This paper presents a review of the principle and technologies in reactive extrusion and
their application in starch modification and preparation of starch derivatives, such as
starch graft copolymers, glycosides, cationic starch, or oxidized starch. The applications
of reactive extrusion in producing other biopolymers are also touched. Flexibility
and efficiency of reactive extruders as reactors for biopolymers are particularly noteworthy.