Isolation, fractionation and identification of chemical constituents from the leaves crude extracts of Mentha piperita L grown in Sultanate of Oman

<p><b>OBJECTIVE</b>To analyze and identify the chemical compositions of different organic plants crude extracts of Mentha piperita (M. piperita) grown in Sultanate of Oman by gas chromatography-mass spectrometry (GC-MS).</p><p><b>METHODS</b>The powder sample was extracted with methanol by using Soxhlet extractor. Methanol crude extracts of M. piperita and its derived fractions of hexane, chloroform, ethyl acetate and butanol were prepared.</p><p><b>RESULTS</b>Qualitative analyses of various organic plant crude extracts of M. piperita by using GC-MS showed that majority of these compounds are bioactive.</p><p><b>CONCLUSIONS</b>According to the results of the present study, the plant crude extracts could be used as medicine for the treatment of different diseases. The analysis and identification of the chemical compounds in the plant crude extracts by using GC-MS was the first time.</p>

Gas chromatography-mass spectrometry analysis of different organic crude extracts from the local medicinal plant of Thymus vulgaris L

<p><b>OBJECTIVE</b>To isolate and analyze the chemical composition in different crude extracts of from the leaves of locally grown of Thymus vulgaris L (T. vulgaris) by gas chromatography-mass spectrometry (GC-MS).</p><p><b>METHODS</b>The shade dried leaves powder was extracted with methanol by using Soxhlet extractor. Methanol crude extracts of T. vulgaris and the derived fractions of hexane, chloroform, ethyl acetate and butanol were obtained.</p><p><b>RESULTS</b>Qualitative analyses of various organic crude extracts of T. vulgaris by using GC-MS showed that there were different types of high and low molecular weight compounds. Most of the isolated and identified compounds by GC-MS in the crude extracts are basically biologically important. Further, the T. vulgaris leaf possessed certain characteristics that can be ascribed to cultivation on a domestic plantation. The crude extracts were prepared from the powder leaves of T. vulgaris for respective compounds can be chosen on the basis of above GC-MS analysis.</p><p><b>CONCLUSIONS</b>All the major compounds were identified and characterized by spectroscopic method in different organic crude extracts of T. vulgaris are biologically active molecules. Thus the identification of a good number of compounds in various crude extracts of T. vulgaris might have some ecological role.</p>

Chemical composition of essential oils and in vitro antioxidant activity of fresh and dry leaves crude extracts of medicinal plant of Lactuca Sativa L. native to Sultanate of Oman

<p><b>OBJECTIVE</b>To isolate and analyse the chemical composition in the essential oils and free radical scavenging activity of different crude extracts from the fresh and dry leaves of vegetable plants of Lactuca sativa L. (L. sativa).</p><p><b>METHODS</b>The essential oils and volatile chemical constituents were isolated from the fresh and dry leaves of L. sativa (lettuce) grown in Sultanate of Oman by hydro distillation method. The antioxidant activity of the crude extracts was carried out by well established free radical scavenging activity (DPPH) method.</p><p><b>RESULTS</b>About 20 chemical compounds of different concentration representing 83.07% and 79.88% respectively were isolated and identified by gas chromatography-mass spectroscopy in the essential oils isolated from the fresh and dry leaves as α-pinene (5.11% and 4.05%), γ-cymene (2.07% and 1.92%), thymol (11.55% and 10.73%), durenol (52.00% and 49.79%), α-terpinene (1.66% and 1.34%), thymol acetate (0.99% and 0.67%), caryophyllene (2.11% and 1.98%), spathulenol (3.09% and 2.98%), camphene (4.11% and 3.65%), limonene (1.28% and 1.11%) representing these major chemical compounds. However, some other minor chemical constituents were also isolated and identified from the essential oil of lettuce including β-pinene, α-terpinolene, linalool, 4-terpineol, α-terpineol, o-methylthymol, L-alloaromadendrene and viridiflorene.</p><p><b>CONCLUSIONS</b>The chemical constituents in the essential oils from the locally grown lettuce were identified in the following classes or groups of chemical compounds such as monoterpenes, sesquiterpenes volatile organic compounds and their oxygenated hydrocarbons. Therefore, the essential oils and the crude extracts from Omani vegetable species of lettuce are active candidates which would be used as antioxidant, antifungal or antimicrobial agents in new drugs preparation for therapy of infectious diseases.</p>

Statin associated hepatic adverse effects: a retrospective review from a regional hospital in sultanate of Oman

This study aimed to evaluate the prevalence, pattern and predisposing factors for hepatic adverse effects with statins in a regional hospital in Sultanate of Oman. A retrospective review of the patient files in Department of Medicine during the year 2011 was done to evaluate any hepatic dysfunction possibly related to statins among the patients. For each case of suspected statin induced hepatic effect, additional details on temporal relationship, pattern of presentation, management, final outcome and any contributing factors were obtained. Difference in the occurrence of hepatic effects based on the patient demographics and drug characteristics was additionally evaluated. A total of 927 patients meeting the inclusion criteria were included for the study. Mean age of the evaluated patients was 63.1 + 11.37 and median duration of use of statin in months was 22 [IQR, 43.25]. In 40 [4%] of the 927 patients, there was presence of a hepatic effect considered to be statin related and only in 12 [1%] patients a significant transaminase rise [>3 times] was observed. Median duration of use of statin among those patients who developed suspected statin induced hepatic effects and those who did not was 45 [IQR,52] and 21 [IQR, 43] months, respectively and the difference observed was statistically significant. A significant difference in the prevalence of hepatic effects was observed only based on the duration of statin use. There was an infrequent occurrence of significant hepatic effects associated with statins in the study population. Our results support the latest recommendations including from United States Federal Drug Administration [US PDA] that statins appear to be associated with a very low risk of serious liver injury and that routine periodic monitoring of transaminases does not appear to detect or prevent serious liver injury in association with statins use