The essential oil from the leaves of Cassia arrereh Del. and Ficus thoningii Blume were analyzed using GC-MS. Eight compounds representing 100% of the essential oil from the leaves of Cassia arrereh Del, were characterized, with the major constituents as 10-methyl- Eicosane 32.50%, 2, 6, 10, 15-tetramethyl- Heptadecane 31.34 %, (R)-(-)-(2)-14-Methyl-8-hexadecen- 1-ol 12.73%. While ten compounds representing 99.99% of the essential oil from the leaves of Ficus thoningii Blume were characterized, with the major constituents as 2, 6,10, 15-tetramethyl- Heptadecane, 42.42 %, 9-methyl- Nonadecane,17.62%, Eicosane 16.17 %, , and methylsalicylate 10.58%. Although Cassia arrereh Del. and Ficus thoningii Blume belong to different families of Caleaslpiniaceae and Monaveae respectively, they both contained methylsalicylate and 2, 6,10, 15-tetramethyl- Heptadecane, 42.42 % in different proportions.
In this paper, the antioxidant activities of black and white pepper (Piper nigrum L.) essential oils (BEO and WEO) were evaluated and compared based on radical scavenging activities, reducing power, and DNA oxidative damage protection assays. The results showed that EOS exhibited antioxidant activities, and DNA damage protective effect to various extents. For BEO and WEO, they showed a concentration-dependent antioxidant activity at some concentrations. On the whole, WEO exhibited higher antioxidant activity than BEO. These results suggest that the essential oil of white pepper and black pepper may be a new potential source as a natural antioxidant.
ESSENTIAL OIL EUGENIA ASTRINGENS CAMBESS. QUANTITATIVE ANALYSIS AND POTENTIAL ASSESSMENT ANTIMICROBIAL, CYTOTOXIC AND GENOTOXIC. (Published)
The essential oil from the leaves of Eugenia astringens Cambess (OE-2) was obtained by hydrodistillation in a Clevenger apparatus modified. The essential oil chemical composition (0.17% yield) was analyzed in GC-MS. The main component in the leaves was the α – pinene. The result of the quantification of the OE-2 sample, the calibration curve showed that the percentage of α-pinene in the essential oil is 2.5% ± 3.9. Cytotoxic potential of the essential oil of Eugenia astringens Cambess was assessed by indirect diffusion in agarose gel in a strain of Staphylococcus aureus. The essential oil obtained in vitro antibacterial activity relevant for high dosage (25 µL). It has been found that the use of essential oil (12.5mL) along with the antibiotic (amoxicillin, 12,5 µL volume) did not potentiate the drug action, this remains invariable. The linearity of the calibration curve was proven in the evaluated concentration range, but through the linear model obtained by Ordinary Least Squares Method.
Testing for NDVRL Using Nonparametric Kernel Method (Review Completed - Accepted)
Using the nonparametric “kernel methods” of curve fitting, a new approach is
taken for testing exponentiality versus net decreasing variance residual lifetime
(NDVRL). The test is proposed for complete and censored data. The Pitman’s asymptotic
relative efficiency to test for other classes is discussed. Selected critical values are
tabulated. Some numerical simulations on the power estimates are presented for the
proposed test. Numerical examples are presented for illustrative our test purpose