PENGARUH JENIS PELARUT TERHADAP RENDEMEN DAN AKTIVITAS ANTIOKSIDAN DALAM EKSTRAK MINYAK BEKATUL PADI (RICE BRAN OIL)

Agus Purwanto

Abstract


Abstract: Bran rice is a by-product of rice milling which only used as cattle feed. Utilization of
bran rice to take rice bran oil will increase its economic value. Rice bran oil contains natural
antioxidants -oryzanol and fatty acids. Antioxidants -oryzanol are more powerful than vitamin
E to avoid free radical damage. One way to recovery rice bran oil is extraction using volatile
solvents. The effects of solvent type to yield of rice bran oil and antioxidant activity of rice bran
oil need to be researched. This study started with the process of stabilization of bran to inhibit
lipase activity. Next process was extraction of bran oil using n-hexane, ethyl acetate, and
ethanol as the solvent. The next step was evaluation the acid number and antioxidant activity of
obtained oil with DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The results showed that the
yields of oil were affected by solvent polarity compounds. Highest yield was obtained on
extraction using ethanol and the yield was 12.553%, 14.105% and 17.431%. Acid test showed
that extraction using ethyl acetate produced oil with smallest acid number (79.662 and 90.882)and test of antioxidant activity showed that extraction with ethanol was potential as antioxidants
which value of IC
50
were 46.79% and 47.29%.
Keywords: bran, extraction, solvent type, antioxidants, DPPH


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DOI: http://dx.doi.org/10.20961/ekuilibrium.v13i1.2152

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