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                <term xml:lang="en">In vivo cytotoxicity</term>
                <term xml:lang="en">Sustained release</term>
                <term xml:lang="en">Polyelectrolyte complex</term>
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              <p>The goal of this research was to develop, fabricate and analyze polymeric nanoparticles for the administration of methotrexate (MTX). Linseed mucilage and chitosan nanoparticles (NPs) were prepared using a slightly modified polyelectrolyte complex (PEC) method. The size, shape, and encapsulation effectiveness of the resultant nanoparticles were measured. MTX release profiles at gastrointestinal pH (1.2 and 7.4) and tumor pH (5.5) were examined to determine the targeted potential of NPs as pH-responsive nanocarriers. Zeta analysis showed that nanoparticles prepared by PEC have a size range of 192.1 nm to 246 nm, and PDI was 0.3 of the optimized formulation, which showed homogenous nature of prepared nanoparticles formulation. The findings demon-strated that NPs have a low polydispersity index and a positive zeta potential (PDI). The in-vitro release of the drug indicated a pH-dependent, sustained drug release up to 24 h. Blank LSMCSNPs had almost no in-vivo cytotoxicity for 14 days, while optimum MTX loaded NPs had strong anti-tumor effects on HepG2 and MCF-7 cells as measured by the MTT assay. Cell apoptosis induction was also checked and MCF-7 cells treated with MTX-LSMCSNPs had a significantly greater rate of apoptosis (21.2 %) than those treated with MTX alone (14.14 %). The findings show that LSMCSNPs could be a potential delivery mechanism for methotrexate to cancer cells in a secure, steady, and ideally controlled manner to improve therapeutic outcomes.(c) 2022 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).</p>
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