y bioqulmica (Buenos Aires) 13: 1-8. 



Chemical Abstracts, 36:6442^(1942). 

 A method for use with Reinecke precip- 

 itates. NaOH and H2O2 are added direct- 

 ly to a solution of the salt, the solution is 

 acidified with H2SO4, diphenylcarbazide 

 is added, and the solution is compared with 

 a standard in a colorimeter. 



Rouser, G., G. V. Marinetti, R. F. Witter, 

 J . F . Berry, and E . Stotz 



1956. Paper chromatography of phospho- 

 -^ lipides. Journal of Biological Chemis- 



A try, 223: 485-497. 



Individual phospholipids were separated 

 from each other and other lipids by paper 

 chromatography using mixtures of lutidine 

 and acetic acid with alcohols or chloroform 

 as solvents. Factors influencing the mobil- 

 ity of phospholipids on paper were studied 

 and are discussed. An explanation of the 

 chromatographic behavior of phospholipids 

 is presented. 



Rudloff, E. von 



1956. Periodate -permanganate oxidations, 

 rv . Determination of the position of 

 double bonds in unsaturated fatty acids 



# and esters . Journal of the American 

 Oil Chemists Society, 33: 126-128. 

 Chemical Abstracts, 50:6815b (1956). 



Unsaturated fatty acids were quantitative- 

 ly oxidized with periodate -permanganate re- 

 agent. The oxidation products were sepa- 

 rated by chromatography on silicic acid and 

 identified. 



Rusoff, I. I., R. T. Holman, andG. O. Burr 



1945. Table of spectroscopic data on fats, 

 fatty acids, and their esters . Oil and 



• Soap, 22: 290-294. Chemical Abstracts , 

 40:224'^ (1946). 



A table of spectroscopic data with 81 ref- 

 erences. 



Saifer, A. andO. F. Kammerer 



1946. Photometric determination of total 

 cholesterol in plasma or serum by a 

 modified Liebermami-Burchard reaction. 

 Journal of Biological Chemistry, 164 : 

 657-677. 



Acetic anhydride -dioxane (3:2) is used 



for simultaneous extraction of cholesterol 

 and precipitation of protein in serum or 

 plasma. Color is developed by addition of 

 H2 SO4 to the extract. Accuracy is j- 5%. 

 The effects of the variables are given. 



Saifer, A. 



1951 . Photometric determination of total 

 and free cholesterol and the cholesterol 

 ester ratio of serum by a modified Lieb- 

 ermann-Burchard reaction. American 

 Journal of Clinical Pathology, 21^: 24-32. 

 A modification of the total cholesterol 

 method of Saifer and Kammerer (Journal of 

 Biological Chemistry, 164: 657, 1946) for 

 use in the determination of free cholesterol 

 in serum . 



Sakagami, T. 



1958. A new colorimetric method for de- 

 termination of sphingosine base in lipids. 

 Journal of Biochemistry , (Tokyo) 45: 

 313-317. Chemical Abstracts, 52: 

 18598g(1958). 

 Sphingosine base is oxidized with lead 

 acetate and the fatty aldehyde formed is de- 

 termined by measurement of the color pro- 

 duced by the plasmal reaction. 



Sakuri, H. 



1954. Complexes of urea with fatty acids 

 and their derivatives. I. Separation of 

 fatty acids and their methyl esters by 

 _, urea complexes, and consideration of 



^ the reaction mechanism. Journal of the 



Chemical Society of Japan, Industrial 

 Chemistry Section, 57: 50-51. Chemical 

 Abstracts, 49:2098b (1955). 

 Stearic and oleic acid are more readily 

 separated if urea complex methods are used 

 on their methyl esters rather than the free 

 acids . 



Samuelson, G. 



1953 . The photometric determination of 

 choline and choline derivatives. Jour- 

 nal of Pharmacy and Pharmacology , 5: 

 239-244. 

 Choline is determined by spectrophoto- 

 metric measurement at 415 m . of an ace- 

 tone solution of its 2,4,6-hexanitrodiphenyl- 

 amine derivative. The color is stable and 

 the method is accurate to within 2%. 



60 



