Table 1

Independent variables and their levels in the experimental design
Independent variables Symbols Code levels
-1 0 1
PC/CH (w/w) X1 3 4 5
EGCG concentration (w/v) X2 4 5 6
Tween 80 concentration (w/v) X3 0.5 1 1.5
Rotary evaporation temperature (°C) X4 30 35 40

Luo et al.

Luo et al. Nanoscale Research Letters 2014 9:291   doi:10.1186/1556-276X-9-291

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