Antioxidant and tyrosinase inhibitory activities of methanol extracts from Magnolia denudata and Magnolia denudata var. purpurascens flowers

Antioxidant and Tyrosinase Inhibitory Properties of Aqueous Ethanol Extracts from Monofloral Bee Pollen

“…The tyrosinase inhibitory activities of pollen extracts were measured according to the spectrophotometric method (Jo et al, 2012) with minor modifi cations. A redissolved extracting solution (0.1mL, 25 mg/ mL) was mixed with 1.8mL PBS (0.1 M, pH 6.8) and then added to 1 mL L-tyrosine or L-dopa (0.03%).…”

Phenolic content and antioxidant activity of cactus (Opuntia ficus-indica L.) flowers are modified according to the extraction method

“…Flowers from different plants' have wide medicinal properties and they are recognized as having antioxidant potentialities (Guimarães et al, 2013;Jo et al, 2012;Li et al, 2014;Onanong et al, 2011;Shyu et al, 2009). Nevertheless, literature reports few data regarding phytochemicals and antioxidant activities of Opuntia flower.…”

Tyrosinase inhibitory potential of purpurin in Rubia cordifolia—A bioactivity guided approach

“…From LB plot, it was found that purpurin and F4 showed competitive inhibition on monophenolase activity of tyrosinase. This activity was compared with well-known monophenolase inhibitor ascorbic acid (Jo et al, 2012). Ascorbic acid cause's chemical reduction of dopaquinone, and reduces o-dopaquinone to l-DOPA, thus avoiding the formation of dopachrome and melanin (Chang, 2009).…”

“…Assay process was carried out in triplicate. Kojic acid and ascorbic acid were used as a positive control (Jo et al, 2012). The tyrosinase activity was calculated as follows:…”