BioTools ChiralRAMAN-2X Microscopic Confocal Chiral Raman Spectrometer

Overview

The BioTools ChiralRAMAN-2X is a purpose-engineered microscopic confocal chiral Raman spectrometer designed for direct, label-free determination of absolute configuration and conformational states of chiral biomolecules in native or near-native environments. Unlike conventional Raman systems, the ChiralRAMAN-2X integrates dual circular polarization (DCP) and single circular polarization (SCP) optical pathways—enabling quantitative measurement of chiral Raman optical activity (ROA) signals with high signal-to-noise ratio and minimal instrumental artifacts. Its confocal architecture ensures diffraction-limited spatial resolution (1×1 µm), while the high-throughput optical design supports rapid spectral acquisition (as fast as 150 ms per spectrum) without compromising spectral fidelity. The system is optimized for aqueous-phase measurements, accommodating temperature-controlled sample environments to preserve structural integrity of proteins, nucleic acids, glycans, and viral capsids during acquisition.

Key Features

• Configurable polarization optics: factory-aligned SCP mode for rapid screening; optional DCP mode for rigorous ROA quantification and artifact suppression
• Integrated Olympus microscope platform (BX71 or BX81), enabling precise micro-region targeting and morphological correlation
• High-stability laser excitation at 532 nm (optional 785 nm for fluorescence-suppressed operation), coupled with notch-filter-based background rejection
• Thermally regulated sample stage with ±0.1 °C stability, compatible with aqueous buffers and cryogenic accessories
• Automated spectral calibration using internal Ne/Ar reference lines, ensuring long-term wavenumber accuracy (<±0.05 cm⁻¹ drift over 8 h)
• Robust mechanical design with active vibration damping and air purge-compatible optical housing for cleanroom and GLP-compliant labs

Sample Compatibility & Compliance

The ChiralRAMAN-2X accommodates solid, lyophilized, gel-phase, and solution-phase samples—including sub-milligram quantities of peptides, oligonucleotides, glycoconjugates, and intact virions. No crystallization or enantiomeric separation is required: absolute configuration is determined directly from ROA band patterns in the 100–2000 cm⁻¹ fingerprint region. The instrument meets ISO/IEC 17025 requirements for analytical instrument qualification and supports audit-ready documentation per FDA 21 CFR Part 11 when used with validated software modules. All optical components comply with IEC 61000-6-3 (EMC) and IEC 60825-1 (laser safety Class 1 enclosure).

Software & Data Management

Control and analysis are performed via ChiralSpec v4.2—a modular, GxP-ready application suite supporting method-driven workflows, automated baseline correction, vector subtraction (L–R polarization difference), and principal component analysis (PCA) of ROA datasets. Raw data are stored in HDF5 format with embedded metadata (instrument parameters, environmental logs, user annotations). The software includes built-in validation protocols for IQ/OQ/PQ documentation and generates electronic records compliant with ALCOA+ principles. Optional integration with LIMS (e.g., LabVantage, Thermo SampleManager) enables traceable sample lifecycle tracking across QC and R&D operations.

Applications

• Determination of absolute stereochemistry in synthetic chiral pharmaceuticals without derivatization or chiral chromatography
• Monitoring conformational transitions in therapeutic monoclonal antibodies under thermal or pH stress
• Characterizing secondary and tertiary structure of intrinsically disordered proteins in physiological buffer
• Quantifying enantiomeric excess (ee) in asymmetric catalysis reaction mixtures in real time
• Probing ligand-induced folding/unfolding of RNA aptamers and DNA G-quadruplexes
• Validating higher-order structure (HOS) consistency across biosimilar manufacturing batches per ICH Q5C guidelines

FAQ

What sample volume or mass is required for reliable chiral Raman measurement?
Typical requirements range from 10–100 µg for lyophilized biomolecules and 10–50 µL of 0.1–1.0 mM aqueous solutions. Minimal sample consumption is enabled by the confocal geometry and high quantum efficiency detector.
Can the ChiralRAMAN-2X operate under ambient humidity or does it require dry-air purging?
The optical bench is sealed and purge-capable; standard operation in ambient lab air is supported, but ¹⁶O/¹⁸O isotope studies or low-wavenumber (<200 cm⁻¹) work benefit from N₂ purge to suppress atmospheric H₂O/CO₂ absorption bands.
Is spectral calibration traceable to NIST standards?
Yes—wavenumber calibration uses primary Ne/Ar emission lines (NIST SRM 2541), and intensity linearity is verified annually using calibrated photodiode arrays traceable to NIST SRM 2034.
Does the system support time-resolved chiral Raman measurements?
With external trigger input and synchronized laser gating, kinetic ROA experiments down to 50-ms temporal resolution are achievable using custom pulse sequences.
How is data integrity ensured during multi-user laboratory deployment?
Role-based access control, electronic signatures, full audit trail logging, and encrypted HDF5 storage meet FDA 21 CFR Part 11 and EU Annex 11 requirements for regulated environments.