Abstract
Spectrophotometric determination of unsaturated fatty acids of coffee oil was carried out according to the American Oil Chemists' Society method. The average results obtained from two samples were: linoleic acid, 39.86-39.38%; linolenic acid, 0.84-1.41 %; conjugated diene, 1.08-1.01 %; conjugated triene, 0.06-0.08%; oleic acid, 17.03-12.20%; saturated acids, 33.83-34.25%. The presence of linolenic acid among the fatty acids of coffee oil was evidenced. The following chemical and physical characteristics were also determined: refractive index at 40oC, saponification value, iodine value, modified Bellier value, M. P. of fatty acids, S. P. of fatty acids (Titer), unsaponifiable matter and squalene.
References
1. REWALD, B. - The phosphatídes and oil in unroasted and roasted coffee beans. Oil & Soap 23(1) :19-20, 1946.
2. BENGIS, R. O. -:- Oxidation of fat fractíon of roasted coffee. Ind. Eng. Chem. 28:290-293, 1936.
3. SLOTTA, C.H. & SZYSZKA, G. - O café sob o ponto de vista químico. 3. Uso do café no preparo de sabão ou óleo comestível. Mem. Inst. Butantan 11: 55-60.
4. ECKEY, E. W. - Vegetable fats and oils, with a chapter by Lawrence P. Miller. New York, Reinhold, 19 54. (Am. Chem. Soc.Monograph Series n. 123). p. 760.
5. JAMIESON, G. S. - Vegetable fats and oils: their chemistry, production and utilization for edible, medicinal and technical purposes. 2. ed. New York, Reinhold, 1943. (Am, Chem. Soc. Monograph Series n. 58). v. 1:58.
6. AMERICAN OIL CHEMISTS' SOCIETY - Official and tenta tive methods. 2. ed. Chicago, A.O.C.S., 1946.
7. ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS - Official methods of analysis. 9. ed. Washington, A.O.A.C., 1960.
8. INSTITUTO ADOLFO LUTZ - Métodos de análises bromatológicas. I. Análises químicas. S. Paulo, Rev. Tribs., 1951.
9. SCHWETTE, H.A., COWLEY, M.A. & CHANG, C.Y. - The caracteristics and oompositíon of coffee oil. The caracteristics and composition of corfee bean oil. J. Am. Chem. SOC.56: 2085-86,1934.
10. BENGIS, R. O. & ANDERSON,R. J. - The chemistry of the coffee-bean. 11. Composition of the coffee-bean oil. J. Biol. Chem. 105:139-151,1934.
11. GAROGLIO, P. G. - Tecnologia de los aceites vegetales con especial referencia al aceite de olíva. Mendonza, Universidad Nacional de Cuyo, 1950. V. 1: 1024.
12. MITCHEL, J.H., Jr., KRAYBILL, H.R. & SZCHEILE, F. P. Quantitative spectrum analysis of fats. Ind. Eng. Chem. (Anal. Ed.) 15:1-3, 1943.
13. BEADLE, B.W. & KRAYBILL, H.R. - Spectrophotometric analysis of fats. J. Am. Chem. SOC.66:1232, 1944.
14. BAUER, K. H. & NEU, R. - Coffee oil. Fette U. Seifen 45:229-232, 1938.
15. SUBRAHMANYAN,V. & ACHAYA, K. T. - Lesser known indian vegetable fats. J. Sci. Food Agr. 8:657-662, 1957.
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