Poly(alkylated imidazolium) Salts for Selective Antimicrobial Action
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current antimicrobial agents face challenges in effectively targeting a broad spectrum of multidrug-resistant bacteria while minimizing toxicity to mammalian cells and being cost-effective for large-scale production, with existing polymers often requiring toxic solvents and difficult scaling up.
Innovation Solution
Development of cationic poly(alkylated imidazolium) chloride salts synthesized via the Debus-Radziszewski reaction using inexpensive starting chemicals, which exhibit broad-spectrum antimicrobial properties with low hemolysis and high selectivity for pathogens over human red blood cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antimicrobial polymers (PHMB, PDADMAC) are used, then broad-spectrum antimicrobial activity is achieved, but toxicity towards mammalian cells increases
Solution Approach 1:
The patent changes the chemical structure parameters by using imidazolium rings instead of traditional ammonium groups, and by controlling the alkyl chain lengths (R1-R8) to optimize the balance between antimicrobial efficacy and mammalian cell toxicity. The molecular weight and degree of substitution are also controlled to achieve the desired selectivity.
Solution Approach 2:
The invention creates a composite structure combining the imidazolium cationic core with variable alkyl substituents and carboxylic acid groups, forming a polymeric composite material that achieves both broad-spectrum antimicrobial activity and reduced mammalian toxicity through the synergistic arrangement of its structural components.
2Reliability
If antimicrobial peptides (polymyxins) are used, then selectivity towards Gram-negative bacteria is achieved, but production cost increases and nephrotoxicity occurs
Solution Approach 1:
The patent employs inexpensive starting materials (formaldehyde, glyoxal, diamines) that can be readily obtained and processed, replacing expensive peptide-based antimicrobials. The synthetic polymeric structure is designed to be stable and reusable, eliminating the need for complex biological production processes.
Solution Approach 2:
The invention replaces the biological peptide-based system with a synthetic chemical polymer system, substituting complex biological production mechanisms with straightforward chemical synthesis processes, thereby eliminating nephrotoxicity associated with colistin and reducing production costs.
3Ease of manufacture
If free radical polymerisation or ring opening polymerisation is used, then polymer synthesis is achieved, but large quantities of toxic solvents are required and scaling up becomes difficult
Solution Approach 1:
The patent employs a self-assembling condensation reaction between diamines and aldehydes that proceeds in aqueous medium without requiring additional solvents or catalysts. The reaction self-regulates through the formation of imidazolium rings, eliminating the need for toxic solvent systems and enabling straightforward scale-up.
Solution Approach 2:
The invention changes the synthesis approach from conventional free radical or ring-opening polymerisation to a condensation reaction that uses water as the sole solvent, fundamentally altering the process parameters to eliminate toxic solvent waste and simplify scaling operations.
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 polymers demonstrate excellent antimicrobial efficacy against both Gram-positive and Gram-negative bacteria with low toxicity to mammalian cells and are cost-effective for large-scale production, making them suitable for pharmaceutical and hygiene applications.
Implementation Method 1
poly(alkylated imidazolium) chloride salts synthesized via the Debus-Radziszewski reaction using inexpensive starting chemicals
Data Source
AI summary
Disclosed herein are polymers containing repeating units of formula (I) or copolymers containing the repeating units of formula (I) and (II), where R1 to R12, m, n, p, q, x and y are as defined herein. The polymers and copolymers have an antimicrobial effect and may be used therapeutically or in formulations intended for use as detergents.