Abstract
Herein we describe a UPLC-FLD-based method for the quantification of the sialic acid content of red meat, using a synthetic neuraminic acid derivative as an internal standard. X-Gal-α-2,6-N-propionylneuraminic acid was synthesized via a chemoenzymatic pathway and its hydrolytic stability was characterized. Known quantities of this compound were incubated with samples of red meat under sialic acid-releasing conditions. The released sialic acids were derivatized, analyzed by UPLC-FLD, and the Neu5Ac/Neu5Gc content of the meat sample was determined by comparison with the internal standard. A number of red meats were analyzed by this method with the following results (Neu5Ac μg/g tissue, Neu5Gc μg/g tissue ± s.d.): pork (68 ± 3, 15.2 ± 0.7), beef (69 ± 8, 36 ± 5), lamb (46 ± 2, 33 ± 1), rabbit (59 ± 2, 0.4 ± 0.4), and hare (50 ± 4, 1 ± 1). We envisage that this methodology will find application in investigating the health effects of dietary Neu5Gc.
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Abbreviations
- CMP:
-
cytidyl 5′-monophosphate
- DCC:
-
dicyclohexylcarbodimide
- EcNeuS:
-
Escherichia coli neuraminic acid synthase
- ESI:
-
electrospray ionization
- FLD:
-
fluorescence detector
- Kdn:
-
α-2,6-keto-3-deoxy-d-glycero-d-galactononic acid
- MALDI:
-
matrix-assisted laser desorption ionization
- MS:
-
mass spectrometry
- Neu5Ac:
-
N-acetylneuraminic acid
- Neu5Gc:
-
N-glycolylneuraminic acid
- Neu5Pr:
-
N-propylneuraminic acid
- NHS:
-
N-hydroxysuccinimide
- NmCSS:
-
Neisseria meningitidis CMP-sialic acid synthase
- PdST6:
-
Photobacterium damselae α-2,6-sialyltransferase
- OPD:
-
o-phenylenediamine
- UPLC:
-
ultra high performance liquid chromatography
- X-Gal:
-
5-bromo-4-chloro-indolyl-β-d-galactopyranoside
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Acknowledgments
The authors would like to thank Prof. Akemi Suzuki (Hiratsuka, Japan) for helpful discussions on sialic acids.
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This work was supported in parts by the Natural Science Foundation of China (grant number 31,471,703 to L.L. and J.V., A0201300537 to J.V. and L.L.), Natural Science Foundation of the Jiangsu Province Higher Education Institutions (grant number 13KJD230002 to L.H.Y.), and the 100 Foreign Talents Plan (grant number JSB2014012 to J.V.).
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Yao, H.L., Conway, L.P., Wang, M.M. et al. Quantification of sialic acids in red meat by UPLC-FLD using indoxylsialosides as internal standards. Glycoconj J 33, 219–226 (2016). https://doi.org/10.1007/s10719-016-9659-1
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DOI: https://doi.org/10.1007/s10719-016-9659-1