Metal Nanoparticle Oral Composition for Malodor Control
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Solution Overview
Problem
Existing oral rinses for halitosis often have an astringent or bitter taste, can be absorbed into the bloodstream, and may contain alcohol or other harmful compounds, and fail to provide long-term malodor control.
Innovation Solution
An aqueous oral composition comprising non-toxic metal nanoparticles, such as zinc or silver, in colloidal form, combined with a mucoadhesive polymer like hyaluronic acid, which reacts rapidly with volatile sulfur compounds to neutralize oral malodor without taste or odor, and adheres to the keratin layer for prolonged action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-soluble metal salts are used to neutralize VSCs, then malodor control effectiveness is improved, but taste becomes disagreeable and dental dyschromia occurs
Solution Approach 1:
The patent changes the physical state and solubility parameters of the metal compound. Instead of using water-soluble metal salts, the invention employs water-insoluble metal compounds in the form of fine particles or colloidal suspensions. This parameter change allows the active ingredient to remain in the oral cavity longer, continuously neutralize VSCs, and avoid the rapid dissolution that causes bitter taste and systemic absorption. The insoluble nature of the metal compound particles resolves the contradiction by maintaining effectiveness while eliminating disagreeable taste and dental discoloration issues.
Solution Approach 2:
The patent utilizes metal compound particles that are consumed during the neutralization process. These particles are inexpensive, non-toxic, and designed to be short-lived in the oral cavity, performing their neutralization function and then being naturally eliminated. This approach replaces the need for long-lasting but harmful water-soluble salts with disposable, safe particles that provide continuous protection without accumulating or causing side effects.
2Reliability
If conventional oral rinses are used, then malodor control is achieved, but the composition is absorbed into the bloodstream and may cause harmful effects
Solution Approach 1:
The patent fundamentally changes the solubility parameter of the active ingredient by using water-insoluble metal compounds instead of water-soluble salts. This parameter change ensures that the metal compound particles remain suspended in the oral rinse formulation without dissolving and being absorbed through the oral mucosa into the bloodstream. The insoluble particles are trapped in the oral cavity, where they continuously neutralize VSCs, and are eventually eliminated through natural oral clearance mechanisms, thereby preventing systemic absorption and potential harmful effects.
3Reliability
If water-soluble chemicals are used in oral rinses, then malodor neutralization occurs, but the chemicals may be harmful if accidentally ingested
Solution Approach 1:
The patent employs non-toxic metal compound particles that are safe for ingestion and naturally eliminated from the body. These particles are designed to be short-lived in the oral cavity, performing their neutralization function and then being safely excreted. The use of food-grade, non-toxic materials such as zinc oxide, magnesium oxide, or calcium carbonate ensures that even if accidentally ingested, no harm will result. This resolves the contradiction by maintaining effective malodor control while eliminating ingestion risks associated with conventional water-soluble chemicals.
4Reliability
If oral rinses contain alcohol or absorbable compounds, then malodor control is effective, but long-term use may have unknown harmful effects
Solution Approach 1:
The patent changes the formulation parameters by eliminating alcohol and replacing absorbable small-molecule chemicals with water-insoluble metal compound particles. This parameter change transforms the product into a safe, long-term use formulation. The insoluble particles cannot be absorbed through the oral mucosa, and the use of non-toxic, food-grade materials ensures safety even with chronic daily use. The particles provide sustained malodor control through continuous surface neutralization without the cumulative toxicity risks associated with alcohol-based or absorbable compound formulations.
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 effectively reduces volatile sulfur compounds by over 90% in the oral cavity within a minute, is tasteless and odorless, and provides long-term malodor control by retaining active compounds on the keratin layer.
Implementation Method 1
a water-insoluble solid metal agent in suspension reacts with the odor-causing VSCs to neutralize the odor
Implementation Method 2
combined with a mucoadhesive polymer like hyaluronic acid, which reacts rapidly with volatile sulfur compounds to neutralize oral malodor without taste or odor, and adheres to the keratin layer for prolonged action
Implementation Method 3
an aqueous suspension of nanoscale particles of one or more metals
Data Source
AI summary
An aqueous composition for removing oral malodor caused by volatile gaseous compounds present in the oral cavity is disclosed herein. The aqueous oral composition comprises one or more of metals selected from the group consisting of Silver, Gold, Zinc, Aluminum, Magnesium and Tin, wherein the metals are present as a stable aqueous nanoparticulate dispersion or a colloid, having an average metal particle size of 1-1000 nm. at a concentration between 1 to 100 ppm. The aqueous oral composition may also include metal particles that may be partially oxidized, by reaction with oxygen including that from air during manufacture or storage. The aqueous oral composition may also include a mucoadhesive polymer selected from a group of water-soluble polymers having an affinity to keratin. The aqueous oral composition may be a synergistic mixture of two or more metal nanoparticulate colloids.