Photodiode array detection for elucidation of the structure of phenolic compounds

Analysis of proanthocyanidins

“…The effect of substituents on the UV spectrum depends more on their position and interaction than on their chemical nature. The ortho and meta positions give bathochromic shifts of the UV maxima at longer wavelengths [109]. In addition, a symmetrical UV spectrum, relating to the maximum at 280 nm, is characteristic for a homogeneous procyanidin polymer [110], whereas symmetry is disturbed in mixed procyanidin-prodelphinidin polymers.…”

Effect of germination on legume phenolic compounds and their antioxidant activity

“…Chromatographic peaks were identified by comparing retention times, UV spectra and data of UV spectral parameters (Bartolome´et al, 1993(Bartolome´et al, , 1996, with those of standards, or those of previously purified and identified procyanidins (Pe´rez-Ilzarbe et al, 1992), recorded in the same chromatographic conditions with the PAD.…”

Bioactive phenolic compounds of cowpeas (Vigna sinensis L). Modifications by fermentation with natural microflora and with Lactobacillus plantarum ATCC 14917

“…Chromatographic peaks were identified by comparison of the retention times, UV spectra and data of UV spectral parameters 28,29 with those of standards. The standards gallic, protocatechuic, phydroxybenzoic, vanillic, trans-p-coumaric and transferulic acids, tyrosol and hydroxymethylfurfuraldehyde were from Aldrich Chimie (Munich, Germany) and the standards quercetin 3-O-galactoside, quercetin 3-O-glucoside and quercetin were from Extrasynthese (Genay, France).…”