2.9. Statistical analysis
All analytical values represent the mean of three analyses performed in at least two different experiments. Data was analysed using one-way analysis of variance (P < 0.05) to determine the differences between the values of the tested compounds. For significant results, Tukey’s Honestly Significant Difference test was used. Prior to building the classifying model functions, an exploratory analysis (cluster analysis) was carried out to observe data trends. Statistica 10.0 software (StatSoft, Krakow, Poland) was used for the analysis.