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Application of an activated carbon-based support for magnetic solid phase extraction followed by spectrophotometric determination of tartrazine in commercial beverages.

Rodríguez JA, Escamilla-Lara KA, Guevara-Lara A, Miranda JM, Páez-Hernández ME - Int J Anal Chem (2015)

Bottom Line: The tartrazine eluted from the magnetic support was determined by spectrophotometry.Under optimal conditions, the linear range of the calibration curve ranges from 3 to 30 mg L(-1), with a limit of detection of 1 mg L(-1).A precision of <5.0% was obtained in all cases and no significant differences were observed (P < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Laboratorio 2, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, 42184 Mineral de la Reforma, HGO, Mexico.

ABSTRACT
A method is presented for magnetic solid phase extraction of tartrazine from nonalcoholic beverages. The method involves the extraction and clean-up by activated carbon covered with magnetite dispersed in the sample, followed by the magnetic isolation and desorption of the analyte by basified methanol. The tartrazine eluted from the magnetic support was determined by spectrophotometry. Under optimal conditions, the linear range of the calibration curve ranges from 3 to 30 mg L(-1), with a limit of detection of 1 mg L(-1). The method was validated by comparing the results with those obtained by HPLC. A precision of <5.0% was obtained in all cases and no significant differences were observed (P < 0.05).

No MeSH data available.


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Diffractogram of (a) magnetic modified carbon support and (b) activated carbon.
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fig1: Diffractogram of (a) magnetic modified carbon support and (b) activated carbon.

Mentions: Instrumental techniques were used to provide information about the composition and structure of the magnetic modified carbon. Thus, the X-ray diffraction (XRD) studies were performed in order to determine the iron oxide form present in the solid. The XRD diffractograms from Figure 1(a) show the signals labeled as “m” that correspond to the characteristic diffraction lines of Fe3O4 (2θ = 30.1°, 35.5°, 43.1°, 53.4°, 57.0°, and 62.6°) according to the Joint Committee on Powder Diffraction Standards [24]. The broadband signal observed between 20° and 30° for the 2θ angle (Figure 1(b)) is characteristic of amorphous carbon, the raw material.


Application of an activated carbon-based support for magnetic solid phase extraction followed by spectrophotometric determination of tartrazine in commercial beverages.

Rodríguez JA, Escamilla-Lara KA, Guevara-Lara A, Miranda JM, Páez-Hernández ME - Int J Anal Chem (2015)

Diffractogram of (a) magnetic modified carbon support and (b) activated carbon.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4383302&req=5

fig1: Diffractogram of (a) magnetic modified carbon support and (b) activated carbon.
Mentions: Instrumental techniques were used to provide information about the composition and structure of the magnetic modified carbon. Thus, the X-ray diffraction (XRD) studies were performed in order to determine the iron oxide form present in the solid. The XRD diffractograms from Figure 1(a) show the signals labeled as “m” that correspond to the characteristic diffraction lines of Fe3O4 (2θ = 30.1°, 35.5°, 43.1°, 53.4°, 57.0°, and 62.6°) according to the Joint Committee on Powder Diffraction Standards [24]. The broadband signal observed between 20° and 30° for the 2θ angle (Figure 1(b)) is characteristic of amorphous carbon, the raw material.

Bottom Line: The tartrazine eluted from the magnetic support was determined by spectrophotometry.Under optimal conditions, the linear range of the calibration curve ranges from 3 to 30 mg L(-1), with a limit of detection of 1 mg L(-1).A precision of <5.0% was obtained in all cases and no significant differences were observed (P < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Laboratorio 2, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, 42184 Mineral de la Reforma, HGO, Mexico.

ABSTRACT
A method is presented for magnetic solid phase extraction of tartrazine from nonalcoholic beverages. The method involves the extraction and clean-up by activated carbon covered with magnetite dispersed in the sample, followed by the magnetic isolation and desorption of the analyte by basified methanol. The tartrazine eluted from the magnetic support was determined by spectrophotometry. Under optimal conditions, the linear range of the calibration curve ranges from 3 to 30 mg L(-1), with a limit of detection of 1 mg L(-1). The method was validated by comparing the results with those obtained by HPLC. A precision of <5.0% was obtained in all cases and no significant differences were observed (P < 0.05).

No MeSH data available.


Related in: MedlinePlus