a plasticized composition including at least one biopolymer selected from the group consisting of poly hydrobutyrate and phb copolymers ; and a plasticizer containing a saturated or unsaturated , linear or branched c 6 - 30 fatty alcohol , and a glycerol ester of a linear or branched , saturated or unsaturated c 6 - 24 fatty acid , wherein and are present in a ratio of 100 : 0 to 75 : 25 by weight is provided .