Gum arabic

About: Gum arabic is a research topic. Over the lifetime, 2197 publications have been published within this topic receiving 47782 citations. The topic is also known as: acacia gum.

Single-layer and double-layer zein-gum arabic nanoencapsulations: Preparation, structural characterization, thermal properties, and controlled release in the gastrointestinal tract.

Abstract: Encapsulation is one of the most convenient ways to increase the solubility of hydrophobic compounds and enhance the protection of sensitive compounds. The development of natural and edible encapsulation systems is a challenge for the food industry. This study explored two kinds of nanoparticles (NPs) made by zein and gum arabic (GA) and investigated the protective and controlled release effect of the formed NPs on rutin. Single-layer NPs (ZG) formed with a zein and GA mixture and double-layer NPs (ZWG) with one inner layer of zein and one outer layer of GA were prepared with a series of mass ratios of zein to GA. The particle size, polydispersity index, and zeta potential were obtained, and the structure and morphology of the NPs were observed using scanning electron microscopy. As shown by the differential scanning calorimeter and thermogravimetric analysis, the heat resistance of ZG is higher than the heat resistance of ZWG. ZG showed slower release of rutin in the simulated gastric and small intestinal solutions than ZWG. These results will help in understanding the different behaviors of protection and controlled release of layered NPs made by mixtures of biopolymers, which can be directly applied to the design of delivery systems of sensitive bioactive compounds in the food industry.

Diphenyl methane derivatives and their preparation

Abstract: Compounds of formula where X is hydrogen or halogen, Y is and n is 1, 2 or 3 when group Y is bonded to the -(CH2)ngroup through a nitrogen atom or n is 0, 1, 2 or 3 when Y is are prepared by reacting a compound of formula with an excess of a compound of formula HO-(CH2)n-Y in the presence of toluene-p-sulphonic acid. The products, some of which are new, may be converted to the hydrochlorides. Examples are given. Products of the above formula may be mixed with diluents e.g. with shellac, talc, sugar, tartrazine yellow, carnauba wax and gum arabic and formed into tablets, for use as antihistaminic agents, sedatives and tranquillizers.

Gum Arabic-Coated Magnetic Nanoparticles for Methylene Blue Removal

Abstract: Magnetic nanoparticles (MNPs) were fabricated using the chemical co-precipitation method followed by coating the surface of magnetic Fe3O4 nanoparticles with gum arabic (GA). The fabricated magnetic nanoparticles were characterised using transmission electron microscopy (TEM) which showed that the Fe3O4 nanoparticles and GAMNPs nanoparticles had a mean diameter of 33 nm, and 38 nm, respectively. Scanning electron microscopy (SEM) images showed that the MNPs modified with GA had homogeneous structure and agglomerated. The energy dispersive X-ray spectroscopy (EDAX) spectrum showed strong peaks of Fe and O. X-ray diffraction patterns (XRD) indicated that the naked magnetic nanoparticles were pure Fe3O4 with a spinel structure and the covering of GA did not result in a phase change. The covering of GA on the magnetic nanoparticles was also studied by BET analysis, and Fourier transform infrared spectroscopy.Moreover, the present study reports a fast and simple method for removal and recovery of methylene blue dye (MB) from aqueous solutions by using the synthesised magnetic nanoparticles modified with gum arabic as adsorbent. The experimental results show that the adsorption process attains equilibrium within five minutes. The data fit the Langmuir isotherm equation and the maximum adsorption capacities were 8.77 mg mg-1 and 14.3 mg mg-1 for MNPs and GA-MNPs, respectively. The results indicated that the homemade magnetic nanoparticles were quite efficient for removing MB and will be a promising adsorbent for the removal of harmful dyes from wastewater.

Protecting agent for printing plate of lithography and its manufacturing

Abstract: PROBLEM TO BE SOLVED: To increase viscosity, and thereby solve problems such as the deterioration of wiping properties or gum removing properties by preparing a printing plate protecting agent used for protection of a printing plate for lithography with the addition of gum arabic and an organic reducing agent. SOLUTION: When manufacturing a printing plate protecting agent for a lithographic printing plate, rubber arabic and an organic reducing agent are added. In this case, the gelation of the printing plate protecting agent is prevented from occurring by using the rubber arabic with a moisture content of not more than 15%. Further, if the rubber arabic with a moisture content of 15% or more needs to be used, the gelation can be prevented from occurring by preparing the printing plate protecting agent at 60 deg.C or higher. Besides, it is preferable that as the organic reducing agent, a combination of 3- pyrazolidons and dihydroxybenzenes, a combination of aminophenols and dihydroxybenzenes or a combination of 3-pyrazolidons and ascorbic acid or a combination of aminophenols and ascorbic acid be used. This organic reducing agent is usually used at a dose of 0.001-1.4mol/l.