Quantitative determination of limonin in citrus juices by HPLC using computerized solvent optimization

Area of Science:

• Analytical Chemistry
• Food Chemistry

Background:

• Limonin is a bitter principle found in citrus fruits like grapefruit and navel oranges.
• Accurate quantification of limonin is important for citrus juice quality control.
• Existing methods for limonin separation may require optimization for efficiency.

Purpose of the Study:

• To optimize a high-performance liquid chromatography (HPLC) method for the efficient separation of limonin.
• To utilize the Drylab software for method optimization using binary solvent mixtures.
• To compare the optimized HPLC method's results with other analytical techniques.

Main Methods:

• Employed the Drylab software to optimize HPLC separation conditions for limonin.
• Investigated binary solvent mixtures (acetonitrile in water) and flow rates.
• Utilized a 5-micron C18 column (10 cm length) for separation.
• Analyzed grapefruit and navel orange juice samples using the optimized HPLC method.

Main Results:

• Identified optimal separation conditions: 30-32% acetonitrile in water at 0.9 mL/min.
• Achieved efficient separation of limonin within a reasonable timeframe.
• HPLC results for limonin content were comparable to those obtained by enzyme immunoassay and thin-layer chromatography (TLC).

Conclusions:

• The Drylab software effectively optimized HPLC for limonin separation in citrus juices.
• The developed HPLC method provides an efficient and accurate means for analyzing limonin content.
• This optimized method can be a valuable tool for citrus juice quality assessment.