Casearia sylvestris Essential Oil Degradation Products Generated by Leaf Processing

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacognosy

Background:

• Casearia sylvestris, a Latin American endemic tree, produces essential oil (EO) with known anti-inflammatory and gastroprotective properties.
• Understanding the chemical variability of C. sylvestris EO is crucial for its medicinal applications.

Purpose of the Study:

• To evaluate the chemical composition of essential oil from different processing stages (in natura, fresh, dried) of two C. sylvestris varieties (var. sylvestris and var. lingua).
• To investigate how leaf processing affects the volatile profile and identify potential chemical transformations.

Main Methods:

• Extraction and analysis of essential oil from in natura, fresh, and dried leaves of C. sylvestris var. sylvestris and var. lingua.
• Gas chromatography-mass spectrometry (GC-MS) was used to determine the chemical composition of the essential oils.

Main Results:

• Dried leaves yielded higher amounts of essential oil compared to fresh leaves for both varieties.
• The major components identified were (E)-caryophyllene, α-humulene, germacrene D, bicyclogermacrene, spathulenol, caryophyllene oxide, and humulene epoxide II.
• Leaf processing (drying and hydrodistillation) led to a decrease in sesquiterpene hydrocarbons and an increase in oxygenated sesquiterpenes, suggesting oxidation of bicyclogermacrene and (E)-caryophyllene.

Conclusions:

• The chemical composition of C. sylvestris essential oil varies significantly based on the plant variety and leaf processing methods.
• These compositional differences due to processing could influence the essential oil's biological activities, such as anti-inflammatory and gastroprotective effects.