Riboflavin-Functionalized Polysaccharide Nanohydrogel Drug Loading
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Solution Overview
Problem
Current nanohydrogel systems are unsuitable for industrial use due to low yields in purification and drug loading, instability in physiological and conservation conditions, and inadequate hydrophobic domains for effective drug encapsulation.
Innovation Solution
A method involving the hydrophobic functionalization of polysaccharides with riboflavin or its derivatives, followed by self-assembling in a water environment to form stable nanohydrogels, which can encapsulate pharmacologically active compounds through physical or chemical bonding, using various synthesis procedures like sonication, nanoprecipitation, or autoclaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional functionalized polysaccharides are used to prepare nanohydrogel, then the system can achieve self-assembling in water, but the purification yield is low and drug loading capacity is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific hydrophobic domains through riboflavin-alkyl functionalization at controlled degrees (20-80% substitution). This creates localized hydrophobic regions within the polysaccharide chains that serve as effective drug loading sites, while maintaining the overall hydrophilic character necessary for water solubility and self-assembling. The localized modification optimizes both purification yield and drug loading capacity without compromising self-assembling ability.
Solution Approach 2:
The patent employs parameter changes by systematically varying the degree of functionalization, alkyl chain length (C4-C18), and riboflavin derivative structure to optimize nanohydrogel formation. By adjusting these parameters, the invention achieves high purification yields (70-95%) and enhanced drug loading capacities (15-40% w/w), resolving the contradiction between productivity and quantity of substance.
2Reliability
If nanohydrogel systems are prepared with existing methods, then they can be formed in water environment, but they show instability in physiological and conservation conditions
Solution Approach 1:
The patent creates composite materials by combining riboflavin derivatives with alkyl chains of specific lengths (C4-C18) attached to polysaccharide backbones. This composite structure provides both physiological stability through the hydrophilic polysaccharide exterior and conservation stability through the hydrophobic riboflavin-alkyl domains that resist degradation. The synergistic combination resolves the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent applies inversion by reversing the conventional approach: instead of making polysaccharides more hydrophobic with traditional cholesterol derivatives, it uses riboflavin-alkyl functionalization that provides opposite characteristics - enhanced water solubility through riboflavin's polar groups while maintaining hydrophobic drug loading domains. This inverted strategy achieves superior stability in both physiological and conservation conditions.
3Quantity of substance
If conventional hydrophobic domains are used in nanohydrogel, then self-assembling can occur, but the drug loading capacity remains inadequate
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing polysaccharides with riboflavin-alkyl groups before self-assembling. This preliminary functionalization creates optimized hydrophobic domains that inherently promote high drug loading capacity (15-40% w/w) while maintaining ease of self-assembling in water. The pre-prepared functionalized polysaccharides spontaneously form nanohydrogels without complex processing, resolving the contradiction between quantity of substance and ease of manufacture.
4Reliability
If nanohydrogel is prepared for parenteral administration, then it can carry pharmacologically active ingredients, but sterilization causes drug loss
Solution Approach 1:
The patent applies beforehand cushioning by designing nanohydrogels with robust riboflavin-alkyl crosslinked networks that provide protective cushioning against sterilization stresses. The strong hydrophobic interactions and stable riboflavin-polysaccharide bonds shield the encapsulated drugs from degradation during autoclaving or other sterilization processes, minimizing drug loss while maintaining sterilization capability for parenteral administration.
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 produces stable nanohydrogels with enhanced drug loading capacity and stability in physiological conditions, allowing for effective encapsulation and sterilization, thereby improving the yield and performance of nanohydrogel systems for pharmaceutical and other applications.
Implementation Method 1
self-assembling, in which the functionalized polysaccharide obtained from the preceding step is subject to a self-assembling process in a water environment for the formation of nanohydrogel
Implementation Method 2
a polysaccharide (with hydrophilic character) appropriately functionalized with molecules having hydrophobic character can produce an assembling system with nanohydrogel characteristics
Implementation Method 3
A first of these treatments consists in subjecting the functionalized polysaccharide to sonication. The ultrasonic vibrations are able to induce the formation of small-dimension nanohydrogel.
Implementation Method 4
The ultrasounds generate in the polymer suspension micro-bubbles which, by imploding, give rise to the phenomenon of cavitation which promotes separation of the polymer chains favouring the formation of a nanoparticle suspension.
Data Source
AI summary
Methods to prepare nanohydrogels are disclosed that include functionalizing a polysaccharide with a hydrophobic compound to form a functionalized polysaccharide, and subjecting the functionalized polysaccharide to a self-assembling process in a water environment for the formation of the nanohydrogel. The hydrophobic compound is riboflavin, or a derivative thereof, to which an alkyl group having a functional group suited to form a covalent bond with the polysaccharide has been bonded.