What Is Photoelectrochemical Immunoassay Development?
Photoelectrochemical (PEC) immunoassays combine the high specificity of antibody‑based recognition with the sensitivity of photo‑induced charge transfer. By using tailored photoactive materials—such as defect‑engineered heterojunctions, quantum dots, or layered semiconductors—PEC platforms can detect biomarkers at concentrations orders of magnitude lower than conventional colorimetric or electrochemical methods.
Our service provides end‑to‑end development of PEC immunoassays for biotech and pharmaceutical clients. We design photoanodes or photocathodes with optimal band alignment, immobilize capture antibodies, and optimize signal‑readout conditions. The result is a robust, reproducible assay that meets the sensitivity requirements of therapeutic monitoring and early‑diagnostic applications.
Each project is scoped to the biomarker of interest, target matrix (serum, plasma, lysate), and desired limit of detection. We work iteratively, from material synthesis and electrode fabrication through assay validation, delivering a documented protocol ready for translation to routine use.
Our PEC Immunoassay Development Services
Photoactive Electrode Design & Synthesis
We select and fabricate photoactive materials (e.g., metal‑sulfide heterojunctions, carbon‑nitride composites) that maximize photocurrent generation and stability. Electrode architectures are customised to your biomarker and detection range.
Antibody Immobilization & Assay Optimization
Our team engineers the bio‑interfacial layer—antibody orientation, blocking, and washing steps—to minimise nonspecific binding while preserving antigen capture efficiency. Parameters are fine‑tuned to achieve the lowest possible background signal.
Validation & Performance Characterization
We deliver a full characterization package: photocurrent response, limit of detection, linear range, specificity against interferents, and spike‑recovery data. Assay reproducibility is assessed across multiple electrode batches and operators.
Collaborative Development Process
We begin with a detailed discussion of your biomarker target, intended matrix, and required sensitivity. Together we define the project scope, material choices, and success criteria.
Our chemists synthesise and characterise photoactive materials (e.g., Z‑scheme heterojunctions, quantum‑dot assemblies) with appropriate band gaps and charge‑separation properties for your assay.
We deposit the photoactive film onto conductive substrates (ITO, FTO, or screen‑printed electrodes) and functionalise the surface with capture antibodies using optimised cross‑linking chemistry.
Using a standard three‑electrode PEC cell with controlled illumination, we measure photocurrent before and after biomarker binding. Parameters such as bias voltage, light intensity, and incubation time are systematically optimised.
We validate the assay performance with spiked matrix samples and provide a comprehensive report including calibration curves, LOD calculation, specificity data, and batch reproducibility statistics.
Deliverables & Scope
| Item | Description |
|---|---|
| Optimised PEC Assay Protocol | Step‑by‑step documentation covering electrode preparation, antibody immobilisation, measurement conditions, and data analysis pipeline. |
| Performance Data Package | Limit of detection, linear dynamic range, reproducibility (%CV), spike‑recovery rates, and cross‑reactivity profile against relevant interferents. |
| Custom Photoactive Electrodes | A batch of functionalised electrodes (quantity scoped per project) with stability data and storage recommendations. |
Why Photoelectrochemical Immunoassays?
Ultrasensitive Detection
PEC platforms routinely achieve detection limits in the femto‑ to picomolar range, enabling quantification of low‑abundance biomarkers that are inaccessible to standard ELISA or chemiluminescent assays.
Low Background & High Specificity
Because the optical excitation and electrochemical readout are decoupled, PEC assays exhibit inherently low background signals. Combined with antibody‑based capture, this yields excellent specificity even in complex biological matrices.
Featured Scientific Publication
Recent Advances
Ultrasensitive Photoelectrochemical Immunoassay Strategy Based on Bi₂S₃/Ag₂S Heterostructures for Biomarker Detection
View on PubMedReady to Advance Your Biomarker Detection?
Partner with our experienced team to develop a photoelectrochemical immunoassay tailored to your diagnostic or therapeutic monitoring needs. We work confidentially and deliver a validated protocol supported by full characterization data.