Abstract:In order to optimize the chelating conditions of hydrolysate with zinc, the hairtail off-cuts was hydrolyzed and used for chelating zinc chelate. Based on the single-factor experiments, the Box-Behnken central composite design and response surface method were adopted to investigate the effect of weight ratio, pH, hydrolysate concentration, chelate temperature and time on the chelation rate. The optimal chelate conditions were determined as follows: weight ratio 4.5∶1, pH 6, hydrolysate concentration 4%, chelate temperature 50℃, chelate time 40min, respectively. Under the optimized conditions, the chelating rate of hydrolysate with zinc could reach 84.16%, which basically accorded with the model predicted value. The above mentioned chelate process had the advantages of mild reaction condition and high zinc chelating rate, which provided theoretical foundation for the development of hydrolysate chelating zinc and high-value utilization of hairtail off-cuts.