Research of deodorization on enzymatic hydrolysis of China taihe chicken and preparation of freeze-dried powder

The deodorizing of the hydrolysis fluid of silky fowl was studied, and then hydrolysis fluid was processed into freeze-dried powder after deodorizing.The results showed that active dry yeast had much more effect than active carbon and β-cyclodextrin for the deodorizing.And the optimum treating condition was added 0.2% citric acid in the hydrolysate after the hydrolysate was fermented for 1h at 28℃ with the amount of yeast 1.5% and then was centrifuged at 5000r/min for 20min.The value of fishy smell was 1.0, the value of bitter was 1.5 under optimum treating conditions.And with light yellow, faint yeast aroma, and with good re-hydrated rate, the freeze-drying powder had hardly any bitter and fishy smell.The moisture content of the dry powder was 4.18% and the ash content was 4.61%, mass fraction of the multi-peptides was 66.67%, nitrogen recovery rate was 91.26%.