Determination of Sucrose Levels in Infant Cereals Using the Agilent Cary 630 ATR-FTIR Spectrometer

Significance of the Topic

Sugar coating of infant cereals influences both sensory properties and consumer health. Monitoring sucrose levels is essential to control nutritional content, meet regulatory requirements, and support quality assurance in food production.

Objectives and Study Overview

This study aimed to assess the Agilent Cary 630 ATR-FTIR spectrometer as a rapid, non-destructive alternative to HPLC for quantifying sucrose, glucose, and fructose in infant cereal products.

Instrumentation Used

• Agilent Cary 630 FTIR with single-reflection diamond ATR interface and integrated sample press
• Agilent 4500 portable FTIR spectrometer for field applications
• Standard HPLC system for reference sugar measurements
• Multivariate analysis software implementing Savitzky–Golay filtering and partial least squares (PLS) regression

Methodology

Infant cereal samples—including plain, sucrose-coated, and flavored varieties—were ground and applied directly to the ATR crystal. Mid-infrared spectra (4,000–700 cm–1, 4 cm–1 resolution, 64 co-added scans) were collected, normalized, and transformed using a second-derivative Savitzky–Golay filter. PLS regression models correlated spectral data with HPLC reference values.

Main Results and Discussion

• Sucrose calibration covered 0.5–18.1% (w/w) with an external validation range of 0.6–16.7%.
• Correlation coefficients exceeded 0.97 for sucrose and 0.96 for total sugar content.
• Standard error of cross-validation was 1.46% for sucrose and 1.56% for total sugars.
• Predictive performance matched HPLC accuracy, demonstrating suitability for real-time monitoring.

Benefits and Practical Applications of the Method

• Direct analysis of ground cereal without dilution or extensive preparation.
• Substantially reduced analysis time compared to traditional chromatography.
• Lower technical expertise required for reliable results.
• Portability enables on-site quality control at production lines or receiving docks.
• Non-destructive screening supports rapid decision making and process optimization.

Future Trends and Applications

• Deployment of handheld FTIR instruments for continuous, in-line monitoring.
• Enhanced chemometric and machine learning algorithms for improved predictive accuracy.
• Integration with wireless networks and cloud analytics for remote quality management.
• Extension of FTIR methods to additional food matrices and compositional analyses (e.g., moisture, protein).

Conclusion

The Agilent Cary 630 ATR-FTIR system offers a fast, reliable, and user-friendly alternative to HPLC for sugar quantification in infant cereals. Its minimal sample preparation, robust PLS calibrations, and portability make it an effective tool for routine quality control and real-time analysis in the food industry.

References

1. Lin C-A, Ayvaz H, Rodriguez-Saona LEC. Application of portable and handheld infrared spectrometers for determination of sucrose levels in infant cereals. Food Anal Methods. 2014;7:1407–1414.
2. Farooq Z, Ismail A. QA/QC of sugars using the Agilent Cary 630 ATR-FTIR analyzer. Agilent Application Note 5991-0786EN. 2012.
3. Rein A. FTIR analysis provides rapid QA/QC and authentication of food ingredients prior to processing. Agilent Application Note 5991-1246EN. 2012.
4. Piroutte Chemometric Modelling Software. Infometrix Inc; Woodville, WA.
5. Agilent 4500 Series Portable FTIR Spectrometer. Product information. Agilent Technologies.