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Gholamreza Jahed Khaniki

Bio: Gholamreza Jahed Khaniki is an academic researcher from Tehran University of Medical Sciences. The author has contributed to research in topics: Aflatoxin & Phthalate. The author has an hindex of 15, co-authored 68 publications receiving 632 citations.


Papers
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Journal ArticleDOI
TL;DR: A new pH-responsive color indicator film was prepared by blending barberry anthocyanin with methylcellulose/chitosan nanofiber composite film, being suitable for indicating the change in food pH, the formation of volatile nitrogen compounds, and food decay.

132 citations

Journal ArticleDOI
TL;DR: According to results from the present study, effective control measures should be implemented to minimize the microbiological contamination of fresh produce sold in Tehran, Iran.
Abstract: The aim of this study was to evaluate the bacterial and fungal quality of minimally-processed vegetables (MPV) and sprouts. A total of 116 samples of fresh-cut vegetables, ready-to-eat salads, and mung bean and wheat sprouts were randomly collected and analyzed. The load of aerobic mesophilic bacteria was minimum and maximum in the fresh-cut vegetables and fresh mung bean sprouts respectively, corresponding to populations of 5.3 and 8.5 log CFU/g. E. coli O157:H7 was found to be absent in all samples; however, other E. coli strains were detected in 21 samples (18.1%), and Salmonella spp. were found in one mung bean (3.1%) and one ready-to-eat salad sample (5%). Yeasts were the predominant organisms and were found in 100% of the samples. Geotrichum, Fusarium, and Penicillium spp. were the most prevalent molds in mung sprouts while Cladosporium and Penicillium spp. were most frequently found in ready-to-eat salad samples. According to results from the present study, effective control measures should be implemented to minimize the microbiological contamination of fresh produce sold in Tehran, Iran.

75 citations

Journal ArticleDOI
TL;DR: Health risk assessment indicated that both adults and children are at considerable non-carcinogenic health risk for Al (THQ > 1).
Abstract: In the current study, the concentration of heavy metals including lead (Pb), chromium (Cr), cadmium (Cd), and aluminum (Al) in commonly instant noodles consumed in Iran (either imported from other countries or produced in Iran) was investigated by acid digestion method followed by an inductively coupled plasma optical emission spectrometry system (ICP-OES). Also, the associated non-carcinogenic risk due to ingestion of heavy metals for adults and children was estimated by calculating percentile 95% target hazard quotient (THQ) in the Monte Carlo simulation (MCS) method. The average concentrations of Pb, Cr, Cd, and Al in Iranian instant noodle samples were measured as 1.21 ± 0.81, 0.08 ± 0.10, 0.03 ± 0.06, and 9.15 ± 4.82 (mg/kg) and in imported instant noodle samples were 1.00 ± 0.61, 0.07 ± 0.07, 0.04 ± 0.03, and 15.90 ± 0.93 (mg/kg), respectively. A significant difference (p value 1). Therefore, approaching the required strategies in order to reduce the concentration of heavy metals particularly Al in the instant noodle is recommended.

47 citations

Journal ArticleDOI
TL;DR: The magnetic multi-walled carbon nanotubes were used as adsorbents of phthalate acid esters (PAEs) due to a superior adsorption capability of hydrophobic compounds and the concentration of migrated PAEs from bottle into all the examined Doogh samples was below the defined standards by EPA.
Abstract: In the current study, a novel magnetic solid phase extraction (MSPE) technique combined with a gas chromatography/mass spectroscopy (GC/MS) was developed to determine the phthalate ester content of bottled Doogh samples. Doogh is a yogurt-based drinking beverage, which is frequently consumed in Middle East and Balkans. It is produced by stirring yogurt in Chern separation machine and consists of substances such as water, yogurt, and salt in addition to aqueous extracts of native herbs. The magnetic multi-walled carbon nanotubes (MWCNT-Fe3O4) were used as adsorbents of phthalate acid esters (PAEs) due to a superior adsorption capability of hydrophobic compounds. In this context, the quantity of the extractable migrated phthalate esters (dibutyl phthalate (DBP), dimethyl phthalate (DMP), butyl benzyl phthalate (BBP), diethyl phthalate (DEP), di-N-octyl phthalate (DNOP), and bis (2-ethylhexyl) phthalate (DEHP)) from polyethylene terephthalate (PET) bottles into Doogh samples was measured. The correlation between the concentration of migrated PAEs and some factors such as the type of Doogh (gaseous and without gas), difference in brand (five brands), volume (1500 and 300 mL), and the storage time also was investigated. The migration level into Doogh samples was increased by incorporating of gas as well as increasing the volume of PET bottles. Also, with elaborating of storage time, the migration of some phthalates such as DEHP (the mean from 2419.85 ng L−1 in the first week to 2716.15 ng L−1 in the second month), DEP, and total phthalate was increased. However, no significant difference in concentrations of migrated phthalate esters among different examined brands was noted. Finally, the concentration of migrated PAEs from bottle into all the examined Doogh samples was below the defined standards by EPA; 6 μg/L for DEHP in drinking water.

47 citations


Cited by
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Journal ArticleDOI
TL;DR: Volume II covers the systemic and special pathology of the alimentary, urinary, and nervous system and the liver, peritoneum, mesentery, muscle, eye, ear, skin, and appendages and the important subject of neoplasia seems to suffer somewhat from the organ-system method of presentation.
Abstract: Volume II covers the systemic and special pathology of the alimentary, urinary, and nervous system and the liver, peritoneum, mesentery, muscle, eye, ear, skin, and appendages. Certain diseases which resisted the authors' systemic classification (including African horsesickness, hog cholera, toxoplasmosis, and tickborne fever) are covered in the appendix. The rather unusual method of presentation of the material will elicit varying responses, and the over-all effectiveness of the arrangement cannot be judged until the book has been used extensively by workers in a variety of activities. Both volumes are sure to be received favorably by research workers and teachers—if not because of the unusual arrangement, then in spite of it, for this is indeed a notable production. The important subject of neoplasia seems to suffer somewhat from the organ-system method of presentation. This may be justified, however, by the strong emphasis on the diseases of organs and systems which has been achieved.

322 citations

Journal ArticleDOI
TL;DR: The ability of some plant secondary metabolites to act as resistance-modifying agents is a promising field in mitigating the spread of bacterial resistance.
Abstract: Antibiotic-resistant microorganisms have been an ever-growing concern over the past years. This has led researchers to direct their attention onto plants to be able to discover new possible antimicrobial compounds. The Middle East encompasses a wide spectrum of plant diversity with over 20,000 different species in habitats ranging from deserts to snow-capped mountains. Several plant secondary metabolites and their derivatives have been identified as possible antimicrobial agents. Among the secondary metabolites studied, alkaloids and polyphenols have shown strong antimicrobial activity. Polyphenols are one of the most numerous and diverse group of secondary metabolites; their antioxidant properties provide the basis for antimicrobial effects. Alkaloids provided the underlying structure for the development of several antibiotics with a diverse range of action. The ability of some plant secondary metabolites to act as resistance-modifying agents is a promising field in mitigating the spread of bacterial resistance.

292 citations

31 Dec 2005
TL;DR: The aqueous and acetone extracts displayed similarities in their antimicrobial activity on the bacterial species and as such, the galls of Quercus infectoria are potentially good source of antimicrobial agents.
Abstract: OBJECTIVE: To evaluate the antibacterial potential of aqueous and acetone extracts of galls of Quercus infectoria by determination of Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) values. MATERIALS AND METHODS: The extracts from the galls of Q. infectoria at 10 mg/ml were screened against three Gram-positive bacteria (Staphylococcus aureus ATCC 25923, Staphylococcus epidermidis and Bacillus subtilis) and three Gram-negative bacteria (Escherichia coli NCTC 12079 serotype O157:H7, Salmonella typhimurium NCTC 74 and Pseudomonas aeruginosa ATCC 27853). The MIC of the extracts were then determined using the twofold serial microdilution technique at a concentration ranging from 5 mg/ml to 0.0024 mg/ml. The MBC values were finally obtained from the MIC microtiter wells which showed no turbidity after 24 hrs of incubation by subculturing method. RESULTS: Out of the six bacterial species tested, S. aureus was the most susceptible. On the other hand, the extracts showed weak inhibitory effect against S. epidermidis, B. subtilis, S. typhimurium and P. aeruginosa while there was no inhibition zone observed for E. coli O157. The MIC values of the extracts ranged from 0.0781 mg/ml to 1.25 mg/ml whereas the MBC values ranged from 0.3125 mg/ml to 2.50 mg/ml. The MBC values of aqueous extract against S. aureus and S. typhimurium were higher than their MIC values. The MBC value of acetone extract against S. aureus was also higher than its MIC value. Interestingly, however, the MIC and MBC values of acetone extract against S. typhimurium were the same (1.25 mg/ml). CONCLUSION: The aqueous and acetone extracts displayed similarities in their antimicrobial activity on the bacterial species and as such, the galls of Quercus infectoria are potentially good source of antimicrobial agents.

285 citations

Journal ArticleDOI
TL;DR: The little data about pharmaceutical residue contamination in African water bodies motivated this study on the occurrence of pharmaceutical residues in the water and sediment of Msunduzi River in the KwaZulu-Natal province of South Africa; and in the Darvill wastewater treatment plant found in Msundyuzi catchment.

196 citations

Journal ArticleDOI
TL;DR: Considering the toxic effect of some elements, including Pb and As, in the chronic exposure of consumers, it is suggested a continuous evaluation and monitoring of drinking water resources.
Abstract: The present work reports the As, Cr, Cu, Pb, Zn, and Fe concentrations of drinking water samples in Neyshabur Plain, Iran. This study aimed also to ascertain the potential consumers’ health risk of heavy metal intake. Heavy metal concentrations were analyzed by inductively coupled plasma optical emission spectrometry. The highest and lowest average values in the analyzed water samples were observed for Fe (9.78 ± 5.61 μg/L) and As (1.30 ± 2.99 μg/L), respectively. These values were well below the limits recommended by the World Health Organization and the Iranian national standard. Heavy metal pollution index and heavy metal evaluation index were used to evaluate drinking water quality. The risk index was calculated by chronic daily intake and hazard quotient according to the United States Environmental Protection Agency approach. Heavy metal pollution index in all the samples was less than 100, indicating that it is a low-level heavy metal. The total risk of all heavy metals in the urban environment varied from 40.164 × 10−7 to 174.8 × 10−7. In this research, the maximum average of risk belonged to lead and copper with the respective values of 60.10 × 10−7and 33.99 × 10−7 from the selected wells. However, considering the toxic effect of some elements, including Pb and As, in the chronic exposure of consumers, we suggest a continuous evaluation and monitoring of drinking water resources.

165 citations