| Taking fresh tea of Fuding Dahaocha,using the technologies exogenous enzyme to improve the quality of white tea,screening factors and the level of cellulase,pectinase and papain;throughing combinations of enzyme preparations on raw materials of white tea for processing,the quality of white tea improved obviously;using the fuzzy comprehensive evaluation to analysis the biochemical quality of white tea objectively,and calculate the concrete index and multiplicity of weight:tea polyphenols:0.2260,amiono acids:0.2494,flavonoes:0.0328,saccharides:0.0830,water extract:0.3460 and caffeine:0.0624.article also tried other tea varieties,high arom productions of white tea,and to optimize the process,the best varieties and process.The main results showed as follows:(1)In spring Fuding Dahaocha materials,by orthogonal experiment analysis of cellulase,pectinase and papain researched biochemical composition and quality of white tea in spring.the determination results of water extract and saccharides had increased,which had proved a the cellulase decomposeing cell wall cellulose and improving water extract,and promoting content of saccharides.Pectinase and cellulase had the same effect.The orthogonal test of papain showed that improve amino acid content by papain.The outcome of the review,in the weight loss rate of 60%of the withering leaves sprayed with 1.5%cellulase,the ratio of liquid and leaves is 1:4,which is the total score of 14.7 points higher than the control;in the weight loss rate of 30%of the withering leaves sprayed with 1.5%pectinase,the ratio of liquid and leaves is 1:8,which is the total score of 10.9 points higher than the control:in the weight loss rate of 60%of the withering leaves sprayed with 1.5%cellulase,the ratio of liquid and leaves is 1:4,which is the total score of 7.5 points higher than the control.(2)In summer.Fuding Dahaocha materials,analyses the influence of pectinase and tannase to the quality of white tea in summer by two-factor experiment.As a result,it shows that 1.0%pectinase spraying water loss rate of 30%of the withering leaves,the ratio of liquid and leaves is 1:10,which is the best quality;in fresh leaves sprayed with 1.0%tannase,the ratio of liquid and leaves is 1:10,which is the best quality.The article used the summer Fuding Dahaocha as the raw materials,ditierent concentrations of cellulase treatments.decreased crude fiber content obtained cellulase could promote the decomposition of crude fiber of cell wall to prove that the cellulase can destructe the cell wall tissue of tea.(3)Based on enzyme combination test to and analysis biochemical contents.which could enhance the treatment effect and impove the water extracts,amino acids and saccharides,and the biochemical composition of significant or extremely significant between the biochemical composition of tea by the enzyme treatments.(4)The article also tried producing white tea by other high fragrant varieties of tea,through the evaluation results show that Huangguanyin's score was 3.7 points higher than Fuding Dahaocha.On the further carrying out optimization of white tea of Huangguanyin,score of the white tea of Huangguanyin with combined-withering was higher 5.2 points than natural-withering.Making white tea by Huangguanyin,whose quality was best,and aroma substances in a high total,the total was 2.01times than the control.The white tea of Huangguanyin contains 10-Undecyne of fragrant with coconut,and other species were detected.The Citral with lemon is 85.71%higher than the control.On the futher carred out optimization of white tea of Huangguanyin,the white tea of Huangguanyin of embined-withering had much aroma and was persistence.whose total aroma is higher 1.17 times than the natural-withering.The Z-Nerol of roses,the ?-Farnesene with the faint scent and the Caryopyllene with a woody aroma compinents relative contents were higer 60.45%.45.28%.27.13%than the control.and the contents of Esters and Aldehydes were much and better. |
PDF Full Text Request