approached significancep = 0.078
The comparison between RNAiso Plus and snap freezing approached significance (mean difference: 0.273, 95% CI: −0.025 to 0.572, p = 0.078), while RNAiso Plus and RNA Later storage showed comparable purity levels (mean difference: −0.063, 95% CI: −0.361 to 0.236, p = 0.865) ( Table 1 ). 3.2.2. 260/230 absorbance ratio analysis for organic contamination The 260/230 absorbance ratio assessment, which reflects potential contamination by organic compounds, salts, and carbohydrates, showed no statistically significant differences among the three preservation methods (one-way ANOVA: F 2,33 = 1.295, p = 0.288, η 2 = 0.073).