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Title: A new alternative assay for sensitive analysis of ethylenethiourea and propylenethiourea in fruit samples after their separation
Authors: Nantaphol S.
Moonla C.
Promvichai S.
Tangkuaram T.
Chailapakul O.
Siangproh W.
Keywords: Catalytic oxidation
High performance liquid chromatography
High pressure liquid chromatography
Screen printing
Chromatographic separations
Cobalt phthalocyanine
Phosphate buffer solutions
Propylenethiourea (PTU)
Relative standard deviations
Screen printing technique
Screen-printed carbon electrodes
Ultra high performance liquid chromatography (UHPLC)
Issue Date: 2020
Abstract: Ultra-high-performance liquid chromatography (UHPLC) coupled with a cobalt phthalocyanine screen-printed carbon electrode (CoPc-SPCE) was developed and validated for quantitative analysis of ethylenethiourea (ETU) and propylenethiourea (PTU). CoPC-SPCE provided high catalytic properties for ETU and PTU oxidation. This fabricated electrode is inexpensive, disposable, and easy to prepare by an in-house screen-printing technique. The chromatographic separation was performed in isocratic mode on a reversed phase C18 (100 mm × 4.6 mm, 3 µm) column, using a 90?:?10 (v/v) ratio of 0.05 M phosphate buffer solution (pH 4) and methanol as the mobile phase with a flow rate of 1.0 mL min-1 at an oxidation potential of +0.7 V vs. Ag/AgCl. The separation could be achieved within 3 min, and a wide linear range of 0.01-100 µg mL-1 (r2 > 0.99) was obtained for both analytes. The limits of detection (3 S/N) were found to be 0.006 and 0.009 µg mL-1 for ETU and PTU, respectively. Furthermore, this proposed method was utilized to determine ETU and PTU in fruit samples with satisfactory results, yielding excellent intra-day and inter-day relative standard deviations and recoveries. These results demonstrated that the proposed assay can be used as a new alternative way for inexpensive, rapid, selective and sensitive determination of ETU and PTU in fruit samples. © The Royal Society of Chemistry.
ISSN: 17599660
Appears in Collections:Scopus 1983-2021

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