Ch3

Poly(ß-hydroxybutyrate- co-ß-hydroxyvalerate)

Pullulan Pullulan, a biodegradable polysaccharide first described in 1959 [34], 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 [35]. 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 [36]. 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]:

Was this article helpful?

0 0
Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment