GH61 Polypeptide Saccharification with Dissolved Oxygen
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for saccharifying pretreated cellulosic materials to produce biofuels are not efficient enough, as they require high enzyme loads and result in high salt waste and increased costs due to the need for extensive base addition during the saccharification process.
Innovation Solution
The method involves subjecting cellulosic materials to a cellulolytic enzyme composition, a GH61 polypeptide, and catalase in a vessel with maintained dissolved oxygen levels of at least 0.5% saturation, reducing the need for base addition and enhancing saccharification efficiency by using a GH61 polypeptide to enhance hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional saccharification methods are used without oxygen addition, then the process is simpler to operate, but saccharification efficiency is low and high enzyme loads are required
Solution Approach 1:
The patent changes the oxygen concentration parameter in the reaction system from conventional zero or low levels to at least 0.5% saturation level. This parameter change activates the GH61 polypeptide's oxygen-dependent catalytic activity, dramatically improving saccharification efficiency without requiring high enzyme loads or complex process modifications
Solution Approach 2:
The patent introduces oxygen as an intermediary substance that mediates between the GH61 polypeptide and the cellulosic material. The oxygen acts as a cofactor for the GH61 polypeptide's lytic polysaccharide monooxygenase activity, enabling efficient hydrolysis of cellulose without requiring high enzyme concentrations or complex process conditions
2Productivity
If high enzyme loads are used to improve saccharification efficiency, then productivity increases, but costs increase and more base addition is required
Solution Approach 1:
By changing the oxygen concentration parameter to at least 0.5% saturation level, the patent activates the oxygen-dependent GH61 polypeptide activity. This allows achieving high saccharification efficiency with reduced enzyme loads, as the oxygen-catalyzed mechanism is more effective than conventional enzymatic hydrolysis alone
Solution Approach 2:
The patent replaces the conventional mechanical/enzymatic hydrolysis system with an oxygen-catalyzed chemical-biological system. The GH61 polypeptide with oxygen produces oxidative cleavage products more efficiently, reducing the quantity of enzymes and base required compared to traditional purely enzymatic or chemical methods
3Stability of the object's composition
If extensive base addition is performed to maintain pH during saccharification, then the process maintains stability, but salt waste increases and environmental impact worsens
Solution Approach 1:
The patent changes the oxygen concentration parameter which indirectly affects pH stability through the GH61 polypeptide's oxidative activity. This alternative mechanism maintains process stability with reduced base addition, thereby reducing salt waste generation
Solution Approach 2:
The patent converts the potential harmful effect of requiring extensive base addition into a benefit by using oxygen-catalyzed hydrolysis. The oxidative mechanism produces fewer byproducts requiring neutralization, transforming what would be a harmful waste generation issue into an environmentally friendly process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the amount of base required, decreases salt waste, and improves saccharification efficiency, making the process more cost-effective and environmentally friendly while maintaining high saccharification rates.
Implementation Method 1
subjecting the cellulosic material to a cellulolytic enzyme composition, a GH61 polypeptide and a catalase
Implementation Method 2
cellulolytic enzyme composition
Implementation Method 3
a catalase in a vessel, wherein oxygen is added to the vessel to maintain a concentration of dissolved oxygen
Implementation Method 4
catalase
Implementation Method 5
oxygen is added to the vessel to maintain a concentration of dissolved oxygen of at least 0.5% of the saturation level
Data Source
AI summary
The invention relates to methods of saccharifying a cellulosic material comprising subjecting the cellulosic material to a catalase and a cellulolytic enzyme composition comprising a GH61 polypeptide in the presence of dissolved oxygen at a concentration of greater than 10% of the saturation level. The invention also related to methods of producing desired fermentation products, such as ethanol, using a method including a saccharification step of the invention.