Molecules, Vol. 29, Pages 341: Novel Dihydrocoumarins Induced by Radiolysis as Potent Tyrosinase Inhibitors

Molecules, Vol. 29, Pages 341: Novel Dihydrocoumarins Induced by Radiolysis as Potent Tyrosinase Inhibitors
Molecules doi: 10.3390/molecules29020341
Authors:
Gyeong Han Jeong
Manisha Yadav
Seung Sik Lee
Byung Yeoup Chung
Jae-Hyeon Cho
In-Chul Lee
Hyoung-Woo Bai
Tae Hoon Kim

A representative naturally occurring coumarin, 4-methylumbelliferone (5), was exposed to 50 kGy of gamma ray, resulting in four newly generated dihydrocoumarin products 1–4 induced by the gamma irradiation. The structures of these new products were elucidated by interpretation of spectroscopic data (NMR, MS, [α]D, and UV). The unusual bisdihydrocoumarin 4 exhibited improved tyrosinase inhibitory capacity toward mushroom tyrosinase with IC50 values of 19.8 ± 0.5 μM as compared to the original 4-methylumbelliferone (5). A kinetic analysis also exhibited that the potent metabolite 4 had non-competitive modes of action. Linkage of the hydroxymethyl group in the C-3 and C-4 positions on the lactone ring probably enhances the tyrosinase inhibitory effect of 4-methylumbelliferone (5). Thus, the novel coumarin analog 4 is an interesting new class of tyrosinase inhibitory candidates that requires further examination.

Source: Molecules - January 10, 2024 Category: Chemistry Authors: Gyeong Han Jeong Manisha Yadav Seung Sik Lee Byung Yeoup Chung Jae-Hyeon Cho In-Chul Lee Hyoung-Woo Bai Tae Hoon Kim Tags: Article Source Type: research