Direct determination of ethanol and methanol in liquid samples by means of vapor phase-Fourier transform infrared spectroscopy

Garrigues, Jose M; Pérez-Ponce, Amparo; Garrigues, Salvador; Guardia, M. de la

doi:10.1016/s0924-2031(97)00038-6

Cited by 54 publications

(42 citation statements)

References 11 publications

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“…Garrigues et al 201 proposed a FTIR procedure for the direct determination of methanol and ethanol in liquid samples such as alcoholic beverages and eau-deCologne. It is based on vapor generation from small injected volumes of untreated samples into a heated Pyrex glass reactor in which ethanol and methanol are volatilized, at a temperature of 80°C, and introduced into a long-path IR gas cell by means of a N 2 carrier flow.…”

Section: Encyclopedia Of Analyticalmentioning

confidence: 99%

Quantitative Analysis, Infrared

Cadet

Guárdia

2000

Encyclopedia of Analytical Chemistry

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In this article, after reviewing the different mathematical methods used in quantification we will describe and discuss their respective advantages and inconveniences. First of all, different examples of applications of infrared (IR) spectroscopy, used with or without other analytical chemistry methods, will be presented. Some examples of direct quantitative analysis in food analysis will be reviewed: lipids (measurement of unsaturation degrees, lipids determination), carbohydrates, proteins (secondary structures, quantitative analysis). We will also focus on original examples of the use of IR spectroscopy combined with enzymes. Secondly, some examples of Fourier transform infrared (FTIR) analysis coupled with other analytical methods are reviewed in the following fields: FTIR quantification in pharmaceuticals, petroleum, paints and other industrial products and in the fields of health, environment, and trace compounds analysis. Finally, we will discuss the limitations and perspectives of IR spectroscopy for quantitative analysis. It appears that the most significant developments in the field of quantitative analysis will most probably come through progress in chemometrics and flow analysis (FA) (automation).

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Section: Encyclopedia Of Analyticalmentioning

confidence: 99%

Quantitative Analysis, Infrared

Cadet

Guárdia

2000

Encyclopedia of Analytical Chemistry

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“…Currently, the methods for determining the methanol content in wine consist of Fourier-transform infrared spectroscopy, 9 gas chromatography (GC), [10][11][12][13] enzyme-electrode methods, 14,15 high performance liquid chromatography (HPLC), 16 uorimetry, 17 etc. Garrigues et al 9 researched the simultaneous determination of methanol and ethanol amounts in wine.…”

Section: Introductionmentioning

confidence: 99%

Direct automatic determination of the methanol content in red wines based on the temperature effect of the KMnO₄/K₂S₂O₅/fuchsin sodium sulfite reaction system

Gao

2018

RSC Adv.

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The standard method for methanol assay in wine is based on a methanol/KMnO 4 /H 2 C 2 O 4 /fuchsin sodium sulfite (FSS) reaction system. However, it is difficult to control the degree of colour and the temperature of the reaction product in this assay, and its repeatability is also poor due to the generation of CO and CO 2 in the reaction. Therefore, to solve these problems, potassium metabisulfite was selected to replace H 2 C 2 O 4 , and an automatic analysis method was developed which can realize rapid and accurate determination of methanol and can be used to make an online analyzer. It was discovered that the reactions of methanol/ KMnO 4 and acetaldehyde/FSS are exothermic, while the reactions of methanol/KMnO 4 and formaldehyde/FSS are endothermic. Consequently, based on the temperature effect, not only was the interference of ethanol eliminated in detecting methanol in wines, the purpose of the research was achieved to directly and accurately determine methanol without sample pretreatment. By optimizing the system, the obtained conditions for determining methanol in wines were as follows: 20 g L , with a 0.6% RSD, 8.8 mg L À1 detection limit and 25 samples per h, and was successfully used for testing representative wine samples. It also obtained better accuracy than previous methods. Due to its superiority in automated operation, reproducibility, analysis speed and test cost, this method and system can serve as a supplementary standard for methanol assay, and for the quality control of the winemaking process and the final wine-product, as well as for low-alcohol drinks.

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“…Some of methods that are currently used for ethanol quantitation include high performance liquid chromatography (HPLC) 1 , gas chromatography (GC) 2,3 , titration 4 , Fourier transform infrared (FTIR) [5][6][7] and colorimetry 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Validation of a modified alcohol dehydrogenase assay for ethanol determination

Ishmayana¹,

Fadhlillah²,

Kristia³

et al. 2015

10.5267/j.ccl

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Enzymatic assay, based on oxidation-reduction reaction catalyzed by alcohol dehydrogenase, is one of the methods used to determine ethanol concentration. The present study was directed to determine the exact amount of enzyme required to accomplish oxidation-reduction reaction so that the concentration of ethanol in the sample can be determined precisely and accurately. Results of the present study indicate that the lowest unit activity of the enzyme that can be used for ethanol determination is 4000 units/mL, even though longer incubation time compared to the original method was used to ensure reaction completion. Validation of the method confirmed that the assay have acceptable linearity range within 0.01 -0.06% (v/v) of ethanol with correlation coefficient of 0.9999. Both accuracy and precision parameters fulfill the Association of Analytical Communities (AOAC) International requirement, and therefore can be accepted as a quantitative analysis method. Limit of detection and limit of quantitation for the modified method were 0.0017% (v/v) and 0.0056% (v/v), respectively.

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Direct determination of ethanol and methanol in liquid samples by means of vapor phase-Fourier transform infrared spectroscopy

Cited by 54 publications

References 11 publications

Quantitative Analysis, Infrared

Quantitative Analysis, Infrared

Direct automatic determination of the methanol content in red wines based on the temperature effect of the KMnO₄/K₂S₂O₅/fuchsin sodium sulfite reaction system

Validation of a modified alcohol dehydrogenase assay for ethanol determination

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Direct determination of ethanol and methanol in liquid samples by means of vapor phase-Fourier transform infrared spectroscopy

Cited by 54 publications

References 11 publications

Quantitative Analysis, Infrared

Quantitative Analysis, Infrared

Direct automatic determination of the methanol content in red wines based on the temperature effect of the KMnO4/K2S2O5/fuchsin sodium sulfite reaction system

Validation of a modified alcohol dehydrogenase assay for ethanol determination

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Direct automatic determination of the methanol content in red wines based on the temperature effect of the KMnO₄/K₂S₂O₅/fuchsin sodium sulfite reaction system