para-hydroxybenzoic acid

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par·a-hy·drox·y·ben·zo·ic acid

 (păr′ə-hī-drŏk′sē-bĕn-zō′ĭk)
n.
An organic acid, C7H6O3, widely used in the preparation of preservatives.
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References in periodicals archive ?
Exogenous 4-hydroxybenzoic acid and salicylic acid modulate the effect of short-term drought and freezing stress on wheat plants.
4'4'-Dichlorodiphenyl sulfone (DCDPS) and 4-hydroxybenzoic acid phenyl ester were purchased from ABCR and vacuum dried at 50[degrees]C for 24 h before use.
For example, 4-hydroxybenzoic acid and 4-hydroxyhippuric acid are metabolites of parabens, toxic compounds found in lotions, cosmetics, other toiletries, and even food.
It was found that the bacteria Ralstonia eutropha H16 (Cupriavidus necator), known to be a producing strain for PHA, biosynthesized PHA from the lignin component 4-Hydroxybenzoic acid (4-HBA) and numerous other aromatic compounds.
The carboxylic acids used in this study were oxalic acid (OX), malic acid (MAL), citric acid (CIT), 4-hydroxybenzoic acid (HB), protocatechuic acid (PCH), 4-hydroxycinnamic acid (HC; also known as p-coumaric acid), and caffeic acid (CAF).
Due to rising prices of petroleum products the guar gum powder has been selected for development of guar gum 4-hydroxybenzoic acid (GHBA) resin, whose cost is very low, because it is locally available in large quantities from agriculture resources and these biopolymers are eco-friendly.
Two different mediators were tested, vanillic acid (VAN) and 4-hydroxybenzoic acid (HBA), of which HBA performed best.
sacra were also examined, and hydroquinone (1), caffeic acid (3), protocatechuic acid (6), gallic acid (7), (-)-epigallocatechin 3-O-gallate (8), 3-O-galloylepigallocatechin-(4beta--Greater than 8)-epigallocatechin+ ++ 3-O-gallate (10), heterodendrin (17) and gallic acid 4-O-beta-D-glucopyranoside (19) were found to show mild or strong inhibitory activity against superoxide anion radical (*O2-), while 4-hydroxybenzoic acid (2), 3, 4-hydroxycinnamic acid (4), 6-8 and 19 inhibited hydroxyl radical (OH*).
7mM, 4-hydroxybenzoic acid 24mM, 4-amino anti pyrine 0.
Paraben preservatives have been effectively used to protect both food and cosmetics from spoilage for many years (but) the parabens, 4-hydroxybenzoic acid esters, have come under suspicion recently," observed Rich Otterson, technical director, McIntyre Group.
2000b); methyl gallate, gallic acid, 3,4-dihydroxyben-zoic acid, 4-hydroxybenzoic acid, kaempferol, kaempferol-3-O-[beta]-D-galactoside, kaempferol 3-O-[beta]-D-glucoside, quercetin and quercetin 3-O-[beta]-D-glucoside from Orostachys japonicus (Park et al.