2024-03-29T01:39:43Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/827072023-01-19T07:02:04Zhdl_2115_20049hdl_2115_141Phlorotannins Derived From the Brown Alga Colpomenia bullosa as Tyrosinase InhibitorsKurihara, HideyukiKujira, Kazukimetadata only accessColpomenia bullosaScytosiphonaceaephlorotanninphenolicstyrosinaseinhibitor430Tyrosinase catalyzes hydroxylation of L-tyrosine and dehydrogenation of L-DOPA in the melanin biosynthesis pathway. Tyrosinase inhibitors have potential use as cosmetic whitening agents and for preventing seafood deterioration. In this report, tyrosinase inhibitors extracted from brown alga Colfpomenia bullosa (Scytosiphonaceae, Scytosiphonales) were investigated. Inhibitory principles were isolated from the extract and identified as phlorotannins, phloroglucinol (1), diphlorethol (2), triphlorethol C (3), which have not been isolated in a free form previously, and fucophlorethol C (4). Compounds 3 and 4 have not been reported previously as tyrosinase inhibitors. Triphlorethol C (3) was the most potent tyrosinase inhibitor among the phlorotannins isolated, whereas isomeric fucophlorethol C (4) displayed the weakest inhibitory activity. The results suggest that molecular structures of phlorotannins strongly affect their tyrosinase inhibitory activity.SAGE Publications2021-07engjournal articleNAhttp://hdl.handle.net/2115/82707https://doi.org/10.1177/1934578X2110213171934-578XNatural product communications167