High-performance liquid chromatographic determination of intrathecally administered [D-Ala2-D-Leu5]-enkephalin concentrations in canine cerebrospinal fluid.
A rapid and useful method for high-performance liquid chromatographic analysis of exogenous [D-Ala2-D-Leu5]-enkephalin (DADLE) in cerebrospinal fluid (CSF) is described. CSF (0.5 ml) samples were filtered using a 0.22-micron Co-Star filter. Chromatography was performed on a mu Bondapak C18 column using a mobile phase of A, 0.05 M sodium phosphate (monobasic, pH 6.0) and B, 60% acetonitrile in 0.05 M sodium phosphate (pH 6.0) with a flow-rate of 1 ml/min. Absorbance at 210 nm was measured. The procedure produced a linear curve for the concentration range 1-10 micrograms/ml. The development of the assay produced rapid, repeatable and accurate results for CSF analysis of DADLE at concentrations achieved with therapeutic administration of the peptide. This method could also be used in the future for analysis of compounds like DADLE.
Department of Environmental Practice, College of Veterinary Medicine, University of Tennessee, Knoxville 37901.
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Cox
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Harvey
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Frazier
D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000706:statistics & numerical data; D004285:Dogs; D016308:Enkephalin, Leucine-2-Alanine / Q000008:administration & dosage / Q000134:cerebrospinal fluid*; D011786:Quality Control; D012680:Sensitivity and Specificity
D016308:Enkephalin, Leucine-2-Alanine