LI Pei-pei,YAN Zhong-yong,CHEN Yin,et al.Determination of Sialic Acid in Fish by Ultra High Performance Liquid Chromatography with DMBA Derivatization[J].Journal of Instrumental Analysis,2022,41(11):1684-1689.
LI Pei-pei,YAN Zhong-yong,CHEN Yin,et al.Determination of Sialic Acid in Fish by Ultra High Performance Liquid Chromatography with DMBA Derivatization[J].Journal of Instrumental Analysis,2022,41(11):1684-1689. DOI: 10.19969/j.fxcsxb.22042904.
Determination of Sialic Acid in Fish by Ultra High Performance Liquid Chromatography with DMBA Derivatization
An ultra high performance liquid chromatography-fluorescence detection(UPLC-FLD) method was developed for the simultaneous determination of 3 core kinds of sialic acids(SAs) including N-acetylneuraminic acid(Neu5Ac),N-glycolylneuraminic acid(Neu5Gc) and 2-keto-3-deoxynononic acid(KDN) in fish. The freeze-dried samples were acid hydrolyzed with 8 mL 0.6 mol/L hydrochloric acid solution for 20 min at 80 ℃,followed by derivatization with 4,5-dimethylbenzene-1,2-diamine(DMBA).The derivative conditions for DMBA were optimized by single factor test.All the target compounds were separated on an Waters Acquity UPLC BEH C,18, column(100 mm × 2.1 mm,1.7 μm) by gradient elution,using pure water and acetonitrile as eluents,then detected by UPLC-FLD.Under the optimized conditions,there were good linear relationships for Neu5Ac,Neu5Gc and KDN in the range of 0.02-5.0 μg/mL(,r,2,>, 0.999),with their limits of quantitation(,S,/,N ,= 10) of 0.20 μg/g,0.20 μg/g and 0.10 μg/g,respectively.The spiked recoveries for three SAs at three levels ranged from 90.8% to 103%,with relative standard deviations(RSDs) of 2.8%-5.0%.The analysis was rapid,and it could be achieved within 4 min with good separation and sharp peak shapes.With the characteristics of high accuracy and good precision,the method was suitable for the simultaneous determination of Neu5Ac,Neu5Gc and KDN in fish.
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