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Statements

Subject Item
n2:RIV%2F00216208%3A11160%2F14%3A10281833%21RIV15-MSM-11160___
rdf:type
skos:Concept n19:Vysledek
rdfs:seeAlso
http://www.sciencedirect.com/science/article/pii/S0003267014004693
dcterms:description
A novel approach of head-space single-drop micro-extraction applied to the determination of ethanol in wine is presented. For the first time, the syringe of an automated syringe pump was used as an extraction chamber of adaptable size for a volatile analyte. This approach enabled to apply negative pressure during the enrichment step, which favored the evaporation of the analyte. Placing a slowly spinning magnetic stirring bar inside the syringe, effective syringe cleaning as well as mixing of the sample with buffer solution to suppress the interference of acetic acid was achieved. Ethanol determination was based on the reduction of a single drop of 3 mmol L-1 potassium dichromate dissolved in 8 mol L-1 sulfuric acid. The drop was positioned in the syringe inlet in the head-space above the sample with posterior spectrophotometric quantification. The entire procedure was carried out automatically using a simple sequential injection analyzer system. One analysis required less than 5 min including the washing step. A limit of detection of 0.025% (v/v) of ethanol and an average repeatability of less than 5.0% RSD were achieved. The consumption of dichromate reagent, buffer, and sample per analysis were only 20 mu L, 200 mu L, and 1 mL, respectively. The results of real samples analysis did not differ significantly from those obtained with the references gas chromatography method. A novel approach of head-space single-drop micro-extraction applied to the determination of ethanol in wine is presented. For the first time, the syringe of an automated syringe pump was used as an extraction chamber of adaptable size for a volatile analyte. This approach enabled to apply negative pressure during the enrichment step, which favored the evaporation of the analyte. Placing a slowly spinning magnetic stirring bar inside the syringe, effective syringe cleaning as well as mixing of the sample with buffer solution to suppress the interference of acetic acid was achieved. Ethanol determination was based on the reduction of a single drop of 3 mmol L-1 potassium dichromate dissolved in 8 mol L-1 sulfuric acid. The drop was positioned in the syringe inlet in the head-space above the sample with posterior spectrophotometric quantification. The entire procedure was carried out automatically using a simple sequential injection analyzer system. One analysis required less than 5 min including the washing step. A limit of detection of 0.025% (v/v) of ethanol and an average repeatability of less than 5.0% RSD were achieved. The consumption of dichromate reagent, buffer, and sample per analysis were only 20 mu L, 200 mu L, and 1 mL, respectively. The results of real samples analysis did not differ significantly from those obtained with the references gas chromatography method.
dcterms:title
Automated in-syringe single-drop head-space micro-extraction applied to the determination of ethanol in wine samples Automated in-syringe single-drop head-space micro-extraction applied to the determination of ethanol in wine samples
skos:prefLabel
Automated in-syringe single-drop head-space micro-extraction applied to the determination of ethanol in wine samples Automated in-syringe single-drop head-space micro-extraction applied to the determination of ethanol in wine samples
skos:notation
RIV/00216208:11160/14:10281833!RIV15-MSM-11160___
n3:aktivita
n9:S n9:P n9:I
n3:aktivity
I, P(EE2.3.30.0022), S
n3:cisloPeriodika
May
n3:dodaniDat
n16:2015
n3:domaciTvurceVysledku
n12:7664370 n12:3800695 n12:7555350 n12:4710770
n3:druhVysledku
n6:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
4564
n3:idVysledku
RIV/00216208:11160/14:10281833
n3:jazykVysledku
n5:eng
n3:klicovaSlova
Ethanol; Spectrophotometric detection; Single-drop micro-extraction; Head-space; Sequential injection analysis; In-syringe
n3:klicoveSlovo
n4:In-syringe n4:Single-drop%20micro-extraction n4:Spectrophotometric%20detection n4:Ethanol n4:Sequential%20injection%20analysis n4:Head-space
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[C2785869245C]
n3:nazevZdroje
Analytica Chimica Acta
n3:obor
n20:CB
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n7:EE2.3.30.0022
n3:rokUplatneniVysledku
n16:2014
n3:svazekPeriodika
828
n3:tvurceVysledku
Solich, Petr Horstkotte, Burkhard Šrámková, Ivana Sklenářová, Hana
n3:wos
000336336900007
s:issn
0003-2670
s:numberOfPages
8
n17:doi
10.1016/j.aca.2014.04.031
n18:organizacniJednotka
11160