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|Title: ||Antibacterial and antioxidant cassane diterpenoids from Caesalpinia benthamiana'Y|
|Authors: ||Dickson, Rita A.|
Houghton, Peter J.
Hylands, Peter J.
|Issue Date: ||Apr-2007|
|Citation: ||Phytochemistry 68 (2007) 1436-1441|
|Abstract: ||Bioactivity-guided fractionation of the light petroleum extract of Caesalpinia benthamiana (=Mezoneuron benthamianum) root bark has led to the isolation of two cassane diterpenoids, designated as benthaminin 1 and 2. A third compound, a deoxy form of caesaldekarin C (also referred to as methyl vouacapenate) which has previously been isolated from Caesalpinia major, C. bonducella, Vouacapoua americana and V. macropetala, was also isolated, together with β-sitosterol and stigmastenone. The antibacterial and antioxidant activities of these cassane diterpenoids have been assessed using the microdilution assay method and DPPH spectrophotometric and TBA lipid peroxidation assays. Benthaminin 1 was the more active antibacterial compound with MIC values of 47.8 μM for both Staphylococcus aureus and Micrococcus flavus. Benthaminin 2 was the more active antioxidant compound and showed IC50 values of 42.7 μM and 74.2 μM for the DPPH and TBA assays, respectively. Deoxycaesaldekarin C possessed both antibacterial and antioxidant activities. The presence of methyl ester and methyl functional groups as well as an unsaturated furan ring appears to confer antibacterial activity. On the other hand, the relatively stronger antioxidant activity of benthaminin 2 may be associated with the presence of an exocyclic methylene function.|
|Description: ||This article is published in Phytochemistry and also available at https://doi.org/10.1016/j.phytochem.2007.03.008|
|Appears in Collections:||College of Health Sciences|
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