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• W2012037810 abstract "The capabilities of spectrophotometric and electrochemical detection techniques were investigated for the high-performance liquid chromatographic determination of flavonoids. Liquid chromatographic analyses were performed on eleven compounds belonging to three different classes of flavonoids: flavanone glycosides, flavone and flavonol aglycones. Separation of all compounds examined was carried out under reversed-phase conditions on a C18 narrow-bore column for UV detection, whereas for electrochemical detection, a C18 standard-bore column was used. UV analyses were carried out at 280 nm for flavanones and at 265 nm for flavones and flavonols, whereas controlled-potential coulometric measurements were performed using a porous graphite electrode. Analytical performances of the methods were compared in terms of linearity, limits of detection (LODs) and precision. Linearity over two orders of magnitude and LODs at low-ppm levels (0.06-1 mg/l) were demonstrated for all techniques considered. Instrumental precision in terms of relative standard deviation was found to be between 0 and 5% for the liquid chromatography (LC)-UV system and between 0.6 and 10% for the LC-electrochemical detection (ED) system. The methods developed were applied to the analysis of flavanones and flavonols in a real sample, such as an extract of orange juice. Even though quercetin glycoside is mostly present in orange juice as rutin, other different glycosides of this flavonol could be present; on this basis, the hydrolysis of all glycosides to aglycone allows one to obtain more accurate data on the flavonol concentration in orange juice. To avoid sample degradation and to increase extraction efficiency, quercetin hydrolysis was optimized using a central composite design to investigate the effects of acid concentration and hydrolysis time on extraction recovery." @default.
• W2012037810 created "2016-06-24" @default.
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• W2012037810 date "2000-06-01" @default.
• W2012037810 modified "2023-10-03" @default.
• W2012037810 title "Spectrophotometric and coulometric detection in the high-performance liquid chromatography of flavonoids and optimization of sample treatment for the determination of quercetin in orange juice" @default.
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• W2012037810 doi "https://doi.org/10.1016/s0021-9673(00)00256-9" @default.
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