title: Mesoporous tungsten titanate as matrix for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis of biomolecules.
abstract: In this paper, mesoporous tungsten titanate (WTiO) with different nano-pore structures was utilized as matrix for the analysis of short peptides by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS). Effect of characteristic features of mesoporous matrices on laser desorption/ionization process was investigated. Experiments showed that the ordered two-dimensional and three-dimensional mesoporous matrices were superior in performance to the non-ordered WTiO matrix. The dramatic enhancement of signal sensitivity by the ordered mesoporous matrices can be reasonably attributed to the ordered structure, which facilitated the understanding on structure-function relationship in mesoporous cavity for laser desorption process of adsorbed biomolecules. With the ordered mesoporous matrix, the short peptides are successfully detected. The presence of trace alkali metal salt effectively increased the analyte ion yields and the MALDI-TOFMS using the inorganic mesoporous matrices displayed a high salt tolerance. The developed technique also showed a satisfactory performance in peptide-mapping and amino-acid sequencing analysis.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, PR China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Shan
authors.forename: Lu
authors.initials: L
authors.lastname: Han
authors.forename: Minjia
authors.initials: M
authors.lastname: Yuan
authors.forename: Chunhui
authors.initials: C
authors.lastname: Deng
authors.forename: Dongyuan
authors.initials: D
authors.lastname: Zhao
authors.forename: Bo
authors.initials: B
authors.lastname: Tu
authors.forename: Pengyuan
authors.initials: P
authors.lastname: Yang
mesh_terms: D000468:Alkalies / Q000737:chemistry; D019411:Clinical Laboratory Techniques; D013058:Mass Spectrometry / Q000379:methods*; D036103:Nanotechnology; D010087:Oxides / Q000737:chemistry*; D010455:Peptides / Q000032:analysis*; D012492:Salts / Q000737:chemistry; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D013995:Time; D014414:Tungsten / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*
chemical_list: D000468:Alkalies; D010087:Oxides; D010455:Peptides; D012492:Salts; D017973:Tungsten Compounds; C520567:tungsten titanate; D014414:Tungsten