Lipase Mutant Detergent for Grease Cleaning and Odor Control
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Solution Overview
Problem
Existing manual dishwashing detergents face challenges with slow lipase kinetics, poor enzyme stability during storage, and malodour issues due to lipase action on short-chain fatty acid residues in dairy soil fats, which hinder effective grease cleaning in short wash processes.
Innovation Solution
A hand dishwashing detergent composition comprising a surfactant system, a variant lipase with specific substitutions, and a cationic stabilization system, which includes anionic, amphoteric, and zwitterionic surfactants, and a cation to enhance lipase stability and prevent malodours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lipase is added to improve grease cleaning, then cleaning effectiveness is improved, but malodour issues arise due to lipase action on short-chain fatty acid residues
Solution Approach 1:
The patent modifies the lipase enzyme through site-directed mutagenesis, changing specific amino acid residues (e.g., Ser122 to Ala, Ser266 to Ala) to alter the enzyme's catalytic properties. This parameter change in the enzyme's molecular structure reduces its ability to hydrolyze short-chain fatty acid residues while maintaining grease cleaning effectiveness, thereby eliminating malodour generation.
Solution Approach 2:
The patent converts the harmful effect of lipase (malodour generation from short-chain fatty acid hydrolysis) into a beneficial outcome by engineering a mutant lipase that selectively targets long-chain triglycerides in grease while leaving short-chain fatty acids unaffected. The original harmful property is transformed into a selective catalytic advantage.
2Productivity
If lipase is used to enhance cleaning performance, then grease removal is improved, but enzyme stability during storage deteriorates
Solution Approach 1:
The patent introduces multiple amino acid substitutions (e.g., Ser122Ala, Ser266Ala, Thr41Ile) that modify the lipase's three-dimensional structure and catalytic mechanism. These parameter changes in the enzyme's primary structure enhance its conformational stability during storage while preserving its catalytic activity toward grease, resolving the stability-performance trade-off.
Solution Approach 2:
The patent creates a composite enzyme system by combining the engineered lipase with specific excipients and formulation components that stabilize the enzyme structure during storage. This composite approach maintains enzyme stability without compromising cleaning performance.
3Productivity
If conventional lipase is used in manual dishwashing, then grease cleaning is attempted, but the wash process becomes too slow for practical use
Solution Approach 1:
The patent engineers the lipase with enhanced catalytic parameters through site-directed mutagenesis, specifically improving the enzyme's turnover number (kcat) and substrate affinity (Km). These parameter optimizations enable the lipase to rapidly hydrolyze grease molecules within the short duration of manual dishwashing, making the process practically viable.
Solution Approach 2:
The patent creates a dynamic enzyme system that adapts its catalytic activity to the washing conditions. The engineered lipase maintains optimal catalytic efficiency across varying temperatures and pH levels encountered during manual dishwashing, ensuring fast and consistent grease removal throughout the wash 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
The composition provides effective grease cleaning, excellent storage stability, and low malodour risk, ensuring good and fast cleaning performance without malodour issues.
Implementation Method 1
lipase enzymes have long been proposed as potential additives to improve the grease cleaning
Implementation Method 2
a cation that acts as stabilization system for the lipase
Data Source
AI summary
A hand dishwashing detergent composition having a surfactant system a lipase at least 0.05% by weight of the composition of at least one monovalent, divalent or trivalent cation or a mixture thereof.