Munier, R. 



1951. Partition microchromatography 

 on paper of alkaloids and various bio- 

 logical nitrogenous bases. V. Separa- 

 tion of the nitrogenous constituents of 



■^ the phosphoaminolipides; choline, eth- 



▲ anolamine and serine . Bulletin de la 

 Societe de chimie biologique , 33 : 862- 

 867. Chemical Abstracts, 46: 4172a 

 (1952). 



Good separation on paper was obtained 

 by using BuOH-ethylene chlorohydrin 

 coned. NH4OH-H2O (50:10:5:16), or BuOH 

 saturated with H2O and acidified with AcOH, 

 as the mobile phase. 



Nakamura, G. R. 



1952. Microdetermination of phosphorus. 



▲ Analytical Chemistry , 24: 1372. 



A micro modification of King's method 

 (Biochemical Journal, 26: 292, 1932) for 

 determination of l-lO/'g. of phosphorus. 



Narayan, K. A. andB. S. Kulkarni 



1954. Urea complexes of fatty acids. 

 II. Effect of solvent dilution on com- 

 plex formation. Journal of Scientific 

 # and Industrial Research (India) (B) 13^ 



9-15. Chemical Abstracts, 49: 5861h 

 (1955). 

 The effects of H2O dilution, urea concen- 

 tration, and other variables on the forma- 

 tion of urea complexes of fatty acids are 

 discussed. 



Nelson, G. J. andN. K. Freeman 



1959. Serum phosphoUpide analysis by 

 . chromatography and infrared spectro- 



v^ photometry. Journal of Biological 



Chemistry, 234: 1375-1380. 

 A semimicro method is described in 

 which the extracted lipids are separated 

 by elution from a silicic acid-Celite col- 

 umn with methylene chloride, acetone, 35% 

 methanol in methylene chloride, and meth- 

 anol . The amounts of cephaUn, lecithin, 

 and sphingomyelin are determined by infra- 

 red spectrophotometry. Error of the meth- 

 od is approximately 10%, depending on the 

 sample . 



Ng, H., A. D. Webb, and R. E. Kepner 



1956. Use of 2, 4-dinitrophenylhydra- 

 _. zones of p-phenylphenacyl esters as 



^ second derivatives of organic acids. 



• Analytical Chemistry , 28: 1975-1977. 

 A method is described for the separation 



and identification of the fatty acids from 

 acetic to octadecanoic by chromatography 

 as their p-phenylphenacyl -2, 4-dinitro- 

 phenylhydrazone derivatives on a silicic 

 acid-nitromethane column. Nitromethane - 

 saturated Skellysolve B is used as eluting 

 solvent. 



Nicolet, B . H . and L . A . Shinn 



1941. The determination of serine by 



the use of periodate. Journal of Biolog - 



^ ical Chemistry , 139 : 687-692. 



TTie formaldehyde formed from serine by 

 the action of periodate as determined as 

 the dimedon derivative. Accuracy of 2-3% 

 was achieved with amino acid samples con- 

 taining about 20 mg. of serine. The method 

 is not suitable for use in the presence of 

 carbohydrates or hydroxylysine, as they 

 react with periodic acid to yield formalde- 

 hyde. 



Niermierko, W. 



1947. Micromethods for the determina- 

 tion of iodine and thiocyanogen numbers 

 _ of fatty acids . Acta biologiae experi- 



• mentalis (Warsaw) 14: 199-205. Chem - 

 ical Abstracts, 42:92041 (1948). 



A modification of the method of Rosen - 

 mund and Kuhnhenn ( Zeitschrift fiir Unter- 

 suchung der Nsihrungs- und Genussmittel, 

 46: 154, 1923) was used for the microdeter- 

 mination of iodine number . 



Niermierko, W . 



1947. A micromethod for the determina- 

 tion of saturated acids . Acta biologiae 



• experimentalis (Warsaw) 14: 207-209. 

 Chemical Abstracts, 42:9205b (1948). 



A modification of Bertram's method ( Zeit- 

 schrift fiir Untersuchung der Lebensmittel , 

 55: 179, 1928) for use in microdetermina- 

 tion of saturated acids . 



51 



