Surface Physicochemical Characterization of Shepherd’s Purse (Capsella bursa-pastoris) by Inverse Gas Chromatography

Abstract

Shepherd’s purse (Capsella bursa-pastoris) is one of the plants widely utilized in conventional medicine and can grow in different parts of the world. The determination of the surface properties of a solid material is extremely important for the industrial use of the material and the improvement of material properties. Therefore, in this study, this plant was used as a stationary phase, and its surface characterization was performed by inverse gas chromatography technique. In this context, firstly, the plant was prepared with several pretreatments to be used in the experimental tests. The V_N values were found from the retention data obtained by passing organic solvents over the plant filled into the chromatographic column in the temperature range of 303.2–328.2 K and linear retention diagrams were drawn. The γ_S^D of the plant was calculated according to Schultz, Dorris-Gray, and Donnet-Park methods, and the suitability of the methods was compared. The 〖∆G〗_A^S values were calculated with the data obtained from the Schultz method, and the 〖∆H〗_A^S values were calculated using these data. The acidity and basicity of the plant surface were examined. According to the K_D⁄K_A value (0.93), it was determined that the surface of the plant was acidic.