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Silychristin: Skeletal Alterations and Biological Activities

Silychristin: Skeletal Alterations and Biological Activities

David Biedermann, Martin Buchta, Veronika Holečková, David Sedlák, Kateřina Valentová, Josef Cvačka, Lucie Bednárová, Alena Křenková, Marek Kuzma, Ctibor Škuta, Žaneta Peikerová, Petr Bartůněk, Vladimír Křen

J Nat Prod. 2016 Dec 23;79(12):3086-3092.

PMID: 28006905

Abstract:

Silychristin is the second most abundant flavonolignan (after silybin) present in the fruits of Silybum marianum. A group of compounds containing silychristin (3) and its derivatives such as 2,3-dehydrosilychristin (4), 2,3-dehydroanhydrosilychristin (5), anhydrosilychristin (6), silyhermin (7), and isosilychristin (8) were studied. Physicochemical data of these compounds acquired at high resolution were compared. The absolute configuration of silyhermin (7) was proposed to be identical to silychristin A (3a) in ring D (10R,11S). The preparation of 2,3-dehydrosilychristin (4) was optimized. The Folin-Ciocalteau reduction and DPPH and ABTS radical scavenging assays revealed silychristin and its analogues to be powerful antioxidants, which were found to be more potent than silybin and 2,3-dehydrosilybin. Compounds 4-6 exhibited inhibition of microsomal lipoperoxidation (IC50 4-6 μM). Moreover, compounds 4-8 were found to be almost noncytotoxic for 10 human cell lines of different histogenetic origins. On the basis of these results, compounds 3-6 are likely responsible for most of the antioxidant properties of silymarin attributed traditionally to silybin (silibinin).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP33889699-A	Silychristin		33889-69-9	Price

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