title: A New HPLC-ELSD Method for Simultaneous Determination of N-Acetylglucosamine and N-Acetylgalactosamine in Dairy Foods.
abstract: A rapid high performance liquid chromatographic method with evaporative light scattering detection (HPLC-ELSD), using a carbohydrate column, was developed for simultaneous determination of N-acetylglucosamine (GlcNAc) and N-acetylgalactosamine (GalNAc) in dairy foods. Sample preparation was performed by precipitation using acetonitrile. The limits of detection were 2.097 mg/L for GlcNAc and 3.247 mg/L for GalNAc. The limits of quantification were 6.043 mg/L for GlcNAc and 9.125 mg/L for GalNAc. Accuracy ranged from 96.4 to 105.7% for GlcNAc and from 97.1 to 104.1% for GalNAc. The precision of the method was <1.7% for GlcNAc and <2.2% for GalNAc. The mean recovery of the method was measured by spiking samples with 30.0-120.0 mg/L GlcNAc or 12.5-50.0 mg/L GalNAc and was found to be 95.1-105.5% for GlcNAc and 99.5-105.9% for GalNAc. The stability test results of standard solutions stored at 4, 20, and 40°C were 96.2-104.7% for GlcNAc and 98.0-106.5% for GalNAc. This study determined GlcNAc and GalNAc in dairy foods using HPLC-ELSD method. This rapid, simultaneous quantitation method might be useful as a mean of convenient quality control of dairy foods.
authors.affiliation: National Agricultural Products Quality Management Service, Gimcheon 740-871, Republic of Korea; School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors.forename: Ho Jin
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors.forename: In Kyung
authors.initials: IK
authors.lastname: Bae
authors.affiliation: National Agricultural Products Quality Management Service, Gimcheon 740-871, Republic of Korea.
authors.forename: Min Hee
authors.initials: MH
authors.lastname: Jeong
authors.affiliation: National Agricultural Products Quality Management Service, Gimcheon 740-871, Republic of Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Park
authors.affiliation: National Agricultural Products Quality Management Service, Gimcheon 740-871, Republic of Korea.
authors.forename: Jin Sil
authors.initials: JS
authors.lastname: Jung
authors.affiliation: School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors.forename: Jang Eok
authors.initials: JE
authors.lastname: Kim