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Manuel Hernández-córdoba - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography–mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL^-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys. Figure USAEME is a useful sample pretreatment procedure for controlling the small amounts of bisphenols released from samples

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography-mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils.
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys.

Pilar Viñas - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography–mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL^-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys. Figure USAEME is a useful sample pretreatment procedure for controlling the small amounts of bisphenols released from samples

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography-mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils.
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys.

Koni Grob - One of the best experts on this subject based on the ideXlab platform.

  • Transfer of bisphenol A from Thermal Printer paper to the skin
    Analytical and Bioanalytical Chemistry, 2010
    Co-Authors: Sandra Biedermann, Patrik Tschudin, Koni Grob
    Abstract:

    Of 13 Thermal printing papers analyzed, 11 contained 8–17 g/kg bisphenol A (BPA). When taking hold of a receipt consisting of Thermal printing paper for 5 s, roughly 1 μg BPA (0.2–6 μg) was transferred to the forefinger and the middle finger if the skin was rather dry and about ten times more if these fingers were wet or very greasy. This amount transferred to dry skin was neither significantly increased when taking hold of the paper at up to 10 sites, nor reduced when BPA-free paper was contacted afterwards. After 60–90 min, BPA applied to the skin as a solution in ethanol was only partially or no longer at all extractable with ethanol, whereas BPA transferred to the skin by holding Thermal Printer paper remained largely extractable after 2 h. This suggests that penetration of the skin depends on the conditions. Extractability experiments did not enable us to conclude whether BPA passes through the skin, but indicated that it can enter the skin to such a depth that it can no longer be washed off. If this BPA ends up in the human metabolism, exposure of a person repeatedly touching Thermal Printer paper for 10 h/day, such as at a cash register, could reach 71 μg/day, which is 42 times less than the present tolerable daily intake (TDI). However, if more than just the finger pads contact the BPA-containing paper or a hand cream enhances permeability of the skin, this margin might be smaller. Figure Thermal Printer paper as used in numerous every-day-applications

  • transfer of bisphenol a from Thermal Printer paper to the skin
    Analytical and Bioanalytical Chemistry, 2010
    Co-Authors: Sandra Biedermann, Patrik Tschudin, Koni Grob
    Abstract:

    Of 13 Thermal printing papers analyzed, 11 contained 8-17 g/kg bisphenol A (BPA). When taking hold of a receipt consisting of Thermal printing paper for 5 s, roughly 1 μ gB PA (0.2-6 μg) was transferred to the forefinger and the middle finger if the skin was rather dry and about ten times more if these fingers were wet or very greasy. This amount transferred to dry skin was neither significantly increased when taking hold of the paper at up to 10 sites, nor reduced when BPA-free paper was contacted afterwards. After 60-90 min, BPA applied to the skin as a solution in ethanol was only partially or no longer at all extractable with ethanol, whereas BPA transferred to the skin by holding Thermal Printer paper remained largely extractable after 2 h. This suggests that penetration of the skin depends on the conditions. Extractability experiments did not enable us to conclude whether BPA passes through the skin, but indicated that it can enter the skin to such ad epth that it can no longer be washed off. If this BPA ends up in the human metabolism, exposure of a person repeatedly touching Thermal Printer paper for 10 h/day, such as at a cash register, could reach 71 μg/day, which is 42 times less than the present tolerable daily intake (TDI). However, if more than just the finger pads contact the BPA-containing paper or a hand cream enhances permeability of the skin, this margin might be smaller.

Ricardo E. Rivas - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography–mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL^-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys. Figure USAEME is a useful sample pretreatment procedure for controlling the small amounts of bisphenols released from samples

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography-mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils.
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys.

Ignacio López-garcía - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography–mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL^-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys. Figure USAEME is a useful sample pretreatment procedure for controlling the small amounts of bisphenols released from samples

  • Ultrasound-assisted emulsification microextraction coupled with gas chromatography-mass spectrometry using the Taguchi design method for bisphenol migration studies from Thermal Printer paper, toys and baby utensils.
    Analytical and Bioanalytical Chemistry, 2012
    Co-Authors: Pilar Viñas, Ignacio López-garcía, Natalia Campillo, Ricardo E. Rivas, Manuel Hernández-córdoba
    Abstract:

    The optimization of a clean procedure based on ultrasound-assisted emulsification liquid–liquid microextraction for the sensitive determination of four bisphenols is presented. The miniaturized technique was coupled with gas chromatography–mass spectrometry after derivatization by in situ acetylation. The Taguchi experimental method, an orthogonal array design, was applied to find the optimal combination of seven factors (each factor at three levels) influencing the emulsification, extraction and collection efficiency, namely acetic anhydride volume, sodium phosphate concentration, carbon tetrachloride volume, aqueous sample volume, sodium chloride concentration and ultrasound power and application time. A second factorial design was applied with four factors and five levels for each factor, 25 experiments being performed in this instance. The matrix effect was evaluated, and it was concluded that sample quantification can be done by calibration with aqueous standards. The detection limits ranged from 0.01 to 0.03 ng mL-1 depending on the compound. The environmentally friendly sample pretreatment procedure was applied to study the migration of the bisphenols from different types of samples: Thermal Printer paper, compact discs, digital versatile discs, small tight-fitting waistcoats, baby’s bottles, baby bottle nipples of different materials and children’s toys.