Light-Stable Silver Disinfectant via Chelation and pH Control
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Solution Overview
Problem
Traditional disinfectants, such as benzothiazoles and silver nanoparticles, are toxic and have limited stability, posing safety and environmental concerns, while existing silver-based solutions are light-sensitive and have short shelf lives.
Innovation Solution
A non-toxic, light-stable antimicrobial disinfectant composition comprising silver salts, a chelating agent, and a bio-polymer, with a pH adjusted to neutral, providing a gradual release of bioavailable silver ions for effective microbial neutralization without toxicity or environmental hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional disinfectants (benzothiazoles, parabens, hypochlorites, peroxides, quaternary ammonium compounds) are used for disinfection, then effective microbial neutralization is achieved, but toxicity and safety concerns arise for long-term usage
Solution Approach 1:
The patent changes the chemical composition parameters by using silver salts (silver nitrate, silver acetate, silver lactate, or silver carbonate) at concentrations of 0.01-5% instead of traditional toxic disinfectants. The formulation includes specific pH adjusters (phosphate buffers, sodium hydroxide, potassium hydroxide, or citric acid) to maintain near-neutral pH (6.5-7.5), and incorporates stabilizers (polypectate, EDTA, glycerin, propylene glycol) to ensure long-term stability without toxicity.
Solution Approach 2:
The patent creates a composite disinfectant formulation combining silver salts with multiple auxiliary components: chelating agents (polypectate, EDTA) to stabilize silver ions, pH adjusters to maintain neutral pH, and surfactants (alkylsulfates, sulfonates, alkanolamides, betaines, amine oxides, sarcosinates, sulfosuccinates) to enhance penetration and distribution. This composite approach achieves effective disinfection while eliminating the toxicity of single-ingredient traditional disinfectants.
2Reliability
If water-soluble silver compounds are used at high concentrations (>10%) for effective anti-microbial activity, then microbial neutralization is improved, but silver accumulation in the human body occurs leading to skin discoloration
Solution Approach 1:
The patent optimizes the silver compound concentration parameter to a safe range of 0.01-5% (w/v), which is sufficient for anti-microbial efficacy when combined with polypectate and other stabilizing agents. This low concentration prevents silver accumulation in the human body and associated skin discoloration, while maintaining effective disinfection through the synergistic action of multiple formulation components.
Solution Approach 2:
The patent introduces polypectate as an intermediary substance that complexes with silver ions, enhancing their anti-microbial effectiveness at low concentrations while reducing direct contact between free silver ions and human tissue. This mediator approach allows effective disinfection at 0.01-5% silver concentration without the harmful effects of high-concentration silver compounds.
3Reliability
If silver nanoparticles are used in disinfectant formulations, then anti-microbial activity is achieved, but light sensitivity and short shelf life result
Solution Approach 1:
The patent changes the physical form parameter from silver nanoparticles to water-soluble silver salts (silver nitrate, silver acetate, silver lactate, or silver carbonate). This parameter change eliminates light sensitivity and extends shelf life, while maintaining anti-microbial activity through the use of polypectate and other stabilizing agents that ensure long-term composition stability.
Solution Approach 2:
The patent replaces unstable silver nanoparticles with stable silver salt formulations that do not require special storage conditions (such as避光 storage). This substitution eliminates the need for disposable or short-shelf-life products, providing a long-lasting, stable disinfectant that maintains efficacy without degradation from light exposure or storage time.
4Stability of the object's composition
If silver salts with polypectate are used to achieve stability, then long-term stability is improved, but gradual decomposition of polypectate molecules occurs leading to formation of extraneous compounds
Solution Approach 1:
The patent uses a composite stabilizing system combining multiple agents: polypectate (0.1-10% w/v) for initial stabilization, EDTA (0.1-5% w/v) as a chelating agent to prevent silver ion precipitation and decomposition, and additional stabilizers (glycerin 0.1-10%, propylene glycol 0.1-10%) to maintain molecular integrity. This multi-component composite approach prevents polypectate decomposition and formation of extraneous compounds, ensuring long-term stability.
Solution Approach 2:
The patent introduces EDTA as an intermediary chelating agent that competes with polypectate for silver ions, preventing polypectate decomposition. EDTA forms stable complexes with silver ions, acting as a protective mediator that prevents the formation of extraneous compounds while maintaining the stability of the silver-polypectate complex system.
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 composition achieves long-lasting, instant kill activity on hard surfaces, maintaining stability and efficacy for extended periods, with no red or white rust on stainless steel panels and significant microbial reduction, while being environmentally friendly and cost-effective.
Implementation Method 1
comprising silver salts, a chelating agent, and a bio-polymer, with a pH adjusted to neutral, providing a gradual release of bioavailable silver ions
Implementation Method 2
comprising silver salts, a chelating agent, and a bio-polymer, with a pH adjusted to neutral, providing a gradual release of bioavailable silver ions
Implementation Method 3
The composition achieves long-lasting, instant kill activity on hard surfaces, maintaining stability and efficacy for extended periods
Data Source
AI summary
A light stable, environmentally friendly, broad spectrum antimicrobial disinfectants comprising of active metal ions and method of preparing the same are provided. The compositions are non-toxic, cost-effective formulations, comprising of metal ions, biopolymer, and complexing agent. The compositions are very effective with the dosing and treatment regime designed to give a 6-log reduction in bacteria and virus count and also expected to yield 30 days or more of residual efficacy.