title: MALDI-TOF-MS analysis of small molecules using modified mesoporous material SBA-15 as assisted matrix.
abstract: Mesoporous silica, SBA-15 was successfully functionalized with quinoline moiety, and was applied as a matrix in the MALDI-TOF-MS analysis of small molecules. The modified SBA-15 material [SBA-15-8-(3-(triethoxysilyl)propoxy) quinoline, SBA-15-8QSi] was obtained by using calcined SBA-15 and 8-hydroxy quinoline. The structure of the functionalized mesoporous material was systemically characterized by TEM, the N(2) adsorption-desorption isotherm technique and FT-IR spectra. Compared with DHB and SBA-15, SBA-15-8QSi demonstrated several advantages in the analysis of small molecules with MALDI-TOF-MS, such as less background interference ions, high homogeneity, and better reproducibility. Based on these results, the various analytical parameters were optimized. The ideal operating conditions were (1) methanol used as the dissolving solvent; (2) sample first dropping method; (3) a ratio between the analyte and the matrix of 3.5:10. Under these optimization conditions, a low detection limit (8 pmol for L-Arginine-HCl) and high reproducibility (< or = 29%) were obtained. This technique was successfully applied to the analysis of various types of small molecules, such as saccharides, amino acids, metabolites, and natural honey.
authors.affiliation: Key Laboratory of Nature Resource of Changbai Mountain and Functional Molecular (Yanbian University), Ministry of Education, Jilin, China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Li
authors.forename: Xue
authors.initials: X
authors.lastname: Wu
authors.forename: Ji Man
authors.initials: JM
authors.lastname: Kim
authors.forename: Sung Soo
authors.initials: SS
authors.lastname: Kim
authors.forename: Mingshi
authors.initials: M
authors.lastname: Jin
authors.forename: Donghao
authors.initials: D
authors.lastname: Li
mesh_terms: D000596:Amino Acids / Q000032:analysis*; D019411:Clinical Laboratory Techniques; D005841:Gentisates / Q000737:chemistry; D006722:Honey / Q000032:analysis*; D000432:Methanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D011804:Quinolines / Q000737:chemistry; D012015:Reference Standards; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013395:Sucrose / Q000032:analysis*; D013499:Surface Properties
chemical_list: D000596:Amino Acids; D005841:Gentisates; D011804:Quinolines; C509969:SBA-15; D012997:Solvents; D013395:Sucrose; D012822:Silicon Dioxide; C010925:2,5-dihydroxybenzoic acid; D000432:Methanol