In enzymology, a 2,1-fructan:2,1-fructan 1-fructosyltransferase is an enzyme that catalyzes the chemical reaction [beta-D-fructosyl--]m + [beta-D-fructosyl--]n [beta-D-fructosyl--]m-1 + [beta-D-fructosyl--]n⁺1 ... Wikipedia