Gum Arabic / Gum Acacia

The dried exudate (gum) from Acacia Senegal and related species (Acacia Seyal)

Gum Arabic

Origin

Collection (origin) and Processing (Europe)

Structure

– chemical composition

Properties

– functional characteristics and influences

Applications

Important Quality Parameters

Comparison of the different grades

Our qualities

Gum Arabic – Origin

South of Sahel zone, mainly Sudan, Chad and Nigeria

Gum Arabic – Collection

Tapping

Cleaning

Sieving

Gum Arabic – Processing

Dry
– powder
– granular

Wet
– spraydrying
– rollerdrying

Gum Arabic – Structure

Complex polysaccharide

– neutral or weakly acid

– containing nitrogenous material (amino acids)

– chemical composition vary slightly

– contained sugar monomers in a ratio of 3:3:1:1 are

• galactose, arabinose, rhamnose and glucoronic acid

– highly branched molecule with great variation in molecular mass

Gum Arabic – Properties

readily dissolves in cold water

odourless

tasteless

viscosity is a function of concentration

Solutions of Gum Arabic below 40 %
– react like Newtonian liquid

• viscosity is shear rate independent

Solutions of Gum Arabic at higher concentrations
– show pseudoplastic characteristics

• shear thinnig
reversible decrease of viscosity with increasing shear forces

weakly acid character in water (pH 4.5)

pH of the solution affects the viscosity

viscosity decreases in the presence of electrolytes (salts)

comparison with other thickening agents shows lower viscosity of Gum Arabic solutions even at higher concentrations

emulsifier for essential oils and flavours

– proteins adsorb on the surface of the oil droplets

– formed emulsions remain stable for a long period of time

Disadvantage:

prolonged heating ( > 70 °C) of Gum Arabic solutions causes precipitation of the proteinous components !!!

Source: http://hobbytakt.com/products/3856466109.pdf

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