Results 151 to 160 of about 18,309 (199)
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Antimicrobial effect of 4-hydroxybenzoic acid ester with glycerol
Journal of Clinical Pharmacy and Therapeutics, 2015Parabens have been commonly used as preservatives in pharmaceutical and cosmetics industries for almost 50 years. These compounds are thermostable, pH-stable and inexpensive and have a wide antimicrobial effect. The antimicrobial activity of parabens in emulsion system is limited by their poor solubility in water phase, which is increasing with the ...
M, Kosová +5 more
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Selective Synthesis of 4-Hydroxybenzoic Acid using Immobilized Cyclodextrin
Journal of Inclusion Phenomena, 1984β-cyclodextrin immobilized with epichlorohydrin was used for the selective syntheses of 4-hydroxybenzoic acids from phenols and carbon tetrachloride in aqueous sodium hydroxide solutions. The selectivities were 100%, and the yields were larger than 80 mole%.
M. Komiyama, I. Sugiura, H. Hirai
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Synthesis of 4-Hydroxybenzoic Acid Derivatives in Escherichia coli
Journal of Agricultural and Food Chemistry, 2020Hydroxybenzoic acids (HBAs) such as 4-hydroxybenzoic acid (4-HBA) and 3,4-dihydroxybenzoic acid (DHB; protocatechuic acid) and its ester with methanol (methylparaben [MP]) are known to have various functional biological properties, including antibacterial, anticancer, antidiabetic, antiaging, antiviral, and anti-inflammatory activities.
Han Kim +3 more
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Biodegradation of 4-hydroxybenzoic acid by Phomopsis liquidambari
Applied Soil Ecology, 2011Abstract Phenolic acid allelochemicals released by decomposing foliage can have negative impacts on growth of plants and microbes in soil. However, these chemicals can potentially be degraded by broad-spectrum endophytic fungi such as, Phomopsis liquidambari (strain B3), which is capable of growing on phenolic 4-hydroxybenzoic acid (4-HBA) as the ...
Yan Chen +3 more
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Macromolecules, 1991
The PHBA homopolymer displays a shallow relaxation at low temperature and a stepwise increase in dielectric constant for all frequencies at the high-temperature crystal-to-smectic E transition, while the copolyesters display two solid-phase relaxations with increasing temperature that appear to correlate with localized rotations of the HBA units and ...
Douglass S. Kalika, Do Y. Yoon
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The PHBA homopolymer displays a shallow relaxation at low temperature and a stepwise increase in dielectric constant for all frequencies at the high-temperature crystal-to-smectic E transition, while the copolyesters display two solid-phase relaxations with increasing temperature that appear to correlate with localized rotations of the HBA units and ...
Douglass S. Kalika, Do Y. Yoon
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Excited-state proton transfer of 3-hydroxybenzoic acid and 4-hydroxybenzoic acid
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2010The excited-state proton transfer of 3-hydroxybenzoic acid and 4-hydroxybenzoic acid was studied by time-resolved laser-induced fluorescence spectroscopy with ultra-short laser pulses. The excited-state reactions were identified in aqueous media as a function of the pH value.
Vulpius, D., Geipel, G., Bernhard, G.
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Macromolecular Chemistry and Physics, 2000
A series of liquid crystalline oligomers of 4-hydroxybenzoic acid (HBA) and 2-alkoxyHBAs were synthesized. The structural and conformational changes the oligomers were studied by FTIR spectroscopy. The strengthening abilities of the synthesized co-oligomers were investigated by blending the oligomers with polyamide 11 (PA 11).
Anu M. Moilanen, Osmo E. O. Hormi
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A series of liquid crystalline oligomers of 4-hydroxybenzoic acid (HBA) and 2-alkoxyHBAs were synthesized. The structural and conformational changes the oligomers were studied by FTIR spectroscopy. The strengthening abilities of the synthesized co-oligomers were investigated by blending the oligomers with polyamide 11 (PA 11).
Anu M. Moilanen, Osmo E. O. Hormi
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Whiskers of poly(4‐hydroxybenzoic acid) — preparative aspects
Die Makromolekulare Chemie, 1991AbstractPolycondensation of 4‐acetoxybenzoic acid (4‐ABA) at 300–400°C involves side reactions yielding a difficult to be hydrolyzed fraction of modified poly(4‐hydroxybenzoic acid) (poly‐HBA). Such side reactions are the formation of diphenyl ether groups, Fries‐rearrangement, formation of ketene or acetic anhydride and, possibly, isomerization to 3 ...
Hans R. Kricheldorf +3 more
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4-Hydroxybenzoic acid for multiple system atrophy?
Parkinsonism & Related Disorders, 2018Increasing evidence supports a link between multiple system atrophy and coenzyme Q10 (CoQ10) biosynthesis. However, so far this knowledge was not translated into tangible benefits for affected patients. Poor bioavailability of oral CoQ10 might constitute a major problem.
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ChemInform, 2009
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Sankar P. Dey, Dilip K. Dey
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Sankar P. Dey, Dilip K. Dey
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