The caffeine content does not show a significant trend of increase or decrease with increasing storage time, which was due to the stable structure of the purine ring of caffeine [ 33 ]. 3.2.4.
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A Comprehensive Investigation of Macro-Composition and Volatile Compounds in Spring-Picked and Autumn-Picked White Tea.
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The content of the water-extractable substance showed a decreasing trend with increasing storage years, which is similar to previous studies [ 45 ]. 3.2.2.