Simultaneous Analysis of 16 Sweeteners Using Triple Quadrupole LC/MS/MS [LCMS-8050]

Significance of the Topic

Artificial sweeteners are extensively employed in food and beverage products to provide low-calorie alternatives. Regulatory authorities set maximum levels for approved additives, while unapproved sweeteners introduced via imports require rigorous inspection. A unified method capable of detecting both designated and non-designated sweeteners supports food safety regulation and streamlines laboratory workflows.

Objectives and Study Overview

The study expands on prior work by developing a simultaneous quantitation method for 16 artificial sweeteners using a triple quadrupole LC–MS/MS system. The goal is to achieve sensitive, accurate, and high-throughput analysis that covers all major sweetener categories defined by food safety legislation.

Methodology and Instrumentation

Sample preparation consisted of simple solvent extraction with 0.1 % formic acid/methanol, followed by 100- or 1000-fold dilution, centrifugation and membrane filtration. Chromatographic separation was performed on a C18 column using a gradient of 5 mmol/L ammonium formate in water and methanol at 0.4 mL/min and 40 °C. Detection employed electrospray ionization in positive and negative modes with multiple reaction monitoring transitions optimized for each analyte.

Instrumentation Used

• Shimadzu LCMS-8050 triple quadrupole mass spectrometer
• Unison UK-C18 column, 150 mm × 3.0 mm, 3.0 µm
• HPLC system for gradient delivery and sample injection

Main Results and Discussion

All sweeteners demonstrated excellent linearity with correlation coefficients of 0.997 or higher over their respective calibration ranges. Limits of quantitation ranged from 0.05 to 5 ng/mL. Accuracy fell within ±20 % and repeatability (%RSD) was under 20 % at all calibration points. Recovery tests in soy sauce, powdered drink mix, café au lait and ketchup yielded values between 81 and 108 %, confirming method robustness across diverse food matrices.

Benefits and Practical Applications of the Method

• Simultaneous detection of 16 sweeteners, including both approved and non-approved additives
• Fast and simple sample preparation without complex cleanup
• High sensitivity suitable for trace monitoring and compliance testing
• Scalability for large sample batches in quality control and research laboratories

Future Trends and Potential Applications

Emerging improvements may include automation of sample handling, adoption of greener extraction solvents, and expansion of the analyte panel to new sweetener analogues. High-resolution mass spectrometry integration could enhance selectivity. This method framework can be adapted to other additive classes, meeting the evolving needs of food safety monitoring.

Conclusion

The described LC–MS/MS approach provides a reliable, high-throughput solution for simultaneous quantitation of 16 artificial sweeteners. Its simple workflow, strong analytical performance and broad applicability make it a valuable asset for regulatory compliance and food quality assurance.