2.4 Data processing
Test data were preliminarily evaluated and sorted using the software Excel 2010 before variance analysis and multiple data comparisons were performed through the software SPSS 21.0. The Duncan method was used to test the significance of multiple differences; thus, if P < 0.05 then a difference was considered significant while if P > 0.05 then non-significance was reported. Test data were expressed in the form mean ± standard deviation (SD).