Composition Profile
Verified · 2026-09-25- 01Leaf-maturity metabolomic profileAcross Lu'an Guapian made from the first, second and third leaves below the bud, tea polyphenols, free amino acids and total flavonoids generally decreased as leaf maturity increased, while soluble sugars and total chlorophyll increased. Twenty-four differential compounds were identified.Dry-leaf sample
- 02EGCGThe first-leaf sample was significantly higher than the second- and third-leaf samples and was one of the key metabolites associated with stronger bitterness, astringency and taste intensity in the more tender material.Dry-leaf sample
- 03Chemical composition of laohuo “frost”The “frost” is a complex mixture containing caffeine, catechins, flavonoid glycosides, terpenes and other non-volatile and volatile substances.Other sample
Current evidence shows especially clearly that Lu'an Guapian chemistry changes with leaf position and maturity and with laohuo processing. Its “frost” is a complex mixture formed from the tea's own compounds under high heat, friction and related conditions.

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