US2009099347A1PendingUtilityA1

Chitosan production

56
Assignee: CARGILL INCPriority: Apr 2, 2002Filed: Dec 19, 2008Published: Apr 16, 2009
Est. expiryApr 2, 2022(expired)· nominal 20-yr term from priority
Inventors:James R. TrinkleKi-Oh HwangWeiyu Fan
C12P 19/26C08B 37/003
56
PatentIndex Score
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Cited by
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Claims

Abstract

The invention provides a method of producing chitosan using pressures greater than 0 PSIG. The invention also provides fungal chitosan compositions.

Claims

exact text as granted — not AI-modified
1 . A composition comprising fungal chitosan, wherein the fungal chitosan has a deacetylation level of greater than 85% and an average molecular weight of greater than 80,000. 
   
   
       2 . The composition according to  claim 1 , wherein the fungal chitosan has a purity greater than 85%. 
   
   
       3 . The composition according to  claim 1 , wherein the fungal chitosan has a purity greater than 90%. 
   
   
       4 . The composition according to  claim 1 , wherein the fungal chitosan has a deacetylation level greater than 90%. 
   
   
       5 . The composition according to  claim 1 , wherein the average molecular weight of the fungal chitosan is greater than 80,000 and less than about 258,933. 
   
   
       6 . The composition according to  claim 1 , wherein the fungal chitosan is free from components from insect shells, crustacean shells, and mollusk shells. 
   
   
       7 . A composition comprising chitosan, wherein the chitosan is made by a method comprising:
 reacting a fungal biomass with a caustic at a pressure greater than 0 PSIG for at least 4 hours, thereby producing the chitosan, wherein the average molecular weight of the chitosan is greater than 80,000 and less than about 258,933.   
   
   
       8 . The composition according to  claim 7 , wherein the method further comprises separating the chitosan from the caustic. 
   
   
       9 . The composition according to  claim 7 , wherein the fungal biomass is reacted at a pressure greater than 5 PSIG. 
   
   
       10 . The composition according to  claim 7 , wherein the fungal biomass is reacted at a temperature greater than 115° C. 
   
   
       11 . The composition according to  claim 7 , wherein the fungal biomass is reacted at a temperature greater than 125° C. 
   
   
       12 . The composition according to  claim 7 , wherein the fungal biomass is reacted for at least 6 hours. 
   
   
       13 . The composition according to  claim 7 , wherein the caustic is from about 5% to 40% by weight percent. 
   
   
       14 . The composition according to  claim 7 , wherein the caustic is from about 15% to 30% by weight percent. 
   
   
       15 . The composition according to  claim 7 , wherein the fungal biomass is reacted for greater than 10 hours. 
   
   
       16 . The composition according to  claim 7 , wherein the fungal biomass is reacted at a pressure greater than 15 PSIG. 
   
   
       17 . The composition according to  claim 7 , wherein the fungal biomass comprises  Aspergillus  biomass. 
   
   
       18 . A composition comprising chitosan, wherein the chitosan is made by a method comprising:
 reacting the fungal biomass with a caustic at a pressure greater than 0 PSIG at a temperature greater than 125° C. for at least 1 hour, thereby producing chitosan, wherein the average molecular weight of the chitosan is greater than 80,000 and less than about 258,933.   
   
   
       19 . The composition according to  claim 18 , wherein the fungal biomass is reacted for greater than 12 hours. 
   
   
       20 . The composition according to  claim 18 , wherein the fungal biomass comprises  Aspergillus  biomass.

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