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.

Economic Incentives for Entry and Exit in Gum Arabic Agroforestry System in Sudan

Abstract: The gum tree (Acacia senegal) in the Sahel-Sudan zone has many environmental benign functions. An important function is to control desertification. In this paper we analyze farmers' economic incentives to preserve the existing gum trees and their incentives to create new plantations using a real options approach. Results indicate that agricultural crops provide higher economic benefits as compared to gum agroforestry system. However, on the one hand, as gum arabic is produced during the dry period and land is abundant, there are low incentives for deforestation. Instead, farmers' tend to leave the land idle and let the tree growing. On the other hand, our results suggest that an increase in the prices of gum arabic of about 330 per cent is needed to induce entry and a shift in land use system from continuous agricultural production to gum agroforestry system.

Preparation of Fucoxanthin Nanoemulsion Stabilized by Natural Emulsifiers: Fucoidan, Sodium Caseinate, and Gum Arabic

Abstract: This study was proposed to investigate the possibility of O/W nanoemulsion stabilization via natural emulsifiers as a delivery system for fucoxanthin. Nanoemulsions were prepared using ultrasonic treatment (150 W, amplitude 80%, 10 min) with different levels (0.5%, 1%, and 2% wt) of fucoidan, gum Arabic, and sodium caseinate as natural emulsifires and they were compared with tween 80. Then, the creaming index, stability, encapsulation efficacy, Fourier-transform infrared (FT-IR) spectroscopy, and in vitro release were evaluated. The best stability and lowest creaming index were observed at 2% wt of emulsifiers. Nanoemulsions with droplet sizes (113.27–127.50 nm) and zeta potentials (−32.27 to −58.87 mV) were prepared. The droplet size of nanoemulsions was reduced by increasing the emulsifier concentration, and the best nanoemulsion stability after 15 days of storage was in the following order: tween 80 > sodium caseinate > fucoidan > gum Arabic. The encapsulation efficacy of nanoemulsions stabilized by sodium caseinate, fucoidan, and gum Arabic were 88.51 ± 0.11%, 79.32 ± 0.09%, and 60.34 ± 0.13%, respectively. The in vitro gastrointestinal fucoxanthin release of nanoemulsion stabilized with tween 80, sodium caseinate, fucoidan, and gum Arabic were 85.14 ± 0.16%, 76.91 ± 0.34%, 71.41 ± 0.14%, and 68.98 ± 0.36%, respectively. The release of fucoxanthin from nanoemulsions followed Fickian diffusion. The FTIR also confirmed the encapsulation of fucoxanthin.

A herbicide composition comprising clomazone encapsulated within microcapsules formed by coacervation of amphoteric polymer electrolytes

Abstract: A herbicide composition comprising clomazone encapsulated within microcapsules formed by coacervation of amphoteric polymer electrolytes. The microcapsules wall is formed from a cellulose derivative, for example carboxymethyl cellulose, a natural gum, for example gum Arabic, and gelatin. The microcapsule wall preferably comprises a cross linking agent, in particular a glycoluril resin. A method for encapsulating clomazone by coacervation is also provided.

Purification and viscosity experiments on gum arabic

Abstract: A purification procedure for gum arabic is reported. The impurities can be entirely removed by treating the aqueous solutions with cation exchange resin. The samples are precipitated by acetone. The ionic impurities are found to consist of Mg, and traces of Fe have been confirmed. The effect of these ions on the viscosity contribution is investigated. The presence of these impurities causes a decrease in the limiting viscosity number which can be explained by electrovalent crosslinking. A similar effect is ob served for a sample that has been dried over concentrated sulfuric acid and can in this case be explained by covalent crosslinking.