Table 4: Functional groups chosen to represent the chemical structure of the solutes, caffeine and ferulic acid, and the solvents, ethyl lactate and water.

Caffeine		Ferulic acid		Ethyl lactate		Water
Group	Number of groups	Group	Number of groups	Group	Number of groups	Group	Number of groups
c-C=C	1	CH=CH	1	CH3	2	H2O	1
c-CON-CH3	2	ACH	3	CH2	1
CH3N	1	AC	2	CH	1
ACNH	1	ACOH	1	OH (s)	1
		COOH	1	COO	1
		CH3O	1