Development Trends of the POCT Rapid-Testing Industry and Changing Electrode Requirements
| Author: Huili Biotech Technical Team
Trend 1: Chip-Level Miniaturization and Microfluidic Integration
POCT (point-of-care testing) is evolving from "a simplified benchtop device" toward "a chip-level diagnostic system." Microfluidics integrates sample loading, reaction, separation, and detection onto a strip structure of just a few square centimeters, cutting sample volume from hundreds of microliters to only a few, and test time to tens of seconds. Miniaturization raises the bar for electrodes: finer pattern line widths and smaller effective reaction areas demand more uniform and cleaner electrode surfaces—precisely the strengths of precious-metal electrodes made by magnetron sputtering, whose dense films and low surface roughness fit the precision-detection requirements of microfluidic channels.
Trend 2: Multi-Analyte Panels and Home Self-Testing
A second major trend is the rapid expansion of multi-analyte panels and home self-testing. A single strip that measures glucose and ketones, or uric acid and lactate, requires multiple working electrodes on one substrate with tightly controlled batch-to-batch consistency; otherwise, systematic error across channels is directly amplified. Home self-testing moves the use environment from the laboratory into non-professional hands, so strips must remain stable across wider ranges of temperature, humidity, and hematocrit—an ongoing challenge for electrode material stability and anti-interference capability.
The Electrode: The Core Component of a POCT Strip
In an electrochemical POCT strip, the electrode is the only component that directly participates in signal transduction: the analyte undergoes redox reactions on the working-electrode surface, and the resulting current determines the sensitivity and accuracy of the test. Material purity, film thickness, surface condition, and pattern precision together define a strip's linear range, limit of detection, and batch-to-batch repeatability. In a very real sense, the performance ceiling of a POCT strip is largely set at the electrode-manufacturing stage.
Electrode Material Requirements by Test
| Test | Common Electrode Material | Key Requirements |
|---|---|---|
| Blood glucose monitoring | Sputtered gold, screen-printed carbon | High conductivity, good compatibility with glucose-oxidase systems, low-cost mass production |
| Blood ketone testing | Sputtered gold | High-purity surface (Au ≥ 99.99%), low background current, long-term storage stability |
| Blood gas analysis | Sputtered platinum | Excellent electrocatalytic activity, wide potential window, corrosion resistance |
| Uric acid / lactate testing | Gold or carbon electrodes | Surface modifiability, strong adhesion of anti-interference coatings |
Choosing the right material is only the first step; film quality and pattern precision are what translate material advantages into strip performance.
How Precious-Metal Sputtered Electrodes Enable the POCT Upgrade
Compared with conventional screen printing, magnetron sputtering deposits atom by atom in vacuum, achieving nanoscale film-thickness control with minimal batch-to-batch variation—ideal for miniaturized electrode patterns and multi-channel panels. Chemically stable precious-metal layers such as gold and platinum resist oxidation during long-term storage, extending strip shelf life. And the strong bonding between sputtered films and flexible substrates such as PET provides a process foundation for emerging POCT form factors, including wearables and microfluidic devices. In short, advances in sputtering and the evolution of POCT reinforce each other.
Huili Biotech's One-Stop Strip OEM/ODM Capability
Based in Changzhou, Jiangsu, Huili Biotech (Changzhou) Co., Ltd. provides POCT customers with one-stop OEM/ODM services spanning precious-metal sputtered electrodes and in vitro diagnostic test strips: a full material system covering sputtered gold, platinum, and silver electrodes plus screen-printed carbon electrodes; customized electrode patterns and film structures; 1–2 weeks for samples and 2–4 weeks for batch delivery; and batch CV ≤ 5%. Whether rapidly validating a miniaturized new product or scaling up a multi-analyte strip, a stable electrode supply chain is a prerequisite for success—and that is exactly where Huili Biotech continues to invest.