Related Experiment Video
Updated: Aug 9, 2026

Source and Route of Pyrrolizidine Alkaloid Contamination in Tea Samples
Published on: September 28, 2022
Changes in sensory characteristics, chemical composition and microbial succession during fermentation of ancient
Teng Wang1,2,3, Ruo-Yu Li1,2,3, Kun-Yi Liu4
1College of Tea Science & College of Food Science and Technology, Yunnan Agricultural University, Kunming, Yunnan 650201, China.
Abstract:
"Ancient tea plants" are defined as tea trees > 100 years old, or with a trunk diameter > 25 cm; their leaves are manufactured to high - quality, valuable ancient plants pu-erh tea (APPT). In this study, a fermentation of APPT were developed, and outstanding sweetness of APPT infusion was observed. During fermentation, the content of soluble sugars, theabrownins (p < 0.05), as well as 41 metabolites were increased [Variable importance in projection (VIP) > 1.0; p < 0.05 and Fold-change (FC) FC > 2]; While relative levels of 72 metabolites were decreased (VIP > 1.0, p < 0.05 and FC < 0.5. Staphylococcus, Achromobacter, Sphingomonas, Thermomyces, Rasamsonia, Blastobotrys, Aspergillus and Cladosporium were identified as dominant genera, and their relative levels were correlated with contents of characteristic components (p < 0.05). Together, changes in sensory characteristics, chemical composition and microbial succession during APPT fermentation were investigated, and advanced the formation mechanism of its unique quality.
More Related Videos
Related Concept Videos
Microbial Fermentation
Microbes in Food Production
Microbes in Beverage Production
Microbes in the Production of Fermented Foods
Microbial Spoilage of Food
Production of Organic Acids

