Improved Method for the Analysis of 31 Drugs of Abuse in Oral Fluid samples using the eXtreme|FV® by LC-MS/MS

Nadine Koenig1, Crystal Xander1, Melanie Stauffer1, Dean Fritch2
1Health Network Laboratories, Allentown, PA
2OraSure Technologies, Inc,. Bethlehem, PA
Presented at MSACL 2015

Introduction

The goal of this study was to improve the sample preparation for the analysis of drugs of abuse/pain management panels in oral fluids. The oral fluid samples were collected with Intercept® i2he™ Oral Fluid Collection Devices. The diluted oral fluid samples were filtered using Thomson Filter Vials, followed by LC/MS/MS analysis. The most critical aspects of reliable Oral Fluid analysis are the reduction of interferences from the sample matrix and analyte recovery. Traditionally, SPE, SLE and centrifugation have been used to reduce matrix interference prior to MS analysis. However, these techniques are time consuming, adversely impact recovery, require expensive consumables and equipment and use large amounts of solvent. Thomson eXtreme® Filter Vials (patented) offer multi-layer filtration for viscous samples and samples containing up to 30% solid particulates.

Equipment

Improved Method: 31 Drugs

  • Eppendorf MixMate®
  • Thomson 48 position Vial Filter Press (Part # 35015)
  • AB Sciex 4500 Mass Spectrometer
  • Shimadzu Prominence HPLC equipped with:
    • Autosampler: SIL-20AC HT
    • Pumps A, B: LC-20AD
    • Communication Bus Module: CBM-20A
    • Column Oven: CTO-20A
    • Degasser: DGU-20A5R
  • 31 Analytes, see Table 1:
    • Column: Restek Ultra Biphenyl Columns (5µm, 50 x 2.1 mm)
      • Mobile Phases:
        • A: 0.1% Formic Acid in HPLC Water
        • B: 0.1% Formic Acid in Methanol
      • Flow Rate: 0.5 mL/min
      • Injection Volume: 15µL

Obsolete Method: 4 drugs

  • Caliper Life Sciences Turbo-Vap® Concentration Workstation
  • Rapid Trace® Solid Phase Extraction Workstation
  • Vortex Mixer
  • AB Sciex 3200 Mass Spectrometer
  • Shimadzu Prominence HPLC
    • Autosampler: SIL-20AC HT
    • Pumps A & B: LC-20AD
    • Communication Bus Module: CBM-20A
    • Column Oven: CTO-20AC
    • Degasser: DGU-20A5
  • Morphine and BZE
    • Column: Restek Ultra Biphenyl (5µm, 50 x 2.1mm)
      • Mobile Phases:
        • A: 0.1% Formic Acid in HPLC Grade Water
        • B. 0.1% Formic Acid in HPLC Grade Methanol
      • Flow rate: 0.5 mL/min
      • Injection Volume = 30µl
  • PCP and Methadone
    • Column: Restek Allure Biphenyl (5µm 50 x 2.1mm)
      • Mobile Phases (Isocratic 10% Water in Methanol):
        • A: 0.1% Formic Acid in HPLC Grade Water
        • B. 0.1% Formic Acid in HPLC Grade Methanol
      • Flow rate: 0.3 mL/min
      • Injection Volume: 30µl

Improved Sample Preparation:

  1. Allow standards, specimens and control to come to room temperature.
  2. Add 100 µL of 10% Methanol / Water
  3. Add 100 µL of Standard/Control/oral fluid sample + 10uL Internal Standard
  4. Place Thomson Filter Plunger on top of the Thomson vial, Thomson vials –eXtreme/FV® 0.2µm PVDF, w/Pre-Slit Red Cap (p/n #85531)
  5. Press filter plunger down approximately ¼ of the way into each of the Thomson Vial outer shells.
  6. Vortex for 10 seconds using the Eppendorf MixMate®.
  7. Press Filter plunger the rest of the way down using the Thomson 48 position Vial Filter Press.
  8. Extracts are ready for LC/MS/MS analysis using the Shimadzu / AB Sciex 4500

Obsolete Sample Preparation:

  1. Allow standards, specimens and control to come to room temperature.
  2. To appropriately labeled 13 x 100 mm tubes add 3 mL of 50mM Phosphoric Acid.
  3. Prepare the 13 x 100 mm tubes for analysis. Standards/Controls/Patient Samples
  4. Vortex for 10 seconds.
  5. The tubes are now ready for automated extraction using on the Caliper Life Sciences Turbo-Vap® Concentration Workstation
  6. After the elution is complete on the Rapid Trace®, remove the racks with the tubes intact.
  7. Add 50µL of 1% HCL in Methanol to each tube.
  8. Vortex for 15 seconds.
  9. The original sample tubes and the used SPEC DAU Columns can be discarded.
  10. Take to dryness at 55ºC in the Caliper Life Sciences Turbo-Vap®.
  11. Reconstitute samples by adding 1 mL of 10% HPLC Grade Methanol in Water to all tubes.
  12. Vortex for 15 seconds.
  13. Extracts are ready for LC/MS/MS analysis using the Shimadzu / AB Sciex 3200

Results:

The improved method utilizes the Thomson eXtreme Filter Vials for sample clean-up significantly reducing the cost and time of per sample analysis. This method was validated for all the analytes in Table 1. Mass spectrum of all the analytes in Table 1 can be seen in Fig. 1. Table 2 shows the 4 drugs that were analyzed in oral fluid by the obsoleted method. Linearity of the assay, ion suppression and drug recovery for analytes in table 1. were calculated using unextracted standards (neats) run along with 3 different negative patient samples, extracted and spiked with standard and internal standard post extraction at the cutoff concentration to access ion suppression and drug recovery. To calculate drug recovery, the mean area counts of the extracted samples was compared to the mean area counts of the unextracted samples. To determine ion suppression, the mean concentration of the extracted samples was compared to the mean concentration of the post-extracted samples. Final concentrations of the drugs can be seen in table 3.

The following 31 drugs in oral fluid will be analyzed by this Improved Method

Table.1The following 31 drugs in oral fluid will be analyzed by this Improved Method
6-Monoacetylmorphine (6-MAM)7-Aminoclonazepam (7AMINO)Alprazolam (ALPR)
Amphetamine (AMPH)Benzoylecgonine (BE)Buprenorphine (BUP)
Carisoprodol (CARIS)Clonazepam (CLONZ)Cocaine
Codeine (CODE)Diazepam (DIAZ)Fentanyl (FENT)
Hydrocodone (HCOD)Hydromorphone (HMOR)Lorazepam (LOR)
Meprobamate (MEPRO)Methadone (MTHD)Methamphetamine (MAMP)
Methylenedioxyamphetamine (MDA)Methylenedioxymethamphetamine (MDMA)Morphine (MORP)
Norbuprenorphine (NBUP)Nordiazepam (NDIAZ)Norfentanyl (NFENT)
Oxazepam (OXAZ)Oxycodone (OCOD)Oxymorphone (OMOR)
Phencyclindine (PCP)Temazepam (TEM)Zolpidem (ZOLP)
α-hydroxy-Alprazolam (OH-AL)

The following analytes were analyzed in the Obsolete Method

Table.2The following analytes were analyzed in the Obsolete Method
Benzoylecgonine (BE)Phencyclindine (PCP)
Methadone (MTHD)Morphine (MORP)

Final concentrations for the various analytes are as follows:

Table.3Final concentrations for the various analytes are as follows:
AMPH*
MAMP
MDA
MDMA
(ng/mL)
7-AMINO
CLONZ
ALPR
OH-AL
DIAZ
NDIAZ
TEM**
OXAZ**
LOR**
ZOLP
(ng/mL)
CODE
MORP
HCOD
HMOR
OCOD
OMOR
MTHD
(ng/mL)
COKE
BZE
(ng/mL)
Level 1100.552
Level 2201104
Level 3502.52510
Level 410055020
Level 550025250100
Level 625001251250500
Level 7500025025001000
Table.3.5* Cutoff concentration for Amphetamine is 20ng/mL
** Cutoff concentration for Temazepam, Oxazepam, Lorazepam and Buprenorphine are 5ng/mL
All units are in diluted oral fluid concentrations. Multiply results by three to convert to neat oral fluid.
PCP
THC
(ng/mL)
6MAM
FENT
NFENT
(ng/mL)
CARIS
MEPRO
(ng/mL)
BUP
NBUP**
(ng/mL)
Level 10.250.5201
Level 20.51402
Level 31.252.51005
Level 42.5520010
Level 512.525100050
Level 662.51255000250
Level 712525010000500
orasure mass spec 1

fig.1Mass Spectrum - Level 4

orasure mass spec 2

fig.1.5Mass Spectrum - Level 4 (continued)

Conclusion:

This validated method alleviates the need for sample clean-up by SPE or SLE thereby reducing the amount of equipment required, solvent usage and sample preparation time. Samples are filtered by pipetting the sample into the filter vial shell, inserting the plunger into the shell, and then pushing the plunger into the shell. The filtration process from sample pipetting to autosampler ready only requires 15 seconds. Benefits to the use of Thomson eXtreme® Filter Vials include lower cost, faster sample preparation time, less use and disposal of organic solvents.

Thomson Instrument Company is not affiliated with SCIEX, Shimadzu Corporation, Phenomenex Inc., Biotage, Restek Corporation, Eppendorf, Health Network Laboratories, OraSure Technologies, Inc or their products

Title

Improved Method for the Analysis of 31 Drugs of Abuse in Oral Fluid samples using the Thomson eXtreme|FV® by LC-MS/MS

Description

The goal of this study was to improve the sample preparation for the analysis of drugs of abuse/pain management panels in oral fluids. The oral fluid samples were collected with Intercept® i2he™ Oral Fluid Collection Devices. The diluted oral fluid samples were filtered using Thomson Filter Vials, followed by LC/MS/MS analysis.

PDF Application

Product Used in Application

eXtreme|FV® - PVDF 0.2µm

eXtreme|FV® - PVDF 0.2µm

Pre-Split Septum, Red Cap

pn#85531-200

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