Analysis of Saccharides Using Integrated HPLC and Size Exclusion-Ligand Exchange (Na Type) Column

Significance of the Topic

Saccharides are key contributors to sweetness and essential energy sources in foods. Accurate measurement of these compounds is critical for quality control, nutritional management, and mitigating health risks associated with excessive sugar intake.

Objectives and Study Overview

This work presents a streamlined approach to simultaneously quantify maltotriose, sucrose, glucose, and fructose in fruit juices using an integrated HPLC system equipped with a size exclusion–ligand exchange (Na type) column and differential refractive index detection.

Methodology and Instrumentation

• Column: Shim-pack SUR-Na (250 mm × 7.8 mm I.D., 8 µm) with guard column.
• Mobile phase: water only, eliminating the need for complex solvent preparation.
• Detector: RID-20A (refractive index detector) set at 40 °C.
• Column temperature: 80 °C; flow rate: 0.6 mL/min; injection volume: 10 µL.
• Sample preparation: mixed standards and 50× diluted fruit juices filtered through 0.2 µm PVDF membranes.

Main Results and Discussion

Baseline separation of the four saccharides was achieved, with calibration curves from 20 to 2000 mg/L showing excellent linearity (r2 ≥ 0.9999). Six consecutive injections of 50 mg/L standards yielded retention time RSDs under 0.02% and peak area RSDs below 0.6%. Fruit juice analyses quantified sucrose (absent in grape juice), glucose, and fructose levels in orange, mandarin, grape, pineapple, and grapefruit samples. Spike‐and‐recovery tests at 500 mg/L produced recoveries between 86% and 100%.

Benefits and Practical Applications

• Simultaneous profiling of major saccharides across various fruit juices.
• Simplified operation using only water as the mobile phase.
• High reproducibility and linearity ideal for routine QA/QC in the food industry.
• Compact integrated HPLC footprint with straightforward RID integration.

Future Trends and Potential Applications

Potential expansions include adaptation to other carbohydrate‐rich matrices, coupling with mass spectrometry for enhanced structural characterization, and automation of sample preparation to increase throughput and analytical depth.

Conclusion

The described integrated HPLC method with size exclusion–ligand exchange (Na type) column and refractive index detection provides a robust, efficient, and reliable platform for saccharide analysis in fruit juices, demonstrating outstanding linearity, precision, and recovery.

Reference

• World Health Organization (2015) Guideline: Sugars intake for adults and children