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Research on the Changes of Aroma Compounds in Green Tea During Storage

Author: GuoJianHua
Tutor: LuoYaoPing
School: Zhejiang University
Course: Tea Science
Keywords: Headspace solid phase micro- extraction Volatile Aroma Temperature Humidity Alcohols Alkanes
CLC: TS272.51
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 0
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Abstract


Proven export tea store volatile substances in the process variation, the headspace solid phase micro extraction - extract tea volatile aroma components by GC determination the export tea store process, under certain conditions, green tea aroma dynamic variation analysis of the relationship between the various processing factors and aroma change. Content to fill the the the export tea aroma substances variation blank provides a theoretical basis for to accelerate green tea exports. The results show that: the slow green tea aroma change stored under ambient conditions, storage of representatives of substances after 2 months Not Found \At room temperature for two months after the new small molecule aldehydes the melon the aldehydes, cyclocitral, and n-butyraldehyde. Both short-term temperature, humidity treatment, storage, or some long-term temperature and humidity conditions, store, the more obvious effects of tea aroma. Tea after a certain temperature, humidity treatment inside the larger chemical changes were similar to the black tea fermentation and puer tea heap of damp heat process, with the fragrance of flowers, alcohol, reduced olefin substance, alkanes and furans increase. Long-term temperature and humidity treatment of the tea aroma significant impact, reduce alcohol aroma substance content after processing, alkanes increases. Process alcohol aroma substances content first decreased and then increased the trend to deal with 15-30 day class aroma substances to a minimum to 5-10% from 40% of the total aroma extract treatment 60 days rose to 10-25%. The alkanes aroma substances in the process trend of first increase and decrease after treatment 60 days after the alkanes content to 40-50% from 24% of the total aroma. Alkanes treatment only exacerbated long-term changes in the aroma substances, also advance to the state under room temperature storage, processing faster the higher the temperature changes, and 55 ° C, different water content processing tea samples reached room temperature storage for 60 days 45 days in advance level of aroma substances. The short-term temperature, moisture content deal with the long-term treatment had a significant impact on tea aroma, handling the higher the temperature, the higher the water content, the more obvious changes of tea aroma substances. Tea compared with room temperature storage, 40 ° C, 50 ° C, 60 ° C short-term treatment stored exacerbated by changes of aroma components, greatly reducing the time of the change. Stored at room temperature for 60 days, down to the aroma extract the total 34% alcohols stored for 30 days in 40 ° C short-term treatment that is reduced to the level of other short-term treatment after storage for 10 days down to that level, than at room temperature 50 days in advance. Status is stored at room temperature for 60 days, the alkanes tea rose to 12% of the total aroma, with different temperature and moisture content of the short-term treatment only stored for 30 days rose to the level of 30 days earlier than the room temperature. High temperature easy to generate furan, pyrazine, naphthalene Pyrotechnics fragrant caramel aroma substances, and the higher the temperature of the material generated earlier, 55 ℃ long-term deal with 15 days of such substances detected than 40 ° C the next 45 days. Short-term alcoholization dealing with the long-term temperature, humidity processing, as both had a greater impact on the tea aroma substances, accelerate changes in the aroma substances. Shows that by a certain temperature and moisture content of the short-term treatment can accelerate the export of tea quality changes, shortening the storage time and cost savings for green tea export enterprises. And due to its less energy and can be completed within one working day, the factory use of it possible.

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CLC: > Industrial Technology > Light industry,handicrafts > Food Industry > Beverage cold manufacturing industry > Tea > A variety of tea > Green tea
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