Determination of Sialic Acid in Edible Bird’s Nest Using UPLC-MS/MS
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Abstract:
A simple and sensitive UPLC-MS/MS method was developed and validated for the quantification of sialic acid (N-Acetyl neuraminic acid) in edible bird’s nest. After acid hydrolysis, sialic acid in edible bird’s nest was released from the combination state of glycoprotein sialic acid. The supernate was further cleaned up using Oasis HLB SPE, followed by washed with water. The Oasis HLB SPE was drained by vacuum pump at 40~60 kPa prior to be eluted by methanol. The eluate was concentrated by nitrogen at 40 ℃ water bath, and then settled to permit by mobile phase. UPLC-MS/MS in negative-ion and multiple reaction monitor mode was used to detect the sialic acid. Validation results indicated that the limit of detection was 0.02 mg/kg and the limit of quantification was 0.1 mg/kg. The assay showed a linear range of 0.1-50 mg/L and gave a correlation coefficient (r) of 0.999. The average recovery was 93.5% with relative standard deviations (RSD) of 1.52% (n=6). The method showed good reproducibility and high sensitivity, suitable for analysis of sialic acid in edible bird’s nest.
