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118 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYFigure 3. Oil partitioning collectedDrawing from the traditional medicinal knowledge in Vietnam, certain valuable wood species - such as pine, Cupressus torulosa, and Fokienia hodginsii - are known for their natural resistance to termites and borers. This resistance is often attributed to the presence of essential oil components that are denser than water, allowing dried wood samples to sink. Similarly, we observed that camphor wood exhibits comparable properties, with both lighter and heavier-than-water essential oil fractions. These findings suggest that the essential oil fractions from camphor wood are promising for further investigation into their potential applications. Accordingly, we proceeded to evaluate the biological activity of the extracted essential oil fractions.3.2. DPPH Radical Scavenging AssayThe two essential oil fractions collected by the circulating steam distillation method were evaluated for free radical scavenging activity by the DPPH method. After constructing the standard curve presented in the method section, we evaluated the test samples together with the positive control, quercertin. The results are presented in the following table:
