| Choosing heating temperature, heating time and heating times as factors, and rapeseed oil without TBHQ as contrast, the effect of TBHQ on the quality of rapeseed oil during heating process was studied by measuring the acid value, peroxide value and sensory evaluation of the oil samples. The results showed that when the heating temperatures were 140, 160, 180, 200, 220?℃ and heating time was 0.5 h,the addition of TBHQ could obviously reduce the peroxide value of rapeseed oil(P=0.0118), but it didnt have obvious effect on the acid value. When the heating temperature was 180?℃ and heating time was 0.5,1,1.5,2,2.5 h, the addition of TBHQ could extremely and significantly reduce the peroxide value of rapeseed oil(P=0.003 6), but it didnt have obvious effect on the acid value. When the heating process conditions were 200?℃, 0.5 h and 2-3 times, the peroxide value of rapeseed oil without TBHQ exceeded the limit of national standard of first grade rapeseed oil, while it was in required range in rapeseed oil added with TBHQ. In the experiment, the addition of TBHQ didnt have obvious effect on the sensory quality of rapeseed oil. |
