2.6. Statistics
All statistical analyses were performed with the SPSS (version
13.0; USA). All values were expressed as mean ± SD and analyzed
by SPSS for Win 13.0 software. One-way ANOVA following Tukey’s
test was used to determine whether results of treatments were
significantly different from the control group (p < 0.05). In addition,
principal component analysis (PCA) was used to define the most
important parameters, which could be used as key factors for individual
variations using Statistic 6.0