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Xu, Jian,Cao, Lei,Feng, Yongyi,Huang, Yanlin,Wang, Yaorong,Qin, Lin,Seo, Hyo Jin Elsevier 2017 Journal of luminescence Vol.183 No.-
<P><B>Abstract</B></P> <P>In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> is a known indium-based scintillator with fast ultraviolet photoluminescence. Unfortunately the emission only can be detected below 200K. the poor thermal stability limits its application at room temperature. In this work, the luminescence improvement of In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> was realized by F<SUP>−</SUP>-ions doping in the lattices. The ceramic phosphors were via typical solid-state reaction method. The pure crystalline phase with thortveirite-type structure was confirmed by X-ray diffraction (XRD) Rietveld refinements. The photoluminescence (PL) emission and excitation spectra together with the luminescence thermal stability were tested. The fluorescence decay curves CIE emission Stokes shifts were measured. The ceramic samples could present blue luminescence with maximum wavelength at about 340nm under the excitation of UV light or high energy X-ray irradiation. The pure sample only presents luminescence below 200K, however, the F-doping can be greatly enhance the luminescence thermal stability. The F-doped In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> could present emission signals with fast decay lifetime of 850ns at room temperature. The luminescence transitions from the In<SUP>3+</SUP>-O<SUP>2−</SUP> charge transfer (CT) were discussed on the structure properties.</P>
Three New 29 Carbon Skeletons Pentacyclic Triterpenoids and S-equol from Biogas Slurry
Jian-Feng Xu,Hui-Bin Wu,Ding-Cai Liu,Long Sha,Wen-Hui Wu,Hua Fan,Yishan Song,Hong-Guang Zhu 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.12
Bioactive natural products were firstly obtained from biogas slurry. Three new 29 carbon skeletons of the pentacyclic triterpenoid compounds 24-norolean-12-ene-3,22-dione (1), 3β-hydroxy-24-norolean-12-ene-22-one (2), 3α-hydroxy-24-norolean-12-ene-22-one (3), as well as one known compound S-equol (4) were isolated and purified from the MeOH extract of chicken manure biogas slurry. The molecular structures of the four compounds were elucidated based on the extensive spectroscopic data analysis, and the structure of Compound 1 was further confirmed by single-crystal X-ray diffraction. The structures of Compounds 1, 2, and 3 are similar with oleanolicum and hederagenin that has excellent anti-tumor activities. The cytotoxicity against five cancer cell lines (Hela, A549, MCF7, PC3, and B16) of Compounds 1–4 was tested. Similar to Compound 4 (S-equol), Compounds 1–3 (pentacyclic triterpenoids) showed cytotoxicity activity against different tumor cell lines. Compounds 1–3 showed slightly lower cytotoxicity activities than Compound 4. The IC50 of Compound 4 was determined to be 9.7–27.6 μM, while the IC50 values of 1–3 were 17.6–65.3 μM. There are no significant differences in the cytotoxicity capacities between Compounds 1, 2, and 3.