Nitrided Metal Surface Functionalized with Covalent Peptides
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Solution Overview
Problem
Current cleaning processes for surfaces in healthcare and other environments are inefficient in providing long-term antimicrobial control, as they do not effectively prevent re-colonization of microbes and can leave behind infectious agents, contributing to the spread of nosocomial infections and other microbial transmissions.
Innovation Solution
A nitrided metal surface functionalized with molecules, specifically peptides, that are immobilized via covalent interactions between carboxyl or imine binding groups and nitrogen atoms on the surface, providing a durable and long-lasting antimicrobial solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cleaning processes are used to reduce microbial contamination, then the spread of infection is temporarily decreased, but surfaces are re-colonized quickly and cleaning does not eradicate all microbes
Solution Approach 1:
The surface is pre-functionalized with antimicrobial molecules (peptides, proteins, or other antimicrobial agents) through covalent bonding or strong adsorption during manufacturing or initial treatment. This preliminary action ensures that the antimicrobial protection is already in place before microbial contamination occurs, providing long-lasting protection rather than requiring repeated cleaning interventions.
Solution Approach 2:
The invention changes the chemical parameters of the surface by introducing functional groups (such as carboxyl, amine, or hydroxyl groups) that can covalently bind antimicrobial molecules. This parameter change transforms the surface from a passive substrate to an active antimicrobial platform, enabling durable attachment of antimicrobial agents that persist through repeated use and cleaning cycles.
2Ease of manufacture
If electrostatic interactions are used to immobilize peptides on surfaces, then the immobilization process is simple, but the peptides are not stably retained and can be released under physiological conditions
Solution Approach 1:
The invention creates a composite surface structure consisting of three components: (1) the base surface material, (2) functional groups covalently attached to the surface, and (3) antimicrobial peptides or proteins attached to the functional groups. This composite structure provides both the simplicity of a multi-step process and the stability of covalent bonding, as each layer is strongly attached to the next.
Solution Approach 2:
The functional groups (carboxyl, amine, hydroxyl) serve as intermediary agents between the surface and the antimicrobial peptides. These intermediaries provide covalent attachment points that are stable under physiological conditions, preventing peptide release while maintaining the antimicrobial function. The intermediaries act as molecular bridges that ensure reliable connection.
3Object-affected harmful factors
If cleaning is performed frequently to maintain low microbial load, then contamination levels are temporarily reduced, but the process is time-consuming and does not provide long-term protection
Solution Approach 1:
The covalently attached or strongly adsorbed antimicrobial molecules provide continuous antimicrobial action over extended periods (weeks to months). The surface maintains its antimicrobial property continuously without requiring repeated cleaning interventions, as the attached molecules persist and actively prevent or eliminate microbial contamination throughout their attachment lifetime.
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 covalently immobilized peptides on the nitrided metal surface effectively reduce microbial growth and maintain antimicrobial activity for extended periods, even under frequent contact and various environmental treatments, significantly reducing bacterial colonization and transmission risks.
Implementation Method 1
all of the molecules are immobilized on the surface by only covalent interactions between the binding groups of the molecules and nitrogen atoms within the nitrided metal surface
Implementation Method 2
a nitrided metal surface functionalized with molecules, each molecule comprising at least one binding group, which is a carboxyl group or an imine, and an antimicrobial moiety, wherein all of the molecules are immobilized on the surface by only covalent interactions between the binding groups of the molecules and nitrogen atoms within the nitrided metal surface
Data Source
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AI summary
Provided is a nitrided metal surface functionalized with molecules, each molecule comprising at least one binding group and an antimicrobial moiety. The molecules are immobilized on the surface by only covalent interactions between the binding groups of the molecules and nitrogen atoms within the nitrided metal surface. Articles comprising the functionalized nitrided surface find use in inhibiting or reducing the growth of microorganisms on surfaces that are frequently touched. A method for preparing the functionalized nitrided surface comprises contacting a nitrided metal surface with molecules so as to form covalent bonds between the binding groups of the molecules and the nitrogen atoms in the surface, thereby immobilising the molecules on the metal surface.