para-hydroxybenzoic acid

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para-hydroxybenzoic acid

[¦par·ə hī¦dräk·sē·ben′zō·ik ′as·əd]
(organic chemistry)
C6H4(OH)COOH·2H2O Colorless crystals melting at 210°C; soluble in alcohol, water, and ether; used as a chemical intermediate and for synthetic drugs.
References in periodicals archive ?
guar gum powder (Ases Chemical Works, Jodhpur, India), epichlorohydrin (Aldrich, USA), 4-hydroxybenzoic acid (LOBA Chemic Pvt.
Improving laccase-facilitated grafting of 4-hydroxybenzoic acid to high-kappa kraft pulps.
Caffeic acid, syringic acid and 4-hydroxybenzoic acid (4-HBA) are phenolic acids which reported to have high antifungal activity against Ganoderma [3,5].
Summary: Fourteen compounds (1-14) namely 3-carbomethoxyindole (1), 6-hydroxy-7- methoxycoumarin (2), methyl-4-hydroxybenzoate (3), 4-hydroxybenzoic acid (4), p-coumaric acid (5), oleanolic acid (6), 4-ketopinoresinol (7), apigenin (8), apigenin-7-p-coumerate (9) apigenin-7-O- B-D-glucopyranoside (10), acacetin-7-O-[4-hydroxy-E-cinnamoyl-(6)-B-D-glucopyranoside (11), apigenin-7-O-[4-hydroxy-E-cinnamoyl-(6)-B-D-glucopyranoside (12), apigenin 7-O-B-D-[2,6- bis(4-hydroxy-E-cinnamoyl)]glucopyranoside (13) and apigenin 7-O-rutinoside (14) were isolated from the methanolic extract of the whole plant of Chrozophora plicata.
Parabens are esters of 4-hydroxybenzoic acid that are commonly used as antimicrobial preservatives in cosmetics, pharmaceuticals, and food or beverage processing (Andersen 2008).
Monomer Structure Chemical Name [] Hydroquinone (HQ) [] 4,4'-dihydroxybiphenyl (BP) [] Terephthalic acid (TA) [] 2,6-naphthalenedicarboxylic acid (NDA) [] 4-hydroxybenzoic acid (HBA) [[]REPRESENTS CHEMICAL STRUCTURES OF THE MONOMERS ] Table 2.
In this study, we report the findings on the effect of three phenolic acids; caffeic acids (CA), syringic acid (SA) and 4-hydroxybenzoic acid (4-HBA) in suppressing the Ganoderma invasion within the infected oil palm trees and their surrounding soil in estate.
Summary: Phytochemical investigations on the methanolic extract of Launaea intybacea yielded eleven compounds namely, octadecyl (E)-p-coumarate (1), 4-hydroxy-3- methoxybenzaldehyde (2), 4-hydroxybenzoic acid (3), 4-hydroxy-3-methoxybenzoic acid (4), coumaric acid (5), methyl gallate (6), 3,4-dihydroxybenzoic acid (7), 4',5,7- trihydroxyflavone (8), 3',4',5,7-tetrahydroxyflavone (9), 3,3',5,7-tetrahydroxy-4'- methoxyflavone (10) and apigenin 7-O-(4''-O-p-E-coumaroyl)-(Beta)-D-glucopyranoside (11).
Summary: Twelve compounds have been isolated for the first time from Oxalis corniculata namely, b-sitosterol (1), betulin (2), 4-hydroxybenzoic acid (3), ethyl gallate (4), 5-hydroxy-7,8- dimethoxyflavone (5), 5-hydroxy-3',4',6,7,8-pentamethoxyflavone (6), 7,5'-dimethoxy-3,5,2'- trihydroxyflavone (7), 5-hydroxy-3,6,7,4'-tetramethoxyflavone (8), 4',5-hydroxy-3,6,7- trimethoxyflavone (9), 5-hydroxy-3,6,7,4'-tetramethoxyflavone (10), apigenin 7-O-b-D-glucoside (11) and 3,3',5,7-trihydroxy-4'-methoxyflavone 7-O-b-D-glucopyranoside (12), respectively.
Vectra, a copolyester based on 4-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid, can under some circumstances crystallize/recrystallize both in the solid state and in the nematic melt, a behavior that profoundly affects the mobility of the chains and thereby the relaxation times (18-24).
An injection molding PE grade has been blended with a semirigid LCP (SBH), synthesized from sebacic acid (S), 4,4[prime]-dihydroxybiphenyl (B), and 4-hydroxybenzoic acid (H), as described before (21-25), and the effect of the addition of the PE-g-SBH copolymers, or that of a commercial MA-grafted PE sample, has been investigated by morphological, rheological and mechanical characterizations.