Study On Physicochemical Quality Of Elm Bark Noodles And Optimization Of Extraction Conditions Of Crude Polysaccharide From Elm Bark

Ulmus pumila,as a valuable tree species,has been widely used in medicine,food,industry and so on.In this paper,the specific distribution and classification of edible elm germpl asm resources,the propagation techniques and breeding techniques of elm,and the existing comprehensive utilization of elm were summarized In this paper,the main functional components and functions of the leaves,bark and cash of ulmus pumila were reviewed,and the application of ulmus pumila bark in food was studied.Elm bark powder,as a useful plant resource,is widely used in noodle-making in northeast China and Shaanxi Province.The effects of different amount of elm bark powder on dynamic rheological properties of dough and noodle quality were studied.In this experiment,the common elm bark flour was taken as the research object to study the dynamic rheological properties of dough,texture properties of noodles and the tensile properties of noodles with different amount of elm bark flour at the same time,the optimum cooking time,the loss rate of dry matter,the water absorption rate of dry matter and the broken rate of noodles were determined.The results showed that the dynamic rheological properties and noodle quality of the dough were changed with the addition of elm bark powder,and the viscoelastic properties and tensile properties of the dough were the best when the addition was 15%,and the dry matter loss rate of the noodle was the best,the water absorption rate and the broken rate were the lowest,and the texture characteristics of noodles were better.Comprehensive consideration: The optimum addition of elm bark powder is 15%.In order to study the content of crude polysaccharide from elm bark,the optimum extraction conditions of crude polysaccharide from elm bark were determined by orthogonal test.On the basis of single-factor experiment,three factors were selected:extraction temperature,ethanol concentration and extraction time,and three levels were selected for each factor to carry out orthogonal experiment,through a series of analysis of the experimental results by the design method and principle of orthogonal test,the optimum extraction conditions were obtained: The extraction temperature was 80 °c,the concentration of ethanol was 70%,the extraction time was 8 H,the extraction rate of crude polysaccharide from elm bark was 26.658%.The effects of three factors on the extraction rate of crude polysaccharide from elm bark were as follows:extraction temperature > extraction time >tio of anhydrous ethanol.