Table 1.

The effect of DNA concentration in coating solution on viscosity and amount of BSA coated onto microneedles

DNA concentration (mg/ml)a	Viscosity (×10−3 Pa·s)b	Coated amount (×10−2 µg)c
0	1.23	1.02 ± 0.01
2	1.83	2.48 ± 0.01
4	2.33	3.73 ± 0.25
6	2.95	5.14 ± 0.09
8	3.96	7.44 ± 0.79

^aInclude 5% trehalose in D.I. water

^bMeasured at 20°C. Viscosity of D.I. water was 1.12×10⁻³ Pa·s

^cAverage of three measurements ± standard error of the mean