p-aminobenzoic acid

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p-aminobenzoic acid

 (PAB) (PABA) [ah-me″no-ben-zo´ik]
a substance required for the synthesis of folic acid by many organisms; it is included in the B vitamin complex, although it is not an essential nutrient for humans. It is synthesized by many bacteria; sulfonamides act by blocking its synthesis; it also absorbs ultraviolet light, specifically UVB rays, and is used as aminobenzoic acid as a topical sunscreen.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

p-a·mi·no·ben·zo·ic ac·id (PABA),

(ă-mē'nō-ben-zō'ik as'id),
4-aminobenzoic acid, a factor in the vitamin B complex, required for biosynthesis of folate; neutralizes the bacteriostatic effects of the sulfonamides because it furnishes an essential growth factor for bacteria; elevated concentrations of the sulfonamides interfere with use of this agent and of folates; used as an ultraviolet screen in lotions and creams. It is produced in a test of pancreatic function.
Farlex Partner Medical Dictionary © Farlex 2012

p-ami·no·ben·zo·ic acid

(PABA) (ă-mē'nō-ben-zō'ik as'id)
A factor in the vitamin B complex, a part of all folic acids and required for its formation; neutralizes the bacteriostatic effects of the sulfonamides because it furnishes an essential growth factor for bacteria, with the use of which sulfonamides interfere; used as an ultraviolet screen in lotions and creams.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
G, isopropanol; H, glycerol; I, lactic acid; J, 4-aminobenzoic acid.
1: List of all proficiency chemicals used in this study to evaluate the performance of the h-CLAT adapted to animal-product-free conditions Proficiency substance CAS number 2,4-Dinitrochlorobenzene 97-00-7 4-Phenylenediamine 106-50-3 Nickel sulphate 10101-97-0 2-Mercaptobenzothiazole 149-30-4 R(+)-Limonene 5989-27-5 Imidazolidinyl urea 39236-46-9 Isopropanol 67-63-0 Glycerol 56-81-5 Lactic acid 50-21-5 4-Aminobenzoic acid 150-13-0 Tab.
This was actualised by mixing 4 g of the cross-linked beads in 0.1 g/l of 4-aminobenzoic acid in an open neck flask.
The grafting of 4-aminobenzoic acid onto the backbone of cross-linked beads lead to the evenness of the surface.
Pristine graphenes were prepared from graphite powder by chemical method and the amine-functionalized graphenes were prepared successfully via treating them with 4-aminobenzoic acid in polyphosphoric acid.
Triethanolamine 102-71-6 NS 5 -- 4-aminobenzoic acid 150-13-0 NS 5 no cat.
4-nitrophenol, 2-aminobenzoic acid, benzamide, 4-aminobenzoic acid, resorcinol, obromonitrobenzene and 2-nitroaniline were used as active aromatic coupling compounds for the second step.
Summary: A series of Schiff bases of pyridine-4-carbaldehyde with 3-aminobenzoic acid, 2- aminobenzoic acid, 4-aminobenzoic acid, 1,3-phenylenediamine, 1,2-phenylenediamine, 2- aminothiophenol, 4-aminoantipyrene, 2-aminophenol and naphthalene-1-amine was synthesized and compounds were characterized by FTIR, NMR and mass spectrometry.
All the chemicals, including 4-aminobenzoic acid, ferrocene, hexadecyltrimethyl ammonium bromide and sodium nitrite were purchased form Sigma Aldrich and were used without purification while tribenzyltin chloride and dibenzyltin chloride was prepared by the literature method [29].
Lewandowski, "Experimental and theoretical IR, Raman, NMR spectra of 2-, 3- and 4-aminobenzoic acids, " Journal of Molecular Structure, vol.