Abstract
The authors describe a new technique for the stabilization of the color of the complex α-α'-dipyridil-Fe II in the determination of α-tocopherol. EDTA is used for complexing the excess of the ions Fe III used in the reaction. The data are reproductible and the color is steady, which makes the process very sensible.
References
1. EMMERIE, A. & ENGEL, C. - Colorímetric determination of tocopherol (vitamin E). Ir. Adsorption experíments. Rec. Trav. Chim. 58:283-289, 1939.
2. TSEN, C.C. - An improved spectrophotomctríe niethod for the determination of tocopherols usíng 4,7-diphenyl-l,lO-phenanthroline. Anal, Chem. 33(7): 849-851, 1961.
3. COLLINS, P.F., DIEHL, H. & SMITH, G.F. - 2,4, 6-tripyridyl-s-triazine as a reagent for +ron. Determination of iron in limestone, silicates and refractories. Anal, oncm 31(11):1862-867,1959.
4. SNELL, F.D. & SNELL, C.T. - Colorimetric methods of analysis. 3. ed. New York, V~m Nostrand, 1949. v.2:316.
5. TETSUYA, T. - J. Chem. Soc. Japan, Pure Chem. Sect. 76 :336, 1955. (Apud TSEN, C.C. 2).
6. GLICK, D. ed. - Methods of biochemical analysis. New York, rnterscience, 1955. v.2.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 1962 Instituto Adolfo Lutz Journal