Optimization of Vacuum Microwave-Mediated Extraction of Syringoside and Oleuropein from Twigs of Syringa oblata

Figure 4

Response surface plots showing the effects of variables on yields of syringoside and oleuropein: (a) interaction between microwave irradiation time and liquid-solid ratio on the extraction yield of syringoside; (b) interaction between microwave irradiation time and microwave irradiation power on the extraction yield of syringoside; (c) interaction between liquid-solid ratio and microwave irradiation power on the extraction yield of syringoside; (d) interaction between microwave irradiation time and liquid-solid ratio on the extraction yield of oleuropein; (e) interaction between microwave irradiation time and microwave irradiation power on the extraction yield of oleuropein; (f) interaction between liquid-solid ratio and microwave irradiation power on the extraction yield of oleuropein.

(a)

(b)

(c)

(d)

(e)

(f)