Results 161 to 170 of about 18,309 (199)
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Journal of Liquid Chromatography & Related Technologies, 2006
Abstract A high performance liquid chromatography (HPLC) method for the assay of phenylformic acid, 2,4‐hexadienoic acid, methyl 4‐hydroxybenzoate, and propyl 4‐hydroxybenzoate preservatives was developed and validated. The use of a reversed‐phase C8 column using an isocratic elution system enabled four compounds to be separated simultaneously in one ...
Ghulam A. Shabir +3 more
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Abstract A high performance liquid chromatography (HPLC) method for the assay of phenylformic acid, 2,4‐hexadienoic acid, methyl 4‐hydroxybenzoate, and propyl 4‐hydroxybenzoate preservatives was developed and validated. The use of a reversed‐phase C8 column using an isocratic elution system enabled four compounds to be separated simultaneously in one ...
Ghulam A. Shabir +3 more
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Microbial production of specifically ring-13C-labelled 4-hydroxybenzoic acid
Applied Microbiology and Biotechnology, 1995When transformed with a recombinant vector carrying the ubiC gene (encoding chorismate pyruvate-lyase, EC 4.1.3.27) the triple mutant (Phe-, Trp-, Tyr-) Klebsiella pneumoniae 62-1 excretes 4-hydroxybenzoic acid instead of chorismic acid. The recombinant strain can be used to produce in high yield specifically ring-labelled 4-hydroxybenzoic acid from ...
R, Müller +3 more
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Copolyesters of 4-hydroxy-3-phenylbenzoic acid and 4-hydroxybenzoic acid
Polymer, 1992Abstract Crystalline poly(3-phenyl-4-hydroxybenzoic acid) was prepared by polycondensation of 4-acetoxy-3-phenylbenzoic acid in solution at 320°C. Differential scanning calorimetry (d.s.c.) and wide angle X-ray scattering (WAXS) measurements indicate that this homopolyester forms a nematic melt between 345°C and 465°C.
Hans R. Kricheldorf, Frank Ruhser
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3-[(2-Aminoethyl)iminomethyl]-4-hydroxybenzoic Acid 0.28-Hydrate
Acta Crystallographica Section C Crystal Structure Communications, 1998The title compound crystallizes as a hydrated zwitterion with the site for the water molecule only partially occupied [site-occupancy factor 0.28 (1)] and a formula of C10H12N2O3.0.28H2O. The hydroxyl H atom forms an intramolecular hydrogen bond to the imine N atom. The NH3+ and COO− groups of the zwitterion form a two-dimensional hydrogen-bond network
M. A. Whitener +2 more
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4-Hydroxybenzoic acid—a versatile platform intermediate for value-added compounds
Applied Microbiology and Biotechnology, 20184-Hydroxybenzoic acid (4-HBA) has recently emerged as a promising intermediate for several value-added bioproducts with potential biotechnological applications in food, cosmetics, pharmacy, fungicides, etc. Over the past years, a variety of biosynthetic techniques have been developed for producing the 4-HBA and 4-HBA-based products.
Songwei, Wang +4 more
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Synthesis of thermotropic polybenzoxazole using 3-amino-4-hydroxybenzoic acid
Journal of Polymer Research, 2017Bio-based polybenzoxazoles (PBOs) are prepared by polycondensation of diacid monomer derived from 3-amino-4-hydroxybenzoic acid with a series of aliphatic diamines. Resulting bio-based PBOs have high weight average molecular weight ranging 5.70–7.20 × 104 g/mol and show ultrahigh thermal resistance with T 10
Mohammad Asif Ali +4 more
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Journal of the Society of Chemical Industry, 1950
AbstractDetailed growth curves based on progressive turbidity readings have been used to study the inhibition of Aerobacter aerogenes Type I, by a series of alkyl 4‐hydroxybentoates. Results in the lag phase are irregular, but it is apparent that the elongation of this phase becomes very marked at the higher concentrations of the inhibitor and that ...
W. G. Murrell, J. M. Vincent
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AbstractDetailed growth curves based on progressive turbidity readings have been used to study the inhibition of Aerobacter aerogenes Type I, by a series of alkyl 4‐hydroxybentoates. Results in the lag phase are irregular, but it is apparent that the elongation of this phase becomes very marked at the higher concentrations of the inhibitor and that ...
W. G. Murrell, J. M. Vincent
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Journal of Pharmaceutical Sciences, 1984
An isothermal chromatographic (GC) method employing an SE-30 column and flame-ionization detection has been developed for the simultaneous assay of methyl, ethyl, propyl, and butyl 4-hydroxybenzoates and 4-hydroxybenzoic acid in liquid antacid formulations. The method, which uses a silica column chromatographic cleanup step prior to GC, is specific for
G W, Schieffer +2 more
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An isothermal chromatographic (GC) method employing an SE-30 column and flame-ionization detection has been developed for the simultaneous assay of methyl, ethyl, propyl, and butyl 4-hydroxybenzoates and 4-hydroxybenzoic acid in liquid antacid formulations. The method, which uses a silica column chromatographic cleanup step prior to GC, is specific for
G W, Schieffer +2 more
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Journal of the Society of Chemical Industry, 1947
AbstractThe preparation is described of the methyl 4‐n‐amoxy‐, methyl 4‐n‐butoxy‐, ethyl 4‐n‐propoxy‐, n‐propyl 4‐cthoxy‐ and n‐butyl 4‐methoxy‐benzoates, and their hydrolysis products‐the 4‐n‐alkoxybenzoic acids.
G. W. K. Cavill, N. A. Gibson
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AbstractThe preparation is described of the methyl 4‐n‐amoxy‐, methyl 4‐n‐butoxy‐, ethyl 4‐n‐propoxy‐, n‐propyl 4‐cthoxy‐ and n‐butyl 4‐methoxy‐benzoates, and their hydrolysis products‐the 4‐n‐alkoxybenzoic acids.
G. W. K. Cavill, N. A. Gibson
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