Guaianolides and volatile compounds in chamomile tea.

Area of Science:

• Phytochemistry
• Analytical Chemistry
• Pharmacognosy

Background:

• Chamomile (Matricaria recutita L.) is a widely used medicinal herb in teas and folk medicine.
• Understanding its volatile chemical composition is crucial for quality control and therapeutic applications.
• Previous analyses focused mainly on the essential oil, not the volatile fraction of the infusion.

Purpose of the Study:

• To qualitatively and semi-quantitatively analyze the volatile constituents of chamomile herbal tea infusion.
• To compare the chemical profiles obtained through different extraction methods.
• To identify novel compounds in chamomile tea.

Main Methods:

• Isolation of volatile compounds using hydrodistillation and solid phase extraction (SPE).
• Analysis of isolated compounds using Gas Chromatography-Mass Spectrometry (GC-MS).
• Comparative analysis of chemical classes between essential oil and infusion extracts.

Main Results:

• Significant differences in volatile compound proportions were observed between chamomile essential oil and tea infusion.
• The infusion contained lower amounts of mono- and sesquiterpene hydrocarbons compared to the essential oil.
• Novel C-11 stereoisomers of guaianolides, typically found in Achillea species, were identified in chamomile tea for the first time.

Conclusions:

• The extraction method significantly impacts the detected volatile profile of chamomile tea.
• Chamomile tea infusion possesses a distinct chemical composition compared to its essential oil.
• The identification of new compounds highlights the complexity and potential of chamomile's medicinal properties.