Development of a potentiometric procedure for determination of glycerol and 2,3-butanediol in wine by sequential injection analysis

Luca, Gilmara Caseri de; Reis, Boaventura F.; Zagatto, Elias A.G.; Montenegro, M.C.B.S.M.; Araújo, Alberto N.; Lima, José L.F.C.

doi:10.1016/s0003-2670(98)00103-2

Cited by 26 publications

(13 citation statements)

References 13 publications

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“…When the matrix concentration 18 was halved or doubled, positive or negative variations in peak height (about 20%) were observed. It is interesting to report that these variations were not caused by modifications in the ethanol content.…”

Section: Resultsmentioning

confidence: 99%

“…18 The sample carrier stream (R 1 - Figure 1) PO 4 in 100 mL of water, letting it to stand overnight and filtering through a 0.45 µm cellulose membrane. 9 This stock reagent was stable for at least one month if stored at 5 °C.…”

Section: Reagents Standards Samplesmentioning

confidence: 99%

“…Working standard solutions (0.0 -20.0 mg L -1 SO 2 ) were freshly prepared by diluting the above stock with a solution containing the chemical species commonly present as macro-constituents of most of the commercially available wines (wine matrix solution): 0.7 % m/v citric acid, 0.3 % m/v sucrose, 0.2 % m/v glycerol, 0.4 % m/v tartaric acid, 2.2 x 10 -3 mol L -l phosphoric acid and 10 % (v/v) ethanol. 18 The sample carrier stream (R 1 - Figure 1) was a 0.5 mol L -1 citric acid solution. Reagent R 2 was a 0.3 mol L -1 phosphate plus 1.0 x 10 -3 mol L -1 cetylpyridine chloride (CPC) solution that was prepared by dissolving 26.1 g K 2 HPO 4 plus 1.8 g CPC in about 450 mL of water, adjusting the pH to 8.0 ± 0.1 with 0.3 mol L -1 phosphoric acid, and filling the volume up to 500 mL with water.…”

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Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane

Melo¹,

Zagatto²,

Mattos³

et al. 2003

J. Braz. Chem. Soc.

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Um sistema de análises por injeção em fluxo é proposto para a determinação espectrofotométrica de sulfito em vinhos brancos. O método envolve conversão do analito a SO 2 , difusão gasosa através de uma membrana semi-permeável de Teflon ® , coleta em um fluxo alcalino (pH 8), reação com verde de Malaquita (VM) e monitorização a 620 nm. O projeto do sistema foi simplificado empregandose uma membrana tubular concêntrica. Foram investigados: concentrações dos reagentes, pH dos fluxos doador e receptor, intensidade iônica, temperatura, temporização, adição de agentes tensoativos e presença de interferentes em potencial presentes na matriz vinho. A sensibilidade analítica melhorou (ca. 100%) adicionando-se cloreto de cetil piridinio (CPC). O sistema proposto é robusto e deriva em linha base não é observada durante períodos de até 4 horas de operação. São requeridos apenas 400 µL de amostra e 0.32 mg VM por determinação. O sistema processa 30 amostras por hora, fornecendo resultados precisos (d.p.r. < 0.015 para 1.0 -20.0 mg L -1 SO 2 ) e concordantes com os obtidos por um procedimento alternativo.A flow-injection system is proposed for the spectrophotometric determination of sulphite in white wines. The method involves analyte conversion to SO 2 , gas diffusion through a Teflon ® semipermeable membrane, collection into an alkaline stream (pH 8), reaction with Malachite green (MG) and monitoring at 620 nm. With a concentric tubular membrane, the system design was simplified. Influence of reagent concentrations, pH of donor and acceptor streams, temperature, timing, surfactant addition and presence of potential interfering species of the wine matrix were investigated. A pronounced (ca. 100%) enhancement in sensitivity was noted by adding cetylpyridinium chloride (CPC). The proposed system is robust and baseline drift is not observed during 4 h operating periods. Only 400 µL of sample and 0.32 mg MG are required per determination. The system handles 30 samples per hour, yielding precise results (r.s.d. < 0.015 for 1.0 -20.0 mg L -1 SO 2 ) in agreement with those obtained by an alternative procedure.Keywords: concentric tubular membrane, sulfite, spectrophotometric flow analysis, micellar medium, gas diffusion IntroductionGas diffusion is a very effective means to enhance selectivity in analytical chemistry, and was implemented in a flow-injection system in the pioneer work dealing with the development of an improved procedure for determination of total CO 2 in plasma. 1 Since then, the strategy has been often exploited, as it is efficiently accomplished in flow systems. 2,3 Generally, a gaspermeable membrane is placed between two liquid streams, one of them -the donor stream -containing the sample under processing. The analyte is converted to a volatile chemical species that is removed from the sample matrix and collected by other stream -the acceptor stream.Sulphite is an important preservative in the food and beverage industry, especially with regard to wine production 4-8 and its content should be strictly controlle...

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Section: Resultsmentioning

confidence: 99%

Section: Reagents Standards Samplesmentioning

confidence: 99%

mentioning

confidence: 99%

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Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane

Melo¹,

Zagatto²,

Mattos³

et al. 2003

J. Braz. Chem. Soc.

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“…However, because of the latter the detector cell must be miniaturized and therefore the potentiometer electrode had to be down scaled. Down scaling of the electrode was obtained, recently [36], and the SIA system was used for the determination of glycerol and 2,3-butane diol by continuous potentiometric monitoring with the PVC-matrix impregnated membrane electrode [37].…”

Section: Direct Potentiometry Methodsmentioning

confidence: 99%

Periodate oxidation and its contribution to instrumental methods of micro-analysis—A review

Vlessidis

Evmiridis

2009

Analytica Chimica Acta

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“…Secondly, formaldehyde reacts with acetylacetone and ammonia giving the intensively yellow product 2,4-diacetyl-1,4-dihydrolutidine (Hantzsch reaction) [28]. As main benefit of this analytical protocol, quantification of formaldehyde offers a higher selectivity compared to the quantification of the consumed periodate [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of sorbitol in Pichia pastoris cultivation applying sequential injection analysis

Horstkotte

Arnau

Valero

et al. 2008

Biochemical Engineering Journal

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Development of a potentiometric procedure for determination of glycerol and 2,3-butanediol in wine by sequential injection analysis

Cited by 26 publications

References 13 publications

Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane

Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane

Periodate oxidation and its contribution to instrumental methods of micro-analysis—A review

Monitoring of sorbitol in Pichia pastoris cultivation applying sequential injection analysis

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