Using natural waste resources as a starting material for the preparation of cellulose nanoparticles is a field of interest for novel pharmaceutical applications. This study aims to introduce cellulose nanoparticles for Doxorubicin (DOX) delivery to tumor cells. Cellulose nanocrystals were first produced from waste cotton by hydrochloric acid (1 M) hydrolysis, and then spherical cellulose nanoparticles were prepared by microemulsion method. The prepared particles were spherical with 300 nm in size, and the zeta potential was À 12.5 mV. The drug entrapment efficiency was ∼ 99 % (w/w). DOX loaded particles exhibited a biphasic release pattern at pH 7.4 phosphate buffer without initial burst effect. Release experiments demonstrated that DOX release was up to 34 days (97 %). In vitro cytotoxicity assay on human A549 (human lung adenocarcinoma) cell line was performed by MTT assay. The results show that prepared particles are effective on cancer cells. It is important in terms of economic and environmental problems that the material prepared for use in cancer drug release presented here is obtained from the waste cotton.
Large amounts of waste cotton material generated in textile production cause environmental problems and resource depletion. The production of nanocrystalline cellulose is one of the effective way to the recycling of waste cotton. Cellulose nanoparticles are of great interest in biomedical applications due to their various properties. In this study cellulose nanocrystals were produced from waste cotton through acid hydrolysis in a single step. The extraction of cellulose from waste cotton was carried out by alkaline treatment, afterthat the cellulose nanocrystals were isolated by the nitric acid (68% w/w) and hydrochloride acid (37% w/w) mixture acid hydrolysis. Cellulose nanocrystals were oxidized by sodium periodate (NaIO4) for functionalization. The prepared cellulose nanocrystals were characterized by Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) then gentamicin conjugation studies were carried out. Gentamicin conjugated cellulose nanoparticles were examined for antimicrobial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. Aureus), Pseudomonas aeruginosa(aeruginosa), Klebsiella pneumoniae (K. pneumoniae) and antifungal activity against Candida albicans (C. Albicans). The results confirmed that the periodate oxidized cellulose nanocrystals are effective on bacterai and fungus.
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