Abstract A summarized physicochemical profile of nine multifloral honeys produced by Apis cerana cerana Fabricius in Qiongzhong region located in Hainan province was exhibited, regarding pH (3.72-4.02), moisture (19.20-22.53%), fructose (34.40-38.70 g 100 g-1), glucose (31.60-35.05 g 100 g-1), sucrose (less than 3%), color (31.00-80.00 mm Pfund), ash content (0.17-0.45 g 100 g-1), soluble solid (75.87-79.10 ◦Brix), and electrical conductivity (343.67-678.33 μS cm-1). Potassium showed the highest concentration, followed by calcium. Manganese, boron, iron, aluminium, and zinc were the main micro-elements while cadmium and hydrargyrum were not detected in all honey samples. The antiradical activity was shown to be significantly negative correlated with total phenolic content (TPC) (r2 = −0.756) and total flavonoid content (TFC) (r2 = −0.477). Among all tested honey samples, sample A exhibited the highest levels of TPC (45.46 mg GAE 100 g-1), TFC (10.02 mg RE 100 g-1), and antiradical activity (DPPH IC50 = 2.63 mg mL-1). Our results will be useful in determining to set the standard for A. cerana cerana honey.

The IR spectrum, crystal structure, electronic structure, thermodynamic properties, heat of formation and detonation properties of a new polynitro heterocyclic energetic material 3,7-bis(dinitromethylene)-2,4,6,8-tetranitro-2,4,6,8-tetraazabicyclo[3.3.0]octane were investigated theoretically. The calculated results show that this compound has a centrosymmetric structure and the molecular packing prediction indicates that the crystalline packing of the title compound is P212121 and the corresponding cell parameters are as follows: Z=4, a= 22.03 Å, b=8.73 Å, c=8.42 Å, Ꮁ=90°, β=90° and γ=90°. Based on the high positive heat of formation (HOF, 740.4 kJ mol-1), excellent detonation properties (detonation velocity D, 9.77 km s−1; detonation pressure P, 45.9 GPa), energy gap (ΔELUMO-HOMO) 4.19 eV and the molecular electrostatic potentials (MEP), it is predicted that 3,7-bis(dinitromethylene)-2,4,6,8-tetranitro-2,4,6,8-tetraazabicyclo[3.3.0] octane could be may be a superior high-energy density compound (HEDC) to RDX and HMX.