of cis-, trans-resveratrol and its glucosylated forms has been developed, validated and applied to the analysis of red wines from Latium areas. The HPLC miniaturized system consists, under isocratic conditions, of a C18 narrow-bore column (150 x 2.0 i.d. mm, 5 micronm particle size) with a diode array spectrophotometer (DAD) detector. It allows the determination of these compounds by direct injection, without any sample pre-treatment. The method is sensitive, selective, rapid and reliableI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


