Abstract
To prepare the cocrystals of 5-fluorouracil (5-FU) with GRAS status coformers via a cocrystallization technique with an aim to improve physicochemical properties as well as bioavailability for colon cancer, breast cancer, and prostate cancer. The mechanochemical method was used in the preparations of three crystals of 5-FU with gentisic acid (5-FUGA), 3,4-dihydroxybenzoic acid (5-FUBA), and 4-aminopyridine (5-FUPN). A thermoanalytical and spectroscopic technique was used for their characterization. Their biological evaluation was done in different cancer cell lines. The new solid pure crystal forms were characterized by DSC, FTIR, and PXRD. The crystal structure was determined from single crystal and PXRD that exposed the existence of the monoclinic and triclinic crystal system with P21/n and P-1 space groups. The dermatokinetic studies on the rat skin revealed two- to threefold improvement in relative bioavailability as compared to pure 5-FU. “MTT assay was performed by varying the concentrations of the drug from 1 to 50 μg mL−1. After 24 h, the cell viability dropped to 70.67%, 74.05%, and 76.37% in MCF-7, Hela, and Caco-2 cell lines when the concentration of 5-FU was 50 μg mL−1”, while it dropped dramatically in cocrystals 5-FUGA (22.06%, 24.63%, and 25.61%), 5-FUBA (31.22%, 29.46%, and 32.81%), and 5-FUPN (21.65%, 32.64%, and 21.46%). All the results indicated that 5-FU cocrystals possess better antitumor efficacy than free drug. Thus, cocrystallization expands the extent of the existing pre-formulation options ahead of pure API form to ameliorate the bioavailability and permeability.
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Funding
The authors received financial support from the University Grants Commission (UGC), New Delhi, India (vide letter, number F1-17.1/2013-14/RGNF-2013-14-SC-UTT-55580), to Manoj Kumar Gautam as a UGC-RGNF fellow for accomplishing this work, and financial assistance from the CSIR (No. 02(0279)/16/EMR-II), New Delhi, India.
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Gautam, M.K., Besan, M., Pandit, D. et al. Cocrystal of 5-Fluorouracil: Characterization and Evaluation of Biopharmaceutical Parameters. AAPS PharmSciTech 20, 149 (2019). https://doi.org/10.1208/s12249-019-1360-9
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DOI: https://doi.org/10.1208/s12249-019-1360-9