University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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4-hydroxybenzaldehyde

  • IUPAC Name: 4-hydroxybenzaldehyde
  • Molecular Formula: C7H6O2
  • CAS Registry Number: 123-08-0
  • InChI: InChI=1S/C7H6O2/c8-5-6-1-3-7(9)4-2-6/h1-5,9H
  • InChI Key: RGHHSNMVTDWUBI-UHFFFAOYSA-N

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Citations 3

"Spectrophotometric Determination Of Mixtures Of 2-, 3- And 4-hydroxybenzaldehydes By Flow Injection Analysis And UV/VIS Photodiode-array Detection"
Talanta 1994 Volume 41, Issue 1 Pages 59-66
Lars Nørgaard and Carsten Ridder*

Abstract: Samples (77 µL) containing 2-hydroxybenzaldehyde (I), 3-hydroxybenzaldehyde (II), 4-hydroxybenzaldehyde (III) or mixtures thereof in aqueous 10% ethanol and a modified Britton-Robinson buffer (pH 11.4) as the reagent solution were injected simultaneously into the flow injection apparatus (described) with a modified Britton-Robinson buffer (pH 4.5) as the carrier (0.375 ml/min) and a 8 µL flow cell. Spectrometric scanning (250-450 nm, every 2 nm) commenced 20 s after the injection and continued with a 1 s interval in 88 s. Each sample injection provided a data matrix consisting of 89 x 101 absorbances, containing both the acidic and basic characteristics of the sample injected. A least-squares algorithm was used to predict concentration in unknown samples. No assumptions about the qualitative mixture composition were necessary. Four data types were used in the least-squares modeling: unfolded raw data; acidic spectra; basic spectra; and first spectral derivative of the raw data. The prediction errors obtained for I-III were comparable to literature values. A graphic method was developed.
Spectroscopy Spectrophotometry Buffer Signal processing Calibration

"Evaluation Of Partition Measurements In Liquid-liquid Segmented Flow"
Talanta 1994 Volume 41, Issue 8 Pages 1377-1382
Lars-Göran Danielsson and Zhang Yu-Hui,

Abstract: Equations are presented for the calculation of partition coefficients determined by two-phase FIA. The equations were demonstrated with the injection of 20 µL metoprolol, p-hydroxybenzaldehyde, p-nitrophenol, phenol, propranolol and p-toluidine in CHCl3 or 0.15 M phosphate buffer of pH 5-6 into a carrier stream of CHCl3 or buffer and subsequently mixed in a PTFE reaction coil (2 m x 0.5 mm i.d.). The two phases were pumped at a total flow rate of 0.21-3.7 ml/min and the organic and aqueous phases separated under N2 using 0.2 and 0.22 µm PTFE and poly(vinylidene fluoride) membranes. The absorbance of the separated phases was determined by spectrophotometry. The product of carrier flow rate and peak area RSD was 0.87% (n = 11). Separation efficiencies of 80-90% and 40-50% were obtained for the hydrophobic and hydrophilic membranes, respectively.
Spectrophotometry Sample preparation Organic phase detection Hydrophilic membrane Hydrophobic membrane Solvent extraction Partition coefficients

"Rank Annihilation Factor Analysis Applied To Flow Injection Analysis With Photodiode-array Detection"
Chemom. Intell. Lab. Syst. 1994 Volume 23, Issue 1 Pages 107-114
Lars Nørgaard and Carsten Ridder*

Abstract: The species analyzed were 2-, 3- and 4-hydroxybenzaldehydes. Tubes were of polypropylene and the carrier stream was a Britton-Robinson buffer with a pH of 4.5. A Hewlett-Packard 8452A PDA spectrophotometer was used with an 8 µL flow cell. Due to the nature of the FIA data, the rank of the involved sample data matrices does not correspond to the number of chemical components in the samples. The prediction errors for one- and two-component samples are satisfactory, whereas the errors with 3-component samples are unacceptable, probably because of a lack of standardization of the injection procedure.
Spectrophotometry Buffer