Ti-SBA-15, one of the latest titanium silicalite catalysts, has been prepared according to the literature by the direct hydrothermal synthesis using Pluronic 123 as structure-directing agent. The characterization of the catalyst was performed by means of the following methods: XRD, IR, UV–Vis, X-ray microanalysis and SEM. The catalytic properties of the Ti-SBA-15 catalyst have been tested in the epoxidation of allyl alcohol, methallyl alcohol, crotyl alcohol and 1-butene-3-ol with hydrogen peroxide. The process has been described by the following main functions: the selectivity to epoxide compound in relation to allylic compound consumed and the conversion of allylic compound.
Authors:Min Yang, Yu-pin Xu, Dong-hui Pan, Hong Din, Li-zhen Wang, and Guang-ji Wang
23-Hydroxybetulinic acid (23-HBA) is the efficient antitumor compound extracted from the roots of a Chinese Medicinal Herb,
Pulsatilla chinensis (Bge) Regel. To evaluate the effect of radioiodination on cytotoxicity, 23-HBA was radioiodinated with 125I. 125I-23-HBA could be prepared in high yields and good radiochemical purity and was characterized using reverse phase HPLC. In
ICR mice bearing Liver Cancer HepA tumor, 125I-23-HBA showed a tumor uptake of 2.1% ID/g at 2 h p.i. and 0.15% ID/g at 48 h p.i on i.v. injection. When injected intratumorally,
greater tumor uptake and retention was observed (20% ID/g at 2 h p.i. and 4.6% ID/g at 48 h p.i. respectively).
Authors:Maurizio Ferrante, Paolo Dottore, Morena Petrini, Paolo Trentini, and Giuseppe Spoto
of 35 dental resin composite monomers/additives in permanent 3T3 and three human primary fibroblast cultures . J Biomed Mater Res 41 : 474 – 480 10.1002/(SICI)1097-4636(19980905)41:3<474::AID-JBM18>3.0.CO;2-I
Authors:Yanling Zhao, Jiabo Wang, Limei Shan, Ruisheng Li, Dan Yan, and Xiaohe Xiao
.5–32.0 μg mL −1 . The k – c equation was k = 0.11832–0.00219 c , R = −0.8980; the t G – c equation was t G = 5.86874 + 0.15148 c , R = 0.9486; the R i – c equation was R i = 23.77397 + 1.40838 c , R = 0.8980. From these three equations, it
rate (dα/d t ) α, i ) [ 23 , 24 ]. The result of the isoconversional analysis is N discrete data sets, α j and E j , where E j is the activation energy at a given degree of transformation, α j . The step employed in the discretization of α is Δα