the present invention provides a process for the manufacture of a product essentially containing amylose from vegetable materials , in particular from peas . to this end , the flour is mixed with an alkaline decomposing agent , and then a separation into a liquid protein phase and a solid phase containing polysaccharide is performed . the solid phase is then re - suspended and subjected to several sifting steps , followed by at least one washing step and subsequently a drying step . from such polysaccharide material , in particular from amylose , any kind of moisture - resistent , flexible , and in particular biodegradable articles can be produced by means of conventional plastics technologies , in particular the injection molding technique . a particular advantage of the present invention resides in the fact that the thermoplastic polysaccharide material , which is produced from renewable raw materials , can also be processed into sheets which in turn can then be worked with conventional plastics techniques .