Cyclic voltammetry, as well as four well-established spectrophotometric and fluorimetric assays, were applied to study the contribution of phenolic compounds to the antioxidant capacity of aqueous and methanol extracts of Jiaogulan tea (Gynostemma pentaphyllum). In addition, individual phenolic ...

Gynostemma pentaphyllum (Thunb.) Makino was traditionally used as antiatherogenic foods in China but ingredients responsible for the effects remained unexplored. Here, kaempferol 3-O-[2G-(E)-Coumaroyl-3G-O-β-D-glucosyl-3R-O-β-D-glucosylrutinoside] (KCGG), gypenoside XLVI (GPXLVI), gypenoside L...

To search for potential candidate anti-AD agents, the gypenosideson the aerial parts of Gynostemma pentaphyllum were phytochemically investigated, yielding two undescribed (1-2) and five known (3-7) dammarane saponins. Their molecular structures were unambiguously elucidated via spectroscopic an...

In current study, a polysaccharide (GPP) was successfully extracted from Gynostemma pentaphyllum herb. Monosaccharide composition of GPP was rhamnose, arabinose, galactose, glucose, xylose, mannose, galacturonic acid and glucuronic acid in a molar ratio of 4.11: 7.34: 13.31: 20.99: 1.07: 0.91: 4...

Copper oxide (CuO) nanoparticles were successfully deposited on carbon nanotubes’ (CNTs) surface via complex-precipitation method, the nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray pow...

The catalytic proficiency of three MONs for AP thermal decomposition was studied in this work. A chemical co-precipitation method was used for synthesis of MONs (CuZnO, CoZnO, and NiZnO) and their characterization carried out by utilizing XRD, FTIR, and SEM. The TGA/DSC technique was employed fo...

Bistetrazole energetic supramolecular complex, [Er2(BTO)3(H2O)8]n [H2BTO = 5,5′-bistetrazole-1,1′-diolate], was synthesized by hydrothermal method. Its structure was characterized by single crystal X-ray, infrared spectroscopy and elemental analysis. Thermal stability was determined by differe...

Simplified model propellant configurations, such as monomodal propellants, can be valuable in the development and validation of predictive numerical tools. These idealized experiments also yield insight into the effect of diffusion length scales on combustion, but comprehensive data covering a l...

In this paper, the ultrafine Fe-O compound/ammonium perchlorate (AP) nanocomposites were prepared via in-suit growth method. The structure and morphology of the nanocomposites were characterized by infrared spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion X...

Burn rate enhancement of a composite solid propellant, AP–NC (Ammonium Perchlorate–Nitrocellulose) was demonstrated experimentally by coupling to 3-D, highly conductive, interconnected, porous and CuO-functionalized GF (graphene foam) micro-structures. The pure GF micro-structures were first s...

Simultaneous improvement of the safety performance and thermal decomposition properties of ammonium perchlorate (AP) remains a significant challenge. Therefore, based on inspiration from biological materials, we have prepared a novel copper alginate/ammonium perchlorate (Cu-alginate/AP) composit...

In this work, ternary transition metal oxides MnCo2O4.5 nanosheets was anchored on reduced graphene oxide (RGO/MnCo2O4.5 NSs) in an in-situ way for catalyzing ammonium perchlorate (AP). XRD, FT-IR, Raman, EDX, XPS, SEM, TEM, HR-TEM, SAED and nitrogen absorption-desorption techniques were applied...

An excellent material for thermal decomposition of ammonium perchlorate (AP) is urgently required. Herein, inspired by natural biopolymer, we prepared CoMn–alginate/AP composite by air atomization method. The results clearly indicated that the bimetallic CoMn–alginate had a 3D network structur...

The solubility in the three-component systems Rb2SeO4–MSeO4–H2O (M = Mg, Ni, Cu) is studied at 25 °C by the method of isothermal decrease of supersaturation. It has been established that double compounds, Rb2M(SeO4)2·6H2O (M = Mg, Ni, Cu), crystallize from the ternary solutions within wide c...

In this paper we report the crystal and molecular structure of the title compound, (NH4)2Be(SO4)2·2H2O, as determined by single-crystal X-ray diffraction and vibrational spectroscopy data.(NH4)2Be(SO4)2·2H2O crystallizes in the monoclinic space group P21/c (a = 11.448(2), b = 11.876(2), c = 7....

The determination of the crystalline structure of rubidium phosphate tellurate Rb2HPO4RbH2PO4·Te(OH)6 [RbPTe] is performed from single crystal X-ray diffraction data. The title compound crystallizes in the monoclinic system P2. The unit cell parameters are as follows: a = 7.9500(7) Å, b = 6.308...

The identification of microbial activity under extreme conditions is important to define potential boundaries of the habitable and uninhabitable zones of terrestrial and extraterrestrial living forms. The subseafloor regimes of serpentinite seamounts in the Mariana Forearc are among the most ext...

This work presents some electrical properties based on the impedance measurements as well as the dielectric constants and electric modulus. In order to through light in the electrical conductivity and dielectric properties of Rb2HAsO4Te(OH)6 (Rb As Te), we have carried out complex impedance spec...

The new mixed compound Tl1.90Rb0.10(SO4)0.92(SeO4)0.08Te(OH)6 (TlRbSSeTe) has been synthesized in order to determine the temperature transitions and to specify the electrical properties as well as the conduction mechanism. It is obtained by slow evaporation at room temperature and prove to cryst...

Cs0.1Rb0.9HSO4 has Mr = 187.2 is monoclinic and belongs to space group P21/c, with a = 14.444 Å, b = 4.618 Å, c = 14.877 Å, β = 121.20°, V = 848.8 Å3, Z = 8, Dx = 2.918 g Cm−3, λ(MoKα) = 0.710 73 Å, μ(MoKα) = 114.31 mm−1, F(000) = 718, T = 298 K (room temperature phase), R = 0.057 and...