Radetec works with fluorescent quantum dots from particle surface to assay readout. Explore CdSe/ZnS plus the cadmium-free InP/ZnS and CuInS₂/ZnS options, with conjugation tailored to your antibody, target and test format.
From the particle to a measurable signal.
Quantum dots (QDs) are semiconductor nanocrystals whose optical properties can be tuned through their composition and structure. In an assay, their usefulness depends on the full system: particle brightness, surface chemistry, biomolecule activity, background signal and reader settings.
We bring material selection and assay development together, so the QD conjugate is evaluated in the workflow where it will actually be used.
We choose and optimise a QD system around your assay requirements, sample matrix and intended readout.
A CdSe core with a ZnS shell is a well-established fluorescent quantum dot architecture. We evaluate its optical signal, surface coating and conjugation chemistry for the intended assay rather than selecting a label on brightness alone.
An indium phosphide core with a zinc sulfide shell offers a cadmium-free fluorescent QD option. Surface chemistry, dispersion stability and retained fluorescence after bioconjugation are assessed for the intended assay.
Copper indium sulfide QDs with a ZnS shell provide another cadmium-free route. We develop the coating and conjugation in parallel with the fluorescence readout and sample workflow.
Cadmium-free describes material composition; assay suitability and performance are assessed for the specific application.
We develop QD bioconjugates with attention to both sides of the interface: maintaining a stable, bright particle and preserving the binding activity of the attached biomolecule.
Adapt the coating and aqueous dispersion to the conjugation route and assay conditions.
Optimise coupling and loading for antibodies or other suitable recognition molecules.
Evaluate fluorescence, aggregation, non-specific binding and retained recognition activity.
Assess the conjugate in the intended strip, buffer, sample matrix and reader workflow.
Our QD expertise supports fluorescent lateral flow assay development, reader-assisted detection and custom bioconjugation. A project can start with a particle, an antibody pair or a target that still needs an assay format.
Share your target, antibody or ligand, sample type and preferred readout. We can discuss a conjugation study or a broader assay development project.
Discuss your QD project