Polygonum cuspidatum Photodynamic Antimicrobial Agents
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Solution Overview
Problem
Current antimicrobial agents, such as chlorhexidine, have limitations in their substantivity and potential for resistance, and there is a need for novel compositions and methods that offer immediate bactericidal or anti-cancer activity, particularly in the context of photodynamic inactivation and therapy.
Innovation Solution
A method involving the use of Polygonum cuspidatum extracts in combination with light and oxygen to inactivate microorganisms, including bacteria, viruses, and fungi, using a composition that includes an excipient, applied in the oral cavity or on dental appliances, with specific formulations and irradiation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antimicrobial agents like chlorhexidine are used, then potent bactericidal activity is achieved, but substantivity is limited and resistance develops
Solution Approach 1:
The patent changes the mechanism of action from direct chemical antimicrobial activity to photodynamic inactivation by introducing light activation. This parameter change enables sustained antimicrobial effects through repeated light exposures while maintaining potent bactericidal activity, resolving the contradiction between efficacy and duration of action
Solution Approach 2:
The photodynamic inactivation method employs periodic light activation to maintain antimicrobial activity. Instead of relying on continuous presence of antimicrobial agents, the system uses intermittent light exposures to repeatedly activate the photosensitizer, providing sustained substantivity without resistance development
2Reliability
If P. cuspidatum extracts are used in traditional antimicrobial mode, then broad antibacterial activity is achieved, but the effect is time-dependent and attenuated in biofilms
Solution Approach 1:
The patent replaces the time-dependent chemical diffusion mechanism with a light-driven photodynamic mechanism. Light activation provides immediate and consistent antimicrobial activity regardless of exposure time, eliminating the time-dependent limitation while maintaining broad antibacterial spectrum and enhancing biofilm penetration
3Duration of action of stationary object
If chlorhexidine is used for prolonged action, then substantivity is improved, but staining and taste alteration occur
Solution Approach 1:
The patent changes from direct-contact chemical antimicrobials to a photodynamic system where the photosensitizer remains inert until light activation. This parameter change eliminates staining and taste alteration issues while providing prolonged substantivity through repeated light activations
Solution Approach 2:
The photosensitizer acts as an intermediary that converts light energy into antimicrobial activity. This intermediary mechanism avoids direct harmful chemical interactions with teeth and taste buds, eliminating staining and taste alteration while maintaining prolonged antimicrobial substantivity
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 achieves effective photodynamic inactivation of microorganisms, providing immediate and sustained antimicrobial effects without the drawbacks of traditional agents, including resistance and substantivity issues, while also demonstrating photo-stability and enhanced activity compared to isolated components.
Implementation Method 1
Photodynamic inactivation (PDI) of microorganisms represents a powerful alternative to traditional antibiotics... PDI employs a photosensitizer (PS), light, and oxygen to inactivate and destroy bacteria, viruses, fungi, and protozoa through the production of cytotoxic singlet oxygen (1O2), and other reactive oxygen species (ROS), from an excited state of the photosensitizer
Data Source
AI summary
The present invention describes a method of killing or inactivating microorganisms, the method comprising the steps of contacting the microorganisms with a composition comprising an extract of Polygonum cuspidatum and an excipient; and irradiating the microorganisms with a source of light; wherein the radiant exposure of the light is between 1 and 300 J cm−2, and the surface power density of the light is between 0.001 and 0.25 W cm−2.