BD Horizon Real Dyes: Built to Solve Your Flow Cytometry Panel Challenges
Modern flow cytometers are equipped with multiple lasers and advanced detectors, enabling the use of a broad spectrum of fluorescent dyes. However, this has increased the issue of spillover spread, where emission signals “spill” into the primary detectors of other fluorochromes. As instruments have become more sophisticated, the need for fluorescent dyes that can be used together in complex flow panels has grown. BD Horizon™ Real Dyes were designed to meet this need. Driven by next-generation BD dye technology and AI-guided fluorochrome selection for precise spectral positioning, this family of reagents is engineered to reduce spillover and improve resolution, expanding your experiments on both conventional and spectral flow cytometers. Available in four laser-specific colors, BD Horizon RealViolet™, RealBlue™, RealYellow™, and RealRed™ fluorochromes simplify panel design, enhance sensitivity, and increase the number of detectable parameters in a single sample.
A Deep Dive into BD Horizon Real Dye Spillover & Spectral Flow
Spillover spreading is the biggest constraint on high-parameter panel design. When a fluorochrome is excited by multiple lasers, its broad emission profile interferes with neighboring channels, forcing complex compensation adjustments that degrade resolution. PE and PerCP tandems are the most common offenders, excited simultaneously by both blue and yellow-green laser lines.
BD Horizon Real Dyes are engineered to solve this. Each dye is laser-specific, dramatically reducing cross-laser excitation compared to PE and PerCP tandem dyes. As shown in Figure 1, dyes such as PerCP Cy5.5, Bio-Rad StarBright™ Blue 700, and BD Horizon Brilliant™ Blue 700 produce multi peak emission profiles across multiple laser lines, while 705 produces a clean single-peak profile with minimal cross-channel interference.
Optimized for Spectral Flow Cytometry
The laser-specific design makes them particularly powerful on spectral flow cytometers, where unique emission signatures are essential for accurate unmixing. RB780 and RY775 show reduced cross-laser excitation compared to PE-Cy7, enabling superior performance on instruments with blue and yellow-green lasers, such as five-laser BD FACSymphony™ Analyzers and spectral flow cytometers, reducing spectral spread and increasing panel design flexibility (Figure 2).
Performance Across Other Key Attributes
BD Horizon Real Dyes are engineered to perform across all attributes that matter in complex panel design:
Resolution: High stain index values across all four laser lines, with brightness levels matching each dye to the right marker, pairing brighter options with dimly expressed targets to reduce spillover spread across the panel.
Photostability: Consistent MFI and spectral profiles even after extended light exposure, reducing compensation or unmixing errors between reference controls and samples.
Intracellular Staining: Supports surface and intracellular targets including cytokines, transcription factors, cell cycle markers and phosphoproteins, using standard fixation and permeabilization systems.
Buffer Compatibility: Broadly compatible with BD Cytofix™, BD Phosflow™ Perm Buffer III, BD Cytofix/Cytoperm™, BD FACS™ Permeabilizing Solution 2, and other common systems, where PE and PerCP tandems are prone to signal degradation.
Monocyte Background: Engineered to minimize nonspecific monocyte binding, a chronic issue with dyes like PE-Cy7. BD Horizon Real Dyes deliver cleaner staining profiles and fewer false-positive signals in whole blood panels.
BD Support: Panel Design, Samples & Education
For labs still relying on PE or PerCP tandems, BD Horizon Real Dyes offer a direct, data-backed advantage. BD also provides end-to-end support for labs adopting Real Dyes:
- Complimentary panel design consultations
- Sample programs to evaluate BD Horizon Real Dyes in your workflows before committing to a full panel swap
- Onsite or virtual Lunch & Learn sessions on the technology and implementation strategies
Content provided by: BD Horizons
Figure 1: Spectral profile comparisons of RB705, BB700, SBB700 and PerCP-Cy5.5 CD4 clones run on a BD FACSDiscover™ S8 Cell Sort
Figure 2: RB780 and RY775 were used together in an 18-color spectral immunophenotyping panel on the BD FACSDiscover™ S8. The data in Figure 3 shows the resulting gating strategy for the detection of B cells and NK and T-cell subsets, after exclusion of dead cells and doublets.
Figure 3: These advantages extend across all 15 BD Horizon Real Dyes covering the blue, yellow‑green, red, and violet laser lines, giving researchers the flexibility to design high‑parameter panels with minimal spillover on both spectral and conventional flow cytometers.
