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Showing 6 results for Ghorani
Volume 2, Issue 3 (Autumn 2019)
Abstract
Molecular imprinting is a novel technique for preparing specific absorbents with selective sites for binding to the target molecule. Molecularly imprinted polymers, because of their high selectivity and stability, low cost and easy methods of preparation, have been widely employed in separation procedures. In this study, we evaluated the synthesized electrospun imprinted membrane (MIM) as a specific sorbent for herbicide mecoprop (MCPP). The films were prepared using methacrylic acid (MAA) as functional monomer and polyethylene terephthalate (PET) as a main part of polymeric solution and in the presence of dichloromethane (DCM) and Trifluoroacetic acid (TFA) as the solvents. The template was extracted through washing, results in the free specific memory sites within the films. Then, the synthesized electrospun imprinted membrane (MIM) was evaluated as a specific sorbent for herbicide mecoprop (MCPP). The results showed that the solution with 20% w/v of PET was the optimal solution for electrospinning process and at all different MCPP/MAA molar ratios (1:2, 1:4. 1:6 and 1:8), MIM had higher removal ability for template molecule (p<0.05) compared to NIM. The template/monomer ratio of 1:4 had the best binding amount. We also investigated the capability of MIM to be used as sorbent for pesticide 2,4-D, that is, the analogue of the main template molecule and diazinon, that is, the pesticide with different structure to the template. In addition, we used synthesized MIM and NIM films to extract MCPP analyte from environmental aqueous samples (bottled water and groundwater) and the results indicated successful performance of MIM compared to NIN.
Volume 13, Issue 0 (kongore 94- 2015)
Abstract
Volume 13, Issue 0 (kongore 94- 2015)
Abstract
Structured polymer fibres with a diameter of about several micrometers to a few nanometres have attracted considerable attention in various scientific fields. Among the various methods applied to produce the fibre, electrospinning is proposed as one of the novel techniques. In this method, the non-woven structures are produced by applying electrical field to the polymer solution and due to the solvent evaporation. In the electrospraying method (as a branch of the electrospinning technique), the manufacturing process of the fibre production shifts to the production of capsules and thus conditions are provided for other varied applications of this technique. The electrospun fibres are applied in the processes such as filtration, tissue engineering, drug and nutraceutical targeted delivery as well as reinforcement of composite systems. In this comprehensive paper, relying on the experiences of the author, the introduction of electrospinning, the method of its implementation, and its potential applications in the food industry as well as the prospect of this technique in the industry will be discussed. Indeed, the entrances of this new approach to the food industry can induce significant alterations in this area of science.
Volume 13, Issue 61 (3-2016)
Abstract
Volume 14, Issue 64 (6-2016)
Abstract
Volume 16, Issue 89 (7-2019)
Abstract
Abstract
Encapsulation may be defined as a process to entrap one substance within another substance, thereby producing particles with diameters of a few nm to a few mm. Due to the sensitivity of bioactive compounds there are different encapsulation techniques. In recent years, electroencapsulation or encapsulation using electrohydrodynamic processes (electrospinning and elcrospraying) which is a simple and effective technique to preserve and increase bioavailibility of components, has attracted particular attention of food and drug scientists. In this technique the electrostatic force is used to form charged jet from polymer solution containing bioactive components. After that solvent is evaporated, ultrathin structures are formed. The process is called electrospraying if the droplets are atomized in the electric field and the capsule (bead shape) is formed. In the event of the formation of a stable jet and nanofibers, the process is called electrospinning. Nanofibers have outstanding features such as high surface area to volume ratio and high porosity. These features have led to the use of nanofibers for drug delivery, filtration, tissue engineering, encapsulation of bioactive compounds, enzyme stabilization, as bimolecular sensors and food packaging. This paper presents a comprehensive review of the fundamentals of electrospinning to produce nanofibers suitable for food technology application particularly for use in encapsulation.
