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AbstrakPenelitian ini dilakukan untuk evaluasi cemaran lemak babi pada minyak goreng nabati dengan menggunakan metode polarisasi transmisi. Sampel yang digunakan adalah minyak goreng sawit yang telah terkontaminasi minyak ayam dan minyak babi, dengan variasi kandungan minyak ayam dan minyak babi. Sumber cahaya yang digunakan adalah laser hijau dengan panjang gelombang 532 ± 10 nm. Pengukuran dilakukan dengan mengamati perubahan sudut polarisasi transmisi yang terjadi ketika tanpa diberikan medan listrik luar dan dengan pemberian medan listrik luar yang dihasilkan dari dua plat tembaga yang diberikan tegangan 0-6 kV. Hasil pengujian menunjukan minyak goreng sawit yang terkontaminasi dengan minyak babi memiliki perubahan sudut polarisasi yang paling besar dibandingkan dengan minyak goreng sawit murni dan minyak goreng sawit yang telah terkontaminasi dengan minyak ayam. Hal tersebut dikarenakan kandungan asam lemak jenuh pada minyak babi lebih besar daripada minyak goreng sawit murni dan minyak ayam. Dengan hasil tersebut, metode polarisasi transmisi diharapkan dapat menjadi metode untuk evaluasi kehalalan minyak goreng. Kata kunci: Polarisas transmisi, Elektrooptis, Minyak Goreng, Cemaran Lemak Babi, Halal Abstract This research was conducted for evaluation of contamination of pig fat on vegetable cooking oil using transmission polarization method. The sample used is palm oil that has been contaminated with chicken oil and pork oil, with variations of chicken oil and pork oil content. The light source used is a green laser with a wavelength of 532 ± 10 nm. Measurements are made by observing the change in the transmission

In this paper we studied contribution of electro-optics effect for evaluation of canola oil quality using transmission and fluorescence polarization. The samples were two different quality of canola oils, i.e. edible canola and expired canola based on the date of expiration at the time of measurement. The physical variable of polarization angle was measured using a pair of polarizers from a 532 nm of green pointer laser. The electro-optics effect was produced by applying high DC voltage 0-9 kV on samples. The result shows that the change of polarization angle of expired oil is greater than the good one for both transmission and fluorescence. The increasing polarization angle is accompanied by increasing saturated FAs and decreasing polyunsaturated FAs simultaneously, in agreement with our previous reports.The fluorescence polarization is dependent on the polarizer’s angle of incoming light and has average angle greater than transmission light. The electro-optic fluorescence is twice as electro-optics transmission due to possibly coupling between pure scattering and fluorescence together, in which large size of TG molecules play an important role into the light scattering and fluorescence perpendicular to the incoming light.This fluorescence light method provides more accurate measurement that transmission light and seems powerful comparison to the other spectroscopy methods.