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A study of reaction between quinones and thiourea: determination of thiourea in orange juice

de Oliveira, Adriana N ; de Santana, Henrique ; Zaia, Cássia T.B.V ; Zaia, Dimas A.M

Journal of food composition and analysis, 2004-04, Vol.17 (2), p.165-177 [Periódico revisado por pares]

New York, NY: Elsevier Inc

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Título:
A study of reaction between quinones and thiourea: determination of thiourea in orange juice
Autor: de Oliveira, Adriana N ; de Santana, Henrique ; Zaia, Cássia T.B.V ; Zaia, Dimas A.M
Assuntos: Biological and medical sciences ; Food industries ; Fruit and vegetable industries ; Fundamental and applied biological sciences. Psychology ; General aspects ; Methods of analysis, processing and quality control, regulation, standards ; Orange juice ; Quinones ; Spectrophotometry ; Thiourea
É parte de: Journal of food composition and analysis, 2004-04, Vol.17 (2), p.165-177
Descrição: The study of the reaction between several quinones and thiourea and the determination of a method for determination of thiourea in orange juice were done. After reaction with thiourea (pH 3.0), the UV-Vis spectra showed new bands only for p-benzoquinone (PBQ) (290 nm, 410 nm), 2,5-dichloro- p-benzoquinone (2,5-DC-PBQ) (330 nm, 420 nm) and tetrachloro- p-benzoquinone (TC-PBQ) (255 nm, 320 nm). The results of FT-IR of the reaction of PBQ and 2,5-DC-PBQ/thiourea showed a substitution of the sulfhydryl group on the ring of quinone. The best concentrations of 2,5-DC-PBQ and PBQ, for determination of thiourea, were 5.0 and 10.0 m m, respectively. The products of reaction 2,5-DC-PBQ and PBQ/thiourea were stable in the period of 2 h and 20–120 min after the heating, respectively. The assay of thiourea using 2,5-DC-PBQ was susceptible to interference by iron (III), copper (II) and ascorbic acid. The detection limit for thiourea with PBQ was 0.90 μg/mL. Using filtration method, the recoveries of thiourea with PBQ from the samples were 100%.
Editor: New York, NY: Elsevier Inc
Idioma: Inglês

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A study of reaction between quinones and thiourea: determination of thiourea in orange juice

de Oliveira, Adriana N ; de Santana, Henrique ; Zaia, Cássia T.B.V ; Zaia, Dimas A.M

New York, NY: Elsevier Inc

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