PubMed HealthSearch

PubMed · 8123746

Liquid chromatography solvent optimization: potential pitfalls when using a black box for developing a quality separation.

Abstract

ICOS and DIAMOND are two commercially available, semi-automated HPLC solvent optimization software packages. The resultant optimized chromatographic separation is dependent on a combination of the operator's objective, the capability of the software system and the appropriateness of the data input. The latter contains components that represent the match between the requirements of the algorithms used and the information content of the data on which those algorithms operated. Knowledge about the sample content, stability and potential sample-solvent interactions can have a significant effect on the quality of the optimal solvent composition that is calculated. The results generated during the optimization of the separation of a mixture of U-83,757 and a variety of related compounds illustrate the need to consider the significance of the contribution to the calculated optimal separation of each of these potential pitfalls, both individually and in combination with the mode of operation of the relevant algorithms. Our results indicate that the quality of the final result is highly dependent on the intelligence content of the data used.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

P B Bowman, J T Hann, J G Marr, D J Salvat, B E Thompson. Liquid chromatography solvent optimization: potential pitfalls when using a black box for developing a quality separation.. https://doi.org/10.1016/0731-7085(93)80116-i

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Biocatalytic oxidation of polycyclic aromatic hydrocarbons by hemoglobin and hydrogen peroxide.

Hemoglobin is able to oxidize polycyclic aromatic hydrocarbons, PAH's, in presence of hydrogen peroxide. Among 12 aromatic compounds tested, six were oxidized; anthracene, carbazole, dibenzothiophene, fluorene, 9-hexylanthracene and pyrene. The products were identified as aromatic ketones and sulfoxides. Effect of organic solvent concentration and hemoglobin stability were determined.

Acetonitriles

Treatment with letrazuril of refractory cryptosporidial diarrhea complicating AIDS.

Thirty-five AIDS patients (mean CD4 count 44 x 10(6)/L) with chronic cryptosporidiosis were treated with letrazuril at an initial oral daily dose of 50 mg in an open-label Phase I prospective trial. Treatment was continued for > or = 10 days and for as long as there was a response. The majority of subjects (91%), had previously failed paromomycin treatment. At baseline, 74% of patients had moderate (five to nine bowel movements per day) to severe (> 10 bowel movements per day) diarrhea. Twenty-three subjects (66%) had a clinical response within a mean of 1.7 weeks of treatment initiation. Twenty-two patients had a partial response (> 50% reduction in bowel movements per day for > or = 1 week), one patient had a complete response (two or fewer bowel movements per day). Of the responders, 15 (65%) had a clinical relapse with worsening diarrhea at an average of 1.2 months following initiation of letrazuril. The other eight (35%) had had symptom control for an average of 2.9 months from initiation of letrazuril to the latest follow-up. Microbiologic eradication was demonstrated in 10 (40%) of 25 patients with follow-up stool examinations. Seven patients (20%) experienced a rash, all within 1 week of starting the drug, and resolved in all patients when the drug was discontinued. In conclusion, severely immunocompromised AIDS patients with refractory cryptosporidiosis may show a modest, short-lived response to letrazuril. Microbiologic response is variable and relapse high. Rash is a major limiting side effect of the drug.

Acetonitriles

Determination of the retinobenzoic acid derivative Am580 in rat plasma by high-performance liquid chromatography.

A specific liquid chromatographic method for the determination of 4-[[(5,6,7,8,8-tetrahydro-5,5,8,8-tetramethyl-2- naphthalenyl)carbonyl]amino]benzoic acid (Am580) in rat plasma is described. The procedure includes one-step isolation of the compound and the internal standard (naphthol AS) from protein precipitated with acetonitrile, resolution on a reversed-phase column (Supelcosil LC18-DB, 5 microns) with water-acetonitrile-methanol-n-butanol (45:40:14:1, v/v) containing 65 mM ammonium acetate as elution system and UV absorbance detection at 280 nm. The assay was linear over a wide range (25-5000 ng ml-1) and the limit of quantitation was 25 ng ml-1 using 0.2 ml of plasma. It was precise and reproducible enough for pharmacokinetic studies. Application to a preliminary disposition study in the rat indicated that Am580 was characterized by a relatively large apparent volume of distribution (1.1-1.5 1 kg-1) and small clearance (8.8-9.7 ml min-1 kg-1). Its pharmacokinetic behaviour was linear within the dose range considered (2 and 10 mg kg-1, i.p.).

Acetonitriles