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Non-Volatile Metabolic Reprogramming and Sensory Evolution of Anhua Qianliang Tea During Long-Term Storage
Mengzhen Xia1,2,3, Zhichao Lin1,2,3, Meihui Huang1,2,3
1Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha 410128, China.
Aging Anhua Qianliang tea transforms its quality through metabolic changes. Key metabolites like polyphenols and amino acids decrease, while others like phenylpropanoids and lipids change, impacting sensory properties and tea maturation.
Area of Science:
- Food Science
- Analytical Chemistry
- Metabolomics
Background:
- Anhua Qianliang tea is a dark tea valued for aged sensory qualities.
- Understanding the chemical changes during aging is crucial for quality control.
Purpose of the Study:
- To identify the key metabolites and metabolic pathways responsible for quality changes in aged Anhua Qianliang tea.
- To correlate chemical transformations with sensory evolution during tea maturation.
Main Methods:
- Physicochemical analysis of tea samples aged 2-25 years.
- Untargeted metabolomics for comprehensive metabolite profiling.
- Sensory evaluation to assess organoleptic properties.
Main Results:
- Prolonged aging decreased total polyphenols, free amino acids, and catechins, while alkaloids remained stable.
- Phenylpropanoids, polyketides, organic acids, and lipids were key discriminators between aging stages.
- Significant metabolic remodeling occurred in flavonoid, phenylpropanoid, and carbon metabolism pathways.
Conclusions:
- Metabolic shifts, particularly in phenylpropanoids, lipids, and organic acids, drive the maturation of Anhua Qianliang tea.
- Sensory changes are linked to alterations in catechins, polyphenols, phenolic acids, and amino acid-related compounds.
- These findings enhance the understanding of dark tea aging and support industrial standardization.
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