Chitosan Biostimulant Composition for Plant Growth
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Solution Overview
Problem
The use of chitosan in agriculture remains limited despite its potential due to its unstable antimicrobial effects and sensitivity, and existing chitosan-metal complexes are not effective when applied to plants, posing challenges in enhancing plant resistance and growth.
Innovation Solution
A composition comprising multiple chitosans with varying molecular weights and degrees of deacetylation, along with a chitosan-metal complex, is developed to provide a biofungicidal and biostimulant effect, optimized for plant treatment by protonation and partial crosslinking, allowing for improved solubility and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chitosan is used in agriculture, then plant resistance and growth can be enhanced, but the antimicrobial effects are unstable and the application remains limited
Solution Approach 1:
The patent combines multiple chitosan molecules with different molecular weights (low, medium, and high) to create a composite chitosan composition. This composite structure provides both stability through the diverse molecular composition and effectiveness by targeting multiple plant defense mechanisms simultaneously, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent systematically varies key parameters of chitosan including molecular weight distribution, degree of deacetylation (DDA), and viscosity to optimize the composition. By adjusting these parameters, the formulation achieves both stable antimicrobial effects and enhanced plant resistance, overcoming the limitations of single-parameter chitosan applications.
2Object-generated harmful factors
If chitosan-metal complexes are used, then biofungicidal effect is provided, but they are not effective when applied to plants
Solution Approach 1:
The patent extracts and eliminates the metal component from the chitosan-metal complex formulation, using only pure chitosan molecules with specific molecular weights and DDA values. This extraction removes the harmful or ineffective metal elements while retaining the beneficial biofungicidal properties of chitosan itself, making the treatment effective and safe for plant application.
3Productivity
If multiple chitosans with different molecular weights are used, then optimized biostimulant effect is achieved, but the composition complexity increases
Solution Approach 1:
The patent segments the chitosan composition into distinct molecular weight categories (low: <20,000 Da, medium: 20,000-100,000 Da, high: >100,000 Da) with specific DDA ranges for each segment. This segmentation allows for optimized biostimulant effects from each fraction while providing a structured framework that manages composition complexity through systematic classification rather than random mixture.
Data Source
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AI summary
The invention relates to a biostimulant composition for plants comprising at least two chitosans selected from: - Chitosan I - ultra-low molecular weight, viscosity less than or equal to 5 mPa.s., DDA greater than or equal to 70%, - Chitosan II - very low molecular weight, viscosity between 6 and 10 mPa.s., DDA greater than or equal to 85%, - Chitosan III - low molecular weight, viscosity between 15 and 22 mPa.s., DDA greater than or equal to 85%, - Chitosan IV - low medium molecular weight, viscosity between 30 and 45 mPa.s., DDA greater than or equal to 80%, - Chitosan V - medium molecular weight, viscosity between 65 and 100 mPa.s., DDA greater than or equal to 80%.