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| Author(s): |
Raquel dos Santos Donatini
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2003-10-30 |
| Examining board members: |
Elfriede Marianne Bacchi;
Lia Siguemi Sudo Hayashi;
Edna Tomiko Myiake Kato
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| Advisor: | Elfriede Marianne Bacchi |
| Abstract | |
Syzygium jambos (L.) Alston, Myrtaceae, is commonly employed in folk medicine to treat diabetes, cough and headaches. Dried leaves were morphologic and anatomically studied. Phytochemical screening of the powdered dried leaves indicates the presence of flavonoids, tannins and essential Gil. Hydroethanolic extracts (70%) were prepared by percolation and freeze-drying. The tannin content of dried leaves and extract was, respectively, 21,9% and 43,3%. The flavanoid content was 0,6% (dried leaves) and 1,2% (extract). Acute toxicity studies were performed afier oral administration of the leaf extract to mice, at a dose of 5 g/kg. The LD50 value for the extract (oral administration of five different doses) was 4,68 g/kg. The dilution method was used to determine the minimum inhibitory concentration (MIC) of S. jambos extract against Staphylococcus aureus strain ATCC 6538, Escherichia coli strain ATCC 10536, Candida albicans strain ATCC 10231, Aspergillus niger strain ATCC 16404. Hydroethanolic extract of leaves of S. jambos inhibited the growth of S. aureus (200 < MIC < 300 µg/mL), but had no activity against E. coli, A. niger and C. albicans at 1000 µg/mL. Previous oral administration of S. jambos extract (400 mg/kg) reduced significantly gastric injury induced by HCl/ethanol. In vitro antioxidant activity of S. jambos extract was evaluated by malondialdehyde (MOA) measure in a method based on the inhibition of spontaneous lipid peroxidation of brain homogenates. The Q1/2 value for the extract was 0,165µg/mL. (AU) | |