Antibacterial Cleansing Composition Using Silver and Nitrate Synergy
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Solution Overview
Problem
Current skin cleansing products with silver ions have limited biocidal action on a short time scale, particularly against Gram-positive bacteria like Staphylococcus aureus, due to the thick peptidoglycan layer slowing silver ion action, and are restricted by high chloride ion levels which precipitate silver chloride, reducing efficacy.
Innovation Solution
The use of sulfate surfactants combined with silver compounds and nitrate salts in a cleansing composition, maintaining silver ion solubility and efficacy while providing a wider pH range compatibility, enhancing biocidal action through synergy with nitrate salts protecting against chloride ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver ion is used as a biocidal agent in cleansing products, then broad-spectrum antimicrobial activity is achieved, but the action time is too slow for practical hand-washing applications
Solution Approach 1:
The patent combines silver ion with sulfate surfactants and nitrate salts to create a composite cleansing composition. The sulfate surfactant and nitrate salt work synergistically with silver ion to accelerate its biocidal action, reducing the contact time from minutes to 10-60 seconds while maintaining broad-spectrum antimicrobial activity against both Gram-positive and Gram-negative bacteria
Solution Approach 2:
The patent optimizes the concentration parameters of silver ion (0.03 to 3 ppm), sulfate surfactant (5 to 25% by weight), and nitrate salt (1 to 10% by weight) to achieve rapid biocidal action. The pH is adjusted to 4-10 range to enhance the effectiveness of the combination and accelerate silver ion action against bacteria with thick peptidoglycan layers
2Productivity
If higher concentration of silver ion is used to accelerate biocidal action, then antimicrobial efficacy is improved, but silver oxide formation and discoloration increase
Solution Approach 1:
The nitrate salt acts as an intermediary that enhances the biocidal action of silver ion without requiring high concentrations. It facilitates faster penetration through bacterial cell walls and synergizes with sulfate surfactants to accelerate killing action, allowing effective antimicrobial activity at low silver ion levels (0.03 to 3 ppm) while minimizing silver oxide formation and discoloration
Solution Approach 2:
The patent maintains silver ion concentration at low levels (0.03 to 3 ppm) by optimizing the pH to 4-10 and combining with sulfate surfactants and nitrate salts. This parameter optimization achieves rapid biocidal action without exceeding the threshold that would cause excessive silver oxide formation and discoloration
3Reliability
If chloride ions are present in the cleansing composition, then surfactant performance is maintained, but silver chloride precipitation occurs reducing silver ion efficacy
Solution Approach 1:
The nitrate salt serves as an intermediary that protects silver ion from chloride ion interference. It competes with chloride ions for interaction with silver, preventing silver chloride precipitation and maintaining silver ion solubility and efficacy in the presence of typical chloride levels in cleansing compositions
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 combination of sulfate surfactants and silver ions with nitrate salts in a cleansing composition achieves a significant biocidal effect against Staphylococcus aureus within a 10-60 second time frame, overcoming the limitations of silver ion solubility and chloride ion interference, providing enhanced antimicrobial activity.
Implementation Method 1
The use of silver as a biocidal agent... is believed to involve multiple lines of attack, including damaging the bacterial membrane and cell wall, coagulation of the cellular components, binding and condensation of DNA, and inactivation of critical membrane-bound proteins and enzymes via binding with thiol groups
Implementation Method 2
maintaining silver ion solubility and efficacy while providing a wider pH range compatibility, enhancing biocidal action through synergy with nitrate salts protecting against chloride ions
Implementation Method 3
enhancing biocidal action through synergy with nitrate salts protecting against chloride ions
Data Source
Figure 1~2
AI summary
A cleansing composition comprising a sulfate surfactant; a fatty acid soap; a silver compound; a thickening agent; and a nitrate. A pH of the cleansing composition is 5 to 10. Another cleansing composition comprising a sulfate surfactant; a silver compound; a thickening agent; a nitrate; and a preservative. A pH of this cleansing composition is 4 to 5.5.