Journal of Food Measurement and Characterization, Feb 4, 2022
The novel application of Interval Variable Iterative Space Shrinkage Approach iVISSA as an advanc... more The novel application of Interval Variable Iterative Space Shrinkage Approach iVISSA as an advanced interval variable selector method and partial least square regression PLS1 for quantification of Potassium Sorbate PS, Sodium Benzoate SB, Methylparaben MP, and Propylparaben PP in food matrices is assessed. Although PS and SB are often used as preservatives, parabens such as MP and PP are currently used because of their broad antibacterial properties. The UV spectrum of the preservatives (200–300 nm) revealed significant overlap between MP/PP/SB, necessitating PLS calibration for accurate quantification. The effect of solvent composition on multivariate sensitivity, selectivity, and spectral overlaps was investigated, which has never been done before for the current system. Net-analyte signal calculations indicated that (PS/SB) and (MP/PP) were quantified in the mixture using ethanol and water–ethanol as solvents, respectively. Positive solvatochromism for PS & SB (7–10 nm) and negative solvatochromism for MP & PP (4–6 nm) were shown to increase spectral band separation of preservatives with solvent, allowing for better quantification in the mixture by PLS1. The performance of PLS was further improved by identifying relevant spectral bands with lesser overlapping using the interval variable iterative space shrinking approach iVISSA. Following local and global search procedures, iVISSA picked up the spectral variables (202–203, 209–216, 233, 282, 290, 293–296 nm) for PS, (202–204, 214–218, 235–243, 251–252, 279 nm) for SB, (212–215, 220, 226–240, 243–244, 254–256, 266–296 nm) for MP, and (212–215, 220, 226–240, 243–244,254–256, 266–296 nm) for PP. Using UV bands selected by iVISSA in conjunction with PLS calibration resulted in better prediction of preservatives in different food matrices. The tested preservatives were detected down to 1.8–5.4 mg/kg by iVISSA-PLS calibration. Cereals (18–77 mg/kg), dairy products (24–122 mg/kg), beverages (22–633 mg/kg), and condiments (85–523 mg/kg) all contained preservatives in varying amounts. The combined preservative concentration of liquid juice and soy sauce was considerable (684–707 mg/kg), but it did not surpass the safe limits. For microbiological effect, PS greatly reduced growth of Bacillus pumilus (Gram positive bacteria) and E. coli (Gram negative bacteria) in nutrient broth (pH 5.5 or pH 5.1). Also, SB greatly decreased growth of B. pumilus but did not inhibit growth of E. coli grown in nutrient broth (pH 5.5). SB significantly reduced growth of E. coli grown in nutrient broth (pH 5.1). Increasing the concentration of preservatives resulted in a notable reduction of bacterial growth.
Research on biosorption of organic dyes is an important subject for the development of clean tech... more Research on biosorption of organic dyes is an important subject for the development of clean technologies for the treatment of textile wastewater. In this work, the process of sorption of four textile dyes of different natures, namely Basic Violet 10 (BV10), Acid Red 27 (AR27), Direct Blue 151 (DB151) and Reactive Violet 4 (RV4) onto two composts, pine bark compost and municipal solid waste compost, has been studied. For this, sorption kinetics and equilibrium sorption at different solution pH values (3.0-7.0) and salinity (0-1.0 M KCl) conditions have been assessed in batch experiments. Sorption rates were relatively slow for BV10, reaching equilibrium only after 24 h, and faster for the rest: around 5-6 h for RV4 and AR27 and 2 h for DB151. Kinetics of dye sorption followed a pseudo-first order model, except that of DB151, which was better described by a pseudo-second order model. The sequence of adsorption capacity for both composts was as follows: BV10 > DB151 > RV4 > AR27. In general, dye sorption at the equilibrium was adequately described by the Langmuir model, what allows to estimate maximum retention capacities for each dye by the composts. At the best removal conditions, pine bark compost presented maximum sorption capacities of 204 mg g-1 for BV10, 54 mg g-1 for DB151, 23 mg g-1 for RV4, and 4.1 mg g-1 for AR27, whereas municipal solid waste compost showed maximum sorption of 74 mg g-1 for DB151, 38 mg g-1 for RV4, 36 mg g-1 for BV10, and 1.6 mg g-1 for AR27. Sorption increased at acid pH in all cases, likely because of modification of charges of the dyes and higher electrostatic attraction, whereas increasing salinity also had a positive effect on sorption, attributed to a solute-aggregation mechanism in solution. In conclusion, organic waste-derived products, like composts, can be applied in the removal of colorants from wastewater, although they would be more effective for the removal of basic cationic dyes than other types, due to electrostatic interaction with mostly negatively-charged composts.
... El-Geundi [2]2. El-Geundi, M. 1991. Colour Removal from Textile Effluents by Adsorption Techn... more ... El-Geundi [2]2. El-Geundi, M. 1991. Colour Removal from Textile Effluents by Adsorption Techniques. ... Al-Degs, Y, Khraisheh, MAM, Allen, SJ and Ahmad, MN 2000. ... Leon, YY, Leon, CA and Radovic, LR 1994. Chemistry and Physics of Carbon New York: Marcel Dekker. ...
Journal of Food Measurement and Characterization, Feb 4, 2022
The novel application of Interval Variable Iterative Space Shrinkage Approach iVISSA as an advanc... more The novel application of Interval Variable Iterative Space Shrinkage Approach iVISSA as an advanced interval variable selector method and partial least square regression PLS1 for quantification of Potassium Sorbate PS, Sodium Benzoate SB, Methylparaben MP, and Propylparaben PP in food matrices is assessed. Although PS and SB are often used as preservatives, parabens such as MP and PP are currently used because of their broad antibacterial properties. The UV spectrum of the preservatives (200–300 nm) revealed significant overlap between MP/PP/SB, necessitating PLS calibration for accurate quantification. The effect of solvent composition on multivariate sensitivity, selectivity, and spectral overlaps was investigated, which has never been done before for the current system. Net-analyte signal calculations indicated that (PS/SB) and (MP/PP) were quantified in the mixture using ethanol and water–ethanol as solvents, respectively. Positive solvatochromism for PS & SB (7–10 nm) and negative solvatochromism for MP & PP (4–6 nm) were shown to increase spectral band separation of preservatives with solvent, allowing for better quantification in the mixture by PLS1. The performance of PLS was further improved by identifying relevant spectral bands with lesser overlapping using the interval variable iterative space shrinking approach iVISSA. Following local and global search procedures, iVISSA picked up the spectral variables (202–203, 209–216, 233, 282, 290, 293–296 nm) for PS, (202–204, 214–218, 235–243, 251–252, 279 nm) for SB, (212–215, 220, 226–240, 243–244, 254–256, 266–296 nm) for MP, and (212–215, 220, 226–240, 243–244,254–256, 266–296 nm) for PP. Using UV bands selected by iVISSA in conjunction with PLS calibration resulted in better prediction of preservatives in different food matrices. The tested preservatives were detected down to 1.8–5.4 mg/kg by iVISSA-PLS calibration. Cereals (18–77 mg/kg), dairy products (24–122 mg/kg), beverages (22–633 mg/kg), and condiments (85–523 mg/kg) all contained preservatives in varying amounts. The combined preservative concentration of liquid juice and soy sauce was considerable (684–707 mg/kg), but it did not surpass the safe limits. For microbiological effect, PS greatly reduced growth of Bacillus pumilus (Gram positive bacteria) and E. coli (Gram negative bacteria) in nutrient broth (pH 5.5 or pH 5.1). Also, SB greatly decreased growth of B. pumilus but did not inhibit growth of E. coli grown in nutrient broth (pH 5.5). SB significantly reduced growth of E. coli grown in nutrient broth (pH 5.1). Increasing the concentration of preservatives resulted in a notable reduction of bacterial growth.
Research on biosorption of organic dyes is an important subject for the development of clean tech... more Research on biosorption of organic dyes is an important subject for the development of clean technologies for the treatment of textile wastewater. In this work, the process of sorption of four textile dyes of different natures, namely Basic Violet 10 (BV10), Acid Red 27 (AR27), Direct Blue 151 (DB151) and Reactive Violet 4 (RV4) onto two composts, pine bark compost and municipal solid waste compost, has been studied. For this, sorption kinetics and equilibrium sorption at different solution pH values (3.0-7.0) and salinity (0-1.0 M KCl) conditions have been assessed in batch experiments. Sorption rates were relatively slow for BV10, reaching equilibrium only after 24 h, and faster for the rest: around 5-6 h for RV4 and AR27 and 2 h for DB151. Kinetics of dye sorption followed a pseudo-first order model, except that of DB151, which was better described by a pseudo-second order model. The sequence of adsorption capacity for both composts was as follows: BV10 > DB151 > RV4 > AR27. In general, dye sorption at the equilibrium was adequately described by the Langmuir model, what allows to estimate maximum retention capacities for each dye by the composts. At the best removal conditions, pine bark compost presented maximum sorption capacities of 204 mg g-1 for BV10, 54 mg g-1 for DB151, 23 mg g-1 for RV4, and 4.1 mg g-1 for AR27, whereas municipal solid waste compost showed maximum sorption of 74 mg g-1 for DB151, 38 mg g-1 for RV4, 36 mg g-1 for BV10, and 1.6 mg g-1 for AR27. Sorption increased at acid pH in all cases, likely because of modification of charges of the dyes and higher electrostatic attraction, whereas increasing salinity also had a positive effect on sorption, attributed to a solute-aggregation mechanism in solution. In conclusion, organic waste-derived products, like composts, can be applied in the removal of colorants from wastewater, although they would be more effective for the removal of basic cationic dyes than other types, due to electrostatic interaction with mostly negatively-charged composts.
... El-Geundi [2]2. El-Geundi, M. 1991. Colour Removal from Textile Effluents by Adsorption Techn... more ... El-Geundi [2]2. El-Geundi, M. 1991. Colour Removal from Textile Effluents by Adsorption Techniques. ... Al-Degs, Y, Khraisheh, MAM, Allen, SJ and Ahmad, MN 2000. ... Leon, YY, Leon, CA and Radovic, LR 1994. Chemistry and Physics of Carbon New York: Marcel Dekker. ...
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