Fast Analysis of Fruit Juice Acids with an Agilent Poroshell 120 SB-Aq Column

Importance of the Topic

Organic acid profiles serve as stable markers for fruit juice authenticity and purity. Accurate and rapid analysis is crucial to detect microbial contamination or adulteration in juice products.

Aims and Study Overview

This study demonstrates a rapid reversed-phase HPLC method using an Agilent Poroshell 120 SB-Aq column to separate and quantify tartaric, quinic, malic, citric and fumaric acids in fruit juices, with the goal of efficient quality control and authenticity verification.

Methodology and Instrumentation

Analysis was performed on an Agilent 1200 Infinity Series system equipped with a binary pump, autosampler, thermostatted column compartment and diode array detector at 226 nm. Chromatographic separation used a 3 × 100 mm, 2.7 µm Poroshell 120 SB-Aq column. The mobile phase was 100 mM potassium dihydrogen phosphate buffer (pH 2.5) at 0.5 mL/min and 50 °C.

Main Results and Discussion

All five organic acids eluted within two minutes under fully aqueous conditions. The Poroshell 120 SB-Aq column maintained retention times without phase collapse even after prolonged exposure to 100% aqueous buffer and flow stoppages. Chromatograms of cranberry cocktail, grapefruit and orange juices showed clear, reproducible separation of target acids.

Benefits and Practical Applications

• Complete analysis, including sample preparation, in under ten minutes.
• Simultaneous quantification of five acids improves laboratory throughput.
• High stability in 100% aqueous mobile phases ensures consistent performance.
• Method supports routine quality control, authenticity testing and detection of adulteration in fruit juices.

Future Trends and Potential Uses

Further reduction of analysis time through advanced column technologies and higher-pressure systems. Integration with automated sampling and real-time data analytics could enable inline monitoring of production. Application to a broader range of food and beverage matrices is anticipated.

Conclusion

The presented HPLC method with the Poroshell 120 SB-Aq column delivers fast, precise determination of key organic acids in fruit juices, combining rapid throughput with robust performance in fully aqueous mobile phases, making it ideal for routine quality and authenticity assessments.

Used Instrumentation

• Agilent 1200 Series Binary Pump SL
• Agilent 1200 Series Automatic Liquid Sampler SL
• Agilent 1200 Series Thermostatted Column Compartment
• Agilent 1200 Series Diode Array Detector
• Agilent Poroshell 120 SB-Aq column, 3 × 100 mm, 2.7 µm

Reference

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