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Articles by Hossein HOSSEINZADEH
Total Records ( 4 ) for Hossein HOSSEINZADEH
  Yaghob Porasad and Hossein Hosseinzadeh
  This study presents the comparative evaluation of the performance of the two main control techniques for Grid Connected Inverters. Sinusoidal Pulse Width Modulation voltage controller and hysteresis current controller are considered here. The main control innovations, determined by industrial applications, are presented. Finally, suitable criteria for the comparison are identified and simulations investigation differences in the performance of the controllers in a typical static synchronous var compensator setup.
  Leila Etemad , Reza Zafari , Naser Vahdati- Mashhadian , Seyed Adel Moallem , Zahra Oskouei Shirvan and Hossein Hosseinzadeh
  Verbascoside or acteoside is the most abundant phenylethanoid glycoside that possesses health beneficial pharmacological activities, including anti-nociceptive, anti-inflammatory and anti-cancer. Due to the wide range of pharmacological activities of verbascoside and insufficient data on the safety profile, the acute, subacute and cellular toxicity of verbascoside was determined. The acute and subacute toxicity of verbascoside was evaluated in mice after single intraperitoneal injection at the dose range of 0, 1, 2 and 5 g kg–1 b.wt. (acute model) and 21 days administration at the dose range of 0, 10, 30 and 60 mg kg–1 b.wt. (subacute model). In MTT assay, HepG2 and NIH cells were exposed to different concentrations of verbascoside. According to result, the LD50 value of verbascoside was found to be greater than 5 g kg–1. In subacute toxicity study, no statistically significant differences were observed in the values of hematological, biochemical and pathological parameters in comparison with control group. The cytotoxicity assay revealed that the viability in all groups were greater than the IC50 value. In conclusion, the results from the present study elucidate that verbascoside is well tolerated for both single and chronic administration and does not produce any toxic effects or deaths in animals.
  Mohammad SADEGHI and Hossein HOSSEINZADEH
  Superabsorbent polymers based on starch (St) and polyacrylonitrile (PAN) were prepared by alkaline hydrolysis of the physical mixture of St and PAN in aqueous solution. The nitrile groups of PAN were completely converted to a mixture of hydrophilic carboxamide and carboxylate groups during alkaline hydrolysis, followed by in situ cross-linking of the PAN chains by the alkoxide ions of St. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR spectroscopy. Moreover, morphology of the samples was examined by scanning electron microscopy. The factors that influenced the swelling capacity of the hydrogels were systematically optimized to achieve a hydrogel with swelling capacity as high as possible. Furthermore, the salt sensitivity of the hydrogels was investigated in different saline solutions. The pH-reversibility and on-off switching properties of the hydrogels make the intelligent polymers good candidates for consideration as potential carriers of bioactive agents. Finally, the swelling and de-swelling kinetics behaviors of the hydrogels were preliminarily investigated as well.
  Mohammad SADEGHI and Hossein HOSSEINZADEH
  Superabsorbent polymers are obtained by the graft copolymerization of 2-acrylamido-2-methylpropanesul- fonic acid (AMPS) monomer onto collagen, using ammonium persulfate as a free radical initiator in the presence of methylene bisacrylamide as a crosslinker. Infrared spectroscopy and TGA thermal analysis were carried out to confirm the chemical structure of the hydrogel. Moreover, morphology of the samples was examined by scanning electron microscopy (SEM). The effect of reaction variables on swelling capacity was investigated to achieve a hydrogel with improved water absorbency. Under the optimized conditions concluded, maximum capacity of swelling in distilled water was found to be 268 g/g. The swelling ratio in various salt solutions was investigated in detail. Since this hydrogel exhibited a very high absorptivity in saline, it may be referred to as a low salt-sensitive superabsorbent. The collagen-g-AMPS hydrogel also showed cation exchange properties. The swelling kinetics of the synthesized hydrogels with various particle sizes was also preliminarily investigated.
 
 
 
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