Related Experiment Video
Updated: Jan 29, 2026

Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique
Published on: May 26, 2023
From Fresh Leaves to Tea Infusion: Investigating the Origins, Key Variables, and Sensory Impact of
Meng Tao1, Sixu Li1,2, Qinyan Yu1
1Institute of Sericulture and Tea, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P. R. China.
Abstract:
This study investigated methoxypyrazines (MPs) in green tea infusions using solid-phase microextraction (SPME) and stable isotope dilution assay (SIDA) to extract and quantitate. Quantitative results showed that MPs (IPMP, SBMP, and IBMP) originated from fresh leaves and decreased gradually during processing. Stems of new shoots had the highest MPs levels, which declined from the first to fourth leaf, and shading increased MPs in older leaves. Quantification of relevant amino acids showed that MPs were strongly correlated with glycine, valine, and isoleucine. In 21 green tea infusions, IBMP appeared in 20 samples (average 2.38 ng/L, max 6.35 ng/L), while IPMP and SBMP were rarer. Addition tests confirmed that IBMP above 10 ng/L caused a strong green pepper off-flavor, but at lower levels (2 and 5 ng/L), it enhanced the green tea's top note and green aroma. Overall, the study demonstrates that parts per trillion level MPs significantly affected green tea aroma, providing insights for processing and quality control.
More Related Videos
Related Concept Videos
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
What is a Sensory System?
Leaving Groups
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.
In a...
Key Elements for Plant Nutrition
Key Techniques in Microbiology
Alkyl Halides
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...

