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Table 1 Independent variables and their levels in the experimental design

From: Optimization on condition of epigallocatechin-3-gallate (EGCG) nanoliposomes by response surface methodology and cellular uptake studies in Caco-2 cells

Independent variables Symbols Code levels
-1 0 1
PC/CH (w/w) X 1 3 4 5
EGCG concentration (w/v) X 2 4 5 6
Tween 80 concentration (w/v) X 3 0.5 1 1.5
Rotary evaporation temperature (°C) X 4 30 35 40