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Fabrication and Characterization of Polysorbate/Ironmolybdophosphatenanocomposite: Ion Exchange Properties and pH-responsive Drug Carrier System for Methylcobalamin


Gaurav Sharma, Amit Kumar, Inamuddin*, Mansi Sood and Abdullah M. Asiri   Pages 1 - 10 ( 10 )


Background: Nanocomposites are of great interest due to their competency to show multifunctional properties. They have been recently given much attention due to their credibility to offer the synergistic feature of organic material with those of inorganic constituents. Different types of nanocomposites have been prepared to date and are being used for different applications. The delivery of drugs in the human body at a particular site was one of the major problems in the medicinal field. The nanocomposite formulations can be used to provide controlled release and they can be combined with ligands for targeted drug delivery. Applications of the nanocomposites as ion exchangers are also increasing at a faster rate. Due to this, they help in the softening of the water. They can also be easily recharged by washing them with a solution containing a high concentration of sodium ions. In the present paper, we have worked on the synthesis and applications of the polysorbate/ironmolybdophos-phate (PS/FMP) nanocomposite. Methods: Polysorbate/ironmolybdophosphate was synthesized by co-precipitation method in the presence of polysorbate. The material was well characterized using X-ray diffractometer, Fourier transform infrared spectra, scanning transmission microscopy, and transmission electron microscopy. Physicochemical properties of material were studied in detail. Drug delivery behavior of polysorbate/ironmolybdophosphate was investigated by using methylcobalamin as a test drug. Results: The polysorbate/ironmolybdophosphate nanocomposite show enhanced Na+ ion exchange capacity of 2.1 meq/g. It has been revealed that PS/FMP nanocomposite was thermally stable as it retained the ion exchange capacity of 40.4 % at 400°C. An optimum concentration of sodium nitrate (eluant) was found to be 1.0 M for the complete removal of H+ ions from the PS/FMP column. The optimum volume of sodium nitrate (eluant) was found to be 230 mL The FTIR spectrum showed the changes in intensities of characteristic peaks in PS/FMP and in drug loaded on PS/FMP nanocomposite. The characteristic peak at 1043- 1061cm-1 was observed for ionic phosphate stretching, 560-567 for iron group and 959 cm-1due to molybdate present in the material. The additional peak at 3390 cm-1 and 1711cm-1 were due to -OH and C=O stretching due to the presence of these groups in the structure of polysorbate. The peak present at 430cm-1 might be due to the presence of Co-O stretching of methylcobalamin. The XRD results confirmed the semicrystalline structure of FMP and PS/FMP. Scanning electron micrographs results revealed the beaded surface of FMP changes to fibrous surface in case of PS/FMP nanocomposite. The TEM images indicate the appearance of smooth surfactant layer on the surface of FMP. The size of the nanocomposite is between 10- 70nm. The drug loading efficiency and encapsulation efficiency was found to be 35.2%. and 60.4%. The cumulative drug release of methylcobalamin was studied for the PS/FMP nanocomposite. The order of drug release was found to be pH 9.4 (54.6%)> pH7 .4 (46.4%)>saline (pH 5.7)(36.2%)>pH 2.2(33.9%). The release at pH 9.4 was higher. As the pH of medium changes from acidic to basic i.e. 2.2 -9.4, there is an appreciable increase in drug release from the PS/FMP nanocomposite due to the presence of more OH –ions resulting in neutralization of cationic nanocomposite and thus increasing the rate of drug release by ion exchange process and matrix deterioration. Conclusion: The novel nanocomposite PS/FMP has been synthesized by a simple co-precipitation method. The increase in Na+ ion exchange capacity for nanocomposite is due to the binding of organic part (Polysorbate) with inorganic ironmolybdophosphate. The physiochemical properties of PS/FMP were found to be superior. Fourier Transform infrared spectra of PS/FMP and drug loaded PS/FMP confirmed the formation of materials. The SEM results indicated the surface of synthesized FMP is bead-like appearance whereas the beaded surface of FMP changes to fibrous surface on the addition of polysorbate thus indicated the fabrication of nanocomposite. The cumulative drug release of methylcobalamin was studied and the order of drug release was found to be pH 9.4> pH 7 .4>saline (pH 5.7) > pH 2.2. Thus PS/FMP is a promising multifunctional nanocomposite.


Drug delivery, ion exchange, nanocomposites, drug


School of Chemistry, Shoolini University, Solan -173212, Himachal Pradesh, School of Chemistry, Shoolini University, Solan -173212, Himachal Pradesh, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh-202002, Uttar Pradesh, School of Chemistry, Shoolini University, Solan -173212, Himachal Pradesh, Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589

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