Study On The Aroma Of Hang White Chrysanthemum And Longjing Tea

The beverage chrysanthemum (Chrysanthemum morifolium Ramat.) flowers grown in Tongxiang, Zhejiang province is called Hangbaiju (white chrysanthemum of Hangzhou) which has been used as beverage for its refreshing aroma and taste since the ancient time. Now the Hangbaiju has been designated as a product of geographic feature, which producing area is limited in the field of Tongxiang city. However there is no substantial data to support this limit and for distinguishing the chrysanthemum products from Tongxiang and others. Ten beverage chrysanthemum flowers of different species grown in China were analyzed with GC-MS after simultaneous distillation and extraction treatment. The results showed the chrysanthemum grown in Tongxiang, Zhejiang province having its typical aroma composition as a famous product, which may reflect the geographical feature of the region.Dark tea is the fermented tea only produced in China.Owing to fermentation, polyphenols change into the unique functional components through fully automatic oxidation and chemical reaction by humid heat and microorganisms. The use of HPLC and HPLC-MS for the determination of polyphenols in content and catechin in structure of dark tea and other kinds of tea, the content of catechins in the dark tea is obviously different from other teas. Longjing tea, a traditional tea of China, is famous for its four distinct features-green leaf, fragrant, sweet, beautiful shape. The Longjing tea produced in different regions has characteristics in quality due to geographical environment and climate conditions. The comparison of the total amounts and the content of each component in six Longing teas was made, and the results showed that the aroma component in six Longjing teas were different with each other in total amount and content. The aromatic component in Longjing tea from Longjing village was the highest, and Qiantang and longwu was the lowest. There were18compunds detected in six kinds of teas in common, but differs in content. Characteristic compounds in each tes were detected.