para-hydroxybenzoic acid

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par·a-hy·drox·y·ben·zo·ic acid

An organic acid, C7H6O3, widely used in the preparation of preservatives.
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For example, 4-hydroxybenzoic acid and 4-hydroxyhippuric acid are metabolites of parabens, toxic compounds found in lotions, cosmetics, other toiletries, and even food.
Caffeic acid, syringic acid and 4-hydroxybenzoic acid (4-HBA) are phenolic acids which reported to have high antifungal activity against Ganoderma [3,5].
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*).
Parabens are esters of 4-hydroxybenzoic acid that are commonly used as antimicrobial preservatives in cosmetics, pharmaceuticals, and food or beverage processing (Andersen 2008).
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.