STRam Raman spectrometer for analyses through non-transparent packaging

Significance of the Topic

Raman analysis through non-transparent packaging addresses critical needs in quality control, authentication and process monitoring across pharmaceuticals, chemicals, food and security checkpoints.

Objectives and Overview

The STRam system by Metrohm/B&WTek combines a lab-grade fiber-optic probe, software tools, and accessories to enable rapid, non-destructive Raman measurements through opaque containers. The standard kit includes real-time spectral acquisition software (BWSpec), material identification software (BWID Pharma), safety gear and calibration standards.

Methodology and Instrumentation

Experimental configuration centers on the STRam Raman probe with a 785 nm excitation fiber (105 µm, NA 0.22) and Raman pickup fiber (300 µm, NA 0.22), adhesive-sealed quartz window, and up to 150 cm fiber length. A handheld i-Raman Pro/Prime spectrometer interfaces via FC/PC connectors. Key software components facilitate automated dark subtraction, baseline correction and chemometric evaluation in compliance with FDA 21 CFR Part 11.

Main Results and Discussion

While empirical performance depends on sample matrix and packaging material, the STRam probe reliably detects characteristic Raman peaks down to 150 cm-1, enabling qualitative identification through glass, plastic and foil. The integrated calibration cap ensures reproducible wavenumber accuracy. Combined with BWID libraries, the system achieves rapid match-and-id workflows for diverse compound classes.

Benefits and Practical Application

• Non-destructive through-container testing for sealed pharmaceuticals.
• High-throughput screening in production lines with optional flow cells.
• Regulatory compliance via secure electronic records and audit trails.
• Modular expandability through immersion shafts, microscope sampling heads and extensive spectral libraries covering polymers, drugs, hazardous chemicals and more.

Future Trends and Potential Applications

Ongoing trends include miniaturization of Raman hardware, integration with AI-driven spectral interpretation, in-line process analytics for continuous manufacturing, and expanded chemometric models for ultra-complex matrices. Emerging probe designs will support higher temperature/pressure environments and deeper sampling depths.

Conclusion

The STRam Raman spectrometer accessory kit provides a versatile, turnkey solution for non-invasive material identification through opaque barriers. Its combination of robust fiber-optic probe design, comprehensive software suite and modular accessories makes it a powerful tool for quality control, security screening and process monitoring across multiple industries.