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).
Keywords: Juglandaceae; Juglans sigillata; anti-inflammatory; radical scavenging activities; triterpenoids.