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Papers by Mohammad Mahmoudian
Archives of Hygiene Sciences, 2018
Background & Aims of the Study: The quality of the edible oils is made with chemical compositions... more Background & Aims of the Study: The quality of the edible oils is made with chemical compositions and percentage of the degree of unsaturation fatty acids. The peroxide value (PV) always measures the extent of primary oxidation (rancidification) of oils. Oils Rancidity can produce potentially toxic compounds associated with health effects such as heart and neurological disorders. In order to investigate initial oxidative rancidity of the oils, PV will be measured. The aim of this paper is determination of PV and the acid number taking place in oils during frying process and its relationship with demographic characteristics and environmental conditions. Materials &Methods: In this study, the statistical populations are sandwich and fast food shops of Qom city, Iran. Samples were conducted, using cluster sampling. For data collection, a questionnaire and chemical tests were used. Samples were transferred in the laboratory under cool conditions for PV and acid number (AN) examination. A hundred fifty different sample of oil were collected. Statistical analysis was performed by SPSS. The ANOVA, T-test and Pearson coefficient were used for data analysis. Results: From the points of view of PV, 80% of oils were consumable and 20% were not. The lowest and the highest number of PV were 0.6 to 16.5, respectively. The minimum and the maximum number of AN were 0.028 to 0.2, respectively. With the assumption of equal variances (p>0.05), a significant relationship between the increase after the age of the chefs and the lack of obtaining a health card was shown. The small correlation between the temperature of the oils and PV, r(150)=-0.21, p=0.009 is shown. There wasn't seen any relation between the type of oils with PV and AN. Discussion: Antioxidants, oil saturation and the reduction of temperature can reduce the production of peroxide; thus, PV was reduced. Due to the results, temperature increasing lead to increases the peroxide content. In this case, 3.3% of the edible oil samples were in rancidity conditions. Conclusion: This study has indicated that PV in almost sample was lower than the standard amount. However, removing the oil absorbed into the food leads to reducing the peroxide content and other hazardous compounds by fast-food consumers. This survey indicated that some cookers are not completely aware of government regulation and control procedures for PV and AN of frying oils.
Archives of Hygiene Sciences
Groundwater serves as the main source of drinking water in rural and urban communities. Toxic pol... more Groundwater serves as the main source of drinking water in rural and urban communities. Toxic pollutants such as organic and inorganic chemical have increased public concern related groundwater quality (1). Increasing usage of fertilizers and low efficiency treatment of wastewaters from agricultural and industrial activities has led to increase in the concentration of nitrate in surface and groundwater in many land areas. A high
Journal of Luminescence, 2010
We report the synthesis of nanostructure ZnO semiconductor with ∼2.1 nm diameter using a chemical... more We report the synthesis of nanostructure ZnO semiconductor with ∼2.1 nm diameter using a chemical precipitation method. The resulting nanoparticles were characterized by X-ray diffraction analysis (XRD), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical properties were investigated by UV–vis and fluorescence techniques. The absorption spectra exhibit a sharp absorption edge at ∼334 nm corresponding to band gap of ∼3.7 eV. The fluorescence spectra displayed a near-band-edge ultraviolet excitonic emission at ∼410 nm and a green emission peak at ∼525 nm, due to a transition of a photo-generated electron from the conduction band to a deeply trapped hole. The photocatalytic activity of the prepared ZnO nanoparticles has been investigated for the degradation of ciprofloxacin drug under UV light irradiation in aqueous solutions of different pH values. The results showed that the photocatalytic degrada...
4 Abstract: The location of a well related to surface drainage ways is important in determining t... more 4 Abstract: The location of a well related to surface drainage ways is important in determining the potential for groundwater contamination from surface water flow. Locating a well in a safe place needs careful consideration and planning.To determine the effects of well depth on water quality, the wells up to 4 m. depth and 100 m. far from river were
Archives of Hygiene Sciences, 2018
Background & Aims of the Study: The quality of the edible oils is made with chemical compositions... more Background & Aims of the Study: The quality of the edible oils is made with chemical compositions and percentage of the degree of unsaturation fatty acids. The peroxide value (PV) always measures the extent of primary oxidation (rancidification) of oils. Oils Rancidity can produce potentially toxic compounds associated with health effects such as heart and neurological disorders. In order to investigate initial oxidative rancidity of the oils, PV will be measured. The aim of this paper is determination of PV and the acid number taking place in oils during frying process and its relationship with demographic characteristics and environmental conditions. Materials &Methods: In this study, the statistical populations are sandwich and fast food shops of Qom city, Iran. Samples were conducted, using cluster sampling. For data collection, a questionnaire and chemical tests were used. Samples were transferred in the laboratory under cool conditions for PV and acid number (AN) examination. A hundred fifty different sample of oil were collected. Statistical analysis was performed by SPSS. The ANOVA, T-test and Pearson coefficient were used for data analysis. Results: From the points of view of PV, 80% of oils were consumable and 20% were not. The lowest and the highest number of PV were 0.6 to 16.5, respectively. The minimum and the maximum number of AN were 0.028 to 0.2, respectively. With the assumption of equal variances (p>0.05), a significant relationship between the increase after the age of the chefs and the lack of obtaining a health card was shown. The small correlation between the temperature of the oils and PV, r(150)=-0.21, p=0.009 is shown. There wasn't seen any relation between the type of oils with PV and AN. Discussion: Antioxidants, oil saturation and the reduction of temperature can reduce the production of peroxide; thus, PV was reduced. Due to the results, temperature increasing lead to increases the peroxide content. In this case, 3.3% of the edible oil samples were in rancidity conditions. Conclusion: This study has indicated that PV in almost sample was lower than the standard amount. However, removing the oil absorbed into the food leads to reducing the peroxide content and other hazardous compounds by fast-food consumers. This survey indicated that some cookers are not completely aware of government regulation and control procedures for PV and AN of frying oils.
Archives of Hygiene Sciences
Groundwater serves as the main source of drinking water in rural and urban communities. Toxic pol... more Groundwater serves as the main source of drinking water in rural and urban communities. Toxic pollutants such as organic and inorganic chemical have increased public concern related groundwater quality (1). Increasing usage of fertilizers and low efficiency treatment of wastewaters from agricultural and industrial activities has led to increase in the concentration of nitrate in surface and groundwater in many land areas. A high
Journal of Luminescence, 2010
We report the synthesis of nanostructure ZnO semiconductor with ∼2.1 nm diameter using a chemical... more We report the synthesis of nanostructure ZnO semiconductor with ∼2.1 nm diameter using a chemical precipitation method. The resulting nanoparticles were characterized by X-ray diffraction analysis (XRD), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical properties were investigated by UV–vis and fluorescence techniques. The absorption spectra exhibit a sharp absorption edge at ∼334 nm corresponding to band gap of ∼3.7 eV. The fluorescence spectra displayed a near-band-edge ultraviolet excitonic emission at ∼410 nm and a green emission peak at ∼525 nm, due to a transition of a photo-generated electron from the conduction band to a deeply trapped hole. The photocatalytic activity of the prepared ZnO nanoparticles has been investigated for the degradation of ciprofloxacin drug under UV light irradiation in aqueous solutions of different pH values. The results showed that the photocatalytic degrada...
4 Abstract: The location of a well related to surface drainage ways is important in determining t... more 4 Abstract: The location of a well related to surface drainage ways is important in determining the potential for groundwater contamination from surface water flow. Locating a well in a safe place needs careful consideration and planning.To determine the effects of well depth on water quality, the wells up to 4 m. depth and 100 m. far from river were