Table 2. Comparison of the RNA extraction kits for RNA concentration and 260/280 ratio.

Extraction method	RNA concentration (ng/µl)	260/280 ratio
ZR RNA MiniPrep	9.70 ± 3.92a	1.98 ± 0.27c
TRIzol Reagent	37.5 ± 12.12b	1.63 ± 0.04d
GENEzol Reagent	28.45 ± 8.68b	1.71 ± 0.04e

^{a, b} Very significant difference (P<0.01). ^c–e Significant difference (P<0.05).