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1: What is pullulan:
Pullulan is naturally occurring, as a cell wall component for organisms such as fungus
  Aureobasidium pullulans.Pullulan is produced from starch by the fungus Aureobasidium pullulans.As an edible, bland and tasteless polymer, the chief commercial use of pullulan is in the manufacture of edible films that are used in various breath freshener or oral hygiene products such as Listerine Cool Mint PocketPaks. As a food additive, it is known by the E number E1204.
2: Chemistry:
CAS number [9057-02-7];
Molecular formula (C6H12O5

Pullulan is a polysaccharide polymer consisting of maltotriose units, also known as
α-1,4- ;α-1,6-glucan. Three glucose units in maltotriose are connected by an α-1,4 glycosidic bond, whereas consecutive maltotriose units are connected to each other by an α-1,6 glycosidic bond.
3: Why pullulan:
The reason that we choose pullulan is due to
following factors:
1): P
ullulan is more natural, involving no toxic chemicals, much less environment polluting in its production process 2): Pullulan possesses more potential for price reduction when produced in mass, because the fermentation technology used is widely used and very mature.3): Pullulan film is 300 times stronger oxygen barrier than HPMC film, 9 times stronger than gelatin film
4): Pullulan is much more inert than gelatin or HPMC, so there is no interaction with products it intended to deliver.
4: How pullulan is made:
Commercially, Pullulan is from fermentation process.
Aureobasidium pullulans grow on the carbohydrate substrate (sugar or starch. Then Aureobasidium pullulans is harvested. Followed by rupture the cell  with either enzyme or physical force. Pullulan then is extracted using simple water extraction process. There are no environment damaging waste, or carcinogenic material used.