Extraction of THC and Metabolites from Plasma Using ISOLUTE SLE+ Columns and (96-well Plates with LC–MS–MS Analysis - - Chromatography Online
Extraction of THC and Metabolites from Plasma Using ISOLUTE SLE+ Columns and (96-well Plates with LC–MS–MS Analysis

The Application Notebook

A simple and efficient supported liquid extraction (SLE) procedure for the extraction of THC and metabolites from human plasma at low levels has been developed. ISOLUTE SLE+ columns and plates offer a simple, fast and effective alternative to traditional liquid-liquid extraction providing high analyte recoveries, eliminating emulsion formation and minimizing matrix effects in LC–MS–MS analysis.

Introduction

Widespread legislation against the use of cannabis has led to the necessity for rapid and reliable methods for the analysis and quantification of cannabinoids and metabolites. The most prevalent markers in biological samples taken from cannabis abusers are Δ9tetrahydrocannanbinol (THC), cannabidiol, cannabinol in addition to the major THC metabolites; 11-hydoxy-Δ9-THC and 11-nor-9-carboxy-Δ9-THC.

This application note describes the extraction of THC and metabolites from a 200 無 plasma sample using the ISOLUTE SLE+ 200 96-well plate (part #820-0200-P01). Method parameters have been optimized to maximize recoveries and minimize ion suppression in LC–MS analysis.

Experimental

Supported liquid extraction

Sample pre-treatment: Dilute 100 無 plasma sample 1:1 (v/v) with 1% aqueous formic acid.

Sample loading:           Load pre-treated plasma (200 無) samples onto the plate and apply a pulse of vacuum to initiate flow. Leave the samples to absorb for 5 minutes.

Analyte elution:           Elution 1: Apply 500 無 dichloromethane, then a short pulse of vacuum and wait 5 minutes.

                                 Elution 2: Apply a further 500 無 aliquot of dichloromethane, wait 5 minutes then apply a short pulse of vacuum to ensure complete elution.

Post extraction:          Evaporate eluate to dryness and reconstitute in 500 無 of 0.1% formic acid in water/acetonitrile (50:50, v/v).

LC–MS–MS

Instrument:             Waters Acquity UPLC (Waters Corp., Milford, Massachusetts, USA)

Column:               Acquity UPLC BEH C18 column (1.7 痠, 100 2.1 mm i.d.) (Waters)

Mobile phase:         A: 0.1% formic acid aq and B: 0.1% formic acid in methanol. Run isocratically at a flow-rate of 0.5 mL/min 10% A and 90% B

Injection volume:         5 無

Column temperature:         35 蚓

Instrument:               Quattro Premier XE triple quadrupole mass spectrometer (Waters Corp., Manchester, UK) equipped with an electrospray interface for mass analysis

Desolvation temperature: 450 蚓

Ion source temperature: 150 蚓

Collision gas pressure: 3.46 10–3 mbar

Results


Figure 1: SRM chromatogram of extracted THC and metabolites.
Recoveries above 80% with RSDs below 10% (n = 6) were demonstrated for all analytes. Figure 1 shows the SRM chromatogram of THC and metabolites extracted from human plasma using this procedure.





Conclusions

This method demonstrates robust and effective extraction of THC and metabolites using ISOLUTE SLE+ 200 96-well plates. The method can easily be scaled up and optimized for larger sample volumes (up to 1 mL) using ISOLUTE SLE+ columns.

References

1. L. Williams, Extraction of THC and metabolites from Plasma using ISOLUTE SLE+, Application Note AN 723, available from http://www.biotage.com/ (2010).




Biotage AB
Kungsgatan 76 , SE-753 18 Uppsala, Sweden
tel.: +46 18 56 59 00 fax: +46 18 59 19 22
E-mail:
Website: http://www.biotage.com/

ADVERTISEMENT

blog comments powered by Disqus
LCGC E-mail Newsletters
Global E-newsletters subscribe here:




 

LCGC COLUMNISTS 2014

Sample Prep Perspectives | Ronald E. Majors:

LCGC Columnist Ron Majors, established authority on new column technologies, keeps readers up-to-date with new sample preparation trends in all branches of chromatography and reviews developments in existing technology lines.

LATEST: The Role of Selectivity in Extractions: A Case Study

History of Chromatography | Industry Veterans:

With each installment of this column, a different industry veteran covers an aspect of the evolution and continued development of the science of chromatography, from its birth to its eventual growth into the high-powered industry we see today.

LATEST: Georges Guiochon: Separation Science Innovator

MS — The Practical Art| Kate Yu:
Kate Yu is the editor of 'MS-The Practical Art' bringing her expertise in the field of mass spectrometry and hyphenated techniques to the pages of LCGC. In this column she examines the mass spectrometric side of coupled liquid and gas-phase systems. Troubleshooting-style articles provide readers with invaluable advice for getting the most from their mass spectrometers.

LATEST: Mass Spectrometry for Natural Products Research: Challenges, Pitfalls, and Opportunities


LC Troubleshooting | John Dolan:

LC Troubleshooting sets about making HPLC methods easier to master. By covering the basics of liquid chromatography separations and instrumentation, John Dolan, Vice President of LC Resources and world renowned expert on HPLC, is able to highlight common problems and provide remedies for them.

LATEST: LC Method Scaling, Part I: Isocratic Separations

More LCGC Chromatography-Related Columnists>>

LCGC North America Editorial Advisory Board>>

LCGC Europe Editorial Advisory Board>>

LCGC Editorial Team Contacts>>


Source: The Application Notebook,
Click here