The effect of plasticizer on betalactoglobulin (.Lg) film glass transition temperature (Tg) was investigated toelucidate the plasticization mechanism. The Tg of film containing polyethylene glycol 400 (PEG 400) as a plasticizer couldnot be observed because an icemelting peak occurred during heating. Films plasticized by propylene glycol (PG), glycerol(Gly), and PEG 200 possessed similar film Tg values, related to the plasticizer waterbinding properties. However, sorbitol(Sor) and sucrose (Suc) produced higher film Tg values due to their larger MW and solidstate plasticizer behavior. Lubricationof .Lg molecules by plasticizer domains external to the .Lg is suggested as a film plasticization mechanism because noshift in film Tg was observed with increasing plasticizer content. The size, shape, and physical state of plasticizer were thekey factors affecting film properties, consistent with previous results on mechanical and oxygen permeability (OP) properties.
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Sothornvit et al. (2002) studied this question.
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