Our Custom Amplifluor Probe Synthesis service provides research teams, biotechnology companies, assay developers, agricultural genomics groups, and high-throughput screening laboratories with application-ready fluorescent hairpin primers for PCR-based detection. Often described as Amplifluor probes or UniPrimer-style detection primers, these oligonucleotides combine a stem-loop structure, a reporter fluorophore, a quencher, and a 3' priming region. Fluorescence remains suppressed while the hairpin is closed and increases after primer incorporation separates the reporter from the quencher.
We support the complete oligonucleotide workflow, including assay architecture review, universal-tail planning, hairpin sequence design, reporter–quencher selection, custom synthesis, purification, analytical verification, and target-specific primer coordination. Projects can be configured for real-time PCR, endpoint fluorescence measurement, biallelic SNP genotyping, gene expression research, and other closed-tube amplification studies. Our goal is to deliver not only a synthesized probe, but a technically coherent oligonucleotide set that fits the target sequence, PCR design, detection channels, and planned experimental workflow.
Figure.1 The sturcture of Amplifluor probes.
Hairpin Stability and Background Signal: The stem must hold the reporter and quencher close enough to suppress fluorescence before amplification, while still opening efficiently during primer extension. We review stem length, base pairing, loop architecture, terminal modifications, and expected cycling conditions to balance low background with responsive signal generation.
Universal-Tail Compatibility: Amplifluor assays depend on coordinated interaction between the fluorescent hairpin primer and a complementary universal sequence introduced through a target-specific primer. Poorly matched tails can reduce primer recruitment, create unintended secondary structures, or increase primer-dimer formation. We assess tail complementarity, orientation, junction placement, and cross-reactivity across the complete oligonucleotide set.
Allele Discrimination: SNP genotyping requires two allele-specific primers to compete under the same reaction conditions without producing ambiguous signals. We support 3' allele placement, optional destabilizing mismatch review, primer-length balancing, common-primer selection, and dye-channel assignment to improve separation among homozygous, heterozygous, and no-template clusters.
Reporter and Instrument Fit: A suitable fluorophore must match the excitation and emission channels of the selected qPCR instrument or plate reader. Reporter brightness alone is not sufficient; spectral overlap, quencher range, multiplex configuration, optical calibration, and signal normalization must also be considered. We align dye–quencher selection with the intended hardware and assay format.
Synthesis and Purification Complexity: Dual-modified hairpin oligonucleotides can contain hydrophobic dyes, quenchers, linkers, and secondary structures that complicate purification and recovery. We select synthesis, purification, and analytical methods according to sequence length, modification placement, scale, and application so that identity and purity are evaluated before experimental use.
Our service is designed for projects that require coordinated development of the fluorescent hairpin primer, universal-tagged target primers, and related control oligonucleotides. Support can begin with an existing sequence specification or with a target region that requires complete assay-oriented design.
Each project is reviewed for hairpin behavior, primer compatibility, reporter–quencher performance, amplification strategy, purification requirements, and analytical expectations. Relevant projects can also be integrated with our broader diagnostic probe and oligonucleotide services.
Amplifluor is one of several fluorescence-based PCR detection formats. The appropriate chemistry depends on whether the project prioritizes a reusable universal reporter, target-specific hybridization, allele discrimination, multiplexing, or simple amplification monitoring.
| Detection Chemistry | Signal Generation | Target-Specific Components | Useful Project Features | Main Design Considerations |
| Amplifluor Hairpin Primer | Primer incorporation opens an energy-transfer-labeled hairpin and separates reporter from quencher | Universal-tagged target primer or allele-specific primers plus a common primer | Reusable universal reporter architecture, closed-tube detection, real-time or endpoint measurement, SNP genotyping | Hairpin stability, universal-tail compatibility, primer ratios, dye channels, non-specific extension |
| TaqMan Hydrolysis Probe | Polymerase-mediated probe cleavage separates reporter and quencher during amplification | Two primers and one target-specific dual-labeled probe per target | Direct sequence-specific detection, established qPCR workflows, flexible multiplex assay design | Probe binding site, probe melting behavior, reporter selection, cleavage efficiency, target variation |
| Molecular Beacon | Target hybridization opens a fluorescent hairpin without primer incorporation | Two amplification primers and one target-specific beacon | Hybridization-based specificity, mismatch-sensitive detection, fluorescence without probe hydrolysis | Stem–target competition, beacon melting profile, binding kinetics, target accessibility |
| Scorpion Primer | A primer-linked probe hybridizes intramolecularly to its extension product and opens the reporter–quencher structure | Probe and primer are incorporated into one multifunctional oligonucleotide | Rapid intramolecular signaling and compact primer–probe architecture | Linker and blocker placement, hairpin design, primer extension, synthesis complexity |
| DNA-Binding Dye | Fluorescence increases when dye binds double-stranded amplification products | Two target-specific primers | Simple assay setup, early primer screening, melt-curve analysis | Signal from primer-dimers or non-specific amplicons, limited target distinction in multiplex reactions |
The configuration below summarizes the main elements reviewed when translating an assay concept into a synthesizable Amplifluor probe and compatible primer set. Final specifications depend on the target sequence, detection instrument, experimental format, and requested deliverables.
| Design Element | Planning Options | Critical Review Points | Typical Deliverable | Decision Value |
| Hairpin Stem | Custom stem length and composition based on reporter–quencher proximity and cycling conditions | Stem stability, unintended structures, opening behavior, extension compatibility | Reviewed stem-loop sequence | Helps control background fluorescence and signal activation |
| Universal Tail | Existing customer sequence, established universal sequence, or project-specific tail | Complementarity, orientation, primer junction, cross-reactivity, multiplex interactions | Matched probe and target-primer sequences | Ensures recruitment of the fluorescent primer into the intended amplicon |
| Reporter Dye | Fluorescein/FAM-range, green-yellow channels, orange-red channels, or other compatible reporters | Instrument optics, spectral overlap, multiplex plan, light sensitivity | Reporter recommendation and labeled oligonucleotide | Aligns probe output with available detection channels |
| Quencher | Dark or other compatible quencher selected for the reporter emission range | Spectral coverage, attachment position, hairpin proximity, synthesis compatibility | Reporter–quencher pair specification | Reduces closed-state fluorescence and supports signal-to-background separation |
| Target Primer Set | Standard qPCR pair, two allele-specific primers plus common primer, or custom panel configuration | Specificity, melting behavior, 3' discrimination, amplicon context, primer-dimer risk | Synthesis-ready primer sequences | Connects probe chemistry to target-selective amplification |
| Purification | Chromatographic or electrophoretic purification selected for construct complexity | Dye hydrophobicity, truncated sequences, modification-related impurities, recovery | Purified probe or complete oligonucleotide set | Removes synthesis-related species that may affect fluorescence or amplification |
| Analytical Verification | Purity analysis, identity confirmation, quantity or concentration assessment | Construct size, modification chemistry, analytical method suitability | Agreed analytical data package | Confirms that the delivered material matches the planned molecular specification |
| Delivery Format | Individual tubes, normalized aliquots, paired probe sets, or plate organization | Light protection, freeze–thaw exposure, concentration accuracy, laboratory workflow | Ready-to-reconstitute or prepared oligonucleotide format | Simplifies assay setup and reduces handling differences across samples or targets |
Our workflow connects sequence design with practical oligonucleotide manufacturing and assay-use requirements. Each stage is reviewed in the context of the complete detection system rather than treating the fluorescent hairpin as an isolated modification project.
We collect the target sequence, assay purpose, SNP or variant position where applicable, planned instrument, detection channels, sample format, desired scale, and available primer information. This establishes whether the project needs one universal probe, paired allele reporters, a complete primer set, or redesign of an existing assay.
The target region, universal-tail logic, primer orientation, hairpin structure, reporter–quencher configuration, and oligonucleotide interactions are reviewed. Potential risks such as secondary structure, primer-dimer formation, weak allele discrimination, or unsuitable optical channels are identified before synthesis.
We provide the proposed probe and primer configuration for technical confirmation. The review can include sequence annotations, modification positions, purification targets, analytical methods, and delivery format so that the synthesized material matches the planned experimental workflow.
The oligonucleotide is assembled with the specified fluorophore, quencher, linkers, and terminal groups. Purification is selected according to construct length and modification complexity to separate full-length material from truncated sequences, unconjugated components, and closely related synthesis impurities.
Agreed purity, identity, and quantity assessments are completed using suitable analytical methods. The resulting information is reviewed against the project specification before the probe or oligonucleotide set is prepared for delivery.
Materials are supplied with sequence, modification, handling, and analytical information as agreed. Post-delivery support can address reconstitution, primer ratios, signal background, channel assignment, assay transfer, or sequence revisions identified during initial testing.
A functional Amplifluor assay depends on the interaction of hairpin thermodynamics, fluorescent labeling, primer extension, target specificity, and instrument detection. Our service combines these factors within one coordinated development workflow.
Amplifluor hairpin primers are useful when a project requires sequence-linked fluorescence, closed-tube PCR monitoring, or reuse of a universal reporter architecture across multiple target-specific primer sets. The final assay format should be selected according to target biology, required discrimination, throughput, and available detection hardware.
Whether you need a fluorescent hairpin primer, paired reporters for SNP genotyping, universal-tagged PCR primers, or a complete Amplifluor-format oligonucleotide panel, our team can help define a synthesis-ready configuration aligned with your target and detection platform. Share your target sequence, variant position, preferred fluorescence channels, instrument model, required scale, and existing primer information so that we can assess design feasibility, modification options, purification needs, and analytical deliverables. Contact us to discuss your Custom Amplifluor Probe Synthesis project.
We employ proprietary bioinformatics algorithms to design the Z-sequence and primer binding regions, ensuring specific binding to the target DNA sequence while avoiding non-specific amplification.
We offer various validated dye-quencher pairs including FAM-BHQ1, HEX-BHQ1, and Cy3-BHQ2, and can recommend optimal combinations based on your instrument configuration.
All Amplifluor probes undergo HPLC purification to remove incomplete synthesis products, with additional mass spectrometry verification for molecular weight confirmation.
Yes. We specialize in designing probe combinations compatible with different fluorescence channels, supporting simultaneous detection of 2-4 targets in a single reaction, with spectral crossover validation.
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