26 



P-AMINOBENZOIC ACID 



TABLE IV 

 Specificity of Microbiological Methods for the Determination of PABA 



" Eacli of the following compounds also has been found to be inactive as a source for Neurospora crassa: 

 p-aminobenzoyl-;8-alanine, p-aminobenzoyl-L-aspartic acid, p-aminobenzoyl-DL-aspartic acid, p-amino- 

 hippuric acid, p-aminobenzoylglutamic acid, p-aminobenzoyl-a-glutamyl-7-gIutumylglutamic acid 

 tctraethyl ester (also the corresponding 7, a and a,a componnd.s), p-nitrobenzoyl-a-glutamyi-7-glutamic 

 acid tetraethyl ester, p-nitrobenzoyl-i,-aminosebacic acid, p-nitr()bpnznyl-7-glutamyl-|3-al»nine, p-nitroben- 

 zoylethanolamino, p-nitrobenzoyldiothanolamine, p-nitrobenzoyl-DL-alaniiie, p-nitrobenzoylpiporidine, 

 p-nitrobpnzciyl-«-glutumyl-DL-loucinP, p-nitrobpnzoyl-7-glut:imylKlycine diethyl ester, p-nitrobonzoyl-DL- 

 «-amin()pimpIic acid, p-nitrohonzoyl-nL-a-amiiioadipic acid, p-nitrolienzoyl-ni.-tlireonine, p-nitrobenzoyl- 

 morpholine, /J-nitrobenzoyl-a-glutamylglutamic acid, .sodium pteniate, pteroyl-7-glutamyl-7-glutaniylghi- 

 tamic acid, pteroylmonoglutamic acid." 



Stated by Rubbo and Gillespie to be ten times as active as PABA. ■''' 



