Simplified analysis of flavanols in matcha tea

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Phytochemistry

Background:

• Matcha tea, a finely ground powder of tea leaves, contains flavanols, beneficial plant compounds.
• Accurate analysis of flavanols in matcha is crucial for quality control and health studies.
• Existing methods, like ISO 14502-2, can be complex and time-consuming for matcha's unique composition.

Purpose of the Study:

• To develop and validate a simplified, rapid extraction protocol for flavanol analysis in matcha tea.
• To compare the efficacy of simplified methods against the standard ISO 14502-2 protocol.
• To provide a time- and energy-efficient alternative for flavanol quantification in matcha.

Main Methods:

• Screening of 21 simplified extraction protocols for flavanol analysis.
• Utilizing High-Performance Liquid Chromatography (HPLC) for flavanol quantification.
• Validation of the chosen simplified method for accuracy and repeatability (intraday and interday).

Main Results:

• Five simplified extraction methods yielded results comparable to the ISO 14502-2 method.
• The optimal simplified method involved ethanol + water (7+3, v+v) extraction at room temperature with ultrasonication.
• The validated method demonstrated accuracy and repeatability when applied to various matcha and powdered green teas.

Conclusions:

• A simplified, rapid extraction protocol using ethanol-water and ultrasonication is effective for matcha flavanol analysis.
• This method offers significant time and energy savings compared to conventional techniques.
• The validated protocol facilitates more accessible and efficient flavanol quantification in matcha tea.