Chemical Composition and Biological Activities from Croton delpyi Croton decalvatus and Croton caudatus
Background: C. delpyi, C. decalvatus and C. caudatus are in the Euphorbiaceae family. The aerial parts; twigs, leaves and barks of these plants were used as traditional medicine such as anti-inflammatory, cytotoxicity, and antifungal properties. Objectives: The aims of this work were 1) to study the chemical composition of C. delpyi, C. decalvatus, and C. caudatus 2) to test their antibacterial, anti-HIV-1 RT, and cytotoxicity activities of crude extracts and pure compounds from these plants. Methods: Extraction, separation and purification of three plants were performed under chromatographic method. The biological activities including antibacterial, anti-HIV-1 RT and cytotoxicity assay of three plants were evaluated by the standard methods. Results: Phytochemical investigation of C. delpyi was founded a new clerodanes diterpenoids; crotondelpyitin A (1). The five known compounds, such as acetyl aleuritolic acid (2), 5-hydroxy-7,4- dimethoxyflavone (3), and pilloin (4) were founded in C. decalvatus and 3α-benzoyloxy-D:A-friedo-oleanan-27,16αlactone (5), and bergenin (6) were founded in C. caudatus. The compound 3 show the most effective antibacterial activities with MIC in range <0.16 -1.25 mg/mL, and MBC in range 0.6 - >5.0 mg/mL. The six compounds were inactive with antiHIV-1 RT. In addition, compound 4 was active for cytotoxic activities on FaDu and KKU-M213 at <4 µg/mL. Conclusion: The present study reveals that the Croton species are sources of diterpenoid-type compounds and significant guide for further research of the chemical constituents from these plants as potential medicines.