Masters Dissertations : Sciencehttps://repository.sustech.edu/handle/123456789/13152024-03-28T11:23:37Z2024-03-28T11:23:37ZExtraction and Analysis of Baobab seeds Oil (Ophelussitularius)Mustafa, Esraa Abdelmonem FudolSupervisor, -Mutasim Maknoon Hassanhttps://repository.sustech.edu/handle/123456789/283582023-04-10T06:42:05Z2022-03-19T00:00:00ZExtraction and Analysis of Baobab seeds Oil (Ophelussitularius)
Mustafa, Esraa Abdelmonem Fudol; Supervisor, -Mutasim Maknoon Hassan
This study aimed to extract and analyses Baobab seeds oil. for some physical properties, chemical properties, anti-biological effect, antioxidant and GC-MS for some essential oils. 98 mL of the oil were extracted from 450 grams of seeds powder with soxhlet apparatus using hexane as a solvent. The solvent was separated by a rotary evaporator and the oil content was found to be 19.94%. The physical analysis carried out are; the density, specific gravity, viscosity, color, flash point and moisture content gave the results; (0.9158g/cm3, 0.9168, 40.58cSt, 1.5 Yellow , 280.90 Co, 0.18% ) respectively. The chemical properties analysed are; Acidity value, saponification value, iodine number and peroxide number gave the results; (0.49g KoH, 190. 70 mg/ KoH/g , 102.45 and 2.98mg Eq.O2/g oil), respectively. The results of the biological analysis showed that the oil does not contain antibacterial activity. The baobab seeds oil was found to exhibited an antioxidant and its oxidation value equals ± 46.00 %. The baobab seeds oil was also analysed by GC-MS. The results were interpreted using the data of the NIST library for mass spectrometry, and the compositions were confirmed by studying the disintegration pattern. A match was found up to 5-9% between the spectra of the components and the library data attached to the device. While the results of the gas chromatography analysis showed that the oil contains seven components, the most important of which are:
9,12-Octadecadienoic acid (Z,Z)-, methyl ester (23.71%).
9-Octadecenoic acid, methyl ester, (E) (38.50%) .
Methyl stearate (4.43%)
Hexadecanoic acid, methyl ester(30.16%)
Thesis
2022-03-19T00:00:00ZPhytochemical Constituents and Antimicrobial Activity of Adansonia digitate and Tamarinds indica leave extractsOsman, Monzir Elfadil MohamedSupervisor, Mohamed Suleiman Ali Altoumhttps://repository.sustech.edu/handle/123456789/283092023-03-27T09:46:27Z2022-09-05T00:00:00ZPhytochemical Constituents and Antimicrobial Activity of Adansonia digitate and Tamarinds indica leave extracts
Osman, Monzir Elfadil Mohamed; Supervisor, Mohamed Suleiman Ali Altoum
This study was conducted with the aim to extract and analyze the leaves powder of Adansonia digitate and Tamarindus indica, collected from forest on the south of Nyala in southern Darfour state, Sudan. Two methods of extractions from the leaves powder of Adansonia digitate and Tamarindus indica were performed; method 1: extraction by maceration using methanol solvent their yields were 8.3% and 15.6%, respectively. Method 2: successive extractions using soxhlet extractor from leaves powder of Adansonia digitate and Tamarindus indica using hexane, yielded 8.8% and 6.6 %, respectively. These extracts were subjected to phytochemical analysis Adansonia digitate showed the presence of alkaloids, Flavonoids, Tannins, steroids, Glycosides and carbohydrates. Whereas Tamarindus indica showed the presence of alkaloids, Tannins, Saponins, steroids, Glycosides and carbohydrates.
The antibacterial activity of methanol leaves extracts of Adansonia digitate, Tamarindus indica and their combined mixture (1:1) were studied in vitro against four bacterial strains namely Saphylococcus aurus, Bacillus subtitles (gram +ve bacteria) and Escherichia coli, Pseudomonas aeruginosa (gram –ve) ,using disc agar diffusion method. Tamarindus indica methanol leaves extract showed highest susceptibility against Bacillus subtilis at concentration (100mg/mL) with inhibition zone (22mm). Adansonia digitate methanol leaves extract show high susceptibility against Bacillus subtilis and Pseudomonas aeruginosa at concentration (100mg/mL), and (12.5mg/mL) respectively with inhibition zones of (20mm).the combined methanol leave extracts show high susceptibility against Pseudomonas aeruginosa at concentration (100mg/mL) with inhibition zone (20mm).
The GC-MS of Adansonia digitate leaves extract revealed the presence of 14 compounds Phenol,2-methyl-5-(1-methylethyl) (61.64%) and unsaturated fatty acid (9-Octadecenoic acid (Z)-, methylester( 8.93 %) and Hexadecanoic acid, methyl ester(5.84%) for Adansonia digitate and 10 compounds for Tamarindus indica were completely identified and the major compounds were classified as unsaturated fatty acid including Hexadecanoic acid, methyl ester (35.01%) , Methyl stearate (25.68%) , Hexadecanoic acid, 2-hydroxy-1-(hydroxymethyl)ethyl ester(22.73%).
Thesis
2022-09-05T00:00:00ZMeasurement of Radioactivity Concentration in Soil Samples from Merowe City - SudanAl-Sadig, Rofida Tahir EzzeldeenSupervisor, - Nadia Omer Al-Attahttps://repository.sustech.edu/handle/123456789/282772023-03-23T09:13:10Z2023-01-03T00:00:00ZMeasurement of Radioactivity Concentration in Soil Samples from Merowe City - Sudan
Al-Sadig, Rofida Tahir Ezzeldeen; Supervisor, - Nadia Omer Al-Atta
This study aimed to measure the concentration of natural radioactive elements in soil in Merowe City.
Thirty soil samples were collected from different locations. The specific activity was determined by using the gamma ray spectroscopy with high purity Germanium detector (HPGe), The activity ranged from 10.7 to 28.6 BqKg-1 for 226Ra, from 12.3 to 53.5 Bq/Kg for 232Th, and 148 to 807 Bq/Kg for 40K. The average absorbed dose of the terrestrial natural existing radionuclides (226Ra, 232Th and 40K) were found to be 48.152 nGy/h. The evaluated annual effective dose is 28.08 µSv/y. The mean absorbed dose is 58.321 nGy/h, and the mean radium equivalent activity is 99.975 Bq/Kg. The external hazard index is 0.757 which is less than one. The representative gamma index was 0.757 also less than one.
The results of this study were compared with other studies and found that the concentrations of 226Ra and 232Th were average with a slight increasing in Potassium 40K .
Thesis
2023-01-03T00:00:00ZGC-MS Analysis and Antioxidant Activity of Mentha Piperita OilMohamed, Sadia Abdel Rhaman Abdel GabarSupervisor, -Mohammed Abdelkarimhttps://repository.sustech.edu/handle/123456789/282612023-03-19T08:14:53Z2022-03-28T00:00:00ZGC-MS Analysis and Antioxidant Activity of Mentha Piperita Oil
Mohamed, Sadia Abdel Rhaman Abdel Gabar; Supervisor, -Mohammed Abdelkarim
This study was designed to investigate the oil from the potential medicinal plant Mentha piperita. The oil has been studied by GC. MS and the antimioxidant potential has been screened. Gas chromatography–mass spectrometry anaiysis showed 11 constituents. The oil was dominated by: i) Ievo-menthol (74.34%) ii) p-menthone (9.02%).
Mentha piperita oil has been evaluated for antioxidant activity using the DPPH assay. The oil showed significant radical scavenging activity (RSA76%) compared to the positive control-propy I gaiiate.
Thesis
2022-03-28T00:00:00Z