Conjugated Polyelectrolyte Structure Prevents Aggregation
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Solution Overview
Problem
Conjugated polyelectrolytes tend to form π-stacked aggregates in aqueous media, leading to aggregation-induced quenching of excited states and reduced interaction with bacterial membranes, which hampers their effectiveness in inactivating pathogens.
Innovation Solution
A conjugated polyelectrolyte with a specific subunit structure that minimizes aggregation in aqueous environments, maintaining effective interaction with bacterial membranes and enhancing biocidal activity, is developed. This polyelectrolyte includes a subunit with specific functional groups and linkages that prevent π-stacking, allowing for efficient singlet oxygen sensitization and bacterial inactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conjugated polyelectrolytes are used in aqueous media, then they can interact with bacterial membranes, but they form π-stacked aggregates that quench excited states and reduce effectiveness
Solution Approach 1:
The patent modifies the chemical structure of conjugated polyelectrolytes by introducing specific side chain configurations and electroactive groups that change the physical-chemical parameters of the polymer, preventing π-stacking aggregation while maintaining aqueous solubility and bacterial membrane interaction capability
Solution Approach 2:
The invention creates composite structures within the polymer by combining conjugated backbones with specific electroactive side chains, resulting in a material that simultaneously prevents aggregation and maintains biocidal functionality through controlled molecular architecture
2Stability of the object's composition
If conjugated polyelectrolytes aggregate in water, then they maintain structural stability, but they lose fluorescence and triplet state stability
Solution Approach 1:
The patent changes the molecular parameters of conjugated polyelectrolytes by incorporating specific side chain lengths, charges, and spacing that prevent close π-π stacking while maintaining overall structural integrity and aqueous solubility, thereby preserving fluorescence and triplet state stability
3Quantity of substance
If conjugated polyelectrolytes form aggregates, then they concentrate in aqueous media, but they reduce interaction with bacterial membranes
Solution Approach 1:
The patent modifies physical-chemical parameters including side chain charge density, hydrophilicity, and molecular weight to optimize the balance between aqueous solubility and membrane interaction, preventing aggregation that would reduce membrane accessibility while maintaining sufficient concentration for effective biocidal activity
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 conjugated polyelectrolyte effectively inactivates bacteria by maintaining fluorescence and triplet state stability in water, enhancing biocidal activity against both Gram-positive and Gram-negative bacteria, even at low concentrations, and exhibits antimicrobial properties in both light-activated and dark conditions.
Implementation Method 1
it is clearly established that the triplet-excited state plays an important role in sensitizing singlet oxygen and other reactive oxygen species that are essential in deactivating pathogenic bacteria
Implementation Method 2
aggregation of CPEs deactivates the excited state (singlet and triplet) by a non-radiative pathway (e.g., 'aggregation induced quenching,' or 'AIQ')
Implementation Method 3
aggregation of CPEs deactivates the excited state (singlet and triplet) by a non-radiative pathway (e.g., 'aggregation induced quenching,' or 'AIQ')
Data Source
AI summary
Various embodiments disclosed relate to conjugated polyelectrolytes and methods of using the same. Various embodiments provide a conjugated polyelectrolyte including a subunit having the structure —R1—Y—R2—Z—. At each occurrence, R1 is independently chosen from 1,4-bonded phenylene substituted by —X—R3-R4 j times and 2,5-bonded thiophene substituted by —X—R3-R4 j times. At each occurrence, Y is independently chosen from a bond and —C≡C—. At each occurrence, R2 is independently chosen from a bond, a substituted or unsubstituted phenylene, thiophenylene, azulenylene, heptalenylene, biphenylene, indacenylene, fluorenylene, phenanthrenylene, triphenylenylene, pyrenylene, naphthacenylene, chrysenylene, biphenylenylene, anthracenylene, and naphthylene. At each occurrence, Z is independently chosen from a bond and —C≡C—. The variables j, R3, and R4 are as defined herein.