NEW SAPONINS FROM ALBIZIA LEBBECK (L) BENTH FLOWERSAbstract
Two new oleanane triterpene type saponins named lebbeckanin I (1) and lebbeckanin II (2), in addition to a new isomer of methyl inositol, D-1-O-methyl-cis-inositol (3), were isolated from butanol fraction of Albizia lebbeck (L.) Benth flowers. Their structures were established on the basis of spectroscopic analysis including MS, 1H & 13C NMR, 1H-1H COSY, HSQC & HMBC. The fraction containing mixture of compounds 1 and 2 exhibited significant cytotoxic activity against HePG-2 (Hepatocarcinoma), HEP-2 (Larynx carcinoma), HELA (Cervical carcinoma), MCF-7 (Breast carcinoma) and HCT-116 (Colon carcinoma) cell lines with LD50 values of 1.74, 3.42, 4.29, 0.65 and 0.74 µg respectively. In addition, the antimicrobial screening of the same fraction was evaluated and showed variable degrees of activity against all the tested organisms. It is notable that the same fraction showed antifungal activity against Syncephalastrum racemosum (RCBM 05922) stronger than that exhibited by Amphotericin B.
Afaf E. Abdel Ghani, Gamal A. Dora, Wafaa H. B. Hassan*, Rehab H. Abdallah and E. Abd El-Salam
Department of Pharmacognosy, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
03 April, 2016
21 May, 2016
13 June, 2016
01 September 2016