Abstract
Oncocalyxone A (onco A) isolated from heartwood of Cordia oncocalyx (Auxemma oncocalyx), exhibits antitumor, analgesic and anti-inflammatory activities. In order to produce drug delivery systems containing onco A, the objective of this study was to develop and validate an HPLC method for quantifying onco A in different media and nanocapsules. The validation method was performed according to ICH guidelines for pharmaceutical products. The solubility of onco A was determined in deionized water, simulated gastric and intestinal fluids, buffer solutions at pH 5.5, 7.0, 9.0 and oils: copaiba, soybean and medium-chain triglycerides. The partition coefficients of onco A between n-octanol, oils and aqueous phase were determined at 25 °C. Accuracy, intra- and inter-day precision values presented low random errors (less than or equal to 2.53, 2.21 and 3.12%, respectively). Onco A solubility was greater in water, buffer solutions, and simulated gastric and intestinal fluids (817 ± 54 μg mL−1) than in oils (434 ± 25 μg mL−1). Onco A showed hydrophilic characteristics (log P < 1). The onco A content in chitosan-coated nanoparticles was 99.6% (995.8 ± 26.5 μg mL−1). In conclusion, a robust HPLC method for quantifying onco A was successfully developed, validated and applied for determining onco A solubility in different pHs, partition coefficient and nanocapsules.
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Acknowledgements
The authors thank the Brazilian research agencies for their financial support: Brazilian Ministry of Education (CAPES, PNPD-PPGNANOFARMA), Brazilian Council for Research and Development (CNPq, Grant #311232/2013-2), Brazilian Ministry of Science and Technology (MCTI), Laboratórios Associados em Nanotecnologia-UFPE (LARnano/SisNANO-MCTI, Grant # 402282/2013-2).
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Tavares, C.A., Xavier-Júnior, F.H., Pessoa, O.D.L. et al. Validation of an HPLC–UV Method for Quantifying Oncocalyxone A in Different Media and Nanocapsules. Chromatographia 82, 809–818 (2019). https://doi.org/10.1007/s10337-019-03716-x
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DOI: https://doi.org/10.1007/s10337-019-03716-x