Robust PLS Prediction Model for Saikosaponin A in Bupleurum chinense DC. Coupled with Granularity-Hybrid Calibration Set

Table 2

Elution gradient used in the HPLC method.

Time/min	ACN (v/v)	Water (v/v)
0–50	25–90	75–10
50–55	90	10
55–60	25	75
60–67	25	75