In this study we report on the solution properties of an arabinosylated XG isolated from ECPs of suspension-cultured N. plumbaginifolia cells (Nicotiana XG) and a fucosylated XG isolated from apple pomace (apple pomace XG) and compared them with those of commercially available tamarind seed XG. The changes in viscosity properties of apple pomace and N. plumbaginifolia XGs were also investigated following enzymic and chemical modification, and the role of the side-chain substituents discussed.