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The constituents of “chufa” oil, a fatty oil from the tubers of cyperus esculentus linne
N O T E S FROM T H E U. S. B U R E A U
OF CHEMISTRY.*
T H E C O N S T I T U E N T S O F " C H U F A " OIL, A F A T T Y O I L FROM T H E T U B E R S OF C Y P E R U S E S C U L E N T U S L I N N E . 1 By Walter F. Baughman and George S. Jamieson.
[ABST~Cr.I THE chemical composition of the oil obtained from domestic chufa tubers has been determined with the following results: Glycerid of myristic acid, trace. Glycerid of palmitic acid, II.8 per cent. Glycerid of stearic acid, 5.2 per cent. Glycerid of arachidic acid, 0.5 per cent. Glycerid of lignoceric acid, 0.3 per cent. Glycerid of oleic acid, 73.3 per cent. Glycerid of linolic acid, 5.9 per cent. N o n - f a t t y material (by difference), 3.0 per cent. A phytosterol (m. p. 134-135 ° C.) was isolated from the unsaponifiable material.
The more important chemical and physical characteristics are the following: Specific gravity 25o/25 ° . . . . . . . . . . . . . . . . . Refractive index, 20 ° . . . . . . . . . . . . . . . . . . . . Iodin number ( H a n u s ) . . . . . . . . . . . . . . . . . . Saponification value . . . . . . . . . . . . . . . . . . . . . Unsaponifiable m a t t e r (per cent.) . . . . . . . . . Acid value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Acetyl value . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reichert-Meissl number . . . . . . . . . . . . . . . . . Polenske number . . . . . . . . . . . . . . . . . . . . . . . . Saturated acids, per cent. (observed) . . . . . . Unsaturated acids, per cent. (observed) . . . . Saturated acids, per cent. (corrected) . . . . . . U n s a t u r a t e d acids, per cent. ( c o r r e c t e d ) . . . Iodin number of unsaturated acids . . . . . . . .
o.912o 1.468o 76.5 191. 5 0.6 15.7 lO.5 0.2 0.3 18.3 (Iodin number 6.5) 74.6 I7.I 75.8 96. 9
* Communicated by the Chief of the Bureau. 1 Published in J. Agr. Research, 26 (Oct. 13, 1923) : 77. VOL. 197, No. 1188--39
559
OF CHEMISTRY.*
T H E C O N S T I T U E N T S O F " C H U F A " OIL, A F A T T Y O I L FROM T H E T U B E R S OF C Y P E R U S E S C U L E N T U S L I N N E . 1 By Walter F. Baughman and George S. Jamieson.
[ABST~Cr.I THE chemical composition of the oil obtained from domestic chufa tubers has been determined with the following results: Glycerid of myristic acid, trace. Glycerid of palmitic acid, II.8 per cent. Glycerid of stearic acid, 5.2 per cent. Glycerid of arachidic acid, 0.5 per cent. Glycerid of lignoceric acid, 0.3 per cent. Glycerid of oleic acid, 73.3 per cent. Glycerid of linolic acid, 5.9 per cent. N o n - f a t t y material (by difference), 3.0 per cent. A phytosterol (m. p. 134-135 ° C.) was isolated from the unsaponifiable material.
The more important chemical and physical characteristics are the following: Specific gravity 25o/25 ° . . . . . . . . . . . . . . . . . Refractive index, 20 ° . . . . . . . . . . . . . . . . . . . . Iodin number ( H a n u s ) . . . . . . . . . . . . . . . . . . Saponification value . . . . . . . . . . . . . . . . . . . . . Unsaponifiable m a t t e r (per cent.) . . . . . . . . . Acid value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Acetyl value . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reichert-Meissl number . . . . . . . . . . . . . . . . . Polenske number . . . . . . . . . . . . . . . . . . . . . . . . Saturated acids, per cent. (observed) . . . . . . Unsaturated acids, per cent. (observed) . . . . Saturated acids, per cent. (corrected) . . . . . . U n s a t u r a t e d acids, per cent. ( c o r r e c t e d ) . . . Iodin number of unsaturated acids . . . . . . . .
o.912o 1.468o 76.5 191. 5 0.6 15.7 lO.5 0.2 0.3 18.3 (Iodin number 6.5) 74.6 I7.I 75.8 96. 9
* Communicated by the Chief of the Bureau. 1 Published in J. Agr. Research, 26 (Oct. 13, 1923) : 77. VOL. 197, No. 1188--39
559