title: Improved selection of LMW over HMW proteins from human plasma by mesoporous silica particles with external modification.
abstract: Selective extraction of low molecular weight (LMW) proteins and peptides from complex biological samples plays an important role in the discovery of useful biomarkers and signaling molecules. Various methods, such as solid-phase extraction (SPE), ultrafiltration, and size-exclusion chromatography have been developed for such extraction purpose. In this study, we present, to our knowledge, the first demonstration of alkyl-diol@SiO(2) mesoporous material MCM-41 (alkyl-diol group on the external surface of mesoporous material) for selective extraction of LMW proteins and peptides from complex biological samples. The adsorption kinetics of LMW proteins, the influence of pH on adsorption and the desorption recovery by different elution solvents were investigated by using standard proteins as model samples. It was demonstrated that the modification of alkyl-diol group on the external surface could efficiently decrease the adsorption of HMW protein and increase the desorption recovery of LMW protein. Furthermore, the mesoporous materials were applied to selectively extract LMW proteins and peptides (<10 kDa) from crude human plasma. And the modified MCM-41 material had much better extraction selectivity and efficiency for LMW proteins and peptides than unmodified one.
authors.affiliation: Department of Instrumentation and Analytical Chemistry, Key Laboratory of Separation and Analysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, PR China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Qi
authors.forename: Junying
authors.initials: J
authors.lastname: Wei
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Yangjun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Qian
authors.forename: Yafeng
authors.initials: Y
authors.lastname: Guan
mesh_terms: D000327:Adsorption; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007328:Insulin / Q000097:blood / Q000737:chemistry / Q000302:isolation & purification; D007700:Kinetics; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D010316:Particle Size; D010455:Peptides / Q000097:blood* / Q000737:chemistry / Q000302:isolation & purification*; D016062:Porosity; D011506:Proteins / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D007328:Insulin; C509968:MCM-41; D010455:Peptides; D011506:Proteins; D012822:Silicon Dioxide