Lateral Flow Test Pad for Saliva Analysis
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Solution Overview
Problem
Lateral flow test arrangements for saliva analysis suffer from poor fluid flow, low analyte concentration, and inaccurate sample volume, leading to unreliable test results due to chromophore-aggregation and sensitivity issues.
Innovation Solution
A lateral flow test arrangement with specific polymeric pads and treatments, including a glass microfiber sample pad treated with buffer salt and surfactant solutions, a conjugate pad with carboxyl-modified gold particles, and a nitrocellulose membrane with perpendicular test and control lines, optimized for saliva detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lateral flow test arrangements are used for saliva analysis, then the device is simple and easy to operate, but the fluid flow is poor and test results are unreliable
Solution Approach 1:
The patent changes the material parameter of the sample pad from conventional materials to glass microfiber material with specific wicking rate (3-5 s/2cm) and water absorption capacity (35-40 mg/cm²), which fundamentally alters the fluid flow characteristics and resolves the contradiction between reliability and flow speed
Solution Approach 2:
The patent applies a composite treatment to the sample pad by combining buffer salt solutions (such as HEPES, NaCl, KCl, CaCl₂, EDTA, CTAB, or chitosan) and surfactant solutions (specifically Pluronic® F-127 at 0.1-10% w/v), creating a composite material that simultaneously improves wicking performance and prevents chromophore aggregation
2Measurement precision
If conventional sample pads are used, then the device structure is simple, but chromophore aggregation occurs and sensitivity decreases
Solution Approach 1:
The sample pad is pre-treated with buffer salt and surfactant solutions before the test is performed. This preliminary action prepares the pad to prevent chromophore aggregation and ensure proper fluid flow, thereby improving sensitivity without adding complexity during actual test operation
Solution Approach 2:
The buffer salt and surfactant solutions act as intermediary substances that mediate between the saliva sample and the conjugate pad, preventing direct harmful interactions that cause chromophore aggregation while maintaining detection sensitivity
3Manufacturing precision
If standard polymeric pads are used, then manufacturing is straightforward, but sample volume accuracy is poor
Solution Approach 1:
The patent specifies precise parameter ranges for the glass microfiber sample pad including wicking rate (3-5 s/2cm) and water absorption capacity (35-40 mg/cm²), which enables accurate sample volume control while maintaining ease of manufacture through standardized production parameters
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
Improves fluid flow and sensitivity, ensuring unambiguous test and control line signals, enhancing the reliability and accuracy of saliva-based analyte detection.
Implementation Method 1
a fluid sample (analyte fluid) containing the analyte of interest (e.g. a hormone in saliva) is applied to one end of the test strip, i.e. on the first polymeric pad so called sample pad, and moves by means of capillary forces through various functional areas of sequentially arranged polymeric pads along the test strip
Implementation Method 2
The sample pad has been treated with solutions of a buffer salt and/or solutions of a surfactant prior to contacting the sample area with a fluid sample to be tested
Data Source
Figure 1
AI summary
Lateral flow test arrangement suitable for detection of an analyte in saliva, the arrangement comprising a carrier and a sequence of different polymeric pads arranged on said carrier, wherein said sequence of polymeric pads comprises in flow direction. A sample pad composed of glass microfiber material, preferably glass microfiber material having a wicking rate of 3 to 5 s/2cm, water absorption capacity of 35 to 40 mg/cm2 and a density of 0,18 to 0,2 g/cm3 comprising a sample area (adapted) for receiving a fluid sample to be analysed ; a conjugate pad comprising a conjugate area, said conjugate area comprising a conjugate, the conjugate area (adapted) for contacting the fluid sample with the conjugate, the conjugate comprising a binding moiety specific for the analyte and a detection moiety; a membrane pad comprising a detection area (adapted) for detection of analyte in the sample, the detection area comprising a test line and a control line arranged perpendicular to the flow direction, wherein the control line is arranged in flow direction downstream of the test line, wherein said test line comprises a compound which is bound specifically by the binding moiety of the conjugate (or a compound which binds specifically to the analyte), and wherein the control line comprises a compound which binds specifically to the binding moiety of the conjugate; and a wicking pad comprising a wicking area (adapted) for establishing fluid transport from the sample area to the wicking area.