Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1998-07-10
2000-10-10
Fonda, Kathleen K.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C08B 3708
Patent
active
061303216
ABSTRACT:
The present invention provides novel methods of producing chitosan having a tap density of at least about 0.4 g/ml. In one aspect of the present invention, chitosan is selected having an average molecular mass of from about one thousand Daltons to about two million Daltons; a particle size that is smaller than 20 mesh; a viscosity of at least about 1 cps, and a percentage of deacetylation of from about 65% to about 98% A measured amount of the selected chitosan is then mixed with an amount of water that is from about two to about ten times the weight of the chitosan, and an amount of an acid that is at least about 0.1% of the weight of the chitosan. The acid is preferably an organic acid. The mixture of chitosan, water and acid is then mixed to a smooth paste, dried to a moisture content of from 0% moisture to about 20% moisture, and the particle size is preferably reduced to smaller than 20 mesh. In another aspect of the invention, chitosan is provided having a tap density of at least about 0.4 g/ml and the ability to freely flow through an orifice having a circular cross section having a diameter of about 4 mm. The chitosan of the present invention is relatively odorless.
REFERENCES:
patent: 4975542 (1990-12-01), Hirayama et al.
patent: 5053113 (1991-10-01), Krepets et al.
T. Yui et al., "Molecular and Crystal Structure of the Anhydrous Form of Chitosan", Macromolecules, vol. 27, pps. 7601-7605, (Dec. 1994).
G. G. Allan, M. Peyron, "Molecular weight manipulation of chitosan I: kinetics of depolymerization by nitruos acid", Carbohydrate Research, vol. 277, pps. 257-272 (1995) month not available.
J. Li, J.F. Revol and R.H. Marchessault, Effect of Degree of Deacetylation of Chitin on the Properties of Chitin Crystallites, John Wiley & Sons, Inc. ccc 0021-8995/97/020373-08., pps. 373-380 (1997) month not available.
Derwent Abstract acc. No. 1987-119188 of JP 62-62827, Mar. 19, 1987, accessed via WEST 1.1 on Dec. 21, 1998.
Johnson Edwin Lee
Nichols Everett Junior
Fonda Kathleen K.
Vanson, Inc.
LandOfFree
High tap density chitosan, and methods of production does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High tap density chitosan, and methods of production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High tap density chitosan, and methods of production will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2257798