Triterpenoids from Juglans sigillata and their anti-inflammatory and radical scavenging activity.

A phytochemical investigation on 90% methanol extract from the leaves of Juglans sigillata led to the isolation of three new triterpenoids, jugsigiloids A-C (1-3). Structural elucidation of all the compounds were performed by spectral methods such as 1 D and 2 D (1H-1H COSY, HMQC, and HMBC) NMR spectroscopy, in addition to high resolution mass spectrometry. The isolated components were evaluated in vitro for anti-inflammatory activities against COX-1 and COX-2 and radical scavenging potential using DPPH test. As a result, triterpenoid 1 exhibited selective inhibition on COX-2 (93.2%) at the concentration of 100 µM and significant DPPH scavenging activity (IC50 = 41.6 µM) comparable with positive control Trolox (IC50 = 42.8 µM).

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials.

It is vital to improve the electrochemical performance of negative materials for energy storage devices. The synergistic effect between the composites can improve the total performance. In this work, we prepare α-Fe2O3@MnO2 on carbon cloth through hydrothermal strategies and subsequent electrochemical deposition. The α-Fe2O3@MnO2 hybrid structure benefits electron transfer efficiency and avoids the rapid decay of capacitance caused by volume expansion. The specific capacitance of the as-obtained product is 615 mF cm-2 at 2 mA cm-2. Moreover, a flexible supercapacitor presents an energy density of 0.102 mWh cm-3 at 4.2 W cm-2. Bending tests of the device at different angles show excellent mechanical flexibility.