Comparative functional analysis of papaya leaves at different developmental stages

Area of Science:

• Plant biochemistry
• Functional foods
• Metabolomics

Background:

• Papaya leaves are used in traditional medicine and as functional food.
• The relationship between papaya leaf development and its functional components is not well understood.
• Carpaine derivatives and γ-aminobutyric acid are of interest in the functional food industry.

Purpose of the Study:

• To analyze the chemical composition of papaya leaves at four developmental stages.
• To investigate the changes in carpaine derivatives and γ-aminobutyric acid during leaf maturation.
• To assess the proteolytic activity in relation to leaf development.

Main Methods:

• Non-targeted metabolomic analysis using liquid chromatography-quadrupole-time-of-flight mass spectrometry (LC-QTOF-MS).
• Multivariate statistical analysis to interpret metabolite profiles.
• Enzymatic assays to determine proteolytic activity.

Main Results:

• Carpaine derivative levels were highest in young leaves and decreased with maturity.
• γ-aminobutyric acid levels increased as the leaves matured.
• Proteolytic activity decreased with increasing leaf maturity.
• Metabolite profiles showed significant changes during the transition to the dark green leaf phase.

Conclusions:

• Papaya leaf composition varies significantly with developmental stage.
• Leaf selection should be based on the desired functional components for specific applications.
• Understanding these changes is crucial for optimizing the use of papaya leaves in functional foods and traditional medicine.