Preferential adsorption and surface precipitation of lead(II) ions onto anatase in artificially contaminated Dixie clay.

During TEM-EDS (transmission electron microscopy coupled with an X-ray energy dispersive spectrometer) analysis of Dixie clay artificially contaminated with Pb(II), we observed that Pb(II) was preferentially adsorbed and precipitated on the surface of TiO. To deepen the understanding of the mechanism and importance of this phenomenon, batch sorption experiments, XANES (X-ray absorption near edge spectroscopy) analysis, and sequential extraction analysis were performed. The TiO in Dixie clay was found to be anatase, and anatase showed a higher Pb(II) sorption propensity than rutile, α-FeOOH, and one of two MnO investigated in this study.

Functional neoglycopeptides: synthesis and characterization of a new class of MUC1 glycoprotein models having core 2-based O-glycan and complex-type N-glycan chains.

An efficient protocol for the construction of MUC1-related glycopeptide analogues having complex O-glycan and N-glycan chains was established by integrating chemical and enzymatic approaches on the functional polymer platforms. We demonstrated the feasibility of sortase A-mediated ligation between two glycopeptide segments by tagging with signal peptides, LPKTGLR and GG, at each C- or N-terminal position. Structural analysis of the macromolecular N,O-glycopeptides was performed by means of ESI-TOFMS (MS/MS) equipped with an electron-captured dissociation device.