| ABTS | 2,2-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid |
| BBD | Box-Behnken design |
| DPPH | 2,2-diphenyl-1-picrylhydrazyl |
| RSM | Response surface methodology |
| SLPF | stem and leaf of P. notoginseng flavonoid |
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