Optimization of Extraction and Enrichment of Steroidal Alkaloids from Bulbs of Cultivated Fritillaria cirrhosa

Table 4

Variance analysis of orthogonal experimental data.

Source of variance	Sum of square	Degree of freedom	Mean square	𝐹 value
Extraction time	472.780	2	236.390	15.176**
Ethanol concentration	1508.467	2	754.233	48.422***
Temperature	754.461	2	377.231	24.218***
Solid-liquid ratio	501.241	2	250.620	16.090**
Error	140.187	9	15.576
Total	141896.623	18

𝐹 critical value (95%)=4.25; ^∗∗𝑃<0.01; ^∗∗∗𝑃<0.001.