Table 1. Factors and levels of orthogonal experiment of P. orientale leaf extraction.

Levels	Factors
	Extraction time (A)	Extraction temperature(B)	Solid to liquid ratio(C)
1	6h	60°C	1∶10 (g:mL)
2	8h	70°C	1∶15 (g:mL)
3	10h	80°C	1∶20 (g:mL)