49:27561 (1955). 

 Peroxides were determined by reduction 

 with FeClo in a benzene-methanol solution 

 and determination of the Fe"^"^ produced by 

 adding 2, 6-dichloroindophenol and H4P2O7. 



Hartman, L. 



1955. Analysis of glycerol . Chemistry 

 and Industry (London) pp. 1407-1408. 

 Chemical Abstracts, 50:2370a (1956). 



The glycerol sample is oxidized with 

 NalO^, the excess NaI04 is reduced with 

 propylene glycol, and the formic acid for- 

 med is measured by iodometric titration. 



Hartman, L. 



1956. Methanolysis of triglycerides. 

 Journal of the American Oil Chemists 



# Society, 33: 129, 1956. Chemical Ab- 

 stracts, 50:68131 (1956). 



Methyl esters were prepared by using 

 sodium methoxide with ignited potassium 

 carbonate as catalyst. This method was 

 found to set free 90-95% of the total glycer- 

 ol and cause the least degree of saponifica- 

 tion of the various catalysts tested. 



Hartmann, S. and J. Glavind 



1948. A new sensitive method for the 

 chemical determination of organic 

 9 peroxides. Acta physiologica Scan- 



dinavica, 16 (supplement 53): 32-33. 

 The leuco base of 2, 6-dichlorophenolindo- 

 phenol in acidified butanol is added to a 

 xylene solution of fatty acids and the mix- 

 ture is heated. The color developed by the 

 reaction is measured spectrophotometri - 

 cally and the peroxide value is calculated . 



Hartmann, S. and J. Glavind 



1948. A new sensitive method for the 

 determination of peroxides of fats and 



# fatty acids . Acta chemica Scandinavia , 

 3: 954-958. 



A method is described for the determina- 

 tion of peroxides in which dichlorodihydroxy- 

 phenylenediamine is oxidized by heating with 

 a xylene-acetic acid solution of the peroxid- 

 ized fat. The dichlorophenolindophenol which 

 is quantitatively formed is measured colori- 

 metrically. The reaction appears to be 

 quantitative and specific. 



Haven, F. L. and L. R. Levy 



1941. The occurrence and rate of turn- 

 over of tumor sphingomyelin. Journal 



^ of Biological Chemistry, 141 : 417-425. 



Sphingomyelin was determined as the 

 reineckate . 



Little difference in results was found 

 whether sphingomyelin was reextracted 

 from the residue of Bloor's extract with 

 petropeum ether or chloroform . More 

 sphingomyelin was extracted when an addi- 

 tional extraction with chloroform -methanol 

 was used than by a single alcohol -ether ex- 

 traction. Radioactive phosphorus was used 

 to track the sphingomyelin turnover . 



Hawthorne, J. N. and G. Hiibscher 



1959. Separation of glycerylphosphoryl 

 ■^ inositol and related compounds on 



# ion-exchange columns. Biochemical 

 A Journal, 7L 195-200. 



The phospholipid is hydrolyzed with NaOH 

 and the hydrolysis products are separated 

 by ion exchange chromatography . 



Helrich, K. and W. Rieman, III 



1947. Determination of acetyl number of 

 _ fats and oils. Analytical Chemistry, 19 : 



• 691. 



A simplification of the method of Roberts 

 and Schuette ( Industrial and Engineering 

 Chemistry, Analytical Edition , 4: 257, 1932). 



Henley, A. A. 



1957. The determination of serum cho- 



■ lesterol. Analyst , 82: 286-287. 



A modification of the method of Zlatkis, 

 Zak, and Boyle which avoids protein inter- 

 ference is described. Proteins are precip- 

 itated by adding the serum to a stable ferric 

 chloride-acetic acid reagent, and removed 

 by centrifuging. The color is developed on 

 a portion of the protein-free extract by add- 

 ing H2SO4. 



Hepburn, J . S . and R . Kotlikoff 



1943. Comparative study of certain meth- 

 ods for the determination of serum cho- 

 lesterol. Review of Gastroenterology, 

 J^: 170-171. Chemical Abstracts. 38: 

 58646(1944). 

 The methods of Bloor (Journal of Biological 



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