LC-MS/MS Ceruloplasmin Activity Assay Using an Oxidizable Substrate
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Solution Overview
Problem
Current methods for measuring ceruloplasmin activity, such as colorimetric assays, lack sensitivity and stability, and no reliable substrates exist for liquid chromatography-tandem mass spectrometry (LC-MS/MS) assays.
Innovation Solution
A compound of formula I is used as a substrate in mass spectrometry to determine ceruloplasmin activity, producing an oxidized product measurable by mass spectrometry, allowing for reliable and sensitive detection with trace amounts of biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If colorimetric enzymatic assay is used to measure serum oxidase activity, then the measurement can be performed with conventional equipment, but the sensitivity is constrained and stability is challenged
Solution Approach 1:
The patent replaces the optical detection system (colorimetric/photometric readers) with a mass spectrometry detection system. This substitution enables precise quantification of the substrate compound and its oxidized product at trace levels, resolving the sensitivity limitation of colorimetric methods while maintaining measurement stability through the high precision of mass spectrometry.
Solution Approach 2:
The patent changes the detection parameter from optical absorbance (colorimetric) to mass-to-charge ratio (mass spectrometry). This parameter change allows for highly sensitive and specific detection of the substrate and product molecules, overcoming the sensitivity constraints of conventional colorimetric assays while providing stable and reliable measurements.
2Measurement precision
If LC-MS/MS based assay is used for enzyme activity analysis, then high sensitivity detection is achieved, but no reliable substrates are available for serum Cp activity measurement
Solution Approach 1:
The patent introduces a specifically designed substrate compound (formula I) as an intermediary that bridges the capability of LC-MS/MS detection and the need for reliable ceruloplasmin activity measurement. This substrate is optimized to produce a detectable oxidized product with distinct mass spectral characteristics, enabling both high sensitivity and reliability in Cp activity assays.
Solution Approach 2:
The patent modifies the substrate structure (formula I with specific R1-R4 groups) to optimize its properties for LC-MS/MS detection. The structural parameters are changed to ensure the substrate and its oxidized product have suitable mass-to-charge ratios and ionization characteristics, making the assay both sensitive and reliable for ceruloplasmin activity measurement.
3Ease of operation
If conventional colorimetric assay is used, then the oxidized product can be measured by UV/Vis photometric readers, but the oxidized product forms unclear polymeric forms indicating constrained sensitivity
Solution Approach 1:
The patent replaces the UV/Vis photometric detection system with mass spectrometry detection. This substitution provides clear identification and quantification of the oxidized product based on its precise mass-to-charge ratio, eliminating the ambiguity of polymeric form detection in colorimetric assays while maintaining operational simplicity through automated LC-MS/MS analysis.
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 achieves high sensitivity and reliability in determining ceruloplasmin activity, enabling prediction of related diseases with minimal sample volume requirements.
Implementation Method 1
contacting a biological sample containing ceruloplasmin with a compound of formula I under a condition such that the compound reacts with the ceruloplasmin to produce an oxidized product of the compound
Data Source
AI summary
Disclosed is a method of determining ceruloplasmin activity using a mass spectrometry technique. The method comprises reacting a biological sample containing ceruloplasmin with a compound of formula I to produce an oxidized product of the compound, measuring a level of the oxidized product by a mass spectrometry technique, and determining a level of ceruloplasmin activity based on the level (amount) of the oxidized product.