Saliva Lateral Flow Sampling With Cellulosic Pre-Concentration
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Solution Overview
Problem
Existing lateral flow tests for detecting analytes in saliva are not sufficiently sensitive and reliable, presenting a trade-off between convenience and accuracy, with current methods failing to reliably detect human chorionic gonadotropin (HCG) in saliva.
Innovation Solution
A method involving a cellulosic stationary phase, such as cotton and carboxymethyl cellulose, is used to absorb saliva, followed by the introduction of an eluent like albumin and a polyoxyethylene-polyoxypropylene block copolymer, which enhances analyte detection by increasing sensitivity and reproducibility through a simple operation using a plunger system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lateral flow dipstick tests are used to detect analytes in saliva, then convenience is improved, but sensitivity and reliability deteriorate
Solution Approach 1:
The patent applies preliminary action by introducing a stationary phase (cellulosic material) that pre-concentrates the analyte from the saliva sample before the lateral flow detection occurs. This pre-processing step within the device itself enhances sensitivity without requiring separate concentration steps, thus maintaining convenience while improving reliability
Solution Approach 2:
The patent uses an intermediary substance (protein such as albumin or polyoxyethylene-polyoxypropylene block copolymer) that mediates between the saliva sample and the detection system. This intermediary enhances analyte recovery and detection sensitivity by facilitating analyte transfer or protecting analyte integrity, thereby improving reliability while maintaining the simplicity of saliva-based testing
2Ease of operation
If lateral flow dipstick tests are used to detect analytes in saliva, then ease of sampling is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by creating a specific zone within the lateral flow device where the stationary phase is positioned to selectively concentrate analytes from the saliva sample. This localized concentration zone enhances detectability at the critical detection point without affecting the overall ease of sampling, thereby improving measurement precision while maintaining sampling convenience
Solution Approach 2:
The patent changes physical or chemical parameters within the device by using a stationary phase that alters the local concentration, binding affinity, or recovery efficiency of the analyte. This parameter change occurs locally at the detection interface, enhancing measurement precision without requiring changes to the sampling procedure itself
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 significantly improves the detectability of analytes like HCG in saliva, allowing for accurate determination of pregnancy or other conditions by enhancing the sensitivity and specificity of lateral flow tests.
Implementation Method 1
introducing the body fluid into a stationary phase (e.g., passing the body fluid through the stationary phase) prior to analyzing the body fluid
Implementation Method 2
an eluent is also introduced into the stationary phase... the eluate derived from the body fluid emerges from the stationary phase
Data Source
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AI summary
A method, comprising: using: an elongate barrel (162), the barrel shaped to define a channel (164) therethrough, and having: an opening (166) into the channel (164) at a proximal region of the barrel (162), and an outlet (168) from the channel (164) at a distal region of the barrel (162), a porous carrier (170), disposed within the channel (164), a surfactant, held in the carrier (170), a cellulosic stationary phase (164), disposed within the channel (164) between the carrier (170) and the distal region of the barrel (162), and a lateral flow platform (190), coupled to the distal region of the barrel (162) such that a sample pad of the lateral flow platform (190) is in fluid communication with the outlet (168): introducing a sponge (130) holding a sample of a body fluid, the sponge (130) coupled to a distal portion (124) of a plunger (122), into the opening (166) of the channel (164); and sliding the distal portion (124) of the plunger (122) distally through the channel (164), thereby compressing the sponge (130) within the channel (164) and driving the sample: out of the sponge (130) and through the carrier (170), dissolving at least some of the surfactant, with the dissolved surfactant, into the stationary phase (164), and as an eluate, out of the stationary phase (164), through the outlet (168), and onto the sample pad of the lateral flow platform (190).