Research on Stability of Composite Fruit Vinegar of Apple and Pomelo

To optimizate the stability of composite fruit vinegar of apple and pomelo,single factor experiment and response surface methodology(RSM)are adopted.A mathematical model is developed and analyzed to describe the relationship between the main factors and the response of centrifugal sedimentation rate.The results of the single factor experiment show that the amount of chitosan is very significant,the clarification temperature is significant and the clarification time is very significant.The results of the response surface methodology show that the P value is lower than0.0001,R2 Adjis 0.9740 and Adeq.Precision is 22.738 from the regression model.It indicates that the model is adequate to describe the experimental value.Based on the canonical analysis,the optimum conditions are obtained as follows:the amount of chitosan is 0.55g/L,the clarification temperature is55.9 ℃and the clarification time is 5.8h.Under the optimized conditions,it can be included that the centrifugal sedimentation rate is 0.0235% attained by using regression model,which is close to the theoritical value 0.0238%.