Relationship of turmeric and tamarind leaf extract ratio with induction time and antioxidant activity synergism

This study aims to determine the ratio of turmeric extract (TE) and tamarind leaf extract (TLE) which is suitable for the time of induction and the highest antioxidant synergism. The TE: TLE ratio examined is 10: 1; 10: 1.5 and 10: 2. The chosen variable is the amount of peroxide, observations carried out for 7 hours at one-hour intervals using ferric thiocyanate (FTC) method and thiobarbituric acid (TBA) method. The data than were made a graphic of the relationship between the time observations and absorbance, to show the induction time and synergism antioxidants. The results showed that all TE and TLE ratios had antioxidants that inhibited lipid oxidation reactions at the stage of initiation and propagation. TE and TLE ratios 10:1, 10:1,5 dan 10:2 have induction time, respectively 2.9577; 3.0206 and 3.1882 hours with FTC method, with the TBA method 3.6116; 3.706 and 3.8722 hours. Synergism antioxidant 103.534; 106.924 and 110.705%, with the FTC method, and with TBA 102.9393; 109.522 and 115.969%. The highest antioxidant synergism in both methods was shown by the ratio of TE:TLE = 10: 2.