Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengetahui secara kualitatif perbedaan spektrum Near Infrared Spectroscopy (NIR) dan Fourier Transfer Infra Red (FTIR) spektroskopi minyak nilam secara geografis serta pengaruh penambahan rasio zeolit dan bentonit terhadap komposisi kimia minyak nilam. Minyak nilam yang digunakan pada penelitian ini berasal dari kecamatan Babahrot dan Kecamatan Kuala Batee Kabupaten Aceh Barat Daya Provinsi Aceh. Karakterisasi spektrum NIR dan FTIR minyak nilam murni dan minyak nilam yang divariasikan dengan zeolit dan bentonit (0,5; 1; 1,5; 2; 2,5 g) dianalisis menggunakan analisis multivariat kemometri dengan model Principal Component Analysis (PCA) dan Partial Least Square Discriminant Analysis (PLS-DA). Hasil penelitian menunjukkan secara geografis tidak terdapat perbedaan spektrum NIR maupun FTIR pada sampel minyak nilam sebelum dan setelah penambahan adsorben, yang ditandai dengan pola spektrum yang mirip satu sama lainnya. Penambahan zeolit dengan spektrum NIR dan bentonit dengan spektrum FTIR berpengaruh terhadap komposisi kimia minyak nilam ketika dianalisis dengan analisis multivariat PCA dan PLS-DA. Secara keseluruhan penambahan adsorben bentonit memberikan pengaruh lebih besar terhadap karakteristik sifat fisika dan kimia minyak nilam.

Kata kunci: Minyak nilam, Zeolit, Bentonit, NIR, FTIR, PCA, PLS-DA

This study aims to qualitatively determine the geographical differences between the NIR spectrum and the FTIR spectrum of patchouli oil and the effect of adding the ratio of zeolite and bentonite to the chemical composition of patchouli oil. Patchouli oil used in this study came from Babahrot and Kuala Batee, Southwest Aceh. The characterization of the NIR and FTIR spectra of pure patchouli oil and patchouli oil varied with zeolite and bentonite (0.5; 1; 1.5; 2; 2.5 g) were analyzed using chemometric multivariate analysis with Principal Component Analysis (PCA) and Partial models Least Square Discriminant Analysis (PLS-DA). The results showed that geographically there were no differences in the NIR and FTIR spectra of patchouli oil samples before and after the addition of the adsorbents, which were characterized by similar spectral patterns to each other. The addition of zeolite with NIR spectrum and bentonite with FTIR spectrum affected the chemical composition of patchouli oil when analyzed by multivariate analysis PCA and PLS-DA. Overall, the addition of bentonite adsorbent has a greater influence on the physical and chemical characteristics of patchouli oil. Keyword: Patchouli Oil, zeolite, bentonite, NIR, FTIR, PCA and PLS-DA