Functionalized Gold Particles With Uniform Size for Biolistic Delivery
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Solution Overview
Problem
Existing methods for synthesizing gold particles for biolistic delivery face challenges in achieving precise control over particle size and monodispersity, often requiring complex processes, high temperatures, and result in heterogeneous sizes, which affect delivery efficiency.
Innovation Solution
A novel bottom-up synthesis method using a reducing agent like 4-aminophenol and o-phenylenediamine at room temperature, producing monodisperse gold particles of specific sizes (300 nm-2 μm) with surface functionalization by cysteamine, enabling efficient DNA delivery without binding agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If top-down approaches (ball milling, physical grinding) are used to synthesize gold particles, then particle size can be controlled to some extent, but the particles become heterogeneous with large size distribution and rough surface
Solution Approach 1:
The patent replaces mechanical ball milling and physical grinding methods with a chemical solution-based synthesis approach. This substitution allows for precise control of particle size through chemical parameters (temperature, time, reagent concentration) rather than mechanical force, resulting in uniform particles with smooth surfaces and narrow size distributions.
Solution Approach 2:
The patent utilizes controlled changes in reaction parameters (temperature from 95-105°C, time from 1-12 hours, reagent concentrations) to precisely control gold particle formation. By optimizing these parameters, the method achieves monodisperse particles with smooth surfaces, overcoming the limitations of mechanical methods.
2Manufacturing precision
If conventional synthesis methods (Turkevich, Brust, seed-mediated, digestive ripening) are used, then particle size can be controlled within certain ranges, but they require high temperatures, complex steps, organic solvents, and cannot produce particles larger than 200 nm
Solution Approach 1:
The patent employs parameter changes by conducting the synthesis at moderate temperatures (95-105°C) rather than high temperatures, using aqueous solutions instead of organic solvents, and extending reaction time (1-12 hours) to achieve large particle sizes (300 nm-1.5 μm). This systematic parameter optimization simplifies the process while expanding the achievable size range.
Solution Approach 2:
The patent uses simple, readily available reagents (citrate, ascorbic acid, gold chloride) in an aqueous environment, replacing complex multi-step procedures, organic solvents, and specialized equipment. This approach achieves the same and better results with simpler, more accessible materials and procedures.
3Ease of manufacture
If commercially available gold particles are used, then particles can be obtained without synthesis, but they lack surface functionalization making them difficult to suspend and leading to inconsistent results
Solution Approach 1:
The patent performs surface functionalization during the synthesis process itself, rather than requiring separate post-synthesis modification steps. The gold particles are formed with citrate or ascorbic acid already bound to their surfaces, ensuring proper suspension stability and delivery consistency from the outset.
Solution Approach 2:
The patent combines the synthesis process with the surface functionalization step into a single integrated process. The reducing agent and capping agent are added together with the gold precursor, allowing simultaneous particle formation and surface modification, thereby eliminating the need for separate functionalization steps and improving reliability.
4Manufacturing precision
If complex synthesis procedures with multiple steps are used, then particle size control can be achieved, but the time, reagents, and steps required increase significantly
Solution Approach 1:
The patent merges multiple functions into a single reaction step: gold precursor reduction, particle formation, and surface functionalization all occur simultaneously in one pot. This consolidation reduces the number of steps, reagents, and time required compared to conventional multi-step procedures, while maintaining precise particle size control.
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 method achieves high yield and efficient DNA delivery with improved transformation efficiency, reducing the need for complex steps and high temperatures, and enhances biolistic delivery systems by ensuring uniform particle sizes and functionalization.
Implementation Method 1
a bottom-up synthesis reaction to form gold particles... comprises a capping agent; a reducing agent; and a gold precursor
Implementation Method 2
a bottom-up synthesis reaction to form gold particles... comprises a capping agent
Data Source
AI summary
The synthesis of several functionalized particles without the need of additional delivery agents are made possible with unique bottom-up reactions. For example, the synthesis of gold nanoparticles from 300 nm-6000 nm in diameter are optimized size for use in biolistic delivery. A catalytic reaction in a simple aqueous phase can be carried out at room temperature (between 20° C. and 24° C.). A catalyst enables production of spherical particles of desirable size and narrow size distribution. Surface functionalization assists delivery of biomolecules (DNA, protein, RNA) without the need of additional delivery agent. The gold particles system improves the consistency of the particle sizes, controls the size distribution, increases the loading capacity, and improves the number of cells transfected, thereby making the biolistic process more efficient and consistent.