Biodegradable Pheromone Microparticles via pH-Induced Gelation
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Solution Overview
Problem
Existing pheromone delivery systems for insect control are costly, difficult to implement, and unstable, with limitations in encapsulation efficiency and potential environmental pollution, particularly due to the use of toxic chemicals and volatile solvents, and they fail to provide controlled, gradual release of pheromones without external intervention.
Innovation Solution
The development of biodegradable microparticles composed of natural substances, using alkali-swellable and hydrophobically modified alkali-swellable emulsion copolymers to create a solid shell around a core of wax and pheromone mixture, allowing for controlled release through pH-induced surfactant behavior and hardening, protecting pheromones from oxidation and enabling gradual release without external intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coacervation technologies are used to encapsulate pheromones, then pheromone encapsulation is achieved, but toxic chemicals (formaldehyde, glutaraldehyde) are required for cross-linking which pose pollution problems
Solution Approach 1:
The patent removes the toxic cross-linking agents (formaldehyde, glutaraldehyde) from the encapsulation process by using a physical gelation mechanism instead. The ionogenic groups in the polymer form gel structures through ionic interactions with divalent cations, eliminating the need for harmful chemical cross-linkers while maintaining encapsulation stability.
Solution Approach 2:
The patent changes the gelation mechanism from chemical cross-linking to physical gelation through parameter changes. By controlling pH and adding divalent cations (Ca2+, Mg2+), the ionogenic groups in the polymer undergo conformational changes that lead to gel structure formation, providing a non-toxic alternative to chemical cross-linking.
2Reliability
If conventional encapsulation methods are used, then pheromone delivery is achieved, but the systems are costly and difficult to implement
Solution Approach 1:
The patent uses readily available, inexpensive materials including commercial ionogenic polymers, common divalent cations, and standard pheromones. The encapsulation process uses simple equipment (magnetic stirrer, pH meter) and requires no specialized facilities, making the system cost-effective and easy to implement compared to conventional methods.
Solution Approach 2:
The patent divides the encapsulation process into simple, sequential steps: polymer dissolution, pH adjustment, cation addition, and particle formation. Each step uses simple operations that can be performed with basic laboratory equipment, reducing implementation complexity while maintaining encapsulation effectiveness.
3Productivity
If pheromones are released through porous membranes, then diffusion is achieved, but control over release rate is difficult and substantial pheromone is adsorbed on particle surface releasing immediately
Solution Approach 1:
The patent creates a composite particle structure where the polymer matrix contains ionogenic groups that interact with divalent cations to form a gel network. This composite structure provides controlled porosity and prevents excessive surface adsorption, enabling sustained release without the need for separate porous membrane layers.
Solution Approach 2:
The patent creates different regions within the particle with different properties. The gel structure formed by ionogenic groups and divalent cations creates a controlled microenvironment that regulates pheromone release locally, preventing immediate surface release while maintaining overall particle stability.
4Ease of manufacture
If volatile solvents are used in polymer capsule technologies, then particle formation is achieved, but the solvents are harmful to environment and users and traces can negatively affect pheromone attractive power
Solution Approach 1:
The patent removes volatile organic solvents from the particle formation process by using an aqueous-based gelation mechanism. The particles are formed through ionic interactions in water, eliminating the need for harmful solvents like dichloromethane while maintaining particle formation effectiveness and preserving pheromone attractive power.
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 results in stable, biodegradable, and cost-effective pheromone delivery systems with adjustable particle size for controlled release kinetics, protecting pheromones from oxidation and ensuring gradual release, thus improving the practicality and efficacy of pheromone-based crop treatment technologies.
Implementation Method 1
The distinctive feature of the invention lies in the use of molecules that, under certain pH conditions, play the part of surfactant and, under other pH conditions, harden and become the solid shells of particles.
Implementation Method 2
protecting pheromones from oxidation and enabling gradual release without external intervention
Implementation Method 3
capable of releasing the pheromones in a sustained manner
Data Source
AI summary
The present invention is directed towards microparticles consisting of a solid shell made of polymer, in particular an acrylic polymer, surrounding a core comprising a mixture of oil and wax and also pheromone. The present invention is also directed towards a production process and the use of an aqueous suspension of such microparticles containing pheromones comprising fatty chains, such as lepidopteran pheromones, and which are capable of releasing the pheromones in a sustained manner.