51. Novel β-cyclodextrin nanosponges by chain growth condensation for solubility enhancement of dexibuprofen: Characterization and acute oral toxicity studies
- Author
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Muhammad Usman Minhas, Nadia Shamshad Malik, Fakhra Batool, Mubashar Rehman, Qandeel Khalid, and Mahmood Ahmad
- Subjects
chemistry.chemical_classification ,Drug ,Cyclodextrin ,Chemistry ,media_common.quotation_subject ,Pharmaceutical Science ,02 engineering and technology ,021001 nanoscience & nanotechnology ,030226 pharmacology & pharmacy ,Dexibuprofen ,03 medical and health sciences ,0302 clinical medicine ,Oral administration ,Zeta potential ,medicine ,Solubility ,Swelling ,medicine.symptom ,0210 nano-technology ,Drug metabolism ,Nuclear chemistry ,medicine.drug ,media_common - Abstract
This study was designed to enhance solubility of dexibuprofen, an NSAID drug used to treat moderate to severe pain, by fabricating first generation, carbonate type nanosponges of β-CD. Novel chain-growth polycondensation method was used for the first time for preparation of the β-CD nanosponges. The results exhibited 6.3-fold enhancement of dexibuprofen solubilization which is higher than previously reported β-CD formulations. The particle size of nanosponges was 275.1 ± 28.5 nm and suitable negative zeta potential indicated formation of stable nanosponges. The formation of a new polymeric network in nanosponges and interaction of dexibuprofen with nanosponges were confirmed by FTIR and DSC/TGA studies. PXRD analysis also revealed the decline in crystallinity of dexibuprofen due to its complexation with nanosponges which is desirable for complete solubilization of drugs. At pH 6.8, β-CD nanosponges exhibited swelling index of 3 whereas solubility was enhanced more than 3 times as compared to pure drug and 2 times as compared to dexibuprofen loaded β-CD complexes. In-vitro release studies exhibited 89% drug release within 30 min at pH 6.8 with β-CD nanosponges. Dexibuprofen release at pH 1.2 was remarkably slower yet β-CD nanosponges showed superior dissolution as compared to β-CD or pure drug. Acute oral toxicity studies in rats exhibited no sign of illness, mortality, adverse clinical signs and toxicologically relevant changes in hematology, clinical biochemistry and histological findings. Thus, β-CD nanosponges prepared by optimized condensation method may be superior to other nano-formulation of β-CD to improve oral administration of lipophilic drugs such as dexibuprofen.
- Published
- 2021