title: Quantitative determination of bovine caseinoglycomacropeptide in infant formulas by ultra-high-performance liquid chromatography-electrospray-ionization mass spectrometry.
abstract: An ultra-high-performance liquid chromatography-electrospray ionization coupled to mass spectrometry method has been developed for determining caseinoglycomacropeptide (CGMP) in infant formulas by selected ion reaction and area monitoring modes. The present study focused on the optimization of sample pretreatment, chromatographic resolution and mass spectrometry parameters. After a simple sample pretreatment, the two genetic variants of caseinoglycomacropeptide, CGMP(A) and CGMP(B), were separated using a BEH300 C(18) column by gradient elution. The established method was extensively validated by determining the linearity (R(2)>0.999), average recovery (95.8-118.4%), inter-day precision (relative standard deviation ≤7.81%) and intra-day precision (relative standard deviation ≤6.99%) based on two scan modes. To further verify the applicability of the method, 21 brands of commercial available infant formulas were analyzed. The results showed that the present method is selective, sensitive and reliable for separating and quantifying two genetic variants (CGMP(A) and CGMP(B)) of caseinoglycomacropeptide in infant formulas with complex matrix.
authors: Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang, P. R. China.
authors: Jingshun
authors: J
authors: Zhang
authors: Yiping
authors: Y
authors: Ren
authors: Zhenyi
authors: Z
authors: Ma
authors: Baifen
authors: B
authors: Huang
authors: Zengxuan
authors: Z
authors: Cai
authors: Duo
authors: D
authors: Li
mesh_terms: D000818:Animals; D002364:Caseins / Q000737:chemistry*; D002417:Cattle; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006020:Glycopeptides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D041943:Infant Formula / Q000737:chemistry*; D055550:Protein Stability; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D002364:Caseins; D006020:Glycopeptides; C020251:kappa-casein glycomacropeptide