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Farjana Nikkon,M. Rowshanul Habib,M. Rezaul Karim,M. Shamim Hossain,M. Ashik Mosaddik,M. Ekramul Haque The Korean Society of Mycology 2008 Mycobiology Vol.36 No.3
The crude ethanol extracts (stem and fruits), their fractions and two triterpenes, β-Amyrin and 12-Oleanene 3β, 21β-diol, isolated as a mixture from the chloroform soluble fraction of an ethanolic extract of Duranta repens stem, were evaluated for antibacterial, antifungal activities by the disc diffusion method and cytotoxicity by brine shrimp lethality bioassay. The structures of the two compounds were confirmed by IR, 1H-NMR, 13C-NMR and LC-MS spectral data. The chloroform soluble fraction of stem and ethanol extract of fruits possess potent antishigellosis activity and also exhibited moderate activity against some pathogenic bacteria and fungi but the isolated compound 1 (mixture of β-Amyrin and 12-Oleanene 3β, 21β-diol) showed mild to moderate inhibitory activity to microbial growth. The minimum inhibitory concentrations (MICs) of the extracts (stem and fruits), their fractions and compound 1 were found to be in the range of 32~128 μg/ml. The chloroform soluble fractions of stem and ethanol extract of fruit showed significant cytotoxicity with LC50 value of 0.94 μg/ml and 0.49 μg/ml, respectively against brine shrimp larvae.
Ayesha Siddika,Tasnim Zahan,Lipy Khatun,Md. Rowshanul Habib,Md. Abdul Aziz,A. R. M. Tareq,Md. Habibur Rahman,Md. Rezaul Karim 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
This study was designed to evaluate the antioxidantactivity of methanol extract of Averrhoa carambollaLinn. leaves (MELA) using DPPH˙ and ABTS˙+ free radicalscavenging assays whereas its antineoplastic effectagainst Ehrlich ascites carcinoma (EAC) was assed usingviable cell count, life span, body weight gain and hematologicalparameters of experimental mice. Results showedthat rich phenolic and flavonoid content of MELA hadmoderate dose dependent free radical scavenging activity(IC50: 62.0 lg/mL for DPPH˙ and 6.0 lg/mL for ABTS˙+). In vivo antineoplastic assay, MELA significantly(P\0.05) decreased viable cells and body weight gain,increased the survival time and restored altered hematologicalprofiles of cancer cell bearing mice. Fluorescencemicroscopic view of EAC cells derived from MELA-treatedgroup showed apoptotic characteristics and this observationwas also supported by overexpression of proapoptoticgenes coding p53 and Bax proteins in treatedcancer cells. The anti-apoptotic genes coding Bcl-2 proteinwas also absent in treated EAC cells as compared with thecontrol. Moreover, phytochemical profiles of MELA asidentified by GC/MS analysis are also consistent with itsactivities.