Thummanoon Prodpran and Soottawat Benjakul

pp. 563 - 574

Abstract

The effect of acid and alkaline solubilizing processes on the properties of the protein based film from
threadfin bream surimi was investigated. Surimi films prepared from both processes had the similar light
transmission, tensile strength (TS) and elongation at break (EAB) (P<0.05). However, film with alkaline
process had slightly lower water vapor permeability (WVP), compared to that prepared by acid solubilizing
process. The protein concentration in the film-forming solution directly affected the properties of the film.
Increase in protein concentration resulted in an increase in TS, EAB as well as WVP. The film prepared by
acid solubilizing process had an increase in yellowish color as evidenced by the continuous increase in b*
and E* values during the storage at r oom temperature. The acid and alkali solubilizing processes caused
the degradation of muscle protein in surimi, especially with increasing exposure time. Therefore, solubilizing
process had the influence on the properties of the protein film from threadfin bream surimi.