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.

Effect of Coatings of Silver Nanoparticles and Gum Arabic on Physicochemical and Microbial Properties of Green Bell Pepper (Capsicum annuum)

Abstract: The main objective of this work was to study the effects of gum Arabic and silver nanoparticles on the quality of green bell peppers during 21 days of storage. Gum Arabic in aqueous solution of 10%, silver nanoparticles and silver nanoparticles–gum Arabic solution blend, coatings were formed directly on the surface of green bell peppers (Capsicum annuum) and were placed in incubators at 7 and 20C with a relative humidity of about 85%. Fruit quality was evaluated by weight loss, firmness retention, ascorbic acid content, surface color development and microbial decay. Gum Arabic coating presented lower ascorbic acid degradation, weight loss and textural damage but did not affect total aerobic count. Silver nanoparticles hindered microbial decay while did not prevent ascorbic acid decomposition, weight loss and firmness loss. Gum Arabic combined with silver nanoparticles significantly hindered microorganisms' growth and physicochemical losses and showed the best performance for enhancing the shelf life of green bell peppers. Practical Applications This study indicated that gum Arabic coating hinders water loss, texture softening and vitamin C decomposition, and silver nanoparticles have antimicrobial effects; thus, combination of these two materials results in development of a coating, which improves the nutritional value and marketability of green bell peppers.

Analytical Studies on the Gum Exudates from Anogeissus leiocarpus

Abstract: Anogeissus leiocarpus gum samples were collected randomly as natural exudates from 3 different locations in Sudan, namely Abojebiha (season 1994-1995), Elfula and Rosaries (season 1996-1997). Physicochemical properties of gum samples (moisture, ash, nitrogen, protein, specific rotation, relative viscosity, refractive index, equivalent weight, pH, uranic acid, reducing sugar and tannin content). Results showed significant differences within each location in most parameters studied except in the refractive index values which was found to be constant in all samples (1.334). The effect of location on the properties of gum samples was also studied and the analysis of variance showed insignificant differences (p<0.05) in al l properties studied except in ash content and this may be due to the differences in the type of clay soil which found in the three different locations. The general characteristics of Anogeissus leiocarpus gum might be described as the mean value of all properties studied of all gum samples of the three different location as follows: 9.2% moisture, 3.4% ash, 0.72% nitrogen, 4.74% protein%, -35.5° specific rotation, 1.68 relative viscosity, 4.2 pH, 1.334 refractive index, 14.3% uranic acid, 0.44% reducing sugar 1336.0% equivalent weight and 0.68% tannin content. UV absorption spectra of gum samples were determined and the maximum absorption points were found the same ranging between wave length 243 and 285. Cationic composition of gum samples was also determined and the results showed that magnesium (Mg) has the highest value in all samples followed by iron (Fe), sodium (Na), potassium (K), calcium (Ca), zinc (Zn) and trace amount of manganese (Mn), copper (Cu), nickel (Ni), cadmium (Cd) and lead (Pb). Functionality (water holding capacity and emulsifying stability of Anogeissus leiocarpus gum were studied. The water holding capacity value was found to be 65.5% and emulsifying stability value was found to be 1.008 insignificant differences were observed between Anogeissus leiocarpus gum and Acacia senegal gum for the 2 parameters studied.

Optimization for spray drying process parameters of nutritionally rich honey powder using response surface methodology

Abstract: The purpose of the present work was to study the effect of inlet temperature (160–180°C), feed rate (0.08–0.13 ml/s), concentration of gum Arabic (35–45%), aonla extract (6–8%), and basil extract (6–8%) on the product properties (bulk density, hygroscopicity, total phenolic content (TPC), antioxidant activity (AOA), and vitamin C content) of spray-dried nutritionally rich honey powder using response surface methodology. Higher inlet air temperatures led to lower bulk density and hygroscopicity, whereas addition of aonla and basil extracts led to higher TPC, AOA, and vitamin C content which were encapsulated by gum Arabic. Statistical analysis showed that independent variables significantly affected all the responses (p < 0.0001). Perturbation and 3D surface plots were drawn for each of the responses from the mathematical models. Second-order polynomial models with high R2 (0.97–0.99) values were constructed for each powder physicochemical properties namely bulk density, hygroscopicity, TPC, AOA, a...

Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings

Abstract: Recently, interest in developing green polymer coatings which provide self-healing and corrosion protection functions using bio-based renewable materials has significantly increased. In this study, microcapsules containing biopolymers from cashew gum and gum Arabic have been prepared by interfacial polymerization. The prepared microcapsules were individually and combinatorially embedded into epoxy coatings and the resulting composite coatings were then applied on Q235 steel substrates. The performance of the composite coatings was evaluated by immersing both scribed and unscribed coatings in simulated seawater. Surface analytical (SEM), physico-chemical (FTIR, XRD, XPS), and electrochemical impedance spectroscopy (EIS) techniques were used to investigate self-healing and corrosion resistance effectiveness of the polymer composite coatings. The obtained results revealed that cashew gum and gum Arabic could heal the scribed coating surface and subsequently suppressed corrosion reaction, without the aid of any catalyst or co-reactant. The performance was observed to be higher when the two gum exudates were combined. Thus, cashew gum and gum Arabic have demonstrated that they possess properties required for potential utilization in the formulation of marine anticorrosion and self-healing epoxy coatings.