Azure Biosystems Cielo 6/3 Real-Time Fluorescent Quantitative PCR System
| Brand | Azure Biosystems |
|---|---|
| Origin | USA |
| Model | Cielo 6 / Cielo 3 |
| Instrument Type | Real-Time Fluorescent Quantitative PCR System |
| Sample Throughput | 96-well format |
| Max Heating Rate | 6°C/s |
| Temperature Accuracy | ±0.1°C |
| Well-to-Well Temperature Uniformity | ±0.2°C |
| Excitation Source | High-Power LED (450–730 nm for Cielo 6 |
| Detection Channels | 6 (Cielo 6) / 3 (Cielo 3) |
| Multiplexing Capacity | Up to 6 targets (Cielo 6) / up to 3 targets (Cielo 3) |
| Reaction Volume | 1–150 µL (10–65 µL recommended) |
| Dynamic Range | 10 logs |
| Onboard Memory | 32 GB (~20,000 experiments) |
| Connectivity | USB, Wi-Fi, Ethernet |
| Footprint | 30.5 × 50.8 × 43.2 cm (W × D × H) |
Overview
The Azure Biosystems Cielo 6 and Cielo 3 are high-performance real-time fluorescent quantitative PCR systems engineered for precision, reproducibility, and workflow efficiency in molecular biology laboratories. Based on solid-state LED excitation and high-sensitivity spectral detection, the Cielo platform employs full-well scanning technology—capturing approximately 100,000 data points per well—to eliminate spatial sampling bias inherent in single-pixel or limited-point detection architectures. This optical architecture enables robust quantification across a 10-log dynamic range without requirement for passive reference dyes such as ROX, thereby simplifying assay setup and reducing inter-run variability. Thermal control is delivered via a Peltier-based thermal module with ±0.1°C accuracy and ±0.2°C well-to-well uniformity, ensuring stringent compliance with ISO 13485 and CLIA-aligned thermal validation protocols. The system supports both SYBR Green I–based intercalating assays and multiplexed probe-based chemistries—including hydrolysis (TaqMan), molecular beacon, and scorpion primers—across six independently optimized optical channels (Cielo 6) or three channels (Cielo 3), making it suitable for gene expression profiling, pathogen detection, genotyping, and NGS library quantification.
Key Features
- Full-well fluorescence scanning: ~100,000 pixel-level measurements per well, enabling statistically robust baseline determination and Cq calculation without reliance on single-point or averaged ROI sampling.
- No-ROX operation: Validated performance with ROX-free SYBR Green and probe chemistries, eliminating dye normalization artifacts and reducing reagent cost and complexity.
- High-fidelity thermal cycling: 6°C/s maximum block ramp rate, ±0.1°C absolute temperature accuracy, and ±0.2°C well-to-well uniformity—validated per ASTM E2593-22 guidelines for qPCR instrument qualification.
- Multi-channel spectral flexibility: Cielo 6 offers six independently tunable excitation/emission bands (e.g., 475/524 nm for FAM/SYBR; 623/676 nm for Cy5; 655/711 nm for Cy5.5), supporting custom dye development and legacy chemistry compatibility.
- Automated post-run notification: Integrated Wi-Fi connectivity enables email alerts upon run completion, including automatic attachment of Cq tables, amplification plots, and melt curve exports—fully compliant with GLP audit trail requirements when paired with Cielo Manager v4.2+.
- Onboard 32 GB storage: Equivalent to >20,000 completed runs, with encrypted metadata indexing for rapid retrieval and version-controlled experiment archiving.
Sample Compatibility & Compliance
The Cielo system accepts standard 96-well plates (full-skirt, semi-skirt, or non-skirt), 8- and 12-well strips, and individual 0.2 mL tubes—compatible with all major qPCR consumables from Bio-Rad, Thermo Fisher, Qiagen, and Eppendorf. Reaction volumes span 1–150 µL, with optimal sensitivity demonstrated between 10–65 µL. All optical and thermal specifications meet or exceed requirements outlined in ISO/IEC 17025:2017 for testing laboratory competence and USP for nucleic acid quantification validation. The system supports 21 CFR Part 11–compliant electronic signatures and audit trails when used with Cielo Manager’s secure user role management (Admin, Technician, Viewer). Calibration certificates traceable to NIST standards are provided with each instrument shipment.
Software & Data Management
Cielo Manager software (v4.2+) provides a validated, standalone desktop application for experimental design, real-time monitoring, and analytical reporting. It features color-coded well layout assignment (by sample type, biological replicate, or technical replicate), customizable threshold setting, multi-target amplification trajectory overlay, and 2D heat map visualization for rapid outlier identification. Export formats include CSV, PDF, and MIQE-compliant XML. Raw fluorescence data (.cfx files) are stored with embedded instrument metadata (lamp hours, thermal cycle logs, optical gain settings), enabling retrospective reanalysis without loss of provenance. Software updates follow a documented change control process aligned with GAMP 5 Category 3 classification.
Applications
- Relative and absolute quantification of mRNA transcripts in gene expression studies (e.g., ACTB, GAPDH, TBP, SDHA, RRP36, B2M), with PCR efficiencies consistently >94% and R² ≥ 0.99 across 7–8 point 10-fold dilution series.
- Multiplexed detection of viral and bacterial targets in clinical diagnostics, including SARS-CoV-2, influenza A/B, and MRSA, using dual-labeled probes with minimal spectral crosstalk.
- NGS library quantification prior to sequencing, demonstrating CV < 0.3% for Cq values across 96 replicates (mean Cq = 19.5, SD = 0.03).
- SNP genotyping via allele-specific hydrolysis probes and high-resolution melt (HRM) analysis, leveraging the system’s precise temperature ramping and continuous fluorescence acquisition during dissociation.
- Environmental microbiology applications requiring low-abundance target detection, enabled by near-infrared channel optimization (Cy5.5, Quasar 705) and ultra-low background signal processing.
FAQ
Does the Cielo system require ROX normalization for SYBR Green assays?
No. Full-well scanning and advanced background subtraction algorithms eliminate the need for passive reference dyes. Validation data confirm consistent Cq values across plate positions without ROX correction.
Can I import custom dye spectra into Cielo Manager?
Yes. The software supports user-defined excitation/emission profiles and cross-talk compensation matrices for novel fluorophores or proprietary probe chemistries.
Is the onboard memory sufficient for long-term archival?
The 32 GB flash storage retains raw data and metadata for ~20,000 runs. For enterprise-scale deployment, optional network-attached storage (NAS) integration is supported via SMB protocol.
How is thermal uniformity verified during installation qualification (IQ)?
A 96-well glycerol-based thermal mapping kit is included, enabling measurement of actual well temperatures at multiple setpoints (4°C, 50°C, 72°C, 95°C) per ASTM E2593-22 Annex A2.
What regulatory documentation is supplied with the instrument?
Each unit ships with a Factory Acceptance Test (FAT) report, NIST-traceable calibration certificate, CE/UKCA marking documentation, and a full set of IQ/OQ protocols compliant with ISO 13485 and FDA 21 CFR Part 820.
