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The type of gum arabic affects interactions with soluble pea protein in complex coacervation. 2022

Talita A Comunian, and Artwin Archut, and Laura G Gomez-Mascaraque, and André Brodkorb, and Stephan Drusch
Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork P25YN63, Ireland; Department of Food Technology and Food Material Science, Technische Universität Berlin, Königin-Luise-Straße 22, 14195 Berlin, Germany. Electronic address: talita.comunian@teagasc.ie.

Complex coacervation is an encapsulation process involving two oppositely charged biopolymers. Since different compositions of gum arabic may affect its interaction with protein, we studied the complex coacervation of two types of gum arabic (GA) (Acacia senegal-GA1 and Acacia seyal-GA2) with soluble pea protein (SPP) through Zeta potential, turbidity, morphology, the secondary structure of SPP, UV/vis absorbance and thermodynamic parameters. The maximum formation of coacervates occurred at SPP:GA 3:1 (w/w) and pH 3.5-4.0 with changes in the secondary structure of SPP. GA1 combination resulted in higher binding constant, implying a stronger affinity between SPP and GA1. Entropy of 0.7 and 0.5 kJ/mol.K, and enthalpy of -151 and -95.5 kJ/mol were obtained for SPP:GA1 and SPP:GA2. The complex coacervation was spontaneous as proved by the negative values of the Gibbs free energy. GA1 resulted in stronger interactions with SPP, offering new alternatives for encapsulation of bioactive compounds.

UI MeSH Term Description Entries
D006170 Gum Arabic Powdered exudate from various Acacia species, especially A. senegal (Leguminosae). It forms mucilage or syrup in water. Gum arabic is used as a suspending agent, excipient, and emulsifier in foods and pharmaceuticals. Acacia Gum,Gum Acacia,Acacia, Gum,Arabic, Gum,Gum, Acacia
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000045 Acacia A plant genus of the family FABACEAE. The gums and tanning agents obtained from Acacia are called GUM ARABIC. The common name catechu is more often used for Areca catechu (ARECA). Locust Tree,Wattle Tree,Acacia catechu,Acacia catechus,Acacias,Locust Trees,Tree, Locust,Tree, Wattle,Trees, Locust,Trees, Wattle,Wattle Trees,catechus, Acacia
D000078724 Pea Proteins Dietary proteins that are present in or isolated from the seeds of PISUM SATIVUM. Pea Protein
D001704 Biopolymers Polymers synthesized by living organisms. They play a role in the formation of macromolecular structures and are synthesized via the covalent linkage of biological molecules, especially AMINO ACIDS; NUCLEOTIDES; and CARBOHYDRATES. Bioplastics,Bioplastic,Biopolymer

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