Silica-Coated DNA Marking for Durable Item Verification
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Solution Overview
Problem
Current marking technologies for items suffer from limited distinct codes, high cost, complexity, and ease of removal, particularly for items with non-embedded markers, leading to unreliable verification and quantification, especially for hard materials like beans or finished products.
Innovation Solution
The use of nucleic acid tracers immobilized via a silica coating on item surfaces through polycondensation reactions, where the coating grows within surface indentations, providing durable and stable marking, allowing for easy identification and quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If markers are applied superficially on item surfaces, then the marking process is simple and suitable for hard materials, but the markers can be easily removed by chemical or mechanical means
Solution Approach 1:
The marker is nested within a silica coating layer that is itself nested on the item surface. The silica coating acts as a protective shell encapsulating the marker, preventing direct exposure to removing agents while maintaining the superficial application advantage
Solution Approach 2:
The marking system uses a composite structure combining the marker material with a silica coating layer. This composite provides both the identification function of the marker and the durability protection of the silica coating, resolving the contradiction between ease of application and marker durability
2Reliability
If microbeads are used as tracers, then identification is possible, but reliable analysis is time-consuming and requires high particle concentration
Solution Approach 1:
The patent replaces mechanical/physical analysis methods (microscopic examination of microbeads) with biochemical analysis methods (PCR amplification and sequencing of nucleic acid markers). This substitution enables faster, more sensitive detection at lower concentrations
Solution Approach 2:
The invention changes the detection parameter from physical characteristics (size, shape, color of microbeads) to biochemical characteristics (nucleic acid sequences). This allows for highly specific identification with minimal sample requirements and rapid analysis
3Adaptability or versatility
If DNA tracers are used, then a theoretically unlimited number of unique sequences can be provided, but the tracers are easy to remove if not embedded within the item
Solution Approach 1:
The DNA tracer is nested within a silica coating layer that provides physical and chemical protection. This nesting maintains the versatility of DNA sequences while preventing easy removal through embedding-like protection without altering the DNA's detectable properties
Solution Approach 2:
The silica coating provides localized protection specifically where the DNA tracer is positioned on the item surface. This localized encapsulation preserves the DNA's identification function while providing durability exactly where needed
4Reliability
If current marking technologies are used, then verification can be performed, but the cost and complexity of detection is high
Solution Approach 1:
The patent replaces complex physical detection systems (magnetic sensors, UV detectors, isotope analyzers) with simplified biochemical detection systems (PCR and sequencing). This substitution reduces device complexity while maintaining or improving verification reliability
Solution Approach 2:
The nucleic acid-based marking system uses universal detection methods (PCR and sequencing) that can identify any marker through a single standardized protocol. This multi-functionality eliminates the need for multiple specialized detection devices, reducing overall system complexity
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 enables durable and stable marking of items, reducing false negatives and enabling reliable verification and quantification, even under harsh conditions, with a wide range of items and improved accuracy.
Implementation Method 1
coating said item with said molecular precursor solution (5), and, optionally, said catalyst solution (7), to thereby obtain said marked item (1)
Data Source
Figure 1~2C
Figure 3~4D
AI summary
The invention provides methods for stably immobilizing nucleic acid tracers onto surfaces of products and objects. This method is applied for the identification and authentication of the marked object or product. The present invention further provides specific coated articles and their use in product verification; processes for manufacturing such coated articles, methods for the verification of the coated article, methods for the quantification of the coated article blending, and products suitable for such verification and quantification method.