Ultrasmall Gelatin Nanoparticles via TPP Crosslinking
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Solution Overview
Problem
Existing methods for synthesizing gelatin nanoparticles often produce particles larger than 50 nm, which tend to accumulate on the surface of tumors rather than penetrating deeply into tumor tissue.
Innovation Solution
A method involving a first desolvation to form gelatin strands, followed by pH adjustment and cross-linking with tripolyphosphate (TPP) to form gelatin-TPP-gelatin bridges, and a second desolvation in a TPP-Ethanol:Acetone mixture to produce ultrasmall gelatin nanoparticles sized around 10 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional two-step desolvation method with acetone and glutaraldehyde crosslinking is used, then gelatin nanoparticles can be synthesized, but the particle size is typically 200-300 nm which is too large for deep tumor penetration
Solution Approach 1:
The patent changes multiple parameters including using tripolyphosphate (TPP) instead of glutaraldehyde as crosslinking agent, modifying the desolvation solvent system to include ethanol-acetone-water mixtures, and adjusting pH conditions during synthesis. These parameter changes enable precise control of nanoparticle size in the 10-50 nm range while maintaining stable particle formation.
Solution Approach 2:
The patent performs preliminary desolvation to form gelatin strands before crosslinking with TPP, and conducts pH adjustment to charge and separate strands prior to nanoparticle assembly. This preliminary preparation of gelatin strands ensures controlled self-assembly into ultrasmall nanoparticles with narrow size distribution.
2Length of moving object
If nanoparticle size is reduced to below 50 nm for deep tumor penetration, then tumor penetration capability is improved, but conventional methods cannot produce particles of this size
Solution Approach 1:
The patent uses tripolyphosphate (TPP) as a crosslinking intermediary that forms bridges between gelatin strands during desolvation. TPP enables controlled crosslinking that stabilizes ultrasmall nanoparticle structures below 50 nm, making their synthesis feasible through a straightforward two-step process combining desolvation and crosslinking.
Solution Approach 2:
The patent replaces the conventional glutaraldehyde chemical crosslinking system with a TPP-based ionic crosslinking system. This substitution allows for milder reaction conditions, better size control, and easier manufacturing of ultrasmall nanoparticles while maintaining structural integrity.
3Ease of manufacture
If larger nanoparticles (200-300 nm) are produced by conventional methods, then synthesis is easier and more established, but particles accumulate on tumor surface rather than penetrating interior
Solution Approach 1:
The patent systematically changes synthesis parameters including crosslinking agent (TPP vs glutaraldehyde), solvent composition (ethanol-acetone-water ratios), and pH conditions to shift the nanoparticle size distribution from 200-300 nm down to 10-50 nm, while maintaining a simple two-step synthesis protocol that remains easy to manufacture.
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 method effectively synthesizes gelatin nanoparticles that are small enough to penetrate deeply into tumor tissue, allowing for enhanced delivery of drugs or contrast agents.
Implementation Method 1
tripolyphosphate (TPP) is added to the first solution to form gelatin-TPP-gelatin bridges
Implementation Method 2
A first desolvation is conducted to produce gelatin strands in a first solution and then setting the pH of the solution to charge and separate the strands
Data Source
AI summary
A method for synthesizing ultrasmall gelatin nanoparticles. A first desolvation is conducted to produce gelatin strands in a first solution and then setting the pH of the solution to charge and separate the strands. Tripolyphosphate (TPP) is added to the first solution to form gelatin-TPP-gelatin bridges. Second desolvation of the gelatin-TPP-gelatin bridges is conducted in a second solution. The second solution contains an TPP-Ethanol:Acetone mixture in a ratio between 1:1 and 1:5 and TPP between 0.005-0.025 vol % or a Glutaraldehyde-Ethanol:Acetone mixture in a ratio of glutaraldehyde-ethanol:Acetone range of 2.5-12% v/v to produce a colloid of self-assembled gelatin nanoparticles. The method can produce nanomaterial consisting of a plurality of gelatin nanoparticles sized at ˜10 nm. The nanomaterial can encapsulate a drug, metal nanoparticle or contrast agent.