Statistical analysis
The data reported was obtained from triplicate measurements of samples. The results were analyzed by one–way analysis of variance (ANOVA) using SAS 9.0 (SAS Inst., Cary, NC, USA), and p < 0.05 was considered statistically significant. In addition, the data were analyzed using Principal Component Analysis (PCA) combined with VARIMAX rotation. XLSTAT software (version 2010.2.01, Addinsoft Deutschland, Andernach, Germany) was used for PCA analysis.