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As a novel drug delivery system, methotrexate (MTX) was conjugated to the obtained nanoparticles. These MNPs conjugate can potentially use in controlled drug delivery as carrier, and in magnetic resonance imaging as a contrast agent. Also, these nanoparticles can serve as a target in cancer therapy and diagnosis. These MNPs were covalently bond with MTX and can target the majority of cancer cells that their surfaces overexpressed by folate receptors. These conjugated nanoparticles were obtained through amide bond between the amine groups on their surface and the carboxylic acid end groups on MTX due to being functionalized with arginine. MTX was cleaved from nanoparticles according to drug release experiments in the presence of protease\u2010like lysosomal conditions. Fe\u2010Arg\u2010MTX was characterized by transmission electron microscopes, dynamic light scattering, thermogravimetric analysis, differential scanning calorimetry, X\u2010ray diffraction, and Fourier transform infrared spectroscopy. Furthermore, vibrating sample magnetometry analysis showed excellent magnetic properties of them. The average particle size of Fe\u2010Arg\u2010MTX was approximately 27\u2009nm. The result revealed that the bare nanoparticles have no cytotoxicity against MCF\u20107, 4T1, and HFF\u20102 cell lines. Hemolysis assay showed that these nanoparticles are biocompatible. Regarding the research success, an efficient technique can be presented for drug delivery and controlled release and for studying cancer\u2010fighting in alive creature's bodies.<\/jats:p>","DOI":"10.1002\/jbm.a.36755","type":"journal-article","created":{"date-parts":[[2019,7,12]],"date-time":"2019-07-12T15:54:20Z","timestamp":1562946860000},"page":"2492-2500","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":82,"title":["Methotrexate anticancer drug delivery to breast cancer cell lines by iron oxide magnetic based nanocarrier"],"prefix":"10.1002","volume":"107","author":[{"given":"Elahe","family":"Attari","sequence":"first","affiliation":[{"name":"School of Pharmacy Zanjan University of Medical Sciences  Zanjan 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