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The various benefits contained in eucalyptus oil such as respiratory tract treatment, respiratory sedative, as well as the potential to inhibit Covid-19 infection, often attract the attention of some producers to produce eucalyptus oil regardless of its quality and purity. The combination of the FTIR spectroscopy method with a combination of chemometrics is one solution to overcome this problem. The combination of the FTIR spectroscopy method with chemometrics is proven to be able to easily analyze sample quality, does not involve excessive solvents and reagents, is also effective against time so as to make it easier to authenticate the content of eucalyptus oil to authenticate eucalyptus oil content. In this study, researchers used turpentine as a control variable which is commonly found in cajuput oil as an adulterant. Eucalyptus oil samples will be added to turpentine with varying concentrations 0-10% (v/v) (0.5 interval), then FTIR and chemometrics analysis will be carried out quantitatively and qualitatively. The purpose of this study was to obtain distinctive characters from the spectrum of samples containing turpentine and obtain results from multivariate analysis using Principal Component Analysis (PCA) as a qualification method as well as obtain Partial Least Square (PLS) models as quantification methods

Eucalyptus Oil; Terpentine; FTIR; Chemometrics; PLS; PCA