SEC for fingerprint analysis of gummy candies

Importance of Topic

Size Exclusion Chromatography (SEC) fingerprinting of gummy candies is critical for ensuring consistent texture, taste and safety in the confectionery industry. By revealing polymer and low-molecular-weight profiles, this method supports rapid quality checks, process monitoring and raw-material authentication, addressing the challenges posed by varying gelling agents and complex formulations.

Objectives and Overview

The study aimed to evaluate SEC as a tool for product quality and process control of gummy candies. Key goals included:

• Developing reproducible fingerprints for different gelling agents (porcine gelatin, bovine gelatin, pectin).
• Comparing sample preparation strategies (heated vs non-heated) and column configurations.
• Assessing the method’s ability to differentiate formulations, detect production errors and monitor storage-related changes.

Methodology and Instrumentation

Seven gummy candy samples and selected reference standards (gelatins, sugars, organic acids) were prepared in phosphate-buffered saline (pH 7.4). Two replicates per sample were shaken overnight; one set was heated briefly at 40 °C, the other filtered directly. All solutions were filtered (0.45 µm) prior to injection. SEC separations were performed isocratically at 1 mL/min, 30 °C, with 20 µL injections. Detection combined a diode array detector (DAD, 190–700 nm) and a refractive index detector (RID). Two column setups were tested:

• Single AppliChrom® Multipore SuperOH-P column (100–1 000 000 Da).
• Coupled AppliChrom® SuperOH-P-350 and SuperOH-P-150 columns for extended resolution (100–1 000 000 Da).

Used Instrumentation

• AZURA® Eluent Tray E 2.1 L
• AZURA® P 6.1 L Pump LPG, stainless steel (10 mL/min)
• AZURA® DAD 2.1 L Diode Array Detector (190–700 nm)
• AZURA® RID 2.1 L Refractive Index Detector
• AZURA® AS 6.1 L Autosampler
• AZURA® CT 2.1 Column Thermostat (5–85 °C)
• AppliChrom® SuperOH-P-150 (300×8 mm, 7 µm)
• AppliChrom® SuperOH-P-350 (300×8 mm, 10 µm)
• AppliChrom® Multipore SuperOH-P (300×8 mm, 7 µm)
• ClarityChrom® 9.1.0 software (single-station, PDA and GPC modules)

Main Results and Discussion

• Sample preparation: Non-heated replicates of gelatin-based candies showed superior reproducibility, while pectin-based samples were unaffected by brief heating.
• System peaks: Two consistent background peaks in RID were identified and excluded by blank overlay.
• Column performance: The coupled column set yielded higher resolution, clearly separating gelatin profiles and low-molecular-weight components.
• Fingerprint evaluation: RID and DAD at 230 nm provided the most distinct fingerprints. UV traces at 210 nm further enhanced differentiation.
• Gelatin origin: SEC profiles matched porcine and bovine gelatin references, enabling reliable halal compliance verification.
• Sugar and acid estimation: RID responses to sucrose and other standards allowed semi-quantitative comparison of sugar content between samples.

Benefits and Practical Applications

• Rapid quality control and batch consistency checks.
• Detection of gelling agent source and supplier authentication.
• Monitoring of manufacturing deviations and storage-related changes.
• Preliminary screening of sugar and organic acid levels without dedicated HPLC assays.

Future Trends and Opportunities

• Integration of flow markers to correct retention time shifts and enhance reliability.
• Application of chemometric tools for automated fingerprint classification.
• Extension to other polymer-based products in food and pharmaceutical industries.
• Development of quantitative SEC protocols using multi-point calibration for precise concentration measurements.

Conclusion

SEC fingerprinting using aqueous mobile phases, combined DAD and RID detection and optimized column configurations provides a robust, reproducible approach for comprehensive quality and process control of gummy candies. The method effectively distinguishes gelling agents, verifies gelatin origin, monitors storage stability and offers semi-quantitative analysis of low-molecular-weight ingredients. Its adaptability to various formulations makes it a valuable tool for routine QC and research applications.

References

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