Table 1. Total and Interfacial Concentrations of Glycine at the Oil and Air Interfaces, with the Concentration Ratio Showing Enhancement and Depletion at the Oil and Air Interfaces, Respectively.

system	total conc (g/kg)	interface conc (g/kg)	conc ratio
oil	250	303	1.26
air	250	136	0.54
oil	307	386	1.21
air	307	156	0.51