Acylated compounds are often present in herbal medicines. In this study, a diagnostic product ion‐based strategy was established to comprehensively characterize acylated compounds in Scrophulariae Radix. After untargeted data acquisition using ultra‐high performance liquid chromatography coupled with Orbitrap mass spectrometry, the data were processed by three‐stage diagnostic product ions. First, diagnostic product ions corresponding to the acyl groups (cinnamoyl, p‐coumaroyl, feruloyl, and caffeoyl) were used to search 90 compounds. Second, these compounds were divided into three categories using diagnostic product ions for phenylethanoid glycosides, iridoid glycosides, and phenylpropanoids, respectively. Last, the linkage position of the acyl group to iridoid glycosides was discriminated via the third‐stage diagnostic product ions. As a result, 90 acylated compounds were characterized, and 37 of them were reported from Scrophulariae Radix for the first time. 相似文献
The porous polymer matrix with good stability and confined microenvironment is considered as ideal support to stabilize isolated metal centers for catalysis. Herein, we report a “one-pot” method to prepare a kind of palladium complexed with azo porous organic polymer nanospheres (Pd-azo-POPs). The method combines the synthesis of azo-POPs with the reduction of the Pd ion, where azo serves as an anchoring group to limit the growth of Pd. The unique structure is conductive to the formation of a uniform active center and provides improved electron transfer. Pd-azo-POPs-80 exhibits a high catalytic activity and cycling stability both in 4-nitrophenol reduction and Suzuki-Miyaura coupling. The knor for the 4-nitrophenol reduction was 174.7 min−1 mM−1 and the conversion remains above 90% after 6 cycles. Meanwhile, the yield was still up to 94.5% after 5 cycles for the Suzuki-Miyaura coupling reaction of benzene derivatives with I/Br under mild conditions. 相似文献
Unsaturated polyester resin (UPR) is a widely applied engineering material with drawbacks of high fire risks and brittleness. In this paper, low-cost diethylene glycol (DEG) was used as one of diols to react with saturated and unsaturated anhydrides for unsaturated polyester pre-polymers. Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatograph were used for studying their structures and differential scanning calorimetry, thermogravimetric analysis (TG) for studying their thermal properties. Incorporated DEG comonomer improves limited oxygen index values of cross-linked UPR from 20 to 26% as the mole proportion of DEG increases from 0 to 50 mol% in diols. Combustion test indicates that the UPR sample with 70 mol% DEG in diols is self-extinguishing with none drop, referring to nonflammable burning grade. What is more, mechanical properties are also increased greatly by comparing with typical UPR base. Pyrolysis behaviors of UPR in nitrogen atmosphere suggest that the polyesters incorporated with DEG will produce more char and residues during the degradation process. By comparing the pyrolysis behaviors of UPR having DEG with those of UPR adding ammonium polyphosphate in TG curves, the flame-retarding mechanism of DEG incorporation is probably due to residual char forming in temperature range of 500–800 °C, which is close to the burning temperature. This study suggests that DEG element increases effectively and environmental friendly the fire safety of UPR materials.
Three novel solid phase extraction agents were developed by functionalising sub-micron sized silica gel with organic functional moieties possessing {SN}-ligating atoms. The extractors were characterised by FTIR and TGA. Their capability of adsorbing the ions Fe(III), Cu(II), Zn(II), Cd(II), Cr(VI), Hg(II), Pb(II), Co(II), Ni(II), and Ag(I) is described. The extractors show pH-tunable selectivity for Ag(I) and/or Pb(II). By adjusting the pH to 5 or 6, high affinity is found for both Ag(I) and Pb(II), with little or no interference by the other metal ions. At pH values of <2, the extractors become highly selective for Ag(I), with an adsorption capacity of 35 mg g?1. Little mechanical stirring is required due to the size of the particles. The recovery rates for both Ag(I) and Pb(II) were better 90% even after five repetitive adsorption-desorption cycles. 相似文献
