Pterostilbene

Pterostilbene is a stilbenoid isolated from blueberries and Pterocarpus marsupium^[1]. Shows anti-oxidant, anti-inflammatory, anti-carcinogenic, anti-diabetic and anti-obesity properties^[1][4]. Pterostilbene blocks ROS production^[3], also exhibits inhibitory activity against various free radicals such as DPPH, ABTS, hydroxyl, superoxide and hydrogen peroxide^[4]. In Vitro: Pterostilbene (0, 5, 25, 50, 100, 200 and 400 μM) shows inhibitory activity against the growth of HeLa cells, with IC₅₀s of 101.2 μM and 65.9 μM at 24 and 48 hrs, respectively. Ipterostilbene (0, 25, 100 and 200 μM) also induces the apoptosis HeLa cells^[2].
Pterostilbene (0.05, 0.1, 0.15 and 0.2 mM) has high anti-oxidant activity against DPPH, ABTS, hydroxyl, superoxide, hydrogen peroxide in a dose-dependent manner. Pterostilbene decreases lipid peroxides and hydroperoxides, reduces protein carbonyl groups and restores protein sulphydryl groups in response to damage by TBHP and As-Fe²⁺. Pterostilbene also inhibits single strand breaks in pBR322^[4]. In Vivo: Pterostilbene (30 mg/kg daily, p.o. for 21 days) inhibits reactive oxygen species production in the animal model of inflammation^[3].