Custom Probe Design & Engineering Service

We first clarify the client's biological question, technical expectations, and downstream assay requirements to define a practical probe development direction.

• Define the mitochondrial process or analyte of interest, such as ΔΨm, H₂O₂, superoxide, GSH/GSSG ratio, ATP/ADP, NADH/NAD⁺, Ca²⁺, Mg²⁺, pH, mitophagy, fusion/fission, MitoTimer-related turnover, or customized mitochondrial events.
• Understand the biological model, treatment condition, sample format, and expected signal dynamics.
• Confirm the preferred detection platform, such as confocal imaging, flow cytometry, fluorescence plate reader, high-content imaging, two-photon imaging, or live-cell time-lapse imaging.
• Define key design requirements, including emission wavelength, signal type, response speed, reversibility, mitochondrial localization, cytotoxicity tolerance, photostability, and assay throughput.
• Identify technical risks, such as pH interference, ROS cross-reactivity, membrane potential dependence, autofluorescence, poor cell permeability, or low signal-to-background ratio.

Based on the project requirements, we develop a tailored probe design strategy that matches the target biology and intended readout.

• Select an appropriate probe format, such as small-molecule fluorescent probe, ratiometric sensor, turn-on probe, NIR probe, enzyme-activatable probe, signal-sustained probe, AIE-based probe, lipid-labeling probe, or genetically encoded reporter.
• Choose a suitable fluorophore scaffold, such as rhodamine, cyanine, hemicyanine, BODIPY, coumarin, fluorescein, naphthalimide, quinolinium, AIEgen, lanthanide complex, or protein-based reporter.
• Design the recognition or response mechanism, such as oxidation, reduction, ion binding, pH response, enzymatic cleavage, aggregation change, FRET, spectral shift, or organelle redistribution.
• Select mitochondrial targeting or retention strategies, including lipophilic cations, triphenylphosphonium groups, pyridinium motifs, peptide-based localization, membrane-retention groups, or mitochondrial-targeting protein sequences.
• Match signal readout to the downstream assay, including intensity-based fluorescence, ratiometric signal, red/green ratio, dual-channel emission, NIR activation, fluorescence lifetime, or image-based morphology readout.

After the initial strategy is defined, we refine the molecular structure to improve probe performance and biological usability.

• Optimize molecular charge, lipophilicity, hydrophilicity, solubility, and intracellular retention.
• Adjust linker length and chemical stability to balance response efficiency and biological compatibility.
• Reduce nonspecific background signal from cytosol, lysosomes, nuclei, plasma membranes, or culture medium.
• Improve photostability, brightness, Stokes shift, quantum yield, and spectral separation.
• Design red, far-red, NIR, or multicolor-compatible probes for multiplex imaging.
• Consider fixed-cell compatibility, long-term live-cell imaging compatibility, or high-content screening compatibility.

Before experimental development begins, we evaluate whether the proposed probe design is chemically feasible and biologically practical.

• Review chemical synthesis feasibility and expected synthetic complexity.
• Evaluate selectivity issues against related analytes, ions, ROS/RNS/RSS species, pH changes, thiols, proteins, or drug autofluorescence.
• Assess whether mitochondrial targeting may depend too strongly on membrane potential.
• Predict possible cytotoxicity, aggregation, poor permeability, nonspecific organelle accumulation, or signal instability.
• Review compatibility with intended controls, imaging settings, co-staining probes, and assay formats.
• Refine the candidate design before proceeding to synthesis or downstream development.

A custom probe design is only useful if it can be properly validated. We provide a validation roadmap to guide the next development stage.

• Recommend photophysical characterization experiments, including absorption/emission spectra, quantum yield, Stokes shift, photostability, pH stability, and spectral separation.
• Design chemical response testing, including target response, kinetics, detection limit, linear range, and selectivity panels.
• Plan biological validation, including cell permeability, mitochondrial localization, co-localization imaging, cytotoxicity testing, and response under biological perturbation.
• Select positive and negative controls, such as mitochondrial uncouplers, ROS inducers, antioxidants, ionophores, metabolic inhibitors, lysosomal modulators, mitophagy inducers, or pathway-specific compounds.

Once the design plan is completed, the project can be transferred into synthesis, characterization, validation, or assay development.

• Probe synthesis and purification planning.
• Photophysical and functional characterization services.
• Mitochondrial localization and biological validation.
• Stable cell line or reporter model development.
• Probe-based high-content screening assay development.
• Mitochondrial functional profiling.
• Multi-parameter assay integration with ROS, ΔΨm, ATP/ADP, NADH/NAD⁺, Ca²⁺, pH, mitophagy, apoptosis, or cell viability readouts.