The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Ramiro Avidad - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of the colorants tartrazine ponceau 4r and Sunset Yellow FCF in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration
Talanta, 1998Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:Abstract A method is proposed for the simultaneous determination of the colorants tartrazine (TT), Sunset Yellow FCF (SY) and ponceau 4R (PR) in foods. The colorants were fixed in Sephadex DEAE A-25 gel at pH 2.0 and then packed in a 1-mm silica cell. The spectra of the analytes fixed in the solid support were recorded between 400 and 800 nm against a blank and the partial least squares (PLS) multivariate calibration was used to obtain the results. The linear dynamic ranges of the calibration graphs were from 50.0 to 650.0 ng ml−1 for the three colorants and these ranges were taking in account the optimisation of the calibration matrix using the PLS-1 algorithm. The experimental results showed that the optimum number of factors for the calibration matrix was four in all instances and the residual means standard deviation was 5.5267 for SY, 6.3878 for TT and 6.9816 for PR. The square of the correlation coefficients were 0.9977, 0.9978 and 0.9954 for SY, TT and PR respectively. The method was applied to the determination of the colorants in foods and results were compared with those obtained by means of HPLC as reference method. The results obtained can be considered as acceptable in most cases (eight of nine commercial samples). The relative standard deviations ranging between 0.5 and 10.8 for the commercial samples analysed.
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simultaneous determination of the colorants Sunset Yellow FCF and quinoline Yellow by solid phase spectrophotometry using partial least squares multivariate calibration
Analyst, 1997Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, J L Vilchez, Ramiro AvidadAbstract:A method for the simultaneous determination of the colorants Sunset Yellow FCF and Quinoline Yellow using solid-phase spectrophotometry is proposed. The colorants were isolated in Sephadex DEAE A-25 gel at pH 5.0, the gel–colorants system was packed in a 1 mm silica cell and spectra were recorded between 400 and 600 nm against a blank. Statistical results were obtained by partial least squares (PLS) multivariate calibration. The optimized matrix by using the PLS-2 method enables the determination of the colorants in artificial mixtures and commercial soft drinks.
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Determination of colorant matters mixtures in foods by solid-phase spectrophotometry
Analytica Chimica Acta, 1996Co-Authors: F. Capitán, Maria D Fernandez, Ignacio De Orbe, Luis Fermín Capitán-vallvey, Ramiro AvidadAbstract:Abstract A new, simple, sensitive and inexpensive method for simultaneous determination of Sunset Yellow FCF (SY), Quinoline Yellow and their respective unsulphonated products (Sudan I (SUD) and Quinoline Yellow Spirit Soluble (QYSS)) in mixtures is proposed. Sunset Yellow and Quinoline Yellow were selectively fixed in Sephadex DEAE A-25 gel (pH 5.0) and SUD and QYSS were selectively fixed in C 18 silica gel (pH 5.0) and the absorbances of both systems were measured directly in solid-phase. The applicable concentration ranges were from 3.0 to 500.0 ng ml −1 for Quinoline Yellow Water Soluble (QYWS), from 3.0 to 200.0 ng ml −1 for QYSS, from 15.0 to 500.0 ng ml −1 for SY and from 20.0 to 200.0 ng ml −1 for SUD. The method was applied to the determination of these compounds in soft drinks, fruit liqueurs and ice creams.
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simultaneous determination of Sunset Yellow FCF and sudan i by solid phase spectrophotometry
Analyst, 1995Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:A new, sensitive and simple spectrophotometric method for the simultaneous determination of Sunset Yellow FCF and Sudan I in mixtures is proposed. The method is based on the isolation of Sunset Yellow FCF on Sephadex diethylaminoethyl (DEAE) A-25 gel (pH 5.0) and the isolation of the Sudan I on C18silica gel (pH 5.0) measuring, directly, their absorbances in the solid phase at λ= 487 nm in both cases. The concentration ranges applicable were between 15 and 500 ng ml–1 for Sunset Yellow FCF and between 20 and 200 ng ml–1 for Sudan I with detection limits of 3.5 and 4.4 ng ml–1, respectively. The method was applied to the determination of mixtures of both compounds in synthetic colourings used as additives in food, drugs and cosmetic products.
L F Capitanvallvey - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of the colorants tartrazine ponceau 4r and Sunset Yellow FCF in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration
Talanta, 1998Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:Abstract A method is proposed for the simultaneous determination of the colorants tartrazine (TT), Sunset Yellow FCF (SY) and ponceau 4R (PR) in foods. The colorants were fixed in Sephadex DEAE A-25 gel at pH 2.0 and then packed in a 1-mm silica cell. The spectra of the analytes fixed in the solid support were recorded between 400 and 800 nm against a blank and the partial least squares (PLS) multivariate calibration was used to obtain the results. The linear dynamic ranges of the calibration graphs were from 50.0 to 650.0 ng ml−1 for the three colorants and these ranges were taking in account the optimisation of the calibration matrix using the PLS-1 algorithm. The experimental results showed that the optimum number of factors for the calibration matrix was four in all instances and the residual means standard deviation was 5.5267 for SY, 6.3878 for TT and 6.9816 for PR. The square of the correlation coefficients were 0.9977, 0.9978 and 0.9954 for SY, TT and PR respectively. The method was applied to the determination of the colorants in foods and results were compared with those obtained by means of HPLC as reference method. The results obtained can be considered as acceptable in most cases (eight of nine commercial samples). The relative standard deviations ranging between 0.5 and 10.8 for the commercial samples analysed.
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simultaneous determination of the colorants Sunset Yellow FCF and quinoline Yellow by solid phase spectrophotometry using partial least squares multivariate calibration
Analyst, 1997Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, J L Vilchez, Ramiro AvidadAbstract:A method for the simultaneous determination of the colorants Sunset Yellow FCF and Quinoline Yellow using solid-phase spectrophotometry is proposed. The colorants were isolated in Sephadex DEAE A-25 gel at pH 5.0, the gel–colorants system was packed in a 1 mm silica cell and spectra were recorded between 400 and 600 nm against a blank. Statistical results were obtained by partial least squares (PLS) multivariate calibration. The optimized matrix by using the PLS-2 method enables the determination of the colorants in artificial mixtures and commercial soft drinks.
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simultaneous determination of Sunset Yellow FCF and sudan i by solid phase spectrophotometry
Analyst, 1995Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:A new, sensitive and simple spectrophotometric method for the simultaneous determination of Sunset Yellow FCF and Sudan I in mixtures is proposed. The method is based on the isolation of Sunset Yellow FCF on Sephadex diethylaminoethyl (DEAE) A-25 gel (pH 5.0) and the isolation of the Sudan I on C18silica gel (pH 5.0) measuring, directly, their absorbances in the solid phase at λ= 487 nm in both cases. The concentration ranges applicable were between 15 and 500 ng ml–1 for Sunset Yellow FCF and between 20 and 200 ng ml–1 for Sudan I with detection limits of 3.5 and 4.4 ng ml–1, respectively. The method was applied to the determination of mixtures of both compounds in synthetic colourings used as additives in food, drugs and cosmetic products.
Maria D Fernandez - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of the colorants tartrazine ponceau 4r and Sunset Yellow FCF in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration
Talanta, 1998Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:Abstract A method is proposed for the simultaneous determination of the colorants tartrazine (TT), Sunset Yellow FCF (SY) and ponceau 4R (PR) in foods. The colorants were fixed in Sephadex DEAE A-25 gel at pH 2.0 and then packed in a 1-mm silica cell. The spectra of the analytes fixed in the solid support were recorded between 400 and 800 nm against a blank and the partial least squares (PLS) multivariate calibration was used to obtain the results. The linear dynamic ranges of the calibration graphs were from 50.0 to 650.0 ng ml−1 for the three colorants and these ranges were taking in account the optimisation of the calibration matrix using the PLS-1 algorithm. The experimental results showed that the optimum number of factors for the calibration matrix was four in all instances and the residual means standard deviation was 5.5267 for SY, 6.3878 for TT and 6.9816 for PR. The square of the correlation coefficients were 0.9977, 0.9978 and 0.9954 for SY, TT and PR respectively. The method was applied to the determination of the colorants in foods and results were compared with those obtained by means of HPLC as reference method. The results obtained can be considered as acceptable in most cases (eight of nine commercial samples). The relative standard deviations ranging between 0.5 and 10.8 for the commercial samples analysed.
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simultaneous determination of the colorants Sunset Yellow FCF and quinoline Yellow by solid phase spectrophotometry using partial least squares multivariate calibration
Analyst, 1997Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, J L Vilchez, Ramiro AvidadAbstract:A method for the simultaneous determination of the colorants Sunset Yellow FCF and Quinoline Yellow using solid-phase spectrophotometry is proposed. The colorants were isolated in Sephadex DEAE A-25 gel at pH 5.0, the gel–colorants system was packed in a 1 mm silica cell and spectra were recorded between 400 and 600 nm against a blank. Statistical results were obtained by partial least squares (PLS) multivariate calibration. The optimized matrix by using the PLS-2 method enables the determination of the colorants in artificial mixtures and commercial soft drinks.
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Determination of colorant matters mixtures in foods by solid-phase spectrophotometry
Analytica Chimica Acta, 1996Co-Authors: F. Capitán, Maria D Fernandez, Ignacio De Orbe, Luis Fermín Capitán-vallvey, Ramiro AvidadAbstract:Abstract A new, simple, sensitive and inexpensive method for simultaneous determination of Sunset Yellow FCF (SY), Quinoline Yellow and their respective unsulphonated products (Sudan I (SUD) and Quinoline Yellow Spirit Soluble (QYSS)) in mixtures is proposed. Sunset Yellow and Quinoline Yellow were selectively fixed in Sephadex DEAE A-25 gel (pH 5.0) and SUD and QYSS were selectively fixed in C 18 silica gel (pH 5.0) and the absorbances of both systems were measured directly in solid-phase. The applicable concentration ranges were from 3.0 to 500.0 ng ml −1 for Quinoline Yellow Water Soluble (QYWS), from 3.0 to 200.0 ng ml −1 for QYSS, from 15.0 to 500.0 ng ml −1 for SY and from 20.0 to 200.0 ng ml −1 for SUD. The method was applied to the determination of these compounds in soft drinks, fruit liqueurs and ice creams.
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simultaneous determination of Sunset Yellow FCF and sudan i by solid phase spectrophotometry
Analyst, 1995Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:A new, sensitive and simple spectrophotometric method for the simultaneous determination of Sunset Yellow FCF and Sudan I in mixtures is proposed. The method is based on the isolation of Sunset Yellow FCF on Sephadex diethylaminoethyl (DEAE) A-25 gel (pH 5.0) and the isolation of the Sudan I on C18silica gel (pH 5.0) measuring, directly, their absorbances in the solid phase at λ= 487 nm in both cases. The concentration ranges applicable were between 15 and 500 ng ml–1 for Sunset Yellow FCF and between 20 and 200 ng ml–1 for Sudan I with detection limits of 3.5 and 4.4 ng ml–1, respectively. The method was applied to the determination of mixtures of both compounds in synthetic colourings used as additives in food, drugs and cosmetic products.
Ignacio De Orbe - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of the colorants tartrazine ponceau 4r and Sunset Yellow FCF in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration
Talanta, 1998Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:Abstract A method is proposed for the simultaneous determination of the colorants tartrazine (TT), Sunset Yellow FCF (SY) and ponceau 4R (PR) in foods. The colorants were fixed in Sephadex DEAE A-25 gel at pH 2.0 and then packed in a 1-mm silica cell. The spectra of the analytes fixed in the solid support were recorded between 400 and 800 nm against a blank and the partial least squares (PLS) multivariate calibration was used to obtain the results. The linear dynamic ranges of the calibration graphs were from 50.0 to 650.0 ng ml−1 for the three colorants and these ranges were taking in account the optimisation of the calibration matrix using the PLS-1 algorithm. The experimental results showed that the optimum number of factors for the calibration matrix was four in all instances and the residual means standard deviation was 5.5267 for SY, 6.3878 for TT and 6.9816 for PR. The square of the correlation coefficients were 0.9977, 0.9978 and 0.9954 for SY, TT and PR respectively. The method was applied to the determination of the colorants in foods and results were compared with those obtained by means of HPLC as reference method. The results obtained can be considered as acceptable in most cases (eight of nine commercial samples). The relative standard deviations ranging between 0.5 and 10.8 for the commercial samples analysed.
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simultaneous determination of the colorants Sunset Yellow FCF and quinoline Yellow by solid phase spectrophotometry using partial least squares multivariate calibration
Analyst, 1997Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, J L Vilchez, Ramiro AvidadAbstract:A method for the simultaneous determination of the colorants Sunset Yellow FCF and Quinoline Yellow using solid-phase spectrophotometry is proposed. The colorants were isolated in Sephadex DEAE A-25 gel at pH 5.0, the gel–colorants system was packed in a 1 mm silica cell and spectra were recorded between 400 and 600 nm against a blank. Statistical results were obtained by partial least squares (PLS) multivariate calibration. The optimized matrix by using the PLS-2 method enables the determination of the colorants in artificial mixtures and commercial soft drinks.
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Determination of colorant matters mixtures in foods by solid-phase spectrophotometry
Analytica Chimica Acta, 1996Co-Authors: F. Capitán, Maria D Fernandez, Ignacio De Orbe, Luis Fermín Capitán-vallvey, Ramiro AvidadAbstract:Abstract A new, simple, sensitive and inexpensive method for simultaneous determination of Sunset Yellow FCF (SY), Quinoline Yellow and their respective unsulphonated products (Sudan I (SUD) and Quinoline Yellow Spirit Soluble (QYSS)) in mixtures is proposed. Sunset Yellow and Quinoline Yellow were selectively fixed in Sephadex DEAE A-25 gel (pH 5.0) and SUD and QYSS were selectively fixed in C 18 silica gel (pH 5.0) and the absorbances of both systems were measured directly in solid-phase. The applicable concentration ranges were from 3.0 to 500.0 ng ml −1 for Quinoline Yellow Water Soluble (QYWS), from 3.0 to 200.0 ng ml −1 for QYSS, from 15.0 to 500.0 ng ml −1 for SY and from 20.0 to 200.0 ng ml −1 for SUD. The method was applied to the determination of these compounds in soft drinks, fruit liqueurs and ice creams.
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simultaneous determination of Sunset Yellow FCF and sudan i by solid phase spectrophotometry
Analyst, 1995Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:A new, sensitive and simple spectrophotometric method for the simultaneous determination of Sunset Yellow FCF and Sudan I in mixtures is proposed. The method is based on the isolation of Sunset Yellow FCF on Sephadex diethylaminoethyl (DEAE) A-25 gel (pH 5.0) and the isolation of the Sudan I on C18silica gel (pH 5.0) measuring, directly, their absorbances in the solid phase at λ= 487 nm in both cases. The concentration ranges applicable were between 15 and 500 ng ml–1 for Sunset Yellow FCF and between 20 and 200 ng ml–1 for Sudan I with detection limits of 3.5 and 4.4 ng ml–1, respectively. The method was applied to the determination of mixtures of both compounds in synthetic colourings used as additives in food, drugs and cosmetic products.
Naglaa M Zidan - One of the best experts on this subject based on the ideXlab platform.
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electro fenton oxidation of Sunset Yellow FCF azo dye in aqueous solutions
Desalination, 2011Co-Authors: M M Ghoneim, Hanaa S Eldesoky, Naglaa M ZidanAbstract:Abstract This study was designed to investigate the oxidation (decolorization/degradation) of Sunset Yellow FCF azo-dye (which is largely used as colorant in common foods and drugs industries) in aqueous solutions with electro-generated Fenton's reagent (H2O2/Fe2+). This has been carried out at room temperature in an undivided electrochemical reactor of a RVC cathode and a platinum gauze anode. The progress of oxidation of Sunset Yellow FCF azo-dye by electro-generated Fenton's reagent has been monitored by UV–visible absorption, chemical oxygen demand (COD) and HPLC measurements. The results obtained under the optimal operational parameters (0.05 M Na2SO4 aqueous solution of pH 3 containing 0.1 mM FeSO4 while controlling the RVC cathode applied potential at − 1.0 V vs. SCE) showed that complete decolorization (100%) and significant mineralization (approximately 97%) of Sunset Yellow FCF azo-dye have been achieved by electro-Fenton oxidation for 120 min. The rate of the oxidation reaction of Sunset Yellow FCF azo-dye in aqueous solution by electro-generated Fenton's reagent has been found to fit to pseudo first-order kinetics.
