Determination of Water Content in Bioethanol Using the 1 H NMR Chemical Shift Change

Yoon, Jeongbin; Yun, Suyeon; Kim, Byungjoo; Ahn, Sangdoo; Choi, Kihwan

doi:10.1002/bkcs.11692

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Determination of Water Content in Bioethanol Using the 1 H NMR Chemical Shift Change

Yoon, Jeongbin;
Yun, Suyeon;
Kim, Byungjoo;
Ahn, Sangdoo;
Choi, Kihwan

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7

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6

초록

Chemical shift change in 1 H NMR spectroscopy was used to determine water content in bioethanol. As water content in ethanol is increased, the proton peaks shifted to down-field due to the change in the microstructure of the water-ethanol mixture. The linear correlation between water content and chemical shift change enables the evaluation of water content in bioethanol. Because the same relationship between chemical shift change and the water content is obtained for both ethanol and bioethanol, water content in bioethanol can be determined using the calibration curve obtained with anhydrous ethanol. The developed method was validated by comparison to the results of Karl Fischer titration and was applied to commercially available bioethanols. © 2019 Korean Chemical Society, Seoul & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

키워드

1 H NMR; Bioethanol; Chemical shift; qNMR; Water content; Bioethanol; Ethanol; Nuclear magnetic resonance spectroscopy; Water content; 1H NMR spectroscopy; Anhydrous ethanol; Calibration curves; Karl Fischer Titration; Linear correlation; NMR chemical shifts; qNMR; Water ethanol mixtures; Chemical shift

제목: Determination of Water Content in Bioethanol Using the 1 H NMR Chemical Shift Change

저자: Yoon, Jeongbin; Yun, Suyeon; Kim, Byungjoo; Ahn, Sangdoo; Choi, Kihwan

DOI: 10.1002/bkcs.11692

발행일: 2019-04

유형: Article

저널명: Bulletin of the Korean Chemical Society

권: 40

호: 4

페이지: 313 ~ 316

언어: ENG

출판사: Wiley Blackwell

발행국가: 대한민국

분량: 4 페이지

ISSN: E 1229-5949
P 0253-2964