L-Proline supported on nano gold surface in PEG-400 catalyst system has been developed for use in the direct aldol condensation of acetone with aldehydes. Successful immobilization on surface of gold nanoparticles was confirmed using multiple analytical techniques. The supported catalyst could be separated from the reaction mixture by filtration, and could be reused five times with negligible loss in activity.
Chemically Reactive Immunogens Lead to Functional Convergence of the Immune Response
作者:Hagit Shulman、Carina Makarov、Anthony K. Ogawa、Floyd Romesberg、Ehud Keinan
DOI:10.1021/ja000616o
日期:2000.11.1
An aldolase antibody, 24H6, which was obtained from immunization with the large hapten 2, is shown to possess an active-site lysine residue with a perturbed pKa of 7.0. This antibody catalyzes both the aldol addition and the retrograde aldol fragmentation with a broad range of substrates that are structurally different from the hapten. This observation suggests that in reactive immunization with 1