A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone

Cyclic voltammetry (CV) in a pH 7.0 phosphate buffer solution containing aspartame (ASP) and caffeic acid (CAF) was studied. In sharp contrast to untreated electrodes, two distinct redox peaks were observed at preanodized screen-printed carbon electrodes (SPCE*) due to the formation of a homopolymer...

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Những tác giả chính:	Lê, Vũ Trâm Anh, Su, Ya-Ling, Cheng, Shu-Hua
Định dạng:	Journal article
Ngôn ngữ:	English
Được phát hành:	Elsevier 2022
Những chủ đề:	Aspartame Electrochemical polymerization Caffeic acid Differential pulse voltammetry Artificial sweeteners
Truy cập trực tuyến:	http://scholar.dlu.edu.vn/handle/123456789/1544
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id	oai:scholar.dlu.edu.vn:123456789-1544
record_format	dspace
institution	Thư viện Trường Đại học Đà Lạt
collection	Thư viện số
language	English
topic	Aspartame Electrochemical polymerization Caffeic acid Differential pulse voltammetry Artificial sweeteners
spellingShingle	Aspartame Electrochemical polymerization Caffeic acid Differential pulse voltammetry Artificial sweeteners Lê, Vũ Trâm Anh Su, Ya-Ling Cheng, Shu-Hua A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
description	Cyclic voltammetry (CV) in a pH 7.0 phosphate buffer solution containing aspartame (ASP) and caffeic acid (CAF) was studied. In sharp contrast to untreated electrodes, two distinct redox peaks were observed at preanodized screen-printed carbon electrodes (SPCE*) due to the formation of a homopolymer poly(CAF) and a copolymer poly(CAF-ASP). The characteristics of the polymer film-modified electrodes were well-characterized by atomic force microscopy (AFM), photoelectron spectroscopy (XPS) and the water contact angle technique. Electrochemically induced polymerization mechanisms were discussed. Current responses from poly(CAF-ASP) were employed for ASP determination, and a linear dynamic range from 0.05 µM to 10 μM was obtained using differential pulse voltammetry (DPV). The detection limit (S/N = 3) was 0.0076 µM, the quantitation limit (S/N=10) was 0.0256 µM and the sensitivity was 12.067 μA μM-1. Common additives in soft drinks do not interfere with the ASP analysis. The proposed assay and a reference high-performance liquid chromatography (HPLC) were applied for the determination of ASP in two soft drinks using the standard addition method, and satisfactory recoveries and good agreement were obtained.
format	Journal article
author	Lê, Vũ Trâm Anh Su, Ya-Ling Cheng, Shu-Hua
author_facet	Lê, Vũ Trâm Anh Su, Ya-Ling Cheng, Shu-Hua
author_sort	Lê, Vũ Trâm Anh
title	A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
title_short	A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
title_full	A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
title_fullStr	A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
title_full_unstemmed	A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
title_sort	novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone
publisher	Elsevier
publishDate	2022
url	http://scholar.dlu.edu.vn/handle/123456789/1544
_version_	1768306080623886336
spelling	oai:scholar.dlu.edu.vn:123456789-15442022-10-14T14:38:43Z A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone Lê, Vũ Trâm Anh Su, Ya-Ling Cheng, Shu-Hua Aspartame Electrochemical polymerization Caffeic acid Differential pulse voltammetry Artificial sweeteners Cyclic voltammetry (CV) in a pH 7.0 phosphate buffer solution containing aspartame (ASP) and caffeic acid (CAF) was studied. In sharp contrast to untreated electrodes, two distinct redox peaks were observed at preanodized screen-printed carbon electrodes (SPCE*) due to the formation of a homopolymer poly(CAF) and a copolymer poly(CAF-ASP). The characteristics of the polymer film-modified electrodes were well-characterized by atomic force microscopy (AFM), photoelectron spectroscopy (XPS) and the water contact angle technique. Electrochemically induced polymerization mechanisms were discussed. Current responses from poly(CAF-ASP) were employed for ASP determination, and a linear dynamic range from 0.05 µM to 10 μM was obtained using differential pulse voltammetry (DPV). The detection limit (S/N = 3) was 0.0076 µM, the quantitation limit (S/N=10) was 0.0256 µM and the sensitivity was 12.067 μA μM-1. Common additives in soft drinks do not interfere with the ASP analysis. The proposed assay and a reference high-performance liquid chromatography (HPLC) were applied for the determination of ASP in two soft drinks using the standard addition method, and satisfactory recoveries and good agreement were obtained. 300 67-76 2022-10-14T14:38:36Z 2022-10-14T14:38:36Z 2019 Journal article Bài báo đăng trên tạp chí thuộc ISI, bao gồm book chapter http://scholar.dlu.edu.vn/handle/123456789/1544 en Electrochimica Acta [1] K. O’Donnell, M. W. Kearsley, Sweeteners and sugar alternatives in food technology, 2nd Ed. A John Wiley & Sons Ltd. UK, 2012. [2] M. Marimovich, C. L. Galli, C. 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A novel electrochemical assay for aspartame determination via nucleophilic reactions with caffeic acid ortho-quinone

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