Standardization of Euphorbia tithymaloides (L.) Poit. (Root) by Conventional and DNA Barcoding Methods

Area of Science:

• Pharmacognosy
• Molecular Biology
• Botany

Background:

• Medicinal plant adulteration and substitution are significant issues.
• Euphorbia tithymaloides is a valuable medicinal plant often misidentified.

Purpose of the Study:

• To conduct a conventional and molecular pharmacognostic study for accurate identification of Euphorbia tithymaloides root.
• To establish quality standards for E. tithymaloides to ensure purity and quality.

Main Methods:

• Macroscopic and microscopic examinations of the root.
• Physiochemical and phytochemical analyses (phenols, alkaloids, flavonoids).
• DNA extraction, amplification (rbcL, matK, ITS primers), sequencing, and BLAST analysis.
• Phylogenetic tree generation using MEGA 6 software.

Main Results:

• Microscopic studies revealed characteristic cellular structures; physiochemical properties were within limits.
• Phytochemical analysis indicated the presence of terpenoids, flavonoids, saponins, and alkaloids, with high alkaloid content in ethanol extract.
• DNA barcoding showed high similarity (99.83-100%) with GenBank sequences; matK loci demonstrated high similarity, suitable for standalone identification.

Conclusions:

• The combined pharmacognostic and DNA barcoding approach provides a reliable method for identifying Euphorbia tithymaloides root.
• The matK DNA barcode is effective for the accurate identification of E. tithymaloides.
• The study results can aid in setting quality standards for this important medicinal plant.