Study on the Effect of Deep Eutectic Solvent Liquid Phase Microextraction on Quality Standard, Antitussive, and Expectorant of Sangbaipi Decoction

Table 4

Screening on DES species.

No.	Abbreviation	Hydrogen bond receptor	Hydrogen bond donor	Mole ratio	Appearance
1	DES-1	Choline chloride	Maltose	1 : 1	Incomplete separation from THF
2	DES-2	Choline chloride	Malic acid	1 : 1	Incomplete separation from THF
3	DES-3	Choline chloride	Lactate	1 : 2	Incomplete separation from THF
4	DES-4	Choline chloride	Fructose	1 : 1	Incomplete separation from THF
5	DES-5	Choline chloride	Phenol	1 : 3	Completely separated from THF
6	DES-6	Choline chloride	Glycerol	1 : 2	Incomplete separation from THF
7	DES-7	Choline chloride	Propylene glycol	1 : 2	Incomplete separation from THF
8	DES-8	Choline chloride	Xylitol	1 : 1	Incomplete separation from THF
9	DES-9	Choline chloride	Urea	1 : 2	Incomplete separation from THF
10	DES-10	Choline chloride	Acetic acid	1 : 2	Incomplete separation from THF
11	DES-11	Choline chloride	Citric acid	1 : 2	Incomplete separation from THF