In this paper we report the isolation, purification and characterization of three triterpenes, stigmasterol (1), α -amyrin (2), and lupeol acetate (3) from the hexane extract of Calatropis procera leaves. These three natural compounds have been identified before from C. procera and from other plants. The compounds 1, 2 …
The plant kingdom provides many precious gifts to mankind. One of these gifts is its ability to produce an endless stream of natural products. Moringa peregrina (In Oman called Al Shua) provides a wide range of benefits to traditional medicine in many cultures, as well many nutritional values. This paper discusses the …
The usefulness of caffeine (CF) as a chelating agent to increase the luminescence intensity of terbium (Tb3+) was studied. The efficiency of the developed Tb3+/CF- coordination nanoparticles was evaluated as a sensing platform for the detection of fluoroquinolone antibiotics, using norfloxacin (NF) as a model analyte. …
Application of 3-Naphthyl-1-(4-trifluoromethyl)-5-(4-carboxy phenyl)-2-pyrazoline (NFCP) as a novel fluorigenic label for the derivatization of biogenic amines (BAs) and separation by liquid chromatography (LC) was investigated. Optimum conditions for the pre-column derivatization and chromatographic separation were in …
The vast use of polyethylene terephthalate (PET) drinking water bottles has increased dramatically worldwide in recent decades, inflicting severe consequences on the environment. According to the latest survey, a million plastic bottles are bought around the globe every minute. The non-biodegradable nature of PET mater …
Dehydrated carbon (DC) was prepared from date palm leaflets via sulfuric acid treatment. DC was functionalized via amide coupling using ethylene diamine (EDA) and propylene diamine (PDA) to produce basic dehydrated carbons (BDCs): BDC-EDA and BDC-PDA, respectively, and using ethylamine (EA) and aniline (AN) to produce …
A novel ethoxy derivative of an amino acid chemosensor, 3-naphthyl-1-phenyl-5-(2ʹ-fluoro-5ʹ-nitrophenyl)-2-pyrazoline (NPFNP), has been synthesized and characterized by different spectroscopic methods. A single crystal of the ethoxy derivative, 3-naphthyl-1-phenyl-5-(2ʹ-ethoxy-5ʹ-nitrophenyl)-2-pyrazoline NPENP, has be …
The chemical contents and compositions of four essential oils extracted from leaves, branches, fruits and gum-resin of Juniperus excelsa from Jabal Al-Akhdhar in the Sultanate of Oman were studied using infra-red (IR) spectroscopy and gas chromatography-mass spectrometry (GC-MS). IR analysis revealed the presence of C- …
n-Butanol extracts of nine medicinal plants, Cressa cretica, Ziziphus spina-christ, Acacia tortilis, Tephrosia haussknechti, Aristolochiae bracteolata, Citrullus colocynthis, Teucrium mascatense, Rhazya stricta and Nerium oleander, found in Oman were screened for their antioxidant activity using phosphomolybdenum compl …
The isolation and structural elucidation of aristolochic acid-A and aristolochic acid-D from Omani Aristolochia bracteolata plant is reported. Antioxidant activities of these two natural products were evaluated for their capacity to reduce Mo(VI) to Mo(V). The study revealed that aristolochic acid-D is more active than …