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Determination of 35 Free Amino Acids in Tea Using Ultra-Performance Liquid Chromatography Coupled With Quadrupole Time-of-Flight Mass Spectrometry.

ABSTRACT: The purpose of this research was to develop a simple, sensitive, and accurate method for simultaneous determination of 35 free amino acids using ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS). Tea samples were extracted with boiling water bath, and then separated by XBridge BEH Amide column by gradient elution. The exact mass and MS/MS spectra of the target compound was detected under the TOF-MS and Information dependent acquisition (IDA)-MS/MS mode. The results demonstrated good linearity (R ² > 0.9980) in the range of 0.5-1,000 ng/mL. The limits of detection (LODs) were 0.13-25.00 mg/kg and the limits of quantitation (LOQs) were 0.25-50.00 mg/kg. The recovery rate ranged from 70.1 to 105.1% with relative standard deviations (RSDs) <11% (n = 6). This research provides a targeted strategy for developing an analysis method for amino acids in tea.

SUBMITTER: Li J

PROVIDER: S-EPMC8697017 | biostudies-literature |

REPOSITORIES: biostudies-literature

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