Effect of pH, biopolymer mixing ratio and salts on the formation and stability of electrostatic complexes formed within mixtures of lentil protein isolate and anionic polysaccharides (κ-carrageenan and gellan gum)

• Published in: International journal of food science & technology Vol. 49; no. 1; pp. 65 - 71
• Main Authors: Aryee, Felix N. A., Nickerson, Michael T.
• Format: Journal Article
• Language: English
• Published: Oxford Blackwell Publishing Ltd 01.01.2014; Wiley-Blackwell; Wiley Subscription Services, Inc
• Subjects: Associative phase separation; Biological and medical sciences; Biopolymers; complex coacervation; Food industries; Food science; Fundamental and applied biological sciences. Psychology; Gellan gum; Ions; lentil proteins; Lentils; Mixing ratios; Polysaccharides; Proteins; Salt; Turbidity; κ-carrageenan; Mixing; Stability; κ-carrageenan; Gellan gum; complex coacervation; Food additive; Protein isolate; Complexes; Mixture; Protein; Lentil; Salt; Gelling agent; Associative phase separation; lentil proteins; Quality; Phase separation; Biopolymer; pH; Ratio; Carrageenan; Polysaccharide
• ISSN: 0950-5423; 1365-2621
• DOI: 10.1111/ijfs.12275

Summary Associative phase separation within lentil protein isolate (LPI), polysaccharide (κ‐carrageenan (κ‐CG) and gellan gum (GG)) mixtures was investigated as a function of pH (1.50–8.00) and mixing ratio (1:1–30:1; LPI/polysaccharide) by turbidity and electrophoretic mobility. Effects of salts (NaCl, KCl and CaCl2) on complex stability were also studied as a function of ionic strength. Coacervation typically follows two pH‐dependent forming events associated with the formation of soluble and insoluble complexes. The addition of polysaccharides to a LPI system (at all ratios) resulted in a significant drop in turbidity over the entire pH range and a shift in net neutrality to lower pH relative to LPI alone; where LPI aggregation was inhibited by repulsive forces between neighbouring polysaccharide chains. As the biopolymer mixing ratio increased, structure formation was less inhibited. The addition of salts resulted in the disruption of formed LPI/polysaccharide complexes.