Improved quantitation of 2,4-dichlorophenol in plant tissues by high-performance liquid chromatography with amperometric detection

Chesney, David; Tallman, Dennis E.; Peckrul, Allen A.; Cook, Leonard W.; Fleeker, James R.

doi:10.1016/s0003-2670(00)84724-8

Cited by 6 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The greatest disadvantage of steam distillation is the length of time necessary for complete recovery of most analytes. For example, steam distillation for the removal of 2.4-dichlorophenol residues from various plant materials requires a minimum of 2 h. 14 Supercritical fluid carbon dioxide is well suited to solubilizing isolated phenolic residues. Phenol and 2,4-dichlorophenol have been shown to have solubilities exceeding 0.01 and 0.10 mol fraction, respectively, in supercritical C02.…”

Section: Introductionmentioning

confidence: 99%

Supercritical carbon dioxide extraction of 2,4-dichlorophenol from food crop tissues

Thomson¹,

Chesney²

1992

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

Supercritical fluid extraction with carbon dioxide has been found to be effective for the isolation of residue levels (0.1-1 ppm) of 2,4-dichlorophenol from selected plant tissues. The 2,4-dichlorophenol residues were incompletely extracted with supercritical CO2 alone, since a substantial fraction of the 2,4-dichlorophenol was covalently attached to the plant matrix. An acid pretreatment procedure was developed to partially hydrolyze the plant tissue prior to extraction, releasing the bound 2,4-dichlorophenol residues. Steam distillation showed higher residue levels for field-treated straw samples. This is attributed to the greater degree of hydrolysis inherent in the steam distillation procedure. Supercritical CO2 extraction of field-treated seed samples showed higher levels of 2,4-dichlorophenol residues than did steam distillation. The supercritical fluid extractant was able to solvate 2,4-dichlorophenol residues in the interior of the seed and transport them to the surface for collection. The aqueous medium used in steam distillation was unable to penetrate the hydrophobic seed matrix to the same degree. While the actual extraction time experienced in supercritical fluid extraction was far less than that of steam distillation (45 min vs 6 h, respectively), the total sample preparation time was similar in both methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Supercritical carbon dioxide extraction of 2,4-dichlorophenol from food crop tissues

Thomson¹,

Chesney²

1992

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

Composite electrodes for electroanalysis: Principles and applications

1990

Self Cite

View full text Add to dashboard Cite

A composite electrode has a surface that consists of an ordered arrangement (array) or a random arrangement (ensemble) of conductor regions, typically micrometers in dimension, separated from one another by an insulator. These active regions (or microelectrodes) may themselves be of regular geometry and confined primarily to the surface, as with most array electrodes, or of irregular geometry and permeate the bulk of the material, as with most ensemble electrodes. In this review, we classify composite electrodes according to the distribution of a conductor and insulator within the material (or on the surface), survey a number of the fabrication schemes used to construct composite electrodes, discuss percolation theory as it applies to certain composite electrodes, examine the surface morphology of selected composite materials, discuss the origins of the enhancement in current density observed at many composite electrodes in both quiescent and flowing solutions, and provide a few examples illustrating the applications of composite electrodes t o real analytical problems.

show abstract

Detection of glucose at a rotating gold composite electrode by pulsed amperometric detection

1996

Self Cite

View full text Add to dashboard Cite

Segregated composite electrodes mimic microelectrode ensembles. In this preliminary report, the use of a rotating gold-polychlorotriRuoroethylene (or Kel-F, a 3M Company polymer) composite electrode in combination with pulsed amperometric detection (PAD) is described for the detection of glucose. Comparisons are made with results obtained at a solid gold disk electrode. The composite electrode exhibits a higher signal and a lower background than does the solid gold electrode. In terms of current density, the enhancement of the signal above the background is over 3-fold. similar to that observed with segregated graphite composite electrodes used in a constant potential mode. Little or no glucose signal is observed at either the solid gold or the gold composite elcctrode when employed in the constant potential mode. In the PAD mode, the signal is stable for periods in excess of an hour.

show abstract

Improved quantitation of 2,4-dichlorophenol in plant tissues by high-performance liquid chromatography with amperometric detection

Cited by 6 publications

References 18 publications

Supercritical carbon dioxide extraction of 2,4-dichlorophenol from food crop tissues

Supercritical carbon dioxide extraction of 2,4-dichlorophenol from food crop tissues

Composite electrodes for electroanalysis: Principles and applications

Detection of glucose at a rotating gold composite electrode by pulsed amperometric detection

Contact Info

Product

Resources

About