Comprehensive Utilization Of Tea Residue Deep Processing And Process Research Of Chewable Tablets

The consumptions of medium and low-range tea in China are mainly based on the soaking of loose tea,which are supplemented by raw materials of tea polyphenols(TP)and tea polysaccharides(TPS).Most tea leaves(called tea residue)that have been extracted from tea polyphenols and tea polysaccharides are discarded as iste.If tea slag can be properly modified to enhance the value,high-value-added products are to be produced.What's more,comprehensive utilization of middle and low-range tea can not only help improve economic efficiency,but also save resources.In this experiment,middle and low-range green tea,black tea,and Pu'er tea are used as raw materials to study the optimal ultrasonic extraction technology of TP and TPS,the optimal process for tea slag extrusion modification,and the effect of the hydration characteristics tea residue.After the extrusion modification,the antioxidant capacity of the crude tea slag polysaccharides and the optimal formulation of the tea residue dietary fiber chewable tablets are used to complete the comprehensive utilization of the three middle and low range teas.The main research results are as follows:(1)Using green tea,black tea,and Pu'er tea as raw materials,continuous extraction of tea polyphenols(TP)and tea polysaccharides(TPS)is carried out by ultrasonic extraction.After comprehensive analysis,the optimal extraction parameters for the three types of tea are determined as follows: Raise the temperature 70°C;dip the ratio of material to liquid 1:25;ultrasonic power 175W;extraction time 60 min.With the optimal parameters for the extraction process,the extraction rates of green tea TP and TPS are 20.32% and 8.26%,respectively;the extraction rates of black tea TP and TPS are 10.31% and 5.28%,respectively;the extraction rates of Pu'er tea TP and TPS are 4.57% and 4.58%,respectively.(2)The optimum extrusion modification conditions for green tea and black tea slag are: screw speed 630 r/min,moisture content 28%(w/w),particle size 20 mesh;the optimum extrusion modification conditions of Pu'er tea slag are screw speed 540 r/min,water content 40%(w/w),particle size 20 mesh.Under the above extrusive conditions,the discharge rates of green tea,black tea,and Puer tea slag are individually 85.23%,82.19% and 43.87%.The content of WSP(Water-soluble polysaccharides)in green tea,black tea and Pu'er tea residue after secondary extrusion is 5.33%,4.63% and 5.12%,respectively.The WSP content in three kinds of tea residues is compared with unpressed tea residue.Have a greater degree of improvement.The water-solubility,water holding capacity and expansive force of the tea residue increased by 64.71%,16.67%,and 52.38%,respectively.The water solubility and expansibility of the green tea residue increased by 7.41% and 17.86% respectively,and the water solubility of the tea residue improved by 86.21%.(3)The antioxidant activity of three kinds of tea residue WSP is relatively higher: Pu'er tea residue WSP has stronger DPPH free radical scavenging ability.When its concentration get 2 mg/mL,DPPH radical scavenging rate reached the highest,with being 70.13% Black tea slag WSP followed,and green tea residue WSP is the weakest,with both getting the highest clearance rates of 73.14% and 71.24% respectively,when the concentration is 6 mg/m L;Pu'er tea residue WSP had the highest hydroxyl radical scavenging rate of 67.95 %,and black tea residue WSP followed,with the highest clearance rate 56.79%,green tea residue is the weakest,the highest clearance rate is 41.59%;from the overall trend,Pu'er tea residue WSP had the strongest ability to remove superoxide anion,followed by black tea slag WSP,green tea residue WSP The weakest,the highest clearance rate are 38.23%,35.58%,35.04%;Pu'er tea residue WSP had the strongest ability to reduce iron ions,the maximum absorbance value is 2.442,followed by black tea slag WSP,the maximum absorbance value is 2.349,green tea residue WSP most Weak,maximum absorbance is 2.034.(4)The best formula of green tea residue dietary fiber chewable tablets: ratio of tea residue to maltodextrin 1:2,microcrystalline cellulose 25%,citric acid content 1.0%,xylitol content 25%;black tea meal The best formula for fiber chewable tablets: ratio of tea residue to maltodextrin 1:1,microcrystalline cellulose 20%,citric acid content 1.0%,xylitol content 25%;it would be the best formula for Puer tea scoria dietary fiber chewable tablets : The ratio of tea residue to maltodextrin is 1:2,microcrystalline cellulose 20%,citric acid content 1.0%,and xylitol content 20%.