Ultraviolet Radiation Affects Physical and Molecular Properties of Soy Protein Films

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Abstract
Films were cast from heated, alkaline aqueous solutions of soy protein (5 g/100 mL water) and glycerin (50% w/w of protein). Control and ultraviolet (UV) irradiated (13.0, 25.9,38.9, 51.8, 77.8, or 103.7 J/m2) films were evaluated for tensile strength (TS), elongation at break (E), water vapor permeability (WVP), and Hunter L, a, and b color values. TS increased (p0.05) by UV irradiation. UV treatment intensified the yellowish coloration of films (increased +b values). SDS‐PAGE patterns for UV‐treated samples revealed bands of aggregates, increasing in intensity with UV dosage, which were absent in control samples. These changes suggested UV‐induced cross‐linking in films.