QA/QC of flours using the Agilent Cary 630 ATR-FTIR analyzer

Significance of the topic

Quality control of flour ensures product authenticity, regulatory compliance and uniform performance in baked goods. Differentiating flours by composition helps prevent mislabeling and supports consistent processing outcomes.

Objectives and overview of the study

The study demonstrates how a portable ATR-FTIR spectrometer (Agilent Cary 630) can be used for rapid QA/QC of a variety of flours. It evaluates the system’s ability to identify flour types and assess compositional uniformity in advance and bulk samples.

Methodology

A small amount of each flour sample was directly applied to the diamond ATR crystal using a pressure clamp. No sample preparation or weighing was required. Spectra were collected (64 scans, 4 cm-1 resolution) in approximately 30 seconds per sample.

Instrumentation

The Agilent Cary 630 ATR-FTIR analyzer features a rugged diamond ATR accessory and a portable form factor. Data acquisition and spectral comparison were performed using Agilent MicroLab FTIR software, which supports on-the-fly library creation and real-time identification.

Main results and discussion

Overlaying spectra of chickpea, rice, corn and other flours revealed distinct vibrational bands for proteins, carbohydrates, lipids and moisture. The software correctly identified unknown samples by matching spectra against a custom library. Batch-to-batch variability and vendor differences were quantified through pass/fail or percentage similarity metrics.

Benefits and practical applications

This ATR-FTIR method offers rapid, non-destructive analysis without solvents or reagents. Its portability allows on-site testing at receiving docks, storage facilities or process lines, ensuring consistent product quality and streamlined supply chain verification.

Future trends and applications

Integration with chemometric models and large spectral databases can enhance quantitative predictions of protein and moisture content. Automation and coupling with LIMS will enable real-time monitoring in industrial milling and baking operations. The approach can be extended to other powdered food ingredients and raw materials.

Conclusion

The Agilent Cary 630 ATR-FTIR analyzer provides a fast, robust and field-deployable solution for flour QA/QC by differentiating flour types and assessing compositional consistency, supporting regulatory compliance and process control.

References

• Karoui, R., Downey, G. & Blecker, C. (2010). Mid-infrared spectroscopy coupled with chemometrics: a tool for the analysis of intact food systems and the exploration of their molecular structure-quality relationships — a review. Chem. Rev., 110, 6144–6168.