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In vitro diagnostic electrochemical sensors and material solutions
There are more than 500 million diabetes patients worldwide, and tens of millions of blood glucose tests are completed in families and clinics every day. Behind each test, a miniature electrochemical sensor completes the entire process from "biometric recognition" to "electrical signal output" in milliseconds.
The core of a blood glucose test strip is a three electrode electrochemical sensor - glucose oxidase (GOx) is fixed on the working electrode, providing a current loop to the electrode, and the reference electrode maintains a stable potential. When a blood sample is dropped into the test strip, glucose reacts specifically with GOx to produce electroactive substances (hydrogen peroxide). A constant voltage is applied to the working electrode, and hydrogen peroxide is oxidized on the electrode surface, releasing electrons - the number of electrons is proportional to the concentration of glucose. The instrument measures this current and converts it into blood glucose concentration.
Core proposition:This seemingly simple process involves the three core engineering propositions of in vitro diagnostic sensors: biometric recognition (specific binding of enzymes to target molecules), signal transduction (conversion of biochemical reactions into electrical signals), and signal amplification and output (precise measurement of weak currents).
In vitro diagnostic sensors are a type of analytical device that integrates biometric elements (enzymes, antibodies, nucleic acid aptamers, etc.) with physical or chemical signal converters. They can convert the concentration or activity of the biological molecules (glucose, proteins, nucleic acids, ions, etc.) being tested into quantifiable electrical, optical, or mass signals.
The catalytic specificity of enzymes, antigen binding of antibodies, and base pairing of nucleic acid probes are responsible for "sniffing out" target molecules.
Electrochemistry (current/potential/impedance), optics (fluorescence/colorimetry), piezoelectricity, thermosensitive - convert recognition events into measurable signals.
Amplification, filtering, analog-to-digital conversion, algorithm compensation - ultimately displayed as concentration values.
Among various in vitro diagnostic sensors, electrochemical biosensors are the most widely used. According to different detection principles, electrochemical sensors are mainly divided into three working modes:
Apply a constant potential and measure the redox current. Current is proportional to concentration - blood glucose test strips are a typical representative.
Measure potential at zero current, and the potential is linearly proportional to the logarithm of ion concentration - pH electrode, ion selective electrode.
Measure the change in interface charge transfer resistance for label free immunoassay and nucleic acid hybridization.
The electrode is the core component of electrochemical sensors - biometric events ultimately need to be converted into electrical signals on the electrode surface. The selection of electrode materials directly affects the sensitivity, stability, response speed, and biocompatibility of sensors.
| electrode material | Core advantages | Typical Applications |
|---|---|---|
| Gold (Au) | Chemical inertness, excellent biocompatibility, stable signal transmission | Gold plated blood glucose test strip, biosensor electrode |
| Platinum (Pt) | High electrocatalytic activity, fast response speed, and long-term stability | Glucose sensor, biosensing slurry, co fired electrode |
| Silver/Silver Chloride (Ag/AgCl) | Low polarization potential and good electrochemical stability | Reference electrode, biopotential measurement, DNA/protein detection |
| Silver platinum composite (Ag/Pt) | Highly conductive catalytic activity antibacterial | ECG/EEG electrodes, blood glucose sensors, medical sensor electrodes |
Key parameters:The resistivity of YB8203 co fired platinum electrode slurry from Yanbo brand is 1.65 μ Ω· cm, and the tensile strength is 280MPa; YB8201 square resistance is 20 ± 5m Ω/□, and the dispersion of platinum particles is increased by 40%.
Commonly used substrates for disposable sensors such as blood glucose test strips. Advanced Institute Technology PET platinum/gold plating film combines mechanical properties and electrochemical characteristics.
Sensors that require higher temperature resistance and dimensional stability can have substrates as thin as 5 μ m.
Transmittance ≥ 90%, suitable for optical detection and electrochemical combination scenarios.
Advanced Institute (Shenzhen) Technology Co., Ltd. was established in 2016 and is a national high-tech enterprise specializing in flexible substrate coating, shielding materials, absorbing materials, and precious metal pastes. The company has independently built a magnetron sputtering and vacuum evaporation production line, using roll to roll continuous production technology, which can achieve precise deposition of metal layers on various flexible film surfaces such as PET, PI, FEP, etc.
The blood glucose test strip provides a stable current transmission path, reduces signal loss, and ensures measurement accuracy and repeatability.
Combining mechanical and electrochemical properties, accurately capturing trace changes in biomolecules.
XJY-YB-8840 is designed specifically for glucose sensors, with a response time of milliseconds and simulating fluid stability for 3 months. YB8201 square resistance is 20 ± 5m Ω/□, and the dispersion of platinum particles is increased by 40%.
YB8203 has a resistivity of 1.65 μ Ω· cm (decreased by 21%) and a tensile strength of 280MPa (increased by 17%); YB8301 silver platinum paste is used for ECG/EEG and blood glucose electrodes, possessing conductivity, catalysis, and antibacterial properties.
Other slurries:Gold paste, silver chloride silver paste, silver carbon paste, platinum carbon paste, carbon paste, etc., meet the diverse needs of electrochemical biosensors.
The essence of in vitro diagnostic sensors is to translate the "chemical language" of the biological world into the "electrical signal language" of the electronic world. Enzymes, antibodies, or nucleic acid probes are responsible for recognition - accurately finding target molecules in complex biological samples; Gold, platinum, or silver/silver chloride electrodes are responsible for conversion - amplifying the weak chemical changes produced by biochemical reactions into measurable currents or potentials.
From a drop of fingertip blood to real-time data streams for continuous blood glucose monitoring, from immunological analysis in the laboratory to wearable health monitoring in the home - in vitro diagnostic sensors are bringing medical testing from hospitals to homes and moving from centralized to distributed. In this technological evolution, the selection of electrode materials and precision machining processes have always been the core variables that determine the sensitivity, stability, and reliability of sensors.
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