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Improved and simplified tissue extraction method for quantitating long-chain acyl-coenzyme A thioesters with
M J Mangino1, J Zografakis, M K Murphy
1Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110.
Journal of Chromatography
|May 20, 1992
Summary
A new method allows quick and sensitive extraction and quantitation of long-chain acyl-coenzyme A (acyl-CoA) thioesters in tissues using RP-HPLC. This technique is effective for small tissue samples and offers an efficient alternative for biological sample analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Molecular Biology
Background:
- Long-chain acyl-coenzyme A (acyl-CoA) thioesters are crucial in cellular metabolism.
- Accurate quantitation of acyl-CoA in biological tissues is essential for understanding metabolic pathways.
- Existing methods for acyl-CoA extraction and quantitation can be time-consuming and less sensitive.
Purpose of the Study:
- To develop a rapid, easy, and sensitive method for tissue extraction and quantitation of long-chain acyl-CoA thioesters.
- To validate the method using reversed-phase high-performance liquid chromatography (RP-HPLC).
- To assess the method's applicability to small tissue samples and its efficiency for high-throughput analysis.
Main Methods:
- Utilized a modified Bligh-Dyer technique for initial tissue homogenate extraction.
- Employed C18 extraction columns for further purification of acyl-CoA from the methanolic aqueous phase.
- Quantitated purified acyl-CoA esters using RP-HPLC with heptadecanoyl-CoA as an internal standard.
Main Results:
- Achieved sensitive detection of acyl-CoA esters with a limit of approximately 12 pmol.
- Successfully identified and separated ten distinct long-chain acyl-CoA esters (C12:0 to C20:4) from canine renal cortex and murine liver samples.
- Identified predominant acyl-CoA species in kidney and liver, including 14:0, 16:1, 16:0, 18:1, 18:2, and 20:4, with murine liver also showing 18:0.
- Confirmed the specificity of the detected peaks through alkaline hydrolysis, which resulted in their disappearance.
Conclusions:
- The developed method provides a simple, rapid, and sensitive approach for acyl-CoA thioester extraction and quantitation in biological tissues.
- The technique is suitable for analyzing small tissue samples (as low as 20 mg) and allows for processing multiple samples efficiently.
- This method serves as an attractive alternative for researchers needing to quantitate long-chain acyl-CoA thioesters in complex biological matrices.