salma salman | Ain Shams University (original) (raw)

Papers by salma salman

Research paper thumbnail of Investigation of the effects of household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in orange fruit

Hellenic Plant Protection Journal, 2021

Summary The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl a... more Summary The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in contaminated oranges has been investigated and the processing factors were determined. The evaluation included validation parameters, matrix effect (ME %), reduction behavior and processing factors (PFs). Validation parameters were successfully applied; the three pesticides showed satisfactory recovery (70–120%) and precision (relative standard deviation - RSD<20%); they also exhibited no matrix effect. The most effective process in the pesticide residues reduction was juicing, followed by pulping while the washing process was less efficient in removing all pesticide residues; sonication showed a high reduction rate with both chlorpyrifos and diazinon. The processing factors (PFs) were generally less than one which indicates that all processes can reduce pesticide residues in oranges. The results could guide the safe and reasonable use of chlorpyrifos, diazinon...

Research paper thumbnail of Coupling Between Laser Irradiation and TiO2 Nanoparticles on Efficient Decontamination of Some Pesticide's Residues from Orange and Tomato Puree

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and met...

Research paper thumbnail of Coupling between laser irradiation and TiO2 nanoparticles on efficient decontamination of some pesticide's residues from orange and tomato puree

Egyptian Journal of Chemistry

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and metalaxyl from orange puree and tomato puree. And also, proved that the efficient degradation of pesticide residues increased with an increase in laser irradiation time (for 60 min) and catalyst (TiO2nanoparticles) dosage in all experiments. Maximum reduction >80% was observed in diazinon in all puree treatments. The processing factor (PFs) was generally less than one which indicates that all processes can reduce pesticide residues in all puree treatments. The less efficient removal of pesticides residues from all treatments without Laser irradiation (dark TiO2100mg). We concluded that the optimum conditions for the photodegradation of diazinon, chlorpyrifos, and metalaxyl in all puree treatments were TiO2100mg catalyst concentration and after 60 min of laser irradiation.

Research paper thumbnail of Investigation of the effects of household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in orange fruit

Hellenic Plant Protection Journal, 2021

The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazi... more The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in contaminated oranges has been investigated and the processing factors were determined. The evaluation included validation parameters, matrix effect (ME %), reduction behavior and processing factors (PFs). Validation parameters were successfully applied; the three pesticides showed satisfactory recovery (70-120%) and precision (relative standard deviation-RSD<20%); they also exhibited no matrix effect. The most effective process in the pesticide residues reduction was juicing, followed by pulping while the washing process was less efficient in removing all pesticide residues; sonication showed a high reduction rate with both chlorpyrifos and diazinon. The processing factors (PFs) were generally less than one which indicates that all processes can reduce pesticide residues in oranges. The results could guide the safe and reasonable use of chlorpyrifos, diazinon, and metalaxyl. These processes contribute substantially to reduce consumer exposure to pesticide residues in oranges.

Research paper thumbnail of Coupling Between Laser Irradiation and TiO2 Nanoparticles on Efficient Decontamination of Some Pesticide's Residues from Orange and Tomato Puree

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and metalaxyl from orange puree and tomato puree. And also, proved that the efficient degradation of pesticide residues increased with an increase in laser irradiation time (for 60 min) and catalyst (TiO2nanoparticles) dosage in all experiments. Maximum reduction >80% was observed in diazinon in all puree treatments. The processing factor (PFs) was generally less than one which indicates that all processes can reduce pesticide residues in all puree treatments. The less efficient removal of pesticides residues from all treatments without Laser irradiation (dark TiO2100mg). We concluded that the optimum conditions for the photodegradation of diazinon, chlorpyrifos, and metalaxyl in all puree treatments were TiO2100mg catalyst concentration and after 60 min of laser irradiation.

Research paper thumbnail of Method validation and evaluation of household processing on reduction of pesticide residues in tomato

Journal of Consumer Protection and Food Safety, 2019

Metalaxyl and chlorpyriphos are widely used pesticides around the world. The purpose of this stud... more Metalaxyl and chlorpyriphos are widely used pesticides around the world. The purpose of this study was to evaluate validation parameters, matrix effect (ME %), reduction behavior, processing factor (PF) and estimate the behavior of metalaxyl and chlorpyriphos in tomato fruit samples. ''Quick, Easy, Cheap, Effective, Rugged, and Safe'' (QuEChERS) extraction and gas chromatography coupled to mass spectrometry (GC/MS) were used for the analysis. Results showed successful trends by evaluating validation parameters [selectivity, linearity, limits of detection (LOD), limits of quan-tification (LOQ) and precision]. The correlation coefficients were[0.99; the LOD for metalaxyl ranged from 0.01 to 0.003 mg/kg and the LOQ for chlorpyriphos ranged from 0.03 to 0.009 mg/kg. The matrix effect (ME %) of metalaxyl was found to exhibit a medium matrix effect while for chlorpyriphos no matrix effect was seen. Recovery (70-120%) and precision (RSD \ 20%) for both pesticides metalaxyl and chlorpyriphos were within the satisfactory ranges recommended by the European Commission. The PF was generally \ 1 (ranged between 0.34 and 0.98). Except when using washing solutions, metalaxyl PFs were[ 1. The highest reduction rate was achieved by sonication treatments which could effectively remove chlorpyriphos residues spiked in tomato matrices rather than the metalaxyl residues. On the other hand, washing treatments were less efficient in removing metalaxyl residues from tomato samples. Overall, any one of these processes can contribute substantially to reduce consumer exposure to pesticides residues in tomatoes.

Research paper thumbnail of Investigation of the effects of household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in orange fruit

Hellenic Plant Protection Journal, 2021

Summary The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl a... more Summary The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in contaminated oranges has been investigated and the processing factors were determined. The evaluation included validation parameters, matrix effect (ME %), reduction behavior and processing factors (PFs). Validation parameters were successfully applied; the three pesticides showed satisfactory recovery (70–120%) and precision (relative standard deviation - RSD<20%); they also exhibited no matrix effect. The most effective process in the pesticide residues reduction was juicing, followed by pulping while the washing process was less efficient in removing all pesticide residues; sonication showed a high reduction rate with both chlorpyrifos and diazinon. The processing factors (PFs) were generally less than one which indicates that all processes can reduce pesticide residues in oranges. The results could guide the safe and reasonable use of chlorpyrifos, diazinon...

Research paper thumbnail of Coupling Between Laser Irradiation and TiO2 Nanoparticles on Efficient Decontamination of Some Pesticide's Residues from Orange and Tomato Puree

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and met...

Research paper thumbnail of Coupling between laser irradiation and TiO2 nanoparticles on efficient decontamination of some pesticide's residues from orange and tomato puree

Egyptian Journal of Chemistry

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and metalaxyl from orange puree and tomato puree. And also, proved that the efficient degradation of pesticide residues increased with an increase in laser irradiation time (for 60 min) and catalyst (TiO2nanoparticles) dosage in all experiments. Maximum reduction >80% was observed in diazinon in all puree treatments. The processing factor (PFs) was generally less than one which indicates that all processes can reduce pesticide residues in all puree treatments. The less efficient removal of pesticides residues from all treatments without Laser irradiation (dark TiO2100mg). We concluded that the optimum conditions for the photodegradation of diazinon, chlorpyrifos, and metalaxyl in all puree treatments were TiO2100mg catalyst concentration and after 60 min of laser irradiation.

Research paper thumbnail of Investigation of the effects of household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in orange fruit

Hellenic Plant Protection Journal, 2021

The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazi... more The effect of the household processing on the reduction rate of chlorpyrifos, metalaxyl and diazinon residues in contaminated oranges has been investigated and the processing factors were determined. The evaluation included validation parameters, matrix effect (ME %), reduction behavior and processing factors (PFs). Validation parameters were successfully applied; the three pesticides showed satisfactory recovery (70-120%) and precision (relative standard deviation-RSD<20%); they also exhibited no matrix effect. The most effective process in the pesticide residues reduction was juicing, followed by pulping while the washing process was less efficient in removing all pesticide residues; sonication showed a high reduction rate with both chlorpyrifos and diazinon. The processing factors (PFs) were generally less than one which indicates that all processes can reduce pesticide residues in oranges. The results could guide the safe and reasonable use of chlorpyrifos, diazinon, and metalaxyl. These processes contribute substantially to reduce consumer exposure to pesticide residues in oranges.

Research paper thumbnail of Coupling Between Laser Irradiation and TiO2 Nanoparticles on Efficient Decontamination of Some Pesticide's Residues from Orange and Tomato Puree

In this paper, we focused on the development of photocatalytic degradation to be a promising meth... more In this paper, we focused on the development of photocatalytic degradation to be a promising method for the treatment of decontaminated fruits and vegetables with pesticides. We investigate the coupling between Laser irradiation with TiO2 nanoparticles catalyst in order to study the photocatalytic degradation of metalaxyl, chlorpyrifos, and diazinon from artificially contaminated tomato puree and orange puree. Degradation products were identified by gas chromatography-mass spectrometry (GC-MS). The influences of different parameters such as catalyst concentration, irradiation time on the reaction rate were ascertained and optimum conditions for maximum degradation were determined. The degradation percentage of all pesticides was achieved under optimized conditions (1g/L catalyst at the irradiation time of 120 min). The study proved that the coupling between TiO2 nanoparticles and laser irradiation has a high potential for photocatalytic degradation of diazinon, chlorpyrifos, and metalaxyl from orange puree and tomato puree. And also, proved that the efficient degradation of pesticide residues increased with an increase in laser irradiation time (for 60 min) and catalyst (TiO2nanoparticles) dosage in all experiments. Maximum reduction >80% was observed in diazinon in all puree treatments. The processing factor (PFs) was generally less than one which indicates that all processes can reduce pesticide residues in all puree treatments. The less efficient removal of pesticides residues from all treatments without Laser irradiation (dark TiO2100mg). We concluded that the optimum conditions for the photodegradation of diazinon, chlorpyrifos, and metalaxyl in all puree treatments were TiO2100mg catalyst concentration and after 60 min of laser irradiation.

Research paper thumbnail of Method validation and evaluation of household processing on reduction of pesticide residues in tomato

Journal of Consumer Protection and Food Safety, 2019

Metalaxyl and chlorpyriphos are widely used pesticides around the world. The purpose of this stud... more Metalaxyl and chlorpyriphos are widely used pesticides around the world. The purpose of this study was to evaluate validation parameters, matrix effect (ME %), reduction behavior, processing factor (PF) and estimate the behavior of metalaxyl and chlorpyriphos in tomato fruit samples. ''Quick, Easy, Cheap, Effective, Rugged, and Safe'' (QuEChERS) extraction and gas chromatography coupled to mass spectrometry (GC/MS) were used for the analysis. Results showed successful trends by evaluating validation parameters [selectivity, linearity, limits of detection (LOD), limits of quan-tification (LOQ) and precision]. The correlation coefficients were[0.99; the LOD for metalaxyl ranged from 0.01 to 0.003 mg/kg and the LOQ for chlorpyriphos ranged from 0.03 to 0.009 mg/kg. The matrix effect (ME %) of metalaxyl was found to exhibit a medium matrix effect while for chlorpyriphos no matrix effect was seen. Recovery (70-120%) and precision (RSD \ 20%) for both pesticides metalaxyl and chlorpyriphos were within the satisfactory ranges recommended by the European Commission. The PF was generally \ 1 (ranged between 0.34 and 0.98). Except when using washing solutions, metalaxyl PFs were[ 1. The highest reduction rate was achieved by sonication treatments which could effectively remove chlorpyriphos residues spiked in tomato matrices rather than the metalaxyl residues. On the other hand, washing treatments were less efficient in removing metalaxyl residues from tomato samples. Overall, any one of these processes can contribute substantially to reduce consumer exposure to pesticides residues in tomatoes.