Optimized analysis for oils, liquids, syrups and pastes

Significance of the topic

Rapid, reliable characterization of viscous and liquid materials — oils, syrups, pastes and other complex liquids — is critical across food, petrochemical, biodiesel and manufacturing quality control. Fourier-transform infrared (FTIR) spectroscopy with an integrated attenuated total reflectance (ATR) accessory enables non-destructive, minimal-preparation analysis that supports both qualitative identification and quantitative monitoring. Instruments optimized for viscous/ liquid matrices reduce risk of spills, improve throughput in QA/QC environments, and provide reproducible pathlength control that enhances method precision and comparability.

Objectives and article overview

This application note describes the Thermo Scientific Nicolet Summit OA FTIR spectrometer as a dedicated analyzer for rapid characterization of viscous and liquid samples. The document presents the instrument’s design features, highlights the integrated multi-bounce ZnSe horizontal ATR (HATR) accessory, outlines software operating modes and workflows (OMNIC Paradigm), and summarizes typical application areas and performance advantages relevant to routine quality control and material identification.

Methodology

The Summit OA couples an FTIR interferometer and a horizontal multi-bounce ZnSe HATR trough to measure liquids and viscous samples. The HATR design yields multiple internal reflections at a reduced angle of incidence, producing a constant and reproducible effective pathlength that increases sensitivity for challenging analyte matrices. Typical workflows apply a simple measure-clean sequence for touchscreen operation or full spectral-analysis and calibration creation in desktop mode. Operator mode enables packaged, permission-controlled workflows for routine users.

Instrumentation used

• Thermo Scientific Nicolet Summit OA FTIR spectrometer with LightDrive Optical Engine (interferometer, laser and source covered by 10-year warranty).
• Integrated 40° zinc selenide (ZnSe) horizontal attenuated total reflectance (HATR) trough accessory with pinned, user-replaceable crystal plate.
• Built-in Windows 10 computer (requires only monitor, keyboard and mouse) and multi-colored LightBar LED status indicator.
• OMNIC Paradigm software with three operation modes (Touchscreen, Desktop, Operator) and seamless integration with TQ Analyst multivariate analysis package.

Main results and discussion

Key technical and performance points summarized from the material:

• Multi-bounce HATR vs single-bounce ATR: multi-reflection geometry and lower incidence angle increase instrument sensitivity and precision. The manufacturer reports roughly an eight-fold higher absorbance compared to single-bounce configurations for liquid samples, improving detection and quantitation for low-concentration components.
• Reproducible effective pathlength: the pinned ZnSe trough produces a constant optical interaction length between sample and evanescent wave, supporting robust quantitative calibration and reduced variability between measurements.
• Laboratory suitability: compact footprint, rugged construction and a spill-minimizing cover design make the Summit OA appropriate for busy QA/QC environments where viscous samples are frequently handled.
• Workflow flexibility: OMNIC Paradigm supports both rapid touch-and-go measurements for operators and detailed desktop tools for method development, spectral manipulation and calibration management; operator mode allows push-button, password-protected execution of validated workflows.
• Standards and applications: the platform is presented as compatible with routine test standards and industrial methods (examples cited include ASTM D7418, ASTM E2412, JOAP, and ASTM D7371 for FAME content in diesel), enabling conformity for specific quality-control tests.

Benefits and practical applications

The Summit OA design targets practical advantages for industrial and laboratory users:

• High sensitivity and precision for viscous/liquid matrices due to multi-bounce HATR geometry, improving detection of minor components.
• Minimal sample preparation and reduced risk of instrument contamination or damage because of the horizontal trough, leakproof cover and user-replaceable crystal plate.
• Fast throughput and streamlined operation through packaged workflows and simplified touchscreen mode, supporting non-expert operators in QA/QC settings.
• Robust, long-term performance backed by the LightDrive optical engine and extended warranty on core optical components.
• Typical application areas: food industry (e.g., quality and consistency checks for snack food oils), in-service lubricant monitoring, biodiesel blend/FAME analysis in fuels, and customized customer-specific assays.

Future trends and potential applications

Adoption of compact FTIR systems with integrated HATR is likely to expand for on-line and at-line quality control as industries prioritize faster decision-making, reduced sample handling and simplified user interfaces. Expected trends include:

• Greater use of multivariate chemometrics (e.g., PLS, PCA) and embedded analytics (TQ Analyst integration) for rapid quantitative calibrations and outlier detection.
• Increased deployment in decentralized testing locations (production floor, field labs) due to rugged form factor and simplified workflows.
• Development of expanded method libraries and application-specific workflow packages to accelerate method transfer and regulatory compliance.
• Integration with laboratory information management systems (LIMS) and IoT-enabled diagnostics for preventive maintenance and instrument performance tracking.

Conclusion

The Thermo Scientific Nicolet Summit OA FTIR spectrometer is presented as a purpose-built solution for rapid, reproducible analysis of viscous and liquid samples. Its multi-bounce ZnSe HATR accessory, durable optical engine, and workflow-focused software address common QA/QC needs: improved sensitivity for low-level analytes, consistent effective pathlength for quantitative work, and operational simplicity for high-throughput environments. These characteristics make it a practical choice for food, petrochemical and biodiesel testing scenarios where robust, routine analyses are required.

References

The source document is a manufacturer application note describing the Nicolet Summit OA FTIR spectrometer and OMNIC Paradigm software (Thermo Scientific product literature, 2021).