Cationic β-Cyclodextrin Silver Nanoparticles Green Synthesis
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Solution Overview
Problem
The low water solubility of β-cyclodextrin limits its practical applications, and existing methods for synthesizing silver nanoparticles often use toxic chemicals, posing environmental and health concerns.
Innovation Solution
The development of cationic β-cyclodextrin (C-β-CD) and its functionalization with silver nanoparticles (C-β-CD/AgNPs) using a green synthesis method, where C-β-CD serves as both a reducing agent and stabilizer, enhancing water solubility and stability of the nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If β-cyclodextrin is used directly, then the cavity structure is retained, but water solubility is low
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of β-cyclodextrin through quaternary ammonium group introduction. This chemical modification changes the physical and chemical parameters of the molecule, transforming it from neutral to cationic, which significantly improves water solubility while preserving the essential cavity structure needed for inclusion complex formation.
Solution Approach 2:
The patent creates a composite material system by combining β-cyclodextrin with quaternary ammonium groups to form cationic β-cyclodextrin. This composite approach integrates the cavity structure of cyclodextrin with the water-solubility-enhancing properties of quaternary ammonium groups, achieving both structure retention and solubility improvement simultaneously.
2Productivity
If chemical reduction method is used to synthesize AgNPs, then particle synthesis is efficient, but toxic chemicals are used
Solution Approach 1:
The patent applies self-service by using cationic β-cyclodextrin to perform multiple functions simultaneously: it acts as both the reducing agent that converts silver ions to silver nanoparticles and the stabilizing agent that prevents aggregation. This eliminates the need for separate toxic reducing agents and stabilizers, achieving green synthesis while maintaining efficiency.
Solution Approach 2:
The patent extracts and eliminates toxic chemicals from the synthesis process by replacing conventional toxic reducing agents (like sodium borohydride) and stabilizers with biocompatible cationic β-cyclodextrin. This extraction of harmful substances achieves green synthesis while preserving the efficiency of nanoparticle formation.
3Stability of the object's composition
If conventional stabilizers are used for AgNPs, then stability is achieved, but environmental harm occurs
Solution Approach 1:
The patent uses cationic β-cyclodextrin as an intermediary substance that mediates between silver ions and the environment. It stabilizes the silver nanoparticles through its cationic charge and hydrophilic properties, preventing aggregation and providing environmental compatibility. This intermediary role replaces harmful conventional stabilizers with a biocompatible alternative.
4Quantity of substance
If β-cyclodextrin is modified to improve solubility, then water solubility increases, but structural complexity increases
Solution Approach 1:
The patent applies local quality by introducing quaternary ammonium groups at specific positions on the β-cyclodextrin structure (primarily at the secondary hydroxyl groups). This localized modification approach improves water solubility without requiring complete structural redesign, maintaining the overall cyclodextrin framework and cavity structure while adding solubility-enhancing functional groups only where needed.
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 cationic β-cyclodextrin functionalized silver nanoparticles demonstrate improved stability, small particle size, and effective bacteriostatic properties, with potential applications in antibiosis, drug delivery, and catalysis.
Implementation Method 1
cyclodextrins containing numerous hydroxyl groups in the structure may be used as a reducing agent to reduce metal salts under alkaline conditions
Implementation Method 2
can be adsorbed on the surface of metal nanoparticles in the synthesis of metal particles, effectively stabilizing metal nanoparticles and preventing aggregation
Data Source
AI summary
The present invention provides a cationic β-cyclodextrin and a preparation method and uses thereof, as well as a cationic β-cyclodextrin functionalized silver nanoparticles and a preparation method and uses thereof. The cationic β-cyclodextrin of the present invention is introduced with an amine group and quaternary ammonium groups, while retaining the special structure and properties of cyclodextrin itself. The amine group contained in the structure plays a role in reducing and complexing Ag+ in the synthesis of AgNPs, and plays a certain role in stabilizing nanoparticles and forming a complex in combination with quaternary ammonium groups.