Strategy for copper speciation in white wine by differential pulse anodic stripping voltammetry, potentiometry with an ion-selective electrode and kinetic photometric determination

Wiese, C.; Schwedt, Georg

doi:10.1007/s002160050497

Cited by 55 publications

(42 citation statements)

References 1 publication

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“…Vasconcelos et al have electrochemically monitored the complexation of Pb [28] and Cu [29] in selected red wines at pH 3.5. Cu determination and its speciation in white wines has also been done by electrochemical means [30,31].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and theoretical complexation studies for Zn and Cu with individual polyphenols

Esparza

Salinas

Santamaría

et al. 2005

Analytica Chimica Acta

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Zn and Cu interactions with three selected flavonoids (catechin, quercetin and rutin) have been electrochemically monitored. It has been shown that catechin takes 1 atom of metal per molecule; quercetin takes 2 atoms, and rutin is able to take up to 3 atoms. Not all ligands bind metals equally strong, and weakly bonded metals can be distinguished. Zn shows a sluggish kinetics and, at the same time, the highest conditional formation constants. The method could be applied to a real sample. Theoretical models are proposed for the most favourable compounds.

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Section: Introductionmentioning

confidence: 99%

Electrochemical and theoretical complexation studies for Zn and Cu with individual polyphenols

Esparza

Salinas

Santamaría

et al. 2005

Analytica Chimica Acta

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“…These results, however, are surprising since elements such as B, Ca or Cu are assumed to form complexes with carboxylic acids, tannins or polysaccharides [1]. Moreover, Wiese and Schwedt [3] who analysed white wines by DPASV found that 33 to 86% of the total copper (depending of the wine) is bounded in complexes and, therefore, electrochemically inert.…”

Section: Metals and Their Distribution In White Winesmentioning

confidence: 99%

“…By using size-exclusion chromatography coupled to ICP-MS, Szpunar et al [2] concluded that lead was almost completely bound to polysaccharides (10 kDa) in wine. Wiese and Schwedt [3] studied copper species in German white wines by differential pulse anodic stripping voltammetry (DPASV), potentiometry with an ion-selective electrode, kinetic photometric determination, and flame atomic absorption spectrometry (FAAS). Applying stripping potentiometry, Green et al [4] could determine free and total copper and lead in wine.…”

Section: Introductionmentioning

confidence: 99%

Size fractionation of non-volatile dissolved organic compounds and metal species in German white wines by combining on-line tangential-flow multistage ultrafiltration, a home-built carbon analyser, and inductively coupled plasma mass spectrometry

et al. 2003

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Organic metal species and their size fractions in three German white wines were characterized by combining multistage ultrafiltration (MST-UF), determination of non-volatile dissolved organic carbon (NV-DOC) by a home-built carbon analyser, and metal quantification by inductively coupled plasma mass spectrometry (ICP-MS). First, NV-DOC and metal species in selected "dry" German white wines were fractionated on-line using MST-UF in the size range of >100 kDa to <1 kDa. For this purpose a 20 mL sample of the wine under study diluted 1:10 with high-purity water was processed through a cascade system of hydrophilized polyethersulfone-based flat membranes of decreasing cut-off (100, 50, 10, 5, and 3 kDa). An aliquot of the fraction <3 kDa was additionally processed through a commercial UF tube (MidGee system, cut-off: 1 kDa) to obtain low-molecular size fractions also. A home-built carbon analyser was applied to determine NV-DOC in the wines and their size fractions. The NV-DOC found in a German reference wine and its size fractions was as follows: total NV-DOC: 8.97 mg mL(-1); F(1) (>100 kDa), 0.15%; F(2) (50-100 kDa), 0.44%; F(3) (10-50 kDa), 0.74%; F(4) (5-10 kDa), 0.76%; F(5) (5-3 kDa), 0.7%; F*(6) (3-1 kDa), 0.9%; F(7) (<1 kDa), 81.6% (related to total NV-DOC). The NV-DOC recovery was 85.2%. Accordingly, most of the NV-DOC in this wine consists of low-molecular mass organic compounds of <1 kDa, presumably carboxylic acids as typical in wine. Parallel metal determinations in these wines and their fractions were performed by ICP-MS. The measurements showed that the major part of the metals investigated, up to 25 elements, were dissolved in the size fraction of <1 kDa except Ba, Sr and Pb which appeared also in other fractions. In addition, conventional UV-VIS spectroscopy was applied to characterise the studied wines and their size fractions. According to this, the UV absorbance between 254 and 280 nm of these white wines shows a parallel trend to their NV-DOC.

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“…On the other hand, Vasconcelos et al [31] have shown that for red wines, in particular, copper ions are capable of complexing with polyphenolic compounds. Some hazes that occur in white wine are claimed to consist of copper ions bound to protein [4] and there has been some attempt to correlate the labile copper concentration assessed by ASV with the thiol content of the wine [12]. ISE studies have shown that of a variety of wine components investigated, cysteine was found to be the strongest binder of copper [14].…”

Section: Optimization Of Medium Exchange Sp For Labile Copper Measurementioning

confidence: 99%

“…Ion selective electrodes (ISEs) have found a useful place in speciation analysis but are generally limited to samples with relatively high (! 1 Â 10 À6 M) metal ion concentrations [13], and have limited usage for direct determination of copper ions in wine [12,14]. ISEs have been used to determine the complexation capacity of wines for copper [14,15].…”

Section: Introductionmentioning

confidence: 99%

Medium Exchange Stripping Potentiometry for the Measurement of Labile Copper in White Wine

Clark

Scollary

2006

Electroanalysis

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An efficient and effective procedure is described for the determination of the labile copper concentration in untreated white wine using medium exchange stripping potentiometry. Two rinse steps between the enrichment and stripping steps allowed measurement of labile concentration with good repeatability and reproducibility. The fraction of labile copper ranged from 13% to 91%, for 16 white wines, indicating the highly variable copper complexing character of the wine matrix. The methodology was applied to labile copper measurement during the oxidation of white wines.

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Strategy for copper speciation in white wine by differential pulse anodic stripping voltammetry, potentiometry with an ion-selective electrode and kinetic photometric determination

Cited by 55 publications

References 1 publication

Electrochemical and theoretical complexation studies for Zn and Cu with individual polyphenols

Electrochemical and theoretical complexation studies for Zn and Cu with individual polyphenols

Size fractionation of non-volatile dissolved organic compounds and metal species in German white wines by combining on-line tangential-flow multistage ultrafiltration, a home-built carbon analyser, and inductively coupled plasma mass spectrometry

Medium Exchange Stripping Potentiometry for the Measurement of Labile Copper in White Wine

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