AUTENTIKASI MINYAK BUAH ALPUKAT (Persea americana Mill) DALAM CAMPURAN DENGAN MINYAK JAGUNG DAN MINYAK WIJEN MENGGUNAKAN KOMBINASI SPEKTROFOTOMETER FTIR DAN KEMOMETRIKA

Avocado oil is a functional oil which has many beneficial effects to human health. Because of its advantages, avocado oil has a high price compared with other edible vegetable oil which reaches 15-20 times higher for its price. Due to its high price of avocado oil illegal practice will possibly occur, such as falsification of avocado oil to get more economical profit. So, an analytical method is needed to detect oil falsification fast, accurately, reproducibly, and environmental friendly. Fourier transform infrared (FTIR) spectroscopy which is combined with chemometric technique is a developed method for authentication of avocado oil from its adulterant. Both avocado oil in binary and ternary mixture with corn oil and sesame oil were scanned with infrared spectrophotometer with attenuated total reflectance (ATR) sample handling technique. Wave number optimization was done at differentiator region among the three oil. Chemometric calibration model, principal component analysis (PCA), partial least square (PLS), and principal component regression (PCR) were done at selected wave number on optimization process. Based on highest values of R2 and lowest values of RMSEC (root mean square error of calibration) the FTIR normal spectra that coupled with PLS at wave number combination 3035-2881 cm-