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Register a new userCharacterization of trisubstituted aromatic isomers and structural identification by spectroscopic methods. I- Identification using GC-MS
تشخيص المتماكبات الأروماتية و تحديد البنية بالطرائق المطيافية الجزء الأول: التشخيص باستعمال مطياف كتلة مربوط بكروماتوغرافيا غازية GC-MS
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درست أطياف الكتلة (MS) لخمسة مركبات مرجعية أروماتية ثلاثية التبادل مسجلة محلياً باستعمال تقانة GC-MS عند طاقة 70 إلكترون فولت. و قورنت بأطياف المركبات نفسها مستقاة من المراجع. تضمنت الدراسة بيانات رقمية بينت عدم تطابق طيف كل مركب من هذه المركبات. و اقترحت الدراسة بعض متطلبات استعمال GC MS في عمليات التشخيص البنيوي، و تسجيل طيف المركب المرجعي بالشروط نفسها.
The mass spectra of 5 trisubstituted aromatic compounds were studied. The spectra were recorded by local GC-MS at 70 eV and compared with bibliographic spectra. The spectra of each compound were different. The using of local GC-MS for identification required recording the spectra references at the same conditions.
References used
J. H., Beynon, 1960. Mass Spectrometry and its Application to Organic Chemistry, Elsevier
M. St.C. Flett, 1962. Physical aids to the Organic Chemist, Elsevier. Amsterdam
James cason, 1966. Principles of modern organic chemistry, Prentice-Hall, Inc. Enlewood cliffs, New Jersey
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Neem (Azadirachta indica A. Juss.) is an important tree species that is known to posses anthelmintic, contraceptive, antimicrobial, antidiabetic and sedative properties. Therefore, the present study aimed to identify various compounds present in the
leaf extract of neem and to enlist various biological activities of these compounds through literature survey. Methodology: Extract of neem was obtained by soaking 100 g dry powdered leaves in 1000 mL methanol followed by filtration. This was successively fractioned using n-hexane and chloroform. Results: GC-MS analysis of the chloroform fraction was performed and 7 compounds namely 2-pentanol, acetate (9.72%); decane (8.96%); 11-oxa-dispiro[4.0.4.1]undecan-1-ol (6.56%); nonanoic acid, 9-(3-hexenylidenecyclopropylidene)-, 2-hydroxy-1-(hydroxymethyl)ethyl ester, (Z,Z,Z)- (7.13%); quinoline-4-carboxamide, 2-phenyl-N-n-octyl- (9.79%); nonacosane (44.27%) and tetratriacontane (13.43%) were identified. Conclusion: Literature survey showed that the identified compounds possessed antibacterial, antifungal, anticancer, cytotoxic, anti-inflammatory, antioxidant, and antiviral properties.
The extracted oil from Gundelia Tournefortii seeds, which belongs to Asteraceae
family and which is known as one of the medical herbal plants that is widely spread in the
Syrian environment, was isolated using soxhlet continuous extraction. It's ch
emical
composition was determined by GC/MS (Gas Chromatography – Mass Spectrometry). The
analysis led to identification of 20 components. The extracted oil was characterized by
high content of Linoleic Acid (52.9%), Palmitic Acid (20.1%) and Squalene (10.1%).
Due to the economical and medical importance of the Capparisspinosa plant and the
wide distribution of this plant in the Syria environment, it was thought that a study of the
composition of Essential Oil extracted from this plant.
The Capparisspin
osa Essential Oil was extracted and purified components wher
studied by GC-Mass spectrometry.
The Oil was obtained by steam distillation (Clevegerexractor) and by solvent n-
Hexane. Components have been found which was about (98.9 %) from the total of
essential oil.
The major components were determined by steam distillation which were the
following:Palmitic acid (21.12%), Hexatriacontane (15.87%), n-Heneicosane (10.96%),
Pentatriacontane (9.92%), Hexahydrofarnesyl acetone (8.51%).
The major components were determined by solvent Hexane: Isobornyl acrylate
(66.89%), 2-Azido-2,3,3-trimethylbutane (6.09%), Ethanolamine (5.41%).
Samples of surface sediment of St. Johns River Basin were collected,
extracted and their aliphatic hydrocarbons (AH) were determinated
quantitatively and qualitatively by GC-FID and GC-MS Techniques, were used
to characterize the (AH) hydrocarbons
homologous and biomarker
compounds.The sediments contained high organic matter content, while the
hydrocarbons AH represented ٠,٣٥-٢,٧٢٪ of the total organic matter (TOM)
found in sediments.
Patients infected with different species of Leishmania in Syria develop
specific antibodies. For this reason, we have developed an immunodot assay for
the serodiagnosis of cutaneous and visceral leishmaniasis, which utilizes antihuman
IgG conjugat
ed with peroxidase (HRP) as the visualizing agent.
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