Composition Profile
Verified · 2026-09-26- 01Metabolite profiles of Qingzhuan from different yearsAcross five production years, 189 characteristic compounds were identified and 26 key differential metabolites screened. Eight catechin monomers declined with increasing storage age, seven flavonoids first rose and then fell, while caffeic acid, lactobionic acid, linolenic acid, theophylline, betaine and other compounds increased with age.Dry-leaf sample
- 02Qingzhuan aroma profileSeventy-two aroma compounds were identified across 16 representative Qingzhuan samples. Compounds with relatively high abundance included hexanal, linalool, nonanal and toluene, while aldehydes and ketones were major aroma classes.Dry-leaf sample
Aged, fungal and woody aroma impressions are associated with the combined contribution of multiple aldehydes, ketones, linalool oxides, camphor, ionones and other volatiles.
As storage years increase, catechins, flavonoids and some alkaloids and organic acids move in different directions. Volatile research further shows that aldehydes, ketones, linalool and related compounds jointly contribute to aged, fungal and woody aroma impressions.

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