Hyperbranched Nitric Oxide Scaffolds for Controlled Antibacterial Release

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Solution Overview

Problem

Bacterial infections, particularly those involving biofilms, are challenging due to the protective exopolysaccharide matrix that shields bacteria from immune responses and antibiotics, and existing nitric oxide (NO) therapies suffer from limited payloads, rapid release rates, and lack of targeted delivery.

Innovation Solution

Development of hyperbranched NO-releasing constructs, such as functionalized hyperbranched poly(amidoamine) compounds, that slowly release NO to damage bacterial membranes and DNA, reducing microbial viability without causing tissue irritation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing nitric oxide therapies are used, then antimicrobial activity is achieved, but the release rate is too rapid and payload is limited

Engineering Contradiction:

Improveantimicrobial activityVSAvoidNO release rate control

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent embeds nitric oxide donor groups within the internal structure ofhyperbranched poly(amidoamine) dendrimers. The NO donors are nested within the dendritic layers, allowing controlled release through the branched architecture rather than surface-level rapid release. This nesting enables sustained antimicrobial activity over extended periods.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent modifies the chemical parameters of NO delivery by incorporating NO donor groups into the dendrimer structure at specific positions. By changing the molecular architecture from linear to hyperbranched and controlling the density and placement of NO donors, the release kinetics are fundamentally altered from rapid to controlled, extending duration of action.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional antibiotics are used against biofilms, then some bacterial activity is inhibited, but the exopolysaccharide matrix protects bacteria from immune response and antibiotics

Engineering Contradiction:

Improvebacterial inhibitionVSAvoidbiofilm protection

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the protective function of the dendrimer structure into a benefit for controlled delivery. The same branched architecture that could potentially shield the active agent now serves to protect and sustain the NO donors, allowing them to penetrate and disrupt biofilm matrices that protect bacteria. The structured delivery system turns potential shielding into sustained penetration capability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent creates a composite therapeutic agent combining the dendritic poly(amidoamine) scaffold with integrated nitric oxide donor groups. This composite structure provides both the structural integrity needed for stability and the chemical functionality for antimicrobial activity, enabling penetration through biofilm exopolysaccharide matrices that resist conventional antibiotics.

Inventive Principle:

Principle #40Composite materials

3Reliability

If nitric oxide is delivered therapeutically, then pathophysiology is treated, but targeted delivery is lacking

Engineering Contradiction:

Improvetherapeutic effectVSAvoidtargeted delivery

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent imparts local quality to the NO delivery system by positioning NO donor groups at specific locations within the dendrimer structure. The hyperbranched architecture allows different regions of the molecule to have different functionalities, with NO donors strategically placed to enable targeted release at the site of infection rather than systemic distribution.

Inventive Principle:

Principle #3Local quality

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 hyperbranched NO-releasing compounds effectively reduce microbial contamination by inducing membrane and DNA damage in bacteria, including drug-resistant strains, while maintaining safety for human and animal surfaces.

Implementation Method 1

the NO donor of the hyperbranched construct generates NO and induces damage to the membrane and/or DNA of the microbes

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Data Source

PatentUS12460050B2Nitric oxide-releasing hyperbranched compounds as antibacterial scaffolds and methods pertaining thereto

Publication Date: 2025.11.04 THE UNIV OF NORTH CAROLINA AT CHAPEL HILL

AI summary

Several embodiments of hyperbranched structures are disclosed. In some embodiments, the hyperbranched structures are covalently modified to store and release nitric oxide. Some embodiments pertain to methods of making and also to the use of hyperbranched structures. The covalently modified hyperbranched structures may be tailored to release nitric oxide in a controlled manner and are useful for eradication of both gram positive and gram negative bacteria as well as other microbes.