Structure and degree of polymerisation of fructooligosaccharides present in roots and leaves of Stevia rebaudiana (Bert.) Bertoni

► Fructooligosaccharides from roots and leaves of Stevia rebaudiana. ► Isolation procedure and structural analysis. ► Determination of degree of polymerisation (DP). ► Characterisation by matrix-assisted laser desorption/ionisation mass spectrometry and electrospray ionisation mass spectrometry.