Metrohm i-Raman Plus Portable Raman Spectrometer
| Brand | Metrohm |
|---|---|
| Origin | USA |
| Manufacturer | Metrohm |
| Product Type | Portable / Handheld Raman Spectrometer |
| Model | i-Raman Plus |
| Spectral Range | 175–4000 cm⁻¹ |
| Spectral Resolution | 3.0 cm⁻¹ |
| Spatial Resolution | 1 µm (lateral), 1 µm (axial) |
| Low-Wavenumber Cutoff | 65 cm⁻¹ |
| Spectral Reproducibility | <0.5 cm⁻¹ |
Overview
The Metrohm i-Raman Plus is a field-deployable, research-grade portable Raman spectrometer engineered for high-fidelity molecular fingerprinting under diverse operational conditions. Utilizing a stabilized 785 nm diode laser excitation source and a thermoelectrically cooled CCD detector, the system operates on the principle of inelastic light scattering—capturing vibrational mode signatures with minimal fluorescence interference. Its optical architecture incorporates a high-throughput transmission grating and aberration-corrected optics to ensure signal integrity across the full spectral window. Designed for quantitative and qualitative analysis in non-laboratory environments, the i-Raman Plus maintains metrological traceability to NIST-traceable standards and supports rigorous calibration protocols required for regulatory-compliant workflows.
Key Features
- Full-spectrum coverage from 65 cm⁻¹ to 4000 cm⁻¹—enabling detection of low-frequency lattice modes, intermolecular vibrations, and phonon resonances critical in polymorph identification, battery material characterization, and crystallinity assessment.
- Consistent 3.0 cm⁻¹ spectral resolution (FWHM), verified via neon lamp line profiling and maintained across thermal gradients from 10 °C to 40 °C.
- Sub-micron spatial resolution (1 µm lateral and axial) achieved through integrated confocal optical path design and precision XYZ micro-positioning stage compatibility.
- Low-power consumption architecture (4 hours of continuous operation on integrated Li-ion battery, with hot-swappable battery support for extended field deployment.
- Ruggedized magnesium alloy chassis rated IP54 for dust and water resistance, with MIL-STD-810G compliance for shock, vibration, and thermal cycling.
Sample Compatibility & Compliance
The i-Raman Plus accommodates solid, powder, gel, liquid, and thin-film samples without requirement for vacuum or cryogenic cooling. Optional fiber-coupled probes—including contact, non-contact, immersion, and standoff configurations—enable analysis of hazardous, temperature-sensitive, or spatially constrained specimens. The system complies with ISO/IEC 17025:2017 requirements for analytical instrument validation and supports documented instrument qualification (IQ/OQ/PQ) packages. All spectral acquisition and processing workflows adhere to FDA 21 CFR Part 11 principles, including electronic signature enforcement, audit trail logging, and data integrity controls. It is routinely deployed in GLP- and GMP-regulated environments for raw material verification, counterfeit screening, and stability-indicating assay development per USP and ICH Q5E guidelines.
Software & Data Management
SpecSuite software provides a validated, modular platform for spectral acquisition, multivariate analysis (PCA, PLS-DA), library matching (with customizable spectral libraries), and report generation. The software includes built-in ASTM E1840-22 compliant peak-fitting algorithms and baseline correction routines (asymmetric least squares, polynomial fitting). Data files are stored in vendor-neutral HDF5 format with embedded metadata (instrument parameters, environmental conditions, user annotations). Export options include CSV, JCAMP-DX, and mzML-compatible formats for integration into LIMS and ELN systems. Remote instrument control and real-time spectral streaming are supported via Ethernet and Wi-Fi (WPA3-secured), with optional TLS 1.3 encryption for cloud-based data synchronization.
Applications
- Pharmaceutical: Polymorph screening, API-excipient compatibility studies, counterfeit drug detection, and in-process monitoring of lyophilization cycles.
- Materials Science: Carbon nanotube chirality assignment, graphene layer counting, stress/strain mapping in composites, and phase transition kinetics in shape-memory alloys.
- Cultural Heritage: Non-invasive pigment identification on frescoes, parchment degradation analysis, and corrosion product characterization on archaeological metals.
- Geosciences: In situ mineral identification in drill cores, fluid inclusion analysis, and metamorphic grade assessment via quartz Raman shift calibration.
- Forensics: Trace evidence analysis of explosives residues, illicit drug crystallinity profiling, and ink differentiation in questioned document examination.
FAQ
Is the i-Raman Plus suitable for quantitative analysis?
Yes—when paired with internal standard calibration or multivariate regression models validated per ICH Q2(R2), it delivers repeatability (RSD <2% for peak intensity) and intermediate precision acceptable for QC release testing.
Can it be used for in vivo or biological tissue analysis?
It supports ex vivo tissue section analysis with appropriate fiber probe configuration; however, in vivo application requires IRB approval and laser safety classification review (Class 3B per IEC 60825-1).
Does Metrohm provide method transfer support between i-Raman Plus and benchtop Raman systems?
Yes—Metrohm offers cross-platform spectral alignment tools and SOP templates aligned with ASTM E2593-21 for seamless method portability across i-Raman, Mira, and benchtop LabRAM platforms.
What maintenance is required for long-term spectral stability?
Annual wavelength calibration using certified polystyrene and silicon standards is recommended; detector dark current drift is automatically compensated during each acquisition via real-time offset correction.
