Analysis of Anthocyanins

Importance of the topic

Anthocyanins are a class of flavonoid pigments responsible for red, purple, and blue colors in many fruits, vegetables, and flowers. Beyond their visual appeal, these compounds exhibit significant antioxidant activity and contribute to health benefits, making their accurate analysis crucial in food science, nutraceutical development, quality control, and research on plant metabolites.

Study objectives and overview

This application note describes the development of a reversed-phase liquid chromatography method for the separation and quantification of four key anthocyanins: delphinidin-3-galactoside, delphinidin-3-glucoside, cyanidin-3-galactoside, and chrysanthemin (cyanidin-3-glucoside). The aim was to achieve baseline resolution within a short analysis time using Shimadzu’s Shim-pack GIST-HP C18 column on the Nexera X3 platform.

Methodology

A binary gradient was employed, with mobile phase A consisting of 2% formic acid in water and mobile phase B comprising 2% formic acid in a 1:1 (v/v) mixture of water and acetonitrile. The gradient program ramped from 15% B at 0–3 min to 30% B at 15 min, then to 100% B at 15.01–20 min, before returning to 15% B by 25 min. The flow rate was set to 1.0 mL/min at a maximum pressure of 16 MPa. Column temperature was maintained at 40 °C, injection volume was 10 µL, and detection was performed at 520 nm using a tungsten lamp.

Instrumentation used

• Nexera X3 UHPLC system (Shimadzu)
• Shim-pack GIST-HP C18 column, 150 mm × 4.6 mm I.D., 3 µm particle size
• UV–Vis detector set at 520 nm

Main results and discussion

The chromatogram demonstrated clear, symmetrical peaks for all four anthocyanins, eluting in the following order: delphinidin-3-galactoside, delphinidin-3-glucoside, cyanidin-3-galactoside, and chrysanthemin. Complete separation was achieved within 15 minutes, highlighting the efficiency of the gradient and column selectivity. Peak resolution exceeded 1.5 for adjacent compounds, ensuring reliable quantification.

Benefits and practical applications

• Rapid profiling of anthocyanin composition in food and botanical extracts
• Quality control in nutraceutical and beverage industries
• Monitoring antioxidant levels in research and development workflows

Future trends and potential applications

Advancements may include coupling with high-resolution mass spectrometry for structural confirmation, adoption of sub-2 µm or core-shell columns for even faster separations, and application to complex matrices such as wines, juices, and plant tissues. Automation and online sample preparation could further enhance throughput and reproducibility.

Conclusion

The described method using Shim-pack GIST-HP C18 and the Nexera X3 system offers a robust, reproducible, and rapid approach for anthocyanin analysis, balancing high resolution with short run times. It supports diverse applications in food science, quality control, and metabolic research.

References

1. Application News 01-00185 (JP), Shimadzu Corporation, First Edition: Dec. 2021