Typically,
P(3HB-co-3HV) copolymers containing 0 to 30 mol
% of 3-hydroxyvalerate are produced, and that fraction can
be controlled by varying the ratio of glucose to propionic
acid in the feed. 18,19 Copolymers having higher fraction (up
to 90 mol %) of 3-hydroxyvalerate can be produced from
butyric and pentanoic acids,38 but production on an industrial
scale has not been attempted