Arbutin is a tyrosinase inhibitor with an IC50 of 1.09 mM, which has gastroprotective, whitening, anti- age, anti-oxidant , anti-inflammatory, a depigmenting effects and UVB/ UVC filter. Arbutin has mutagenicity in mammalian cells after activation by human intestinal bacteria.
Oxyresveratrol , a dietary phenolic compound, has neuroprotective effect, as a potential nutritional candidate for protection against neurodegeneration in Parkinson disease; Oxyresveratrol has antioxidant activity, can reduce neuronal oxidative damage and protect hepatocytes against oxidative stress and mitochondrial dysfunction, which may be associated with activation of Nrf2, it also as an antibrowning agent for cloudy apple juices and fresh-cut apples. Oxyresveratrol exhibits a potent inhibitory effect on dopa oxidase activity of tyrosinase which catalyzes rate-limiting steps of melanin biosynthesis.Oxyresveratrol exhibits the inhibitory activity at the early and late phase of viral replication and inhibited the viral replication with pretreatment in one-step growth assay of HSV-1 and HSV-2.
1. Taxoquinone shows significant and concentration-dependent antioxidant and free radical scavenging activities of DPPH, nitric oxide, superoxide and hydroxyl free radicals by 78.83%, 72.42%, 72.99% and 85.04%, as compared to standard compounds ascorbic acid (81.69%, 74.62%, 73% and 73.79%).
2. Taxoquinone at the concentration range of 100-3,000 ug/mL and 200-1,000 ug/mL shows potent efficacy on inhibiting α-glucosidase and tyrosinase enzymes by 9.24-51.32% and 11.14-52.32%, respectively; suggests that taxoquinone could as a novel candidate in food and medicine industry as a natural alternative medicine to prevent diabetes mellitus type-2 related disorders and as a depigmentation agent.
3. Taxoquinone (100 ug/disc) displays potential anticandidal effect against Candia albicans.
4. Taxoquinone has strong antibacterial effect, it could be used as a promising antibacterial agent in food industry to inhibit the growth of certain important foodborne pathogens.