Enzymatic Reagent Ink Wetability Control
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Solution Overview
Problem
Existing enzymatic reagent inks for analytical test strips face challenges in achieving consistent wetability and calibration characteristics, particularly with hydrophobic silica materials, which can result in batch-to-batch variability and inadequate analyte determination accuracy.
Innovation Solution
The use of predetermined amounts of hydrophobic silica material and surfactant, based on specific relationships between wetability and calibration characteristics, ensures minimum wetability and accurate analyte determination in enzymatic reagent inks, allowing for the inclusion of hydrophobic silica materials that would otherwise be unsuitable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrophobic silica material is used in enzymatic reagent ink, then cost and preparation time are reduced, but wetability and calibration accuracy deteriorate
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the hydrophobic silica material and the aqueous enzyme solution. The surfactant reduces surface tension and improves wetability, allowing the hydrophobic silica to function effectively in the reagent ink without requiring complex preprocessing or alternative materials.
Solution Approach 2:
The wetability parameter of the hydrophobic silica material is modified by adjusting the surfactant concentration. By optimizing the surfactant amount, the reagent ink achieves sufficient wetability for accurate calibration while maintaining the cost and preparation time advantages of using hydrophobic silica.
2Ease of manufacture
If hydrophobic silica material is used in enzymatic reagent ink, then manufacturing cost is reduced, but batch-to-batch consistency deteriorates
Solution Approach 1:
The surfactant acts as a consistent intermediary that standardizes the interaction between hydrophobic silica particles across different batches. This mediator ensures uniform wetability and calibration characteristics regardless of variations in silica material properties between batches.
Solution Approach 2:
By controlling the surfactant concentration as a key parameter, the invention compensates for batch-to-batch variations in hydrophobic silica material. The optimized surfactant amount ensures consistent reagent ink performance across multiple production batches.
3Loss of time
If hydrophobic silica material is used without surfactant optimization, then preparation time is reduced, but wetability deteriorates
Solution Approach 1:
The surfactant is pre-added to the reagent ink formulation before manufacturing, allowing the hydrophobic silica material to achieve optimal wetability immediately upon mixing. This preliminary inclusion of surfactant eliminates the need for time-consuming post-processing or extended mixing times.
Solution Approach 2:
The wetability of the reagent ink is enhanced by optimizing the surfactant concentration parameter. This allows the use of hydrophobic silica material without requiring extended preparation times or additional processing steps to achieve sufficient wetability.
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
This approach enables the production of enzymatic reagent inks with consistent and accurate calibration characteristics, accommodating batch-to-batch variability in hydrophobic silica materials and enhancing the suitability of hydrophobic silica materials for use in analytical test strips without increasing costs or preparation times.
Implementation Method 1
a reagent layer disposed on a portion of the substrate, the reagent layer including an enzymatic reagent ink comprising: an amount of hydrophobic silica material; an amount of surfactant; and an amount of enzyme
Implementation Method 2
a first relationship between wetability of a representative hydrophobic silica material and at least a first calibration slope or intercept of an analytical test strip
Data Source
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AI summary
An analytical test strip includes a substrate and a reagent layer disposed on a portion of the substrate. The reagent layer includes an enzymatic reagent ink comprising an amount of hydrophobic silica material, an amount of surfactant; and an amount of enzyme. The amounts of the hydrophobic silica material and the surfactant in the enzymatic reagent ink is predetermined using a first relationship and a second relationship. The first relationship is between wetability of a representative hydrophobic silica material and at least a first calibration characteristic of an analytical test strip that includes an enzymatic reagent ink containing the representative hydrophobic silica material. In addition, the first relationship defines a minimum wetability that provides an acceptable first calibration characteristic. The second relationship defines wetability of a mixture of the hydrophobic silica material and the surfactant across a range of relative amounts of the hydrophobic silica material and the surfactant. The predetermined amounts of the hydrophobic silica material and the surfactant employed in the enzymatic reagent ink provide at least the minimum wetability defined by the first relationship during manufacturing of the enzymatic reagent ink and, therefore, an acceptable first calibration characteristic.