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Investigation of Breaking Efficiency of N-Glycosidic Bond Between Sulfonamide and Honey
Authors:WANG Yan-hua  LI Li  CHEN Chia-hung  CHENG Shuenn-ren  LEE Mu-sheng  YU Pu-ping  CHANG-CHIEN Guo-ping
Institution:1. College of Biology and Enviornmental Engineering, Zhejiang Shuren University,Hangzhou 310015, P.R.China
2. Super Micro Mass Research & Technology Center, Kaohsiung 833, Taiwan, P.R.China
3. Department of Business Administration, Kaohsiung 833, Taiwan, P.R.China
4. Super Micro Mass Research & Technology Center, Kaohsiung 833, Taiwan, P.R.China;Environmental Protection Bureau Kaohsiung City Government, Keelung 20143, Taiwan, P.R.China
5. Department of Mechanical Engineering, Cheng Shiu University, Kaohsiung 833, Taiwan, P.R.China
Abstract:Sulfonamide residue in honey existed in a form bonded to sugar via the N-glycosidic bond. It would result in the possible underestimation of concentration of sulfonamide if it is not decomposed by chemical methods. However, in Mainland China and Taiwan(P. R. China), the regulation for sulfonamide residue analysis does not include hydrolysis and has been applied to a very broad range of samples, for example, egg, milk, meat, seafood as well as honey. This paper demonstrates the necessity of hydrolysis of it prior to extracting honey. The breaking efficiencies of N-glycosidic bond were investigated by 2 mol/L hydrochloric acid, pure methanol and 0.5 mol/L hydrochloric acid in methanol, respectively. It was found that acid plays the key role in breaking the N-glycosidic bond, and it was also noticed that the dissolution of liberated sulfonamide in methanol could carry the reaction forward in favor of breaking the N-glycosidic bond.
Keywords:Sulfonamide  Honey  Liquid chromatography-electrospray ionization tandem mass spectrometry(LC-ESI-MS/MS)  N-Glycosidic bond
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