Analysis of sugars using an Agilent InfinityLab Poroshell 120 HILIC-Z column

Significance of the Topic

Polar and reducing sugars play key roles in food quality, fermentation processes, biofuel development and agrochemical analysis. Reliable chromatographic methods that deliver high resolution, robust column life and control of anomer separation are crucial for routine testing in research, QA/QC and industrial laboratories.

Objectives and Study Overview

• Evaluate separation of 11 common sugars using an Agilent InfinityLab Poroshell 120 HILIC-Z column.
• Compare gradient versus isocratic elution performance.
• Assess the impact of pH and temperature on anomer resolution and column durability.
• Identify optimal conditions for peak shape, sensitivity and operational lifetime.

Methodology

Sugar standards (xylose, arabinose, fructose, mannose, glucose, galactose, sucrose, maltose, lactose, maltotriose, raffinose) were prepared as saturated solutions in 90:10 acetonitrile/water. Injection volumes ranged from 0.1 to 7 µL. Two approaches were tested:

• Gradient elution: 0.3 % ammonium hydroxide in water (A) vs. 0.3 % ammonium hydroxide in acetonitrile (B), gradient from 85 % to 60 % B over 6 min, flow 0.4 mL/min, column at 35 °C, ELSD at 60 °C, 3.5 bar, 30 Hz.
• Isocratic elution: same mobile phases with 80 % B, 0.4 mL/min, 35 °C, ELSD settings identical.

Used Instrumentation

• Agilent 1260 Infinity binary LC system
• Agilent G4218A evaporative light scattering detector (ELSD)
• Agilent InfinityLab Poroshell 120 HILIC-Z column, 2.1×100 mm, 2.7 µm
• Agilent OpenLAB software for control and data processing

Main Results and Discussion

Gradient separation at high pH (~10.8) and 35 °C provided sharp peaks and controlled anomer resolution for most sugars, although critical pairs (xylose/arabinose and glucose/galactose) required longer columns or run times for baseline separation. Column lifetime testing showed that high pH with low temperature sustained performance over 14 000 column volumes, whereas high temperature at neutral pH led to faster degradation. Isocratic runs achieved similar analysis times but with reduced resolution for early- or late-eluting analytes and lower sensitivity on later peaks.

Benefits and Practical Applications

• Efficient separation of polar, anomeric sugars in food, fermentation and biofuel testing.
• High throughput with gradient or isocratic options depending on resolution needs.
• Extended column life under optimized high-pH, low-temperature conditions.
• Compatibility with ELSD for non-UV-active analytes.

Future Trends and Applications

Further improvements may include longer or narrower columns to enhance critical-pair resolution, integration with mass spectrometry for structural confirmation and expansion to other polar metabolites. Advances in stationary phase chemistries will continue to drive high-throughput polar analyte profiling in regulatory and research environments.

Conclusion

The Agilent InfinityLab Poroshell 120 HILIC-Z column delivers robust, high-efficiency separation of a broad range of sugars. Optimal performance is achieved using a high-pH ammonium hydroxide mobile phase at moderate temperature, balancing peak shape, resolution and column longevity for routine and high-throughput analyses.

References

• No literature citations provided in the original text.