Li Chen

US Patent:

45252181, Jun 25, 1985

Filed:

May 11, 1982

Appl. No.:

6/377078

Inventors:

Li F. Chen - West Lafayette IN
Che-Ming Yang - Clark NJ

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C13K 102

US Classification:

127 37

Abstract:

Cellulose is selectively hydrolyzed to glucose without the formation of degradation by-products by pretreating the cellulose to form soluble cellodextrins through treatment with concentrated (60-80%) solutions of zinc chloride. Zinc chloride is then separated from the mixture by extraction with attendant precipitation of the cellodextrin material which is the hydrolyzed, chemically or enzymatically to glucose.

US Patent:

44904681, Dec 25, 1984

Filed:

Apr 23, 1980

Appl. No.:

6/143146

Inventors:

Cheng Shung Gong - West Lafayette IN
Li Fu Chen - West Lafayette IN
Michael C. Flickinger - Battle Ground IN
George T. Tsao - West Lafayette IN

Assignee:

Purdue Research Foundation - W. Lafayette IN

International Classification:

C12P 706

US Classification:

435161

Abstract:

Ethanol is produced by the fermentation of xylulose using yeast under fermentative conditions.

US Patent:

43213278, Mar 23, 1982

Filed:

Dec 6, 1979

Appl. No.:

6/100816

Inventors:

Li F. Chen - West Lafayette IN
Cheng S. Gong - West Lafayette IN
George T. Tsao - West Lafayette IN

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C12P 706
C12P 102
C12N 1102
C12N 1112

US Classification:

435161

Abstract:

Spherical shaped mycelial pellets having a support core and which are suitable for biocatalytic conversion of organic compounds are produced by dissolving a cellulose derivative in a solvent to form a solution, mixing spores of a mycelial microorganism with the solution, precipitating the cellulose derivative to form porous beads containing the spores, and incubating the beads in a culture medium. Alternatively, the pellets may be produced by dissolving agar in water, mixing the agar solution with spores of a mycelial microorganism, precipitating the agar to form beads containing the spores and incubating the beads in a culture medium.

US Patent:

40900223, May 16, 1978

Filed:

Mar 21, 1977

Appl. No.:

5/779950

Inventors:

George T. Tsao - West Lafayette IN
Li Fu Chen - West Lafayette IN

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C08B 1510
C08B 1600

US Classification:

536 57

Abstract:

Porous cellulose beads are prepared by distributing droplets of a solvent mixture containing a cellulose derivative into a precipitating solution to form porous beads which are then washed and hydrolyzed to form porous cellulose beads. The porous cellulose beads, which may be cross-linked, if desired, by suitable treatment, are useful carriers to which enzymes can be immobilized. The beads may also be used for the separation of enzymes, proteins, nucleic acids and the like, or to remove metal ions from dilute mining solutions.

US Patent:

44526407, Jun 5, 1984

Filed:

May 11, 1982

Appl. No.:

6/377077

Inventors:

Li Fu Chen - West Lafayette IN
Che-Ming Yang - Clark NJ

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C13K 102

US Classification:

127 37

Abstract:

Cellulose may be quantitatively hydrolyzed to glucose without formation of degradation products by pretreatment of cellulose with zinc chloride to liquify the cellulose and thereafter hydrolyzing the cellulose with acid.

US Patent:

52903494, Mar 1, 1994

Filed:

Jul 22, 1991

Appl. No.:

7/733967

Inventors:

Li Fu Chen - West Lafayette IN

Assignee:

Purdue Research Foundation, Division of Sponsored Programs - West Lafayette

International Classification:

C08L 102

US Classification:

106168

Abstract:

The present invention relates to the production of high tensile strength, solvent-spun cellulose fiber which is stable in alkaline solutions. More particularly, the invention relates to a process in which cellulose is solubilized in a zinc chloride solution then extruded into a coagulation medium in which the cellulose fibers form. The fibers are removed from the coagulation medium, treated to remove the coagulation medium, stretched and recrystallized in water, thus forming the high tensile strength, solvent-spun cellulose fibers.

US Patent:

44800894, Oct 30, 1984

Filed:

Jun 14, 1983

Appl. No.:

6/504062

Inventors:

Li F. Chen - West Lafayette IN

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C08B 100
A61K 920
D21C 910

US Classification:

536 56

Abstract:

Modified cellulose products for use as carrier vehicles in forming cosmetics, pharmaceutical preparations, insecticides, etc. are prepared by treating a minimum weight ratio of about 10:1 of fibrous cellulosic material with an alkali metal or alkaline earth metal hypohalite (e. g. sodium hypochlorite) at a temperature of from about 15. degree. to 60. degree. C. for a period of time sufficient to render the material non-fibrous (i. e. pH drop to about 6 or less), filtering and washing obtain the desired product.

US Patent:

44277750, Jan 24, 1984

Filed:

Sep 10, 1981

Appl. No.:

6/300744

Inventors:

Li F. Chen - West Lafayette IN
Cheng S. Gong - West Lafayette IN
George T. Tsao - West Lafayette IN

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

C12P 706
C12P 102
C12N 1110
C12M 140

US Classification:

435161

Abstract:

Spherical shaped mycelial pellets suitable for use in the biocatalytic conversion of organic compounds are prepared having a rigid spherical core surrounded by a porous webbed layer of structural integrity of a mycelial microorganism. The webbed layer is preferably separated from the core by a substantial void space and is attached to the core by a portion of the mycelium of the microorganism. The core may be composed of a cellulose derivative or agar. The pellets are prepared by forming a solution of a cellulose derivative or agar, mixing spores of a mycelial microorganism with the solution, precipitating the celluose derivative or agar to form beads containing the spores and incubating the beads in a culture medium.