Pullulan Pullulan, a biodegradable polysaccharide first described in 1959 , is a water-soluble extracellular neutral glucan synthesized by the fungus Aureobasidium pullulans, more commonly referred to as Pullularia pullulans. The structure of pullulan is proposed to consist predominantly of maltotriose units linked via a-1,6-glycosidic bonds . Pullulan containing 5-7% maltotetraosyl units has been reported for several strains of A. pullulans. Pullulan can be solution cast from aqueous media, although it has been difficult to process by conventional melt-processing techniques . According to the digestion test of internal enzymes and the feeding test of rats, pullulan is an indigestible polysaccharide such as cellulose or pectin. Pullulan, like starch, begins to degrade thermally at approximately 250°C, then carbonizes, and generates neither extreme heat nor toxic gas [36, 37]:
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