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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Gallic acid, 3,4-hydroxybenzoic acid, 4-hydroxybenzoic acid, chlorogenic acid, vanillic acid, caffeic acid, p-coumaric acid, ferulic acid, cinnamic acid (Sigma-Aldrich Co., USA) were used as standards.
The results showed that purple nutsedge interference and drought interact in determining the increase of ROS accumulation, PAL activity and accumulation of phenolic compounds in the leaves of soybean, but the composition of phenolic compounds showed increased accumulation occurs in vanillic acid, 2,5-dihydroxybenzoic acid, caffeic acid, syringic acid, trans-cinnamic acid and salicylic acid, while the composition of 4-hydroxybenzoic acid, trans-ferulic acid and coumaric acid show variation in different treatments.
Compound rt (min) PDA rt (min) QqQ Hydroxybenzoic acids (1) Shikimic acid 1.50 2.35 (2) Protocatechuic acid 5.99 6.80 (3) 4-Hydroxybenzoic acid 8.05 8.82 (4) Vanillic acid 9.04 9.82 (5) Syringic acid 9.31 10.06 Hydroxycinnamic acids (6) Quinic acid 1.51 2.28 (7) Chlorogenic acid 7.51 8.30 (8) Caffeic acid 9.09 9.85 (9) Coumaric acid 11.07 11.79 (10) Sinapic acid 11.65 12.36 (11) Ferulic acid 11.73 12.43 (12) 4,5-Dicaffeoylquinic 11.75 12.45 acid Xanthones (13) Mangiferin 8.83 9.62 Flavonols (14) Rutin 10.86 11.62 (15) Isoquercitrin 11.34 12.10 (16) Quercetin 15.25 16.01 (17) Kaempferol 17.16 17.89 Flavanones (18) Naringin 12.07 12.82 (19) Naringenin 16.86 17.53 Flavones (20) Linarin 12.43 13.22 (21) Luteolin 15.08 15.85 (22) Acacetin 16.08 17.03 (23) Apigenin 16.68 17.38 [[lambda].sub No.
Stock standard solutions were prepared by accurately weighing 10 mg of caffeic acid, chlorogenic acid, p-coumaric acid, trans-ferulic acid, cinnamic acid, quercetin, luteolin, apigenin, rutin, vanillic acid, syringic acid, o-coumaric acid, catechin, vanillin, trans-chalcone, 4-hydroxybenzoic acid, 2-(4-hydroxyphenyl)ethanol, and 3,4-dihydropyran reference standards into separate 2 ml volumetric flasks and dissolving in methanol.
Utilization patterns of the 31 carbon sources in the sediments from the river sites (SC1, SC2, and SC3) were similar to each other except for 11 carbon substrates: phenylalanine (ANOVA, F = 9.6, P = 0.001), L-arginine (ANOVA, F = 4.2, P = 0.23), L-threonine (ANOVA, F = 3.7, P = 0.037), D-galacturonic acid [gamma]-lactone (ANOVA, F = 5.7, P = 0.007), D-xylose (ANOVA, F= 6.2, P = 0.005), [alpha]-ketobutyric acid (ANOVA, F= 6.1, P = 0.006), D-malic acid (ANOVA, F= 6.7, P = 0.004), itaconic acid (ANOVA, F = 3.5, P = 0.040), [alpha]-cyclodextrin (ANOVA, F= 5.6, P = 0.008), 2-hydroxybenzoic acid (ANOVA, F= 7.4, P = 0.002), and 4-hydroxybenzoic acid (ANOVA, F = 10.8, P = 0 < 0.0001).
We also analyzed the following 11 oxygenated aromatic compounds of polar substances: 4-nitrophenol (4-N[O.sub.2]-Phen), 2-hydroxybenzoic acid (2-OH-BA), 3-hydroxybenzoic acid (3-OH-BA), 4-hydroxybenzoic acid (4-OH-BA), ortho-phthalic acid (o-PhA), meta-phthalic acid (m-PhA), para-phthalic acid (p-PhA), 4-methylphthalic acid (4-Me-PhA), 1,2,3-benzenetricarboxylic acid (1,2,3-BA), 1,2,4-benzenetricarboxylic acid (1,2,4-BA), and 1,2,4,5-benzenetetra-carboxylic acid (1,2,4,5-BA) (Sigma-Aldrich Canada).
Phenolic content of green tea extracts (mg phenolic/kg plant) Phenols CH[Cl.sub.3] EtOAc n-BuOH extract extract extract Gallic acid 0.25 777.93 1344.96 Gentisic acid 0.15 ND 102.14 Catechins 0.04 174.95 ND Chlorogenic acid ND 2.37 21.18 4-Hydroxybenzoic acid 0.31 ND 1.8 Protocatechuic acid 0.03 2.49 3.51 Caffeic acid 0.04 7.43 5.66 Vanillic acid 5.00 46.31 20.04 4-Hydroxybenzaldehyde 0.3 0 ND Rutin 0.11 22.2 646.29 p-Coumaric acid 0.70 15.00 4.18 Ellagic acid 0.51 0.85 1.35 Chicoric acid ND 0.2 0.67 Ferulic acid ND ND 1.92 Hesperidin ND 0.65 2.5 Apigenin 7-glucoside ND 0 1.96 Rosmarinic acid 0.03 0.237 ND Protocatechuic acid ND 0.05 0 ethyl ester Salicylic acid 6.5 34.69 21.23 Resveratrol ND ND 0.08 Quercetin 0.71 ND ND Naringenin 0.08 0.35 ND Kaempferol ND ND 0.43 ND: not detected.
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.