Protein Functionality
Protein Functionality
Classification Protein must interact with other components of the food system z Hydration properties – Water absorption/retention; Wettability; Swelling; Adhesion, Dispersibility, Solubility, Viscosity z Protein-Protein Interactions – Gelation, Dough/fiber formation z Surface properties – Emulsification, Foaming
Classification Protein must interact with other components of the food system z Hydration properties – Water absorption/retention; Wettability; Swelling; Adhesion, Dispersibility, Solubility, Viscosity z Protein-Protein Interactions – Gelation, Dough/fiber formation z Surface properties – Emulsification, Foaming
Water binding z Factors influencing hydration – Protein concentration – pH – T – Ionic strength – Other compounds
Water binding z Factors influencing hydration – Protein concentration – pH – T – Ionic strength – Other compounds
Solubility z Extraction and Purification z Good Index for potential applications of proteins – Degree of insolubility – Impaired ability for gelation, emulsification and foaming – Important in food beverages z Markedly and irreversibly reduced when heating is involved z Main advantage – Permits rapid and extensive dispersion – Facilitates protein diffusion
Solubility z Extraction and Purification z Good Index for potential applications of proteins – Degree of insolubility – Impaired ability for gelation, emulsification and foaming – Important in food beverages z Markedly and irreversibly reduced when heating is involved z Main advantage – Permits rapid and extensive dispersion – Facilitates protein diffusion
Viscosity z Reflects its resistance to flow z Main factor influencing viscosity behavior – Apparent diameter of the dispersed molecules – Diameter depends on: z Intrinsic characteristics of protein z Protein-solvent interactions z Protein-protein interactions
Viscosity z Reflects its resistance to flow z Main factor influencing viscosity behavior – Apparent diameter of the dispersed molecules – Diameter depends on: z Intrinsic characteristics of protein z Protein-solvent interactions z Protein-protein interactions