In modern molecular biology and clinical diagnostics, fluorescently labeled oligonucleotide probes constitute a crucial component of nucleic acid detection methods. While “native” dyes (e.g., those from the fluorescein or rhodamine families) have been historically established in standard protocols, recent advances in chemical synthesis provide a broad spectrum of alternative fluorophores that offer equivalent, and in some instances superior, analytical validity.
The primary motivation for transitioning to alternative fluorophores is the optimization and assurance of continuity in research and diagnostics.
Exceptional Brightness: high extinction coefficients and quantum yields guarantee a powerful, unmistakable fluorescent signal.
Superior Photostability: they strongly resist photobleaching, keeping your data reliable even during prolonged exposure.
Environmental Resilience: fluorescent performance remains rock-solid despite fluctuations in pH, ionic strength, or local microenvironments.
Proven Thermostability: built specifically to withstand the rigorous temperature cycles of PCR and other high-heat assays.
Seamless Compatibility: true plug-and-play replacement for native dyes—no need to re-optimize your established protocols.
Cost-Effectiveness: a highly favorable price-to-performance ratio that delivers maximum value without compromising on analytical quality.
When replacing a fluorophore within an established system, several physicochemical parameters that directly impact the limit of detection (LOD) and assay robustness must be evaluated:
Extinction coefficient and quantum yield: parameters dictating the intensity of the fluorescent signal. Alternative dyes must exhibit at least equivalent brightness to maintain the sensitivity of the assay.
Photostability: resistance to photobleaching during repeated excitation cycles, which is particularly critical for methods such as FISH (fluorescence in situ hybridization) and high-throughput sequencing.
Solvatochromism and microenvironmental effects: the ability of the dye to maintain stable fluorescent properties under variable pH conditions and buffer ionic strengths.
Thermostability: a crucial factor during PCR cycling, where the dye must not undergo thermal degradation.
A comparison of the key optical parameters between selected alternative dyes and their traditional analogs is presented in Table 1.
The application of these fluorophores is fully validated across a broad spectrum of techniques:
Quantitative PCR (qPCR): including multiplex assays, which impose stringent requirements for minimal spectral overlap (crosstalk).
Fluorescence in situ hybridization (FISH): the localization of specific sequences in cytogenetics.
Genotyping (SNP analysis): allele discrimination utilizing probes with a high signal-to-noise ratio.
The implementation of alternative dyes represents a rational step toward optimizing laboratory workflows. Prior to their implementation, we recommend performing a technical validation of the optical parameters to ensure compatibility with the specific detection platform.
Typical examples of successful substitution are the modern ATTO series fluorophores, specifically ATTO 550 and ATTO 465. These dyes, with emission maxima in the yellow-orange and blue-green regions of the spectrum, exhibit exceptional spectral properties and stability, making them the optimal choice for applications requiring high precision and an excellent signal-to-noise ratio. Among the most frequently requested alternatives that we currently routinely synthesize for our customers are ATTO 550, ATTO 465, and ATTO 647N.
Through our long-standing collaboration with ATTO-TEC GmbH (a Leica Microsystems company), our capabilities in the synthesis of ATTO series dyes are highly extensive and versatile. Our team provides comprehensive technical support in selecting the optimal modification for your specific applications, and we will gladly find a solution tailored to your exact requirements.
Zuzana Havlínová
Lucie Nožková
Leona Hofmeisterová
Probe Cy5.5-BHQ2 Cy5.5-BHQ2 is a real-time PCR probe with Cy5.5 fluorophore and BHQ2 quencher. The probe is most commonly used as a Taqman-type hydrolysis probe, providing highly sensitive and specific detection of target DNA.
Probe Cy5-BBQ650 Cy5-BBQ650 is a real-time PCR dual-labeled probe with Cy5 fluorophore and BBQ650 dark quencher. It can be used as an alternative to BHQ2 quencher due to its broader absorption spectrum and higher stability. The probe is most commonly used as a Taqman-type hydrolysis probe providing highly sensitive and specific detection of target DNA.
HEX Hexachlorofluorescein is commonly used in multiplex reactions together with FAM and TET. Hexachlorofluorescein may be attached to the 5' end of the oligonucleotide.
Fluorescein It is a mixture of 5- and 6-carboxyfluorescein isomers. Fluorescein may be attached anywhere within the oligonucleotide sequence.
Standard oligonucleotides reliably cover routine laboratory needs. However, more complex experimental designs—such as the preparation of long control templates, specific probes, or advanced genetic manipulations—often require sequences exceeding one hundred bases. To address these specific research applications, GENERI BIOTECH has expanded its portfolio with a new offering: ultramers. Standard Synthesis Parameters Ultramers are a targeted
Your request has been sent.
Thank you for your interest in our testing services. We will reply to your e-mail address as soon as possible.
Thank you for your inquiry
Thank you for your inquiry
Your registration has been sent.
Thank you for your inquiry
ENG 
CZE