Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing oxygen-containing organic compound
Reexamination Certificate
2011-07-05
2011-07-05
Saidha, Tekchand (Department: 1652)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing oxygen-containing organic compound
C435S014000, C435S209000
Reexamination Certificate
active
07972826
ABSTRACT:
Provided are methods of liquefaction, saccharification and fermentation of pre-treated lignocellulosic biomass in production of bioethanol. Addition of PEG or surfactant is effective to enhance cellulase hydrolysis yields at high dry matter (>20%) at surprisingly low concentrations compared with comparable results in low dry matter hydrolysis. This effect is most pronounced at comparatively low cellulase loading <7 FPU (g DM)−1. At high dry matter content, cellulase enzyme consumption can be reduced, without loss of hydrolysis yield, by addition of small quantities of PEG or surfactant.
REFERENCES:
patent: 4409329 (1983-10-01), Silver
patent: 5817212 (1998-10-01), Jobbins et al.
patent: 2003/0124710 (2003-07-01), Borch et al.
patent: WO2005067531 (2005-07-01), None
patent: WO2006056838 (2006-06-01), None
patent: WO2007094643 (2007-01-01), None
Kristensen et al, Use of surface active additives in enzymatic hydrolysis of wheat straw lignocelluloses, Enzyme and Microbial Technology 40, 2007, 888-895.
Lu et al, Cellulase Absorption and and evaluation of enzyme recycle during hydrolysis and steam-exploded softwood residues, Appl. Biochem and Biotech, vol. 98-100, 2002.
Eriksson et al; mechanism of surfactant effect in enzymatic hydrolysis and lignocelluloses, Enzyme and Microbial Tech, 31, 2002, 353-364.
Börjesson et al, Enhanced enzymatic conversion of softwood lignocelluloses by poly(ethylene glycol) addition, Enzyme and Microbial Tech. 40, 2007, 754-762.
Börjesson et al; Effect of polyethylene glycol on enzymatic hydrolysis and absorption of cellulose enzymes to pretreated lignocelluloses, Enzyme and Microbial technology 41, 2007, 186-195.
Dasari et al: The effect of particle size on hydrolysis reaction rates and rheological properties in cellulosic slurries. Appl. Biochem, and Biotech, vol. 136-140, 2007.
Tabka et al; Enzymatic saccharification of wheat straw for bioethanol production by a combined cellulase xylanase and feruloyl esterase treatment, Enzyme and microbial tech 39, 2006, 897-902.
Lee et al: Effect of surfactants on ethanol fermentation using glucose and cellulosic hydrolyzates, Biotech. Letters, vol. 18(3), 1996, 299-304.
Ballesteros et al; Effect of Surfactants and zeolites on simultaneous saccharification and fermentation of steam-exploded poplar biomass to ethanol, Appl. Biochem. and Biotech, vol. 70-72, 1998.
Alkasrawi et al.; The effect of Tween-20 on simultaneous saccharification and fermentation of softwood to ethanol, Enzyme and Microbial Technology 33 (2003) 71-78.
Helle et al.; Effect of Surfactants on Cellulose Hydrolysis, Biotechnology and Bioengineering 42: 611-617, 1993.
Park et al.; Effects of nonionic surfactant on enzymatic hydrolysis of used newspaper, Biotechnology and Bioengineering 39: 117-120, 1992.
Ooshima et al.; Enhancement of enzymatic hydrolysis of cellulose by surfactant, Biotechnology and Bioengineering 28: 1727-1734, 1986.
Kaya et al.; Influence of surfactants on the enzymatic hydrolysis of xylan and cellulose, Tappi Journal 78:150-157, 1995.
ISA, International Search Report, European Patent Office, 2009.
IPEA, International Preliminary Report on Patentability, European Patent Office, 2010.
Jørgensen Henning
Larsen Jan
Casad, Jr. Robert C.
Inbicon A/S
Saidha Tekchand
LandOfFree
Methods for reducing enzyme consumption in second generation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods for reducing enzyme consumption in second generation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for reducing enzyme consumption in second generation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2637727