Study On Powder Properties Of Fructose-oligosaccharide And Whey Protein And Its Application In Mixing And Filling

Fructose-oligosaccharide and whey protein are functional food materials with a wide application,always in the form of powder.The key problem should be solved in industrial processing is the stability of material mixing,transportation,filling and storage.This study choose Purified fructose-oligosaccharide(P-FOS),Whey protein concentrate-80(WPC80)as the main formula materials,maltodextrin as auxiliary materials,aim at the key factors that PFOS easily moisture absorption,poor liquidity,WPC80 higher compression ratio which influence the stability of production,studied the material properties of three kinds of single powder and their change regularity.Discussed the influence factors of the mixing of P-FOS,WPC80 and maltodextrin(WPM),and applied in large scale and process capability verification,the main research contents and results are as follows:1.Studied the powder properties of three single materials(P-FOS,WPC80 and maltodextrin)and conducted the regression analysis.The principal component content,flow index(ff)and micromorphology of different materials were measured by HPLC,PFT and SEM.On the basis of confirming that there is no significant difference in the principal components with different particle sizes,the influence of different particle sizes and their proportions on the fluidity of powders was focused research.It was found that the particle size of P-FOS and maltodextrin conforms to the quadratic equation with ff by means of the experimental design of D-optimal mixture and the analysis of simple centroid,and the two regression models were proved effective.The R-Sq(prediction)of the two regression models was up to 97.86% and 99.66%.The results show that if the particle size distribution of a batch of powders was known,the fluidity could be predicted,and the stable target flow index can be obtained by adjusting the proportion of different particle size,thus providing a simple and quick method for effectively regulating the powder flow in actual production.2.Using oligosaccharide and protein content as evenness indexes,the fluidity,compressibility and moisture absorption of WPM with different mixing ratios were studied.On the basis of uniform mixing,the correlation between different powder proportion with ff and compression degree was discussed.The results showed that the proportion of different powders was significantly correlated with the degree of compression,which was consistent with the quadratic regression model,and the R-Sq(prediction)was up to 97.64%.Aiming at the problem that P-FOS is easy to absorb moisture and difficult to store,the gradient humidity environment was prepared with a constant Humidity solution,the moisture absorption rate of different WPM and Critical Relative Humidity(CRH)were investigated,and the CRH of each monomer component was proved to have a summation relation to the total CRH of WPM.The research results can provide a scientific basis for environmental humidity control during industrialized production.3.Carried out the industrialized application of WPM mixing,filling and evaluation.The mixing time of the automatic lifting hopper mixer is optimized to be 11 min with the mixing evenness and triangular sensory evaluation as the indexes.In the filling process,choose size and environment humidity as key points,after evaluate the fluctuation of vacuum,net content and process capability index(CPK),it is concluded that when the control the fine particle powder proportion,and ensure the environmental humidity lower than its CRH,the CPK of net content can be increase to 1.33 above,quality control level can be reach to 6?,and accessed accelerated test.The results can provide important practical guidance for the continuity and stability of mass production.