• Korean Journal of Pharmacognosy
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• v.52 no.2
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• pp.99-104
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• 2021

This study was performed to elucidated the inhibitory effects of 6,8-diprenylorobol on melanin synthesis by measuring the levels of cell viability, mRNA expression, tyrosinase activity, and melanin production in the B16F10 cell line. The effects of 6,8-diprenylorobol on tyrosinase-related protein 1 (TYRP1), TYRP2, tyrosinase (TYR), and microphthalmia-associated transcription factor (MITF) mRNA expression levels and melanin content were determined. Quantitative real-time RT-PCR shows that 6,8-diprenylorobol decreases the mRNA expression levels of TYRP1, TYRP2, TYR, and MITF in B16F10 cell line, resulting in lower levels of melanin production compared to α-MSH-treated B16F10 cells. Tyrosinase activity assays reveal that 6,8-diprenylorobol decreases melanin production in B16F10 cells. These results demonstrate the whitening effects of 6,8-diprenylorobol on B16F10 cells; thus, 6,8-diprenylorobol is a potent ingredient for skin whitening. Further research is needed on the mechanism of action of 6,8-diprenylorobol. Such research will benefit not only cosmetics, but also the health food and medical industries.

• Natural Product Sciences
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• v.17 no.3
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• pp.206-211
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• 2011

High-performance liquid chromatography coupled to an online $ABTS^+$-based assay (online HPLC-$ABTS^+$) system was used to determine the principal antioxidants in Cudrania tricuspidata fruits. Six prenylated isoflavonoids (1 - 6) were isolated from C. tricuspidata fruits according to the online HPLC-$ABTS^+$ system. The structures of isolated compounds, alpiniumisoflavone (1), 6,8-diprenylorobol (2), 6,8-diprenylgenistein (3), pomiferin (4), 4'-methylalpiniumisoflavone (5), and osajin (6) were identified by their retention time, UV spectra, ESI-MS, and NMR data. Among these compounds, 6,8-diprenylorobol (2) and pomiferin (4) reduced A2E photooxidation in a dose dependent manner.