Optimization of Formulation and Operating Parameters for Ginkgo biloba Extract Nanosuspension by Wet Ball Milling Using a Box–Behnken Design

Table 1

Codes and actual variables and their levels in BBD.

Codes	Variables	Level 1 (-1)	Level 2 (0)	Level 3 (+1)
A	GBE concentration (g/L)	3.3	6.6	13.2
B	Milling speed (m/s)	6	8	10
C	Milling time (h)	0.5	1	2
D	SDS concentration (g/L)	0.1	0.5	1