One of the most common questions we receive at Zimmer & Peacock is not whether a biosensor can be built, but whether it can become a successful product.
Recently, we received an enquiry about the technical feasibility, manufacturability, clinical validation requirements, and commercial viability of a novel electrochemical biosensor concept. To respect confidentiality, both the application and the enquirer have been anonymized.
The question, however, is highly relevant to anyone developing a medical diagnostic based on electrochemical sensing.
The short answer?
Technically, many electrochemical biosensor concepts are absolutely feasible. Commercially, the challenge is often much harder.
π₯ Watch the Full Discussion
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Video: Electrochemical Biosensor Feasibility, Manufacturing & Clinical Validation
π¬ Technical Feasibility: Is the Science Sound?
The biosensor concept under discussion involved an aptamer-based sensing strategy combined with a ratiometric electrochemical measurement approach.
From a technical perspective, this is a strong foundation.
Why Aptamers?
Aptamers have become increasingly popular within electrochemical biosensing because they offer:
- High specificity
- Compatibility with electrochemical measurements
- Relatively straightforward surface immobilization
- Potentially lower costs compared with antibodies
Particularly on gold electrodes, aptamers integrate well with self-assembled monolayer (SAM) chemistries. The attachment process is well established within the scientific literature and can often be implemented using straightforward surface chemistry techniques.
For researchers developing proof-of-concept systems, aptamers remain one of the most attractive recognition elements available today.
β« Gold vs Carbon: Think About Commercialization Early
One of the biggest mistakes biosensor developers make is selecting electrode materials solely based on laboratory convenience.
Gold electrodes are widely used in academic publications because:
- Surface chemistry is well understood
- SAM formation is straightforward
- Large volumes of literature already exist
However, if commercialization is the long-term goal, cost becomes extremely important.
Why Consider Carbon Instead?
Carbon electrodes offer significant advantages when developing products intended for manufacturing at scale.
Some key benefits include:
- Lower material costs
- Established screen-printing manufacturing processes
- Scalable production
- Excellent electrochemical performance
- Compatibility with many biosensing chemistries
For a deeper discussion of the practical trade-offs between carbon, gold, and platinum electrodes, see:
π Further Reading
Carbon vs Gold vs Platinum Electrodes: Practical Trade-Offs for Real-World Biosensor Development
When building a commercial diagnostic, every component contributes to the eventual cost of goods. Decisions made during early research often determine whether a product can achieve economic viability later.
π§ͺ Functionalizing Carbon Electrodes
Many developers assume sophisticated functionalization methods are required for carbon-based biosensors.
In reality, several proven approaches already exist.
One particularly useful chemistry is:
Pyrene Butyric Acid NHS Ester
The pyrene group adsorbs strongly onto carbon surfaces through Ο-Ο interactions while the NHS ester enables conjugation to biological molecules.
This allows attachment of:
- Aptamers
- Antibodies
- Proteins
- Other recognition elements
The scientific literature contains numerous examples demonstrating successful use of pyrene-based surface chemistry in electrochemical biosensor development.
For developers interested in lowering manufacturing costs while retaining robust chemistry, this route is worth serious consideration.
π The Power of Ratiometric Sensing
One aspect of the enquiry involved a ratiometric sensing strategy.
This approach is particularly attractive because it can compensate for many common sources of measurement variation.
The concept is straightforward:
- One redox reporter responds to the analyte of interest.
- One redox reporter acts as an internal reference.
- The signal is calculated using the ratio between the two.
Rather than relying solely on absolute signal intensity, the system continuously compares the sensing signal against a stable reference.
This can help reduce the impact of:
- Manufacturing variability
- Surface differences
- Environmental effects
- Signal drift
- Certain forms of interference
π Lessons from Professor Richard Compton's Work
A useful example comes from the work of Professor Richard Compton of Oxford University.
His research demonstrated the use of multiple redox probes attached to electrode surfaces, where:
- One probe exhibited sensitivity to a variable.
- Another probe acted as a stable reference.
Using voltammetric techniques, the changing signal could be compared against the stable reference signal, creating a more robust measurement strategy.
While commercial implementations of these ideas have been attempted over the years, the broader principle remains highly relevant:
A built-in internal reference can significantly improve sensor robustness.
For many biosensor applications, this remains a highly attractive design philosophy.
π Can This Be Manufactured?
The answer is generally yes.
Many academic researchers use drop-casting methods during development.
Typically this involves:
- Preparing a functionalization solution.
- Pipetting onto the working electrode.
- Allowing drying or incubation.
- Performing measurements.
Some people worry that this approach cannot scale.
In practice, it absolutely can.
Manual Pipetting vs Automation
At the research stage:
- Manual pipetting is often sufficient.
At development and manufacturing scale:
- Automated liquid handling systems can perform the same process with far greater consistency.
The important point is that many laboratory workflows can be translated directly into automated production workflows later.
π The Real Manufacturing Challenge: Reproducibility
Manufacturing is not usually limited by the ability to print electrodes.
Instead, the challenge is reproducibility.
Many academic studies present impressive sensor results based on small sample sizes.
Commercial manufacturing requires something very different.
You must know:
- How much electrodes vary
- Whether performance is statistically controlled
- Whether large production batches behave consistently
Strong manufacturing processes deliberately sacrifice and test electrodes to evaluate production quality.
Without that information, commercialization becomes significantly more difficult.
π§ͺ Validation Begins with Analytical Performance
Once a sensor is fabricated, the first milestone is simple:
Can it detect the analyte?
Typically, this starts by generating concentration curves in controlled buffer systems.
Analyte concentration β Sensor response
If a clear relationship exists, then analytical performance has been demonstrated.
This is an important milestone.
Unfortunately, it is only the beginning.
π©Έ The Next Step: Real Sample Testing
Many sensors perform brilliantly in buffer.
Far fewer perform well in real biological samples.
The next challenge is testing in:
- Blood
- Serum
- Plasma
- Urine
- Saliva
- Other clinically relevant matrices
The question becomes:
Can the sensor still maintain analytical performance when exposed to the complexity of real patient samples?
Answering this question often reveals challenges not visible during early-stage development.
π₯ Clinical Validation Is Where Things Get Serious
Clinical validation represents a completely different level of evidence.
At this stage, it is no longer enough to demonstrate that a sensor generates a signal.
Instead, the key question becomes:
Does the Result Change Clinical Outcomes?
A diagnostic test only creates value if it influences decision-making.
The pathway generally looks like this:
- The sensor measures a biomarker.
- A clinician receives the result.
- The clinician takes action.
- The action improves patient outcomes.
If improved outcomes cannot be demonstrated, adoption becomes much more difficult.
π° Medical Economics Matters
Perhaps the most overlooked aspect of biosensor development is economics.
Even if a device works perfectly:
- Hospitals must justify purchasing it.
- Healthcare systems must fund it.
- Reimbursement pathways may be required.
- Budget holders must see value.
Doctors Are Not Always Buyers
It is common for clinicians to express enthusiasm for a new diagnostic technology.
However, enthusiasm does not necessarily translate into purchasing decisions.
The people controlling budgets may be entirely different stakeholders.
Successful commercialization therefore requires answering questions such as:
- Does the test save money?
- Does it improve efficiency?
- Does it improve outcomes?
- Does it reduce treatment costs?
- Does it reduce hospital admissions?
These questions are often just as important as technical performance.
π― Final Thoughts
For developers considering aptamer-based electrochemical biosensors, the overall outlook is encouraging.
The scientific foundations are strong.
The manufacturing route is realistic.
The sensing strategy discussed here has sound electrochemical reasoning behind it.
However, success ultimately requires more than a good signal.
To maximize your chances of success:
- β Consider commercialization requirements early.
- β Explore carbon electrodes rather than automatically choosing gold.
- β Build reproducibility into development from the beginning.
- β Validate in real sample matrices as soon as possible.
- β Think beyond analytical performance and focus on clinical utility.
- β Develop a compelling economic argument for adoption.
Building a biosensor is challenging.
Building a biosensor company is harder.
Building a biosensor that changes clinical practice is harder still.
Yet for teams that successfully combine technical innovation, manufacturing excellence, clinical evidence, and economic value, the opportunity remains enormous.
π Useful Resources
Screen Printed Electrodes
https://shop.zimmerpeacock.com/en-gb/collections/bare-electrodes
Recommended Electrode Solutions & Accessories
https://shop.zimmerpeacock.com/en-gb/collections/solutions
Biosensor Development Platforms
https://shop.zimmerpeacock.com/en-gb/pages/sensors
Recommended Biosensor Chemicals & Solutions
https://shop.zimmerpeacock.com/en-gb/collections/chemical-and-solutions
Carbon vs Gold vs Platinum Electrodes
SenseItAll Potentiostat
https://shop.zimmerpeacock.com/en-gb/products/senseitall-sia-generation-4-device-only
