Protein-Buffered pH Indicator for Narrow-Range Threshold Detection
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Solution Overview
Problem
Existing pH indicators lack the ability to rapidly and sensitively indicate subtle pH changes, particularly around specific thresholds, limiting their utility in applications requiring precise pH detection.
Innovation Solution
A combination of proteins with specific isoelectric points and molecular weights, along with a matching buffer solution, is used to create an ultra-sensitive indicator that can rapidly respond to pH changes within a narrow range by controlling the color change interval between 0.1-0.2 pH units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pH indicators are used, then a wide pH range can be detected with multiple colors, but the response to subtle pH changes is slow and not sensitive enough
Solution Approach 1:
The patent changes the chemical parameters of the indicator system by introducing proteins with specific isoelectric points (pI) ranging from 3.0-10.0 and molecular weights of 10-200 kDa. These parameter changes enable the indicator to respond rapidly to subtle pH changes (0.1-0.2 pH units) while maintaining clear color transitions, resolving the contradiction between sensitivity and response speed
Solution Approach 2:
The patent creates a composite indicator system combining conventional acid-base indicators with specific proteins (such as bovine serum albumin, casein, or gelatin). This composite material leverages the buffering capacity and isoelectric point properties of proteins to enhance the responsiveness and sensitivity of pH detection, achieving both fast response and high precision
2Measurement precision
If a wide pH range indicator is used for vaginal secretion samples, then broad detection coverage is achieved, but the ability to indicate specific pH thresholds is lost
Solution Approach 1:
The patent applies local quality by selecting proteins with specific isoelectric points tailored to target particular pH thresholds (e.g., pI 4.0-5.0 for vaginal secretion detection). This allows the indicator to concentrate its detection capability at specific pH ranges rather than distributing it uniformly across a wide range, enabling precise threshold indication while maintaining adaptability through selection of different proteins for different applications
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 indicator provides rapid and sensitive pH detection by producing an obvious color change at specific pH thresholds, enabling precise detection of pH values in human metabolites using a solid matrix.
Implementation Method 1
Acid-base indicators are a class of organic compounds, inorganic compounds and combinations thereof that reflect changes in pH through color changes within a specific pH range
Implementation Method 2
a protein having an isoelectric point of 3.0-10.0 and a molecular weight of 10 kDa-200 kDa
Data Source
AI summary
The present invention provides an indicator rapidly responding to a subtle pH change, comprising of an acid-base indicator, a stable protein having an isoelectric point of 3.0-10.0 and a molecular weight of 10 kDa-200 kDa, and a buffer solution. The color change interval of the indicator of the present invention can be controlled within a pH range of 0.1-0.2, the color change is obvious, and a solid matrix containing the indicator can be used for rapid detection of pH in different human metabolites.