A PROPOSED MODIFICATION OF EMMERIE'S IRON-DIPYRIDYL METHOD FOR DETERMINING THE TOCOPHEROL CONTENT OF OILS

Abstract

By treating a petrol ether solution of wheat-germ oil with 85% sulphuric acid, centrifuging, and washing the supernatant petrol ether with dilute alkali, carotenoids and other substances that interfere with the iron-dipyridyl method for determining tocopherol are removed. Tocopherol is not affected by the treatment. The tocopherol content of the solution is finally determined by a modification of Emmerie's method.