The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Mehrorang Ghaedi - One of the best experts on this subject based on the ideXlab platform.
-
ultrasonically synthesis of mn and cu zns nps AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC e129 in food and water samples
Ultrasonics Sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD
-
Ultrasonically synthesis of Mn- and Cu- @ ZnS-NPs-AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC (E129) in food and water samples.
Ultrasonics sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD
Angelina Hormaza-anaguano - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of a Trametes pubescens lACcase concentrated extrACt on Allura Red AC decolorization without the addition of synthetic mediators.
Journal of environmental management, 2021Co-Authors: Felipe Mejía-otálvaro, Andrés Merino-restrepo, Angelina Hormaza-anaguanoAbstract:AbstrACt Synthetic dye bioremediation is a topic of great importance since these pollutants possess toxic effects, and huge quantities of them are being discharged into water bodies. Ligninolytic enzyme treatment stands out for being a cost-effective methodology, capable of obtaining high decolorization levels. In this work, a lACcase enzyme treatment was evaluated to effectively perform a cycle of dye bioremediation. Furthermore, a dye decolorization improvement was also assessed through lACcase immobilization. Particularly, a Trametes pubescens enzyme extrACt was concentrated, immobilized onto calcium alginate beads, and charACterized to assess its dye decolorization potential. Ammonium sulfate precipitation and vACuum evaporation were evaluated to concentrate the crude extrACt and to decolorize Allura Red AC. Both treatments reAChed a high enzyme yield recovery (>90%), but only the vACuum-evaporated extrACt AChieved a high Allura Red AC decolorization level after 16 h of contACt time. This suggested that essential compounds for Allura Red AC decolorization were present in the crude extrACt, implying that neither a complete lACcase purification process nor an addition of synthetic mediators are necessary. Under optimized immobilization conditions, 94.6% immobilization efficiency and 49.8% ACtivity recovery were obtained with 0:1 alginate:enzyme (v/v), 100 mM CACl2, and 5.0% w/v sodium alginate. Furthermore, by immobilizing the lACcase concentrated extrACt, both the pH and temperature stabilities were improved. The decolorization of Allura Red AC by free and immobilized lACcase was 68.4% and 4.6%, respectively, showing that although the enzyme stability was improved, dye decolorization was negatively affected. Thus, an efficient Allura Red AC decolorization was obtained with concentrated-free lACcase by a feasible and low-cost methodology.
-
Evaluation of several white-rot fungi for the decolorization of a binary mixture of anionic dyes and charACterization of the residual biomass as potential organic soil amendment.
Journal of environmental management, 2019Co-Authors: Andrés Merino-restrepo, Felipe Mejía-otálvaro, Carolina Velásquez-quintero, Angelina Hormaza-anaguanoAbstract:Industrial pollution is a great concern for modern society and developing cyclic processes is one of the major challenges. As far as we know, this work is the first to report the use of multiple white-rot fungi species for degrading a binary mixture of anionic dyes under solid state fermentation (SSF) conditions and a further physicochemical charACterization of the residual biomass. First, eight white-rot fungi decolorized the dye mixture of brilliant blue FCF and Allura Red AC adsorbed onto corncob, reAChing decolorizations between 11.47% and 87.64%. Then, I. lACteus, B. adusta and T. versicolor, based on the decolorization yield, were selected to evaluate the effect of carbon:nitrogen ratio, moisture content and inoculum quantity on the decolorization percentage. The fACtorial designs showed that C:N ratio had a negative effect while moisture and inoculum quantity a positive effect. In terms of the kinetics, the three white-rot fungi AChieved their maximum decolorization level, around 80.11-86.04%, after 10-12 days. I. lACteus exhibited the highest decolorization percentage, even though only the enzyme manganese peroxidase was detected, with a maximum ACtivity of 6.62 U gds-1 at day 14. Besides, T. versicolor was the only species with lACcase ACtivity, with a maximum of 15.94 U gds-1 at day 6 of fermentation. The physicochemical charACterization of the biomass allowed to conclude that these aggregates represent a potential organic amendment, as for their significant oxidizable organic carbon (more than 9.5% on wet basis) and essential nutrients content, as well as for their low ash content (less than 1% on wet basis). Finally, for outlining an efficient bioremediation cycle, a cheap and effective methodology for drying the biomass at the end of the SSF process is requiRed.
Abbas Ostovan - One of the best experts on this subject based on the ideXlab platform.
-
ultrasonically synthesis of mn and cu zns nps AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC e129 in food and water samples
Ultrasonics Sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD
-
Ultrasonically synthesis of Mn- and Cu- @ ZnS-NPs-AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC (E129) in food and water samples.
Ultrasonics sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD
Kan-jung Chia - One of the best experts on this subject based on the ideXlab platform.
-
Determination of sulphonated azo dyes in food by ion-pair liquid chromatography with photodiode array and electrospray mass spectrometry detection
Talanta, 2002Co-Authors: Kan-jung ChiaAbstract:AbstrACt An ion-pair liquid chromatography method with on-line photodiode-array and electrospray mass spectrometry detection was developed to determine 10 commonly used sulphonated azo dyes (Tartrazine, Amaranth, New Coccine, Sunset Yellow FCF, Allura Red AC, Ponceau R, Ponceau 3R, Orange I, Orange II and Metanil Yellow) in food. A reversed phase C18 column with gradient elution was utilized to separate these compounds. Triethylamine was added in the mobile phase as an ion-pair reagent for chromatographic separation. Photodiode-array detection was employed for quantitative determination and electrospray mass spectrometry was used for identification. Good linearity (0.05–10 ppm, r2=0.999) and detection limit (
-
determination of sulphonated azo dyes in food by ion pair liquid chromatography with photodiode array and electrospray mass spectrometry detection
Talanta, 2002Co-Authors: Kan-jung ChiaAbstract:An ion-pair liquid chromatography method with on-line photodiode-array and electrospray mass spectrometry detection was developed to determine 10 commonly used sulphonated azo dyes (Tartrazine, Amaranth, New Coccine, Sunset Yellow FCF, Allura Red AC, Ponceau R, Ponceau 3R, Orange I, Orange II and Metanil Yellow) in food. A reversed phase C18 column with gradient elution was utilized to separate these compounds. Triethylamine was added in the mobile phase as an ion-pair reagent for chromatographic separation. Photodiode-array detection was employed for quantitative determination and electrospray mass spectrometry was used for identification. Good linearity (0.05–10 ppm, r2=0.999) and detection limit (<0.01 ppm) were determined with 5 μl injection. In addition, precision and ACcurACy associated with this newly developed method will be presented. A liquid extrACtion method was also developed to extrACt these dyes from different foodstuffs. The application of this method was demonstrated by analyzing sulphonated azo dyes in soft drinks, fruit jam, and salted vegetables.
Hamideh Asadollahzadeh - One of the best experts on this subject based on the ideXlab platform.
-
ultrasonically synthesis of mn and cu zns nps AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC e129 in food and water samples
Ultrasonics Sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD
-
Ultrasonically synthesis of Mn- and Cu- @ ZnS-NPs-AC based ultrasound assisted extrACtion procedure and validation of a spectrophotometric method for a rapid preconcentration of Allura Red AC (E129) in food and water samples.
Ultrasonics sonochemistry, 2018Co-Authors: Abbas Ostovan, Hamideh Asadollahzadeh, Mehrorang GhaediAbstract:AbstrACt This study is devoted on Allura Red as food colorant preconcentration and determination in beverage, fruit juice and drink water samples is based on usage of Mn- and Cu- @ ZnS-NPs-AC as new sorbent for ultrasound-assisted-dispersive solid-phase microextrACtion (UA-DSPME) combined with ultraviolet–visible spectrophotometric based method (UV–Vis). Contribution of volume of eluent, pH, sorbent mass and sonication time on response following conduction of 28 experiments were optimized and investigated while their significantly justified ACcording to p-value. Values of “Prob > F” less than 0.0500 is proportional with their significant influence on recovery of analyte. Under the optimum conditions 0.14 mL of THF; pH of 2.5; 8 mg of sorbent and 3 min sonication time guide and help AChievement of limit of quantification (LOQ) and limit of detection (LOD) of 6.08 and 20.26 ng mL−1, respectively. The ACcurACy of method was validated ACcording to calculation of recovery following spiking 400 and 600 ng mL−1 to blank solution and recovery as more reliable indication of ACcurACy 93.41 and 102.17% recoveries with RSD