Lengguang Tech. F98 Molecular Fluorescence Spectrometer
| Brand | Lengguang Tech. |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Category | Domestic |
| Model | F98 |
| Price Range | USD 14,000–28,000 |
| Dispersive Element | Dual Grating Monochromator |
| Instrument Type | Steady-State Fluorescence Spectrometer |
| Slit Width (Spectral Bandpass) | 1.0–20.0 nm |
| Spectral Resolution | 1.0 nm |
| Sensitivity | >350:1 (peak-to-peak) |
| Wavelength Accuracy | ±0.4 nm |
| Excitation Source | 150 W Ozone-Free Xenon Lamp (Hamamatsu, Japan) |
| Emission Detection Range | 200–900 nm |
| Excitation Range | 200–900 nm |
| Minimum Sample Volume | 0.5 mL (standard 10 mm cuvette) |
| Optical System | Dual-Beam Ratio-Monitoring with Horizontal Beam Geometry |
| Linearity | R² ≥ 0.995 |
Overview
The Lengguang Tech. F98 Molecular Fluorescence Spectrometer is a high-performance, steady-state fluorescence instrument engineered for precision molecular luminescence analysis across research and quality control laboratories. Based on dual-grating monochromator architecture and a horizontal-beam optical path design, the F98 delivers high spectral fidelity, exceptional signal stability, and broad spectral coverage from 200 nm to 900 nm in both excitation and emission modes. Its core measurement principle relies on photoluminescence detection: a stabilized 150 W ozone-free xenon lamp (original Hamamatsu unit) provides intense, continuous UV–Vis–NIR excitation; emitted photons are isolated by high-throughput gratings and quantified using a red-sensitive photomultiplier tube (PMT, Hamamatsu R928), enabling high dynamic range (>6 orders of magnitude) and low-noise detection. Designed as an outcome of Shanghai Science and Technology Commission’s R&D initiative for advanced fluorescence instrumentation, the F98 meets fundamental requirements for quantitative fluorometry—including compliance with ASTM E1317 (Standard Test Method for Determining Fluorescence Quantum Yield) and ISO 17025-aligned operation—making it suitable for method validation under GLP or regulated QC environments.
Key Features
- Dual-grating monochromator with automatic wavelength scanning and real-time dual-beam excitation ratio monitoring ensures long-term photometric stability and minimizes drift-induced artifacts.
- Horizontal beam geometry reduces sample volume requirement to just 0.5 mL using standard 10 mm quartz cuvettes—ideal for precious or limited biological, pharmaceutical, or environmental samples.
- Programmable built-in optical shutter enables time-resolved gating for photolabile compounds, improving reproducibility in kinetic or low-signal measurements.
- Advanced spectral correction algorithm compensates for instrument-specific spectral response, delivering true-sample fluorescence spectra rather than instrument-weighted profiles.
- Integrated spectral calibration routine supports wavelength verification against NIST-traceable standards (e.g., holmium oxide or didymium filters), ensuring traceability per ISO/IEC 17025 Clause 6.5.2.
- Optimized thermal management and rigid optical bench design minimize mechanical drift, supporting extended acquisition protocols such as 3D fluorescence mapping and synchronous scanning over multi-hour sessions.
Sample Compatibility & Compliance
The F98 accommodates diverse sample formats via a modular accessory ecosystem: standard 10 mm cuvettes, 200 µL microcentrifuge tube holders, semi-automated sample changers, membrane and powder sample stages, and custom-fit cuvette adapters. Its wide 200–900 nm spectral window supports analysis of aromatic organics, lanthanide complexes, quantum dots, proteins (tryptophan/tyrosine), nucleic acids, and food-borne fluorophores (e.g., aflatoxins, polycyclic aromatic hydrocarbons). The system complies with key regulatory expectations for analytical instrumentation: data integrity features include audit-trail-enabled software (optional 21 CFR Part 11 compliance package), electronic signature support, and raw-data export in vendor-neutral formats (CSV, ASCII). All critical components—including the Hamamatsu xenon lamp and PMT—are serialized and documented to support equipment qualification (IQ/OQ/PQ) and GMP traceability.
Software & Data Management
The F98 is operated via Lengguang’s proprietary FluoroScan™ software, a Windows-based platform supporting method-driven workflows, automated calibration routines, and batch processing. It natively supports advanced scan modes: 3D excitation-emission matrix (EEM), time-resolved EEM, constant-wavelength difference (Δλ = const), and constant-wavenumber difference (Δcm⁻¹ = const) synchronous scans—enabling resolution enhancement for overlapping fluorophores. Data files include full metadata (instrument parameters, date/time stamp, operator ID, calibration status), and raw intensity values are stored without lossy compression. Export options include CSV, JCAMP-DX, and XML-compliant formats compatible with third-party chemometric tools (e.g., MATLAB, Unscrambler, Pirouette). Optional software modules provide peak deconvolution, spectral unmixing, and integration with LIMS via HL7 or REST API interfaces.
Applications
The F98 serves as a primary tool in multiple regulated and research-intensive domains. In pharmaceutical development, it supports impurity profiling, excipient compatibility studies, and stability-indicating assays per ICH Q2(R2). In environmental labs, it quantifies polycyclic aromatic hydrocarbons (PAHs) in water per EPA Method 446.1 and detects dissolved organic matter (DOM) fluorescence signatures for wastewater characterization. Clinical and biochemical applications include enzyme activity assays (e.g., NADH/FAD autofluorescence), protein conformational analysis, and rapid screening of vitamin B2 or folic acid in fortified foods. Materials science users leverage its high-resolution capability for characterizing emissive nanomaterials, OLED precursors, and perovskite quantum dots—particularly where precise Stokes shift determination and quantum yield estimation are required.
FAQ
What is the typical warm-up time required before achieving photometric stability?
The 150 W Hamamatsu xenon lamp requires approximately 20 minutes of stabilization at full power to reach thermal equilibrium; software-initiated auto-alignment and baseline correction routines complete within this period.
Can the F98 perform time-resolved fluorescence measurements?
No—the F98 is optimized for steady-state detection only. For lifetime measurements, a pulsed excitation source and TCSPC module would be required, which are not integrated into this platform.
Is NIST-traceable wavelength calibration supported out-of-the-box?
Yes—built-in calibration routines accept certified reference standards (e.g., Holmium Oxide filter SRM 2034); calibration reports include uncertainty budgets aligned with ISO/IEC Guide 98-3 (GUM).
Does the software support automated pass/fail criteria for release testing?
Yes—user-defined acceptance thresholds can be applied to peak intensity, λmax, spectral shape similarity (correlation coefficient), and signal-to-noise ratio, generating compliant test reports with digital signatures.
What maintenance intervals are recommended for the xenon lamp and PMT?
The Hamamatsu lamp has a rated lifetime of ≥2,000 hours; PMT gain stability is verified during annual performance qualification—no routine replacement is specified unless sensitivity drops below 350:1 (p-p) during system suitability checks.
