Optimization of Gentisides Extraction from Gentiana rigescens Franch. ex Hemsl. by Response Surface Methodology

Table 3

Optimum conditions and predicted and experimental values of the responses at actual extraction conditions.

	Extraction temperature (°C)	Extraction time (h)	Solvent-material ratio (mL/g)	Yield of gentisides (%)
Optimum conditions	74.33	3.4	10.21	99.24 (predicted)
Modified conditions	75	3.5	10	98.61 ± 0.61 (actual)