Development and validation method for simultaneous quantification of phenolic compounds in natural extracts and nanosystems

Sara Baptista da Silva*, Ana Oliveira, Domingos Ferreira, Bruno Sarmento, Manuela Pintado

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Introduction Sage and savoury (Salvia sp. and Satureja montana, respectively) are plants used in traditional medicine. The quality control of their herbal formulations is of paramount concern to guarantee the expected biological activity of their anti-oxidant compounds. Objective To establish a simple and effective high-performance liquid chromatographic (HPLC) method to evaluate simultaneously quercetin and rosmarinic acid, in a pure form, in natural extracts (sage and savoury), and encapsulated into chitosan nanoparticles. Methods Chromatography was performed on an RP C 18-column, in a gradient mode with a mobile phase comprising methanol:formic acid:water 92.5:2.5:5 (v/v) at a flow rate of 0.75 mL/min and at wavelength of 280 nm. Results The method was specific, linear in the range of 0.05-1 mg/mL (R2 = 1.00), precise at the intraday and interday levels, accurate (recovery rate 90.5 ± 0.6%), and robust to changes in equipment conditions. Conclusion The method established was effective for quercetin and rosmarinic acid characterisation in natural extracts and in chitosan nanoparticles, allowing the loading capacity determination, the association efficiency as well as the in vitro release.
Original languageEnglish
Pages (from-to)638-644
Number of pages7
JournalPhytochemical Analysis
Volume24
Issue number6
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Chitosan nanoparticles
  • HPLC
  • Quercetin
  • Rosmarinic acid

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