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Showing 3 results for Habibi
Moslem Sabaghi, Yahya Maghsoudlou, Parisa Habibi, Volume 2, Issue 3 (Jul-Sep 2015)
Abstract
Background and Objectives: Kefiran (Kef) is a water-soluble polysaccharide that can form transparent film however, it is brittle. Therefore, in order to improve the mechanical properties of kefiran film, a mixture with other polymers can be offered. The expansion of mixed systems can propose kefiran and polyvinyl alcohol (PVOH) as a new composite film.
Materials and Methods: Solutions of 20 gram per liter kef and 40 gram per liter of PVOH were prepared. A mixture of film-forming solutions of different ratios of Kef/PVOH (100/0, 68/32, 50/50, 32/68) was prepared. In this study, different experiments including the physical properties (thickness, moisture content, and film solubility in water), water vapor permeability, and mechanical properties (tensile strength, elongation at break, puncture strength, and puncture deformation) of composite films as well as the rheological properties of film forming solutions were investigated.
Results: The results of physical properties such as thickness, moisture content, solubility in water and mechanical properties such as tensile strength, elongation at break, puncture deformation, puncture strength and water vapor permeability indicated that the mechanical properties, thickness and solubility in water increase with increase in PVOH content however, moisture content and water vapor permeability decrease. Rheological characterization of different film forming solutions exhibited Newtonian fluid behavior.
Conclusions: These results contribute to the establishment of an approach to optimize films’ composition based on the interactions between polymers, aiming at improving the properties of polysaccharide-based films.
Keywords: Kefiran, Polyvinyl alcohol, Physical properties, Mechanical properties, Rheological properties
Hossein Habibi, Abdorreza Mohammadi, Marzieh Kamankesh, Volume 4, Issue 1 (Jan-Mar 2017)
Abstract
Background and Objectives: Furfural (F) and hydroxymethyl furfural (HMF) are cyclic aldehydes, which are formed during the heat processing of foods. These chemical contaminants have received much attention due to their suspected health hazards and heat damage indicators. The aim of the present study was extraction and determination of F and HMF in baby-foods using dispersive liquid-liquid microextraction (DLLME) coupled with high-performance liquid chromatography (HPLC).
Materials and Methods: Several effective parameters including the type and volume of extracting and disperser solvents, pH and salt amount were studied and optimized to find the best way of detecting and analyzing F and HMF. The optimized method was applied to determine F and HMF in 33 samples of baby-foods (powdered, soups, fruit puree and juices).
Results: According to the results of this study, the optimal experimental conditions were: 4.5 for pH, 60 µL for 1-octanol, 600 µL for ethanol and 2 g of salt (NaCl). The limit of detection (LOD) was 1.3 µg kg-1 for F and 2.1 µg kg-1 for HMF. F and HMF were found in all samples at levels ranging from 110 to 27510 µg kg-1 and from 200 to 25750 µg kg-1, respectively.
Conclusions: The proposed method can be considered as an effective, fast and reliable method for investigating F and HMF in baby-foods.
Keywords: Furfural, Hydroxymethyl furfural, Baby-foods, Dispersive liquid-liquid microextraction, High-performance liquid chromatography
Farid Habibi, Shabnam Movassaghi, Amirhossein Saeinia, Mohammad Mahdi Nazarnejad, Shabnam Abdi, Volume 8, Issue 2 (Apr-Jun 2021)
Abstract
Background and Objectives: Bisphenol-A (BPA) is a substance used in epoxy resin monomers and polycarbonate plastics. This research focuses on the effect of Bisphenol A on histology alterations in prefrontal cortex (PFC) of rats.
Materials and Methods: Thirty male rats were divided into 3 groups: A control group, a placebo group received distilled water intra peritoneal and the experiment group received 1.0µg/kg BPA intra peritoneal for 14 days. After 2 weeks, rat’s brains were enucleated, sequenced in 10µm widths and HE stained for histological examinations. Neural and neuroglia cells were counted and rats’ PFC volume was measured using stereological methods.
Results: Our results showed statistically significant decreases in PFC volume and neural cell count in the experiment group in comparison to both placebo and control groups. Also, results showed statistically significant increases in glial cell count in the experiment group in comparison to other groups.
Conclusions: This research showed that BPA has negative and pathological effects on neural cells and PFC in rats
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