Gel properties of threadfin bream(Nemipterus bleekeri) surimi added with fish gelatin at
different levels(0–20% protein substitution)incombination with microbialtransglutaminase (MTGase)at various concentrations(0–1.2 unitsg−1 surimi)were studied. Breaking force and deformation of surimi gel decreased when the levels of fish gelatin increased
(po0.05). When MTGase was incorporated, the increases in breaking force and deformation
were obtained in surimi gel added with 0–15% fish gelatin.Nevertheless, the addition of
MTGase at higher levels led to the decrease in both breaking force and deformation of
surimi gel containing 20% fish gelatin(po0.05). Addition of fish gel at in could lower the
expressible moisture content of surimi gel. Band intensity of myosin heavy chain(MHC)
and actin of surimi gel decreased when fish gelatin levels increased,mainly due to dilution
effect. The coarser and irregular gel structure was obtained when fish gel at in was added.
The addition of 1.2 units MTGaseg−1 surimi decreased MHC in surimi gel containing fish
gelatin slightly.