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- W2607134204 abstract "Background: Silybum marianum (L.) Gaertn (Milk thistle) is a medicinal herb fraught with flavonolignans known as silymarin. Methods: We investigated and compared in vitro effects of commercial silibinin (mixture of two diastereomers, silybin A and silybin B) and milk thistle flavonolignans on the kinetic parameters and activities of aldehyde oxidase (AO) and xanthine oxidase (XO) of rat liver. Samples of milk thistle seeds were collected from different locations in Iran and their silymarin extract (contained silibinin flavonolignans) were extracted and quantified. Partially purified hepatic AO and XO were prepared from liver homogenates of rats. AO and XO activities were spectrophotometrically determined in the presence of silibinin (10, 50 and 100 µM) and silymarin extracts (10, 50 and 100 μg/ml) using phenanthridine and xanthine as substrates, respectively. Silymarin extract (100 μg/ml) and silibinin (100 µM) were able to inhibit the rat hepatic XO activities by 65 ± 4 and 70 ± 1%, respectively. Furthermore, the AO activity was reduced to 62 ± 1 and 70 ± 3% in the presence of silymarin extracts and silibinin, respectively. Results and Conclusion: Kinetic studies indicated that AO is inhibited by silibinin in an uncompetitive manner, whereas this flavonolignan was found as a mixed inhibitor of the XO activity. However, compared to the menadione (an AO inhibitor) and allopurinol (the XO inhibitor), silibinin and silymarin extracts had a lower inhibitory effect. Keywords: Silibinin, flavonolignans, aldehyde oxidase (AO), xanthine oxidase (XO), enzyme kinetics, milk thistle." @default.
- W2607134204 created "2017-04-28" @default.
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- W2607134204 date "2018-01-31" @default.
- W2607134204 modified "2023-09-27" @default.
- W2607134204 title "Inhibitory Effects of Flavonolignans from Silybum marianum (L.) Gaertn (Milk Thistle) on Function of Aldehyde Oxidase and Xanthine Oxidase in Rats" @default.
- W2607134204 doi "https://doi.org/10.2174/1570180814666170420110005" @default.
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