Filter Paper with Radical Inhibitor for NAD+ Stability
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Solution Overview
Problem
The existing dried blood spot (DBS) method for quantifying NAD+ and NMN suffers from inaccurate quantification due to storage conditions affecting the decomposition of these molecules and poor storage stability of the quantifying target substances on filter paper.
Innovation Solution
A method involving the use of filter paper impregnated with a radical inhibitor or a chaotropic agent, which is brought into contact with a solvent to extract NAD+ or NMN, followed by quantification using techniques such as mass spectrometry or colorimetric methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the DBS method is used to quantify NAD+ and NMN without special processing, then the operation is simplified and self-collection is enabled, but the quantification accuracy deteriorates due to decomposition under storage conditions
Solution Approach 1:
The filter paper is pre-impregnated with radical inhibitors or chaotropic agents before use. This preliminary preparation ensures that when blood is spotted on the filter paper, the additives are already in position to protect NAD+ and NMN from decomposition during storage, eliminating the need for subsequent special processing while maintaining quantification accuracy
Solution Approach 2:
Radical inhibitors and chaotropic agents are introduced as intermediary substances that mediate between the blood sample and the storage environment. These additives act as protective intermediaries that prevent direct harmful interactions between storage conditions and NAD+/NMN, thereby maintaining molecular stability without complicating the操作流程
2Adaptability or versatility
If blood is dropped onto filter paper for DBS method, then easy delivery to testing institutions is enabled, but storage stability deteriorates depending on the quantifying target substance
Solution Approach 1:
The filter paper is impregnated with different additives (radical inhibitors or chaotropic agents) tailored to protect specific target substances. This local quality enhancement ensures that the filter paper has the appropriate protective properties for the specific NAD+ or NMN being measured, improving storage stability while maintaining delivery convenience
3Reliability
If quick freezing is performed for NAD+ and NMN quantification, then decomposition is prevented, but the operation complexity increases and self-collection is no longer feasible
Solution Approach 1:
The filter paper with impregnated additives performs self-protection function for NAD+ and NMN. The radical inhibitors and chaotropic agents automatically protect the target molecules from decomposition under storage conditions without requiring external intervention such as quick freezing, thereby maintaining reliability while keeping the operation simple and self-collection feasible
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 provides improved storage stability for NAD+ and NMN, enabling accurate quantitative analysis using the DBS method.
Implementation Method 1
a filter paper, impregnated with a radical inhibitor or a chaotropic agent
Implementation Method 2
a filter paper, impregnated with a radical inhibitor or a chaotropic agent
Implementation Method 3
bringing a filter paper, impregnated with a radical inhibitor or a chaotropic agent, and with added blood derived from the test subject, into contact with a solvent
Data Source
AI summary
A method for quantifying nicotinamide adenine dinucleotide (NAD+) or nicotinamide mononucleotide (NMN) includes: Step 1 of bringing a filter paper, impregnated with a radical inhibitor or a chaotropic agent, and with added blood derived from a test subject, into contact with a solvent; and Step 2 of quantifying the nicotinamide adenine dinucleotide (NAD+) or nicotinamide mononucleotide (NMN) in the solvent obtained in Step 1.