2004
DOI: 10.1016/j.aca.2003.11.085
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Differentiation of proanthocyanidin tannins from seeds, skins and stems of grapes (Vitis vinifera) and heartwood of Quebracho (Schinopsis balansae) by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and thioacidolysis/liquid chromatography/electrospray ionization mass spectrometry

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Cited by 111 publications
(25 citation statements)
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“…Molecular weight of each peak was calculated based on the formula 290 + 288(n − 1) + 23 and 290 + 304(n − 1) + 23. In this equation, 290 indicates the molecular weight of the terminal epicatechin of epicatechin/epicatechin unit, n is the degree of polymerization of epicatechin/epicatechin and epicatechin/epigallocatechin units and 23 is the weight of sodium (Vivas et al , 2004). Similarly, the potassium and lithium adduct formulae were calculated using same equation as above with addition of 38 and 6 as the weights of potassium and lithium as shown in Table 1.…”
Section: Resultsmentioning
confidence: 99%
“…Molecular weight of each peak was calculated based on the formula 290 + 288(n − 1) + 23 and 290 + 304(n − 1) + 23. In this equation, 290 indicates the molecular weight of the terminal epicatechin of epicatechin/epicatechin unit, n is the degree of polymerization of epicatechin/epicatechin and epicatechin/epigallocatechin units and 23 is the weight of sodium (Vivas et al , 2004). Similarly, the potassium and lithium adduct formulae were calculated using same equation as above with addition of 38 and 6 as the weights of potassium and lithium as shown in Table 1.…”
Section: Resultsmentioning
confidence: 99%
“…With the aim of a qualitative characterisation of these compounds in J. macrantha methanolic extract, Sample B obtained by the column chromatography separation step, was injected directly in the ESI-MS source. For the analysis of these compounds negative ionisation was preferred, expecting for each compound a pseudomolecular ion [M−H] − and unimportant fragmentation, on the basis of several reports from literature [21][22][23]. Fig.…”
Section: Esi-ms Of Oligomeric Proanthocyanidins In J Macrantha Extractmentioning
confidence: 99%
“…Laboratories currently characterize the tannin fraction of samples by determining aDP . The aDP is defined, after the chemical depolymerization of the tannins, as Total subunitsTerminal subunits, and is determined by integration of the extension and terminal unit areas from the UV chromatogram obtained after HPLC analysis (Figure ).…”
Section: Resultsmentioning
confidence: 99%