M.E. Osman

Sudan University of Science and Technology | SUSTECH · Department of Chemistry (College of Science)

This study aimed to characterize the exudate gum from Acacia nilotica var. nilotica in Sudan and compare its physicochemical properties to Acacia seyal var. seyal and Acacia senegal var. senegal (gum Arabic). Samples were collected from six different states in Sudan over three seasons. The gum had a moisture content of 10.50%, ash content of 1.86%,...

Oil-in-water emulsions were prepared using two gums from the Vulgares series, namely Acacia senegal var. senegal (ASG) and Acacia mellifera (AMF), along with a 1: 1 blend of these gums. Various concentrations of Isopropyl Myristate (IPM) oil were utilized, and the emulsions were monitored for four weeks at 45°C. The morphology of the emulsions reve...

The present study compares the emulsifying properties of Acacia senegal gum, glucuronic acid (arabic acid) and glucuronates (arabate salts) in oil-in-water (O/W) emulsions. Emulsifying properties of each hydrocolloid were evaluated in terms of emulsion droplet-size distribution. Emulsion of Na, Ca and Mg glucuronates show stability until 3 days whi...

This study aims to determine the composition and thermal behavior of three acacia gums, namely, Acacia sieberiana, Acacia gerrardii, and Acacia tortilis (ATR) from Sudan. The results showed high percentages of carbon and oxygen and a low percentage of sulfur in all samples. Thermal behavior was studied using differential scanning calorimetry and th...

Three composite samples of Gummeferae gum of positive specific optical rotation (+S.O.R) A.nilotica var. tomentosa season 2015, A.nilotica var nilotica season 2010, and A.Orefota season 2015, from Sinnar, Blue Nile states and El-Jazeera states were subjected to physicochemical analysis. The results showed moisture contents were (11.17%, 11.6%, and...

Solutions at relatively high concentration (25%-50%) of Composite samples of subspecies, A. nilotica var. tomentosa, A. nilotica var. nilotica from Sinnar, Blue Nile, and A. nilotica subsp. adistringen from Kordofan state, were subjected to Shear flow viscosity, and Oscillating flaw behaviour. At (50%) concentration, the results show Newtonian flow...

Authentic representative gum exudate samples from Acacia species namely Acacia senegal var. senegal (ASG), Acacia mellifera (AMF), Acacia seyal var. seyal (ASY), and Acacia tortilis var. raddiana (ATR), were physicochemically analyzed. The moisture, ash, nitrogen and protein content, pH, specific optical rotation, and number average molecular weigh...

Structural properties of gum Arabic are one of the most important factors affecting the competitive prices in the domestic and overseas markets. Using laboratory standard methods, a number of methods were used to characterize the main alterations of the components of Acacia Senegal var. Senegal gum Arabic induced by inoculation with some species of...

The thermodynamic properties of A. senegal gum, A. seyal gum (gum arabic) and A. polyacantha gum solutions were measured and calculated. The partial specific volume of gum, partial specific volume of the solvent (water) and the volume fractions were measured and calculated. The results show that the sequences of the specific volumes of the gums und...

Authenticated samples of Acacia seyal var. seyal and Acacia seyal var. fistula have been investigated. Samples of each variety from young (5–7 years) and old trees (15–20 years) were collected during the same season from the Eldamazeen area of Sudan. For each variety, two types of gum exudates (seep and nodule form) were collected. The solubility,...

The chemical and physicochemical characteristics of five authenticated A. senegal gum samples from trees of varying age have been investigated. A. senegal was fractionated by a successive non-solvent fractionation technique using ethanol and acetone as a fractionation agent separately. The fractions were found to be different from the whole gum in...

Research Article 129  Abstract— Arabic acid was prepared from Acacia senegal gum by the removal of metal ions using ion exchange chromatography. Arabate salts of (Na, K, Ca and Mg) were prepared using arabic acid by adding respective cations. Scanning electron microscope (SEM) proved successful production of arabic acid and arabate salts. pH value...

The determination of weight average molecular weight (M w) and radius of gyration (R g) of Habeil gum was performed on a gel permeation chromatography-multi angle laser light scattering (GPC-MALLS) system. The results showed three main components of Combretum glutinosum gum designated arabinogalactan protein (AGP), arabinogalactan (AG) and glycopro...

Dealing with the latest information on polysaccharide gum research, particularly focused on gum Arabic, as discussed at the World Conference on "New developments in Acacia Gums Research and Products", this book covers the production, identification, classification and application of these important carbohydrate polymers. Written by the world's lead...

Dealing with the latest information on polysaccharide gum research, particularly focused on gum Arabic, as discussed at the World Conference on "New developments in Acacia Gums Research and Products", this book covers the production, identification, classification and application of these important carbohydrate polymers. Written by the world's lead...

Dealing with the latest information on polysaccharide gum research, particularly focused on gum Arabic, as discussed at the World Conference on "New developments in Acacia Gums Research and Products", this book covers the production, identification, classification and application of these important carbohydrate polymers. Written by the world's lead...

Dealing with the latest information on polysaccharide gum research, particularly focused on gum Arabic, as discussed at the World Conference on "New developments in Acacia Gums Research and Products", this book covers the production, identification, classification and application of these important carbohydrate polymers. Written by the world's lead...

The synthesis, characterization, and hydrogel properties of starch-g-(tert-butylacrylate) and starch-g-(n-butylacrylate) copolymers were studied. The optimum conditions for the grafting process of tert-butylacrylate into 1.0g of starch were as follows: [tert-butylacrylate]=0.04mol/L, [CAN]=9.0×10−4mol/L, temperature=20°C in 100mL solution, whereas...

Acacia seyal was fractionated on the basis of molecular size and hydrophobicity into a number of fractions. The molecular weight of the whole gum and its fractions were determined using gel permeation chromatography (GPC) with on-line monitoring using light scattering, refractive index and UV absorbance detectors. The results show that the three ma...

Grafting of N-tert-butylacrylamide (BAM) onto starch in aqueous medium initiated by ceric ammonium nitrate ion has been studied under N2 atmosphere. The optimum conditions with respect to monomer concentration, initiator concentration, polymerization temperature, polymerization time and material to liquor ratio were studied in terms of percent of g...

Over 1500 authentic and commercial A. senegal var. senegal gum samples were analysed to evaluate existing quality control parameters and to assess the potential of new parameters such as pH, viscosity, viscosity average molecular weight (MV) equivalent weight and total uronic acid content as additional qualifying indices. The data obtained indicate...

The physiochemical and immunological properties of three Sudanese gum arabic samples and four gum tahla samples (two Sudanese, one West African and one Tanzanian--Acacia seyal var. seyal) were compared. The optical rotation (ca -30 degrees) and rhamnose (12-14%), arabinose (24-29%), galactose (36-42%), glucuronic acid (16-17%), nitrogen (0.327-0.36...

Three methods that have been suggested as inexpensive for characterisation of gum arabic were evaluated in characterising and monitoring gum arabic of commerce. The methods were; physico-chemical and carbohydrate analysis (analytical), determination of molecular mass by gel permeation chromatography (gpc) and an Enzyme Linked Immunosorbent Assay (E...

Two samples of authentic gum arabic (A and B) have been fractionated by anion-exchange chromatography on DEAE-cellulose. The fractions were isolated by a step-wise increase in the ionic strength of the elution buffer. Samples A and B yielded five and six fractions, respectively. All of the fractions isolated were polydisperse containing varying pro...

Four gum arabic samples obtained from various African countries (Sudan, Chad and Senegal) were separated into three or four fractions by hydrophobic interaction chromatography on Phenyl Sepharose CL-4B. The molecular mass distribution of the fractions was monitored using gel permeation chromatography on a Superose 6 column and indicated that each w...

An enzyme linked immunosorbent assay (ELISA) has been developed for Acacia senegal gum using antibodies raised in rabbits immunised with Freund's complete adjuvant containing an authentic specimen of A.senegal (Kordofan, Sudan). Size exclusion chromatography readily shows the presence of three molecular mass fractions in the gum namely an arabinoga...

Gum arabic (Acacia senegal gum) was fractionated by hydrophobic interaction chromatography on Phenyl-Sepharose CL-4B and yielded four fractions of similar carbohydrate composition, whilst differing in protein content, amino acid composition, and molecular mass distribution. All four fractions interacted with an array of anti-arabinogalactan-protein...

Six commercial gum arabic samples and authenticated samples of gum from Acacia senegal and Acacia seyal have been characterised using a range of chemical and physicochemical techniques including determination of specific rotation, sugar composition, nitrogen and amino acid content, and molecular mass distribution. Although some of the gums have sli...

This sixth volume in the Gums and Stabilisers series is based on the 6th Wrexham Conference which took place in July 1991. As such it reflects the new trends and concerns which are associated with the industry, placing major emphasis on the practical aspects of the subject, and integrating the knowledge of the academic researcher with the experienc...