Studies On Preparation Process Of Oolong Tea Tablets

This article mainly introduces the effect of tea polyphenol and caffeine in tea,the extraction methods and the research status of determination methods.Based on the previous work,the extraction processes of caffeine and tea polyphenols in Fujian oolong tea were studied.The preparation technology of oolong tea tablets was explored.Indicators such as hardness,moisture and ash content of oolong tea tablets were tested.The quality standard of the oolong tea tablets was established,preliminary the stability of oolong tea tablets was discussed.Specific work is as follows:Take Fujian oolong tea as the research object,caffeine,Tea polyphenols and dry paste yield were studied as determination index in the extraction processes.The content of caffeine,tea polyphenols and dry paste were compared after hot reflux method,soxhlet extraction method,microwave extraction,ultrasonic extraction and ultrasonic-microwave synergistic extraction.It was confirmed that ultrasonic-microwave synergistic extraction afforded the highest yield and was verified to be a time saving,efficient and strong-reproducibility method.It combines the advantages of ultrasonic and microwave,which have higher extraction efficiency than others.Then the single factor tests and orthogonal test were carried out for ultrasonic-microwave synergistic extraction.The results indicated that the optimum extraction technology of microwave power,microwave time,extraction temperature,liquid-solid ratio are 500 W,4 min,80? and 20:1,respectively.After using ultrasonic-microwave synergistic extraction as the extraction method for Fujian oolong tea,the content of caffeine and tea polyphenols were determined by using ultraviolet and visible spectrophotometer.The determination methods were refered to National Standard Methods,which were the version of 2002 and 2010,respectively.Determination results demonstrated that the content of caffeine and tea polyphenol in oolong tea are 25.6,302.9 mg·g-1,respectively.The preparation of tea tablets was studied.The influence of different kinds and dosages of excipients for tablets molding process were examined.Added supplementary materials to drying concrete obtained from oolong tea extractive.Through optimization processes of a series of parameter,tablets which have the effect of refreshing,qing yan li hou were prepared sucessfully.Finally,the formula of WuLongCha Tablets we got is the amout of tea extractive is 15 g,the ratio of starch and lactose is 2 to 1 and total weight is 30 g and mint's amout is 1 g and aspartame is 1 g and Magnesium stearate is 1 g and the right amout of starch slurry was as binding agent.The total weight is about 50 g which were made into 100 pieces.On the study of quality standards of the tablet,a series of tests were carried out,mainly to the ash contents,heavy metal tests,hardness tests,water tests,weight difference detection.By using high performance liquid chromatography(HPLC)and spectrophotometer,contents of caffeine and tea polyphenols were determined.Results showed that tea tablets in conformity with the quality standards for tablets.It is a convenient,effective and new way to eat the tea.Also the tea draft standards on the quality of tablets were established.Based on the tests of influence factors,the stability of tea tablets were measured preliminary.The results verified that oolong tea tablets are basically stable.