Efficient capillary electrophoresis separation and determination of free amino acids in beer samples

Electrophoresis
Miaomiao TianLi Yang

Abstract

Simultaneous detection of various o-phthalaldehyde (OPA)-labeled amino acids (AAs) in food samples was reported based on CE separation. Ionic liquid was used for the first time for CE analysis of AAs with in-capillary derivatization. Several other additives, including SDS, α/β-CD, and ACN, as well as key parameters for CE separation (buffer pH value, separation voltage), were also investigated. Our results show that the multiple additive strategy exhibits good stable and repeatable character for CE analysis of OPA-labeled AAs, for either in-capillary derivatization or CE separation, and allows simultaneous quantification of different OPA-labeled AAs in a large concentration range of 50 μM to 3.0 mM with LOD down to 10 μM. Seventeen OPA-labeled AAs, except for two pairs of AAs (His/Gln and Phe/Leu), which were separated with resolutions of 1.1 and 1.2, respectively, were baseline separated and identified within 23 min using the present multiple additive strategy. The method was successfully applied for simultaneous analysis of AAs in seven beer samples and as many as eleven trace-amount AAs were detected and quantified, indicating the valuable potential application of the present method for food analysis.

References

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Citations

Aug 11, 2015·Electrophoresis·Alain Wuethrich, Joselito P Quirino
Oct 6, 2015·Electrophoresis·Véréna PoinsotFrançois Couderc
Jun 11, 2014·Journal of Chromatography. a·Constantina P Kapnissi-ChristodoulouMaria C Mavroudi
Dec 13, 2017·Electrophoresis·Renata Corrêa de CarvalhoFlávia Ferreira de Carvalho Marques
Jan 27, 2020·Pharmacological Research : the Official Journal of the Italian Pharmacological Society·Chen LiangYuxin Li
Jul 13, 2021·Analytica Chimica Acta·Hai Yen TaFrancois Couderc

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