phosphorus. Journal of Biological 

 Chemistry, 66: 375-400. 



Aminonaphtholsulfonic acid is used for 

 reduction of phosphomolybdic acid in the 

 presence of bisulfite in place of the hydro- 

 quinone used in earlier methods. Effects 

 of interfering substances and variations in 

 reagent concentrations on the development 

 of color are discussed. 



The method is suitable for colorimetric 

 determination of inorganic and total phos- 

 phate in a variety of biological materials . 



Fitelson, J. 



1950. A new oxidation method for the 

 determination of saturated fatty acids . 

 _ Journal of the American Oil Chemists 



Society, 27: 1-8. Chemical Abstracts, 

 44:2259f (7950) . 

 Saturated fatty acids are purified by 

 chromatography on alumina after oxidation 

 of the unsaturated acids with performic 

 acid and extraction of the oxidation products 

 with petroleum ether. 



Fleckenstein, A., E. Gerlach, and J. Janke 

 1953. Rapid test for identification of 

 easy and difficultly hydrolyzable phos- 

 phoric esters in paper chromatogram , 

 Naturwissenschaften, 40: 462. Chem- 



Fleury, P. andH. Guitard 



1948. Determination of choline in leci- 

 thin. Annales pharmaceutiques fran- 



A caises, 6: 252-254. Chemical Ab- 



stracts , 43:5344h (1949). 

 Choline is determined colorimetrically 

 as the reineckate. 



Fleury, P., J. Courtois, and M. Grandchamp 



1949. Estimation of mixtures of cola- 

 mine and serine. Biochimica et bio- 



ical Abstracts, 48:8124g (1954). 

 The chromatogram is sprayed with molyb- 

 date reagent and exposed to H2S, which turns 

 spots containing P to a blue color . Exposing 

 the paper to NH3 vapor causes the color to 

 disappear from the spots caused by phos- 

 phoric esters which are difficult to hydro - 

 lyze, while the spots from inorganic P or 

 readily hydrolyzed esters remain blue . 



Fleury, P. andR. Paris 



1933. , A comparison of the action of 

 periodic acid on the CC and /3 glycero- 

 phosphoric acids. Compte rendu, 196 : 

 1416-1418. Chemical Abstracts, 2^ 

 3915 (1933). 

 A confirmation of earlier findings that 

 oxidation by HIO4 of a compound having 

 several alcoholic groups does not take place 

 unless these groups are adjacent. 



physica Acta , 3: 336-340. (In French). 

 Ethanolamine and serine are estimated 

 by determination of the NH3 liberated and 

 the amount of periodic acid reduced during 

 48 hours of standing at room temperature. 



Folch, J. and D. D. van Slyke. 



1939. Nitrogenous contaminants in pe- 

 troleum extracts of plasma lipids. 

 Journal of Biological Chemistry , 129: 

 539-546. 

 Urea is the primary N-containing con- 

 taminant of petroleum extracts of plasma 

 lipids. Although urea is- insoluble in pe- 

 troleum ether, it is dissolved in a lipid ex- 

 tract of petroleum ether, presumably due 

 to the solvent effect of the lipids . 



Folch, J. and D. D. van Slyke 



1939. Preparation of blood lipid extracts 

 free from non-lipid extractives. Pro- 

 ■Ar ceedings of the Society for Experiment - 



al Biology and Medicine , 41: 514-515. 

 Proteins and lipids are precipitated to- 

 gether with colloidal iron and washed with 

 HjO, and the lipids are extracted with alco- 

 hol-ether. Brante ( Acta physiologlca Scan- 

 dinavica , 18 (supplement 63): 1, 1949), and 

 Sperry ( Journal of Biological Chemistry , 170: 

 675, 1947) found that a considerable amount 

 of lipid material is lost by this method of 

 purification . 



Folch, J. 



1941. Isolation of phosphatidyl serine 

 from brain cephalin and identification 

 ▲ of the serine component. Journal of 



Biological Chemistry, 139 : 973-974. 

 Phosphatidj^l serine is separated from 

 brain cephalin by precipitation of the ce- 

 phalin in alcohol -chloroform, and the 



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