Abstract
A simple method using reversed phase high-performance liquid chromatography (RP-HPLC) was developed for the simultaneous analysis of 13 amino acids. Amino acids were pre-column derivatized with 9-fluorenylmethyl chloroformate (FMOC-Cl) before analysis by RP-HPLC. Experimental parameters affecting the derivatization and chromatographic separation were investigated. Amino acids were derivatized with FMOC-Cl under alkaline condition in 0.1 mol/L borate buffer pH 10.0 at room temperature. The FMOC-amino acid derivatives were separated on an Atlantis C18 column under the gradient elution of 0.05 % trifluoroacetic acid and acetonitrile and UV detection at 265 nm. Linear ranges were 0.2–100.0 μg/mL with the correlation coefficients greater than 0.992. Limits of detection and limits of quantitation were in the range of 0.05–2.0 and 0.2–5.0 µg/L, respectively. The intra-day precision (n = 3) of retention time was less than 1 %, while for the peak area was less than 4 %. The inter-day precision (n = 3 × 3) of retention time was less than 2 % and the peak area was less than 8 %. This method was applied in honey samples and the results showed that proline is the major amino acids in honey samples.
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Acknowledgments
Financial support from the Center of Excellence for Innovation in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education, Thailand and the Thailand Research Fund (TRF) through the Royal Golden Jubilee (RGJ) Ph.D. Program (Grant No. PHD/0354/2551) to Suthasinee Boonchiangma and Supalax Srijaranai are gratefully acknowledged.
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Published in the topical collection 20th International Symposium on Separation Sciences in Prague with guest editors Aleš Horna and Pavel Jandera.
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Boonchiangma, S., Ratchakrut, P., Chanthai, S. et al. Reversed Phase Chromatographic Analysis of 13 Amino Acids in Honey Samples. Chromatographia 78, 923–927 (2015). https://doi.org/10.1007/s10337-015-2894-y
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DOI: https://doi.org/10.1007/s10337-015-2894-y