Caroline Magnani Spagnol has completed her degree in Biochemistry Pharmacy. She has done her Master’s in Pharmaceutical Sciences and currently pursuing her PhD from São Paulo State University, Brazil. She has published more than 8 papers in reputed journals with 485 reads.
Introduction: The caffeic acid (CA) is a phenolic compound with powerful antioxidant activity. The emulsions are widely used by the consumer; however, preparations developed in the form of dry film are presented as a technological alternative. Aim: The aim of this work was to develop and validate a HPLC method for determination of CA in cosmetic formulations. Methods: HPLC analysis was performed on a Waters™ HPLC with UV-Vis detector, water column RP18 (XDB, 4.6 x 250 mm, 5 μm) ; water: ethanol 60:40 (v/v); pH 2.5 adjusted with acetic acid as mobile phase and flow rate of 0.7 mL min-1 at 325 nm. Results: The method was linear over the concentration range of 10-60 μg/mL (r2=0.9999) with limits of detection and quantification of 1.44 and 4.38 μg/mL, respectively. In the specificity, the peaks obtained with the mobile phase and placebo solution showed no interference in the analysis. Method specificity was also checked by comparing the chromatograms obtained from CA solution in forced degradation procedure and it showed that degradation products did not affect the CA peak. The method was robust, since small changes in the method did not cause significant variations in results. The retention time of CA was 5.9 min. Conclusion: The results indicated that the HPLC method presented linearity, selectivity, accuracy, precision, robustness, adequate detection and quantification limits; with the advantage of having a shorter time compared to existing methods and does not use buffer in the mobile phase. Excellent conditions were chosen in order to obtain a simple and fast HPLC method which can be easily applied in routine analysis of CA in cosmetic formulations.
Barbora Smidova has completed her Master’s degree at Charles University in Prague, Faculty of Pharmacy in 2013. Nowadays, she is in the third year of her PhD study at the same University, Department of Analytical Chemistry. She works at Research and Breeding Institute of Pomology Holovousy, Department of Genebanks as a Junior Researcher. She acquired experiences during two months internship in New Zealand (Massey University) and four months in Portugal (University of Porto). She is author of 1 and a co-author of 5 research papers.
Principal importance of highbush blueberries is mainly in high biological value of fruits. Anthocyanins are the most important pigments of blueberries. Significant property of anthocyanins is their antioxidant activity, which plays important role in prevention of many diseases. A new high-performance liquid chromatography method using alternative pentafluorophenyl fused-core stationary phase has been developed and used for rapid separation of 22 highbush blueberry anthocyanins. High efficiency separation of anthocyanins was achieved on the fused-core column Kinetex PFP, 150 x 4.6 mm (particle size 2.6 µm) protected by precolumn 5 x 4.6 mm. Linear gradient elution with a mobile phase of water solution of 2% formic acid and acetonitrile at a flow rate of 1.0 ml/min was used. The column operated at 50°C and detection wavelength was set at 520 nm. Blueberries were homogenized and extracted with pure methanol, acidified by formic acid using ultrasound water bath for 20 min and immediately filtrated (PTFE, 0.45 μm). 5 µL of sample extract was directly injected into the HPLC system. The developed method has shown efficient separation of 22 anthocyanins in total run time of 21 min. The potential of pentafluorophenyl phase was demonstrated for a wide range of anthocyanins varying in glycosylation and acylation patterns found in highbush blueberries. Described method was applied to 22 highbush blueberry cultivars. Fluorinated stationary phase showed an alternative and complementary separation approach providing unique aromatic and polar selectivity in comparison with common C-18 reversed phases