2.9. Statistical analysis
Results
were expressed as means ± standard deviations. The data were statistical
analysis using the software package SPSS 17.0 for Windows (SPSS Inc.,
Chicago, IL). Differences between means were determined by analysis of
variance (ANOVA) with Duncan multiple range test. Differences were
considered statistically significant at P < 0.05. All
tests were performed in triplicate.