Separation and purification of low molecular weight chitosan usi

Details Separation and purification of low molecular weight chitosan usi Separation and purification of low molecular weight chitosan usi

1997-05-30

1998-03-24

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210650, 210641, 127 34, 127 461, 127 55, 536 20, B01D 6100

Patent

active

057308764

ABSTRACT:
A multi-step membrane separation process whereby the natural polymer .alpha.-chitosan extracted from the shell of crustaceans, etc. can be simply separated and purified into low molecular weight chitosan or oligosaccharide chitosan in a high yield. A chitosan mixture of various molecular weights is reacted with an acid in the presence of enzyme while applying an ultrasonic treatment to the mixture and then, added with pure water to give an aqueous solution having a chitosan concentration of 1 to 50%. It is subjected to a continuous membrane filtration under a pressure and further to a second fractionation and separation technique employing a proper membrane according to a desired molecular weight cut-off, at least one time.

REFERENCES:
patent: 4735193 (1988-04-01), Kulprathipanja
patent: 4804750 (1989-02-01), Nishimura et al.
patent: 5550189 (1996-08-01), Qin et al.

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