Alpha-Amylase Variant for Cold-Water Starch Removal
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Solution Overview
Problem
Current detergents face challenges in maintaining effective stain removal and enzyme activity at low temperatures, particularly in cold water washing cycles, where alpha-amylases' performance is compromised, leading to incomplete stain removal.
Innovation Solution
Development of a cleaning composition featuring a variant of alpha-amylase with specific substitutions at positions G477, G304, W140, W189, D134, E260, F262, W284, W347, W439, and G476, along with additional substitutions at N195, V206, and Y243, which maintains alpha-amylase activity and enhances wash performance at temperatures between 5-35°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional alpha-amylases are used in cold water washing, then the detergent composition can be used for low temperature washing, but the enzyme activity and wash performance are compromised
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of alpha-amylase through specific substitutions (e.g., G477E, G304R, W140Y, W189E, D134E, E260Q, F262P, W284D, W347H, W439R) to alter the enzyme's physical and chemical properties. These changes enable the enzyme to maintain optimal activity at lower temperatures while preserving its catalytic function, thus resolving the contradiction between low washing temperature and maintained enzyme activity
Solution Approach 2:
The patent creates a composite enzyme structure by combining multiple amino acid substitutions within the alpha-amylase protein. This composite modification approach integrates various functional changes at different positions in the protein sequence, resulting in an enzyme with enhanced cold-water performance that maintains stability and activity across the 5-35°C temperature range
2Reliability
If alpha-amylase variants with improved cold water performance are developed, then wash performance at low temperatures is enhanced, but the enzyme complexity and development effort increase
Solution Approach 1:
The patent applies local quality by introducing specific amino acid substitutions at targeted positions within the alpha-amylase structure rather than modifying the entire enzyme. Each substitution (e.g., at positions 477, 304, 140, 189, 134, 260, 262, 284, 347, 439) addresses specific functional requirements for cold water stability and activity, allowing localized optimization without overwhelming structural complexity
Solution Approach 2:
The patent employs partial action by implementing a selective set of amino acid substitutions rather than comprehensive modification of the entire enzyme structure. The specific combination of substitutions at key positions provides sufficient enhancement for cold water performance without unnecessary complexity, achieving the desired wash performance improvement with a focused, manageable set of modifications
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 variant alpha-amylase composition ensures improved wash performance and stability at low temperatures, effectively removing starchy stains even in cold water conditions, surpassing the performance of parent alpha-amylases.
Implementation Method 1
Alpha-amylases (alpha-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1) constitute a group of enzymes, which catalyse hydrolysis of starch and other linear and branched 1,4-glucosidic oligo- and polysaccharides
Data Source
AI summary
The present invention relates to cleaning compositions comprising variants of an alpha-amylase and methods of treating surfaces such as textiles with aqueous liquor comprising such compositions, especially at low temperatures.