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Forensic
Applications
Clonazepam and 7-Aminoclonazepam in Urine
for GC or GC/MS Confirmations
Using 200mg 10mL HyperSep Verify-CX Extraction Column
(Part Number: 60108-742)
Prepare Sample –
β
-Glucuronidase Hydrolysis
To 2mL of urine add internal standard(s)* and 1mL of
β
-Glucuronidase
β
-Glucuronidase: 5,000 F units/mL Patella vulgate in
100mM acetate buffer (pH 5.0)
Mix/vortex
Hydrolyze for 3 hours at 65°C
Cool before proceeding
Condition Verify-CX Extraction Column
3mL of CH
3
OH then aspirate
3mL of DI H
2
O then aspirate
1mL of 100mM phosphate buffer (pH 6.0) then aspirate
NOTE:
Aspirate at <3"Hg to prevent sorbent drying
Apply Sample
Load sample at 1 to 2mL/minute
Wash Column
2mL of DI H
2
O
2mL of 20% acetonitrile in 100mM phosphate buffer
(pH 6.0)
Dry column (5 minutes at >10"Hg)
2mL of hexane
Elute Clonazepam and 7-Aminoclonazepam
3mL of ethyl acetate With 2% NH
4
OH
Collect eluate at 1 to 2mL/minute
NOTE:
Prepare elution solution fresh daily
Dry Eluate
Evaporate to dryness at <40°C
Derivatize
Add 50µL ethyl acetate and 50µL MTBSTFA (with 1%
TBDMCS)***
Mix/vortex
React for 20 minutes at 90°C
Remove from heat source to cool
NOTE:
Do not evaporate MTBSTFA solution
Quantitate
Inject 1 to 2µL onto gas chromatograph
For mass spectrometry, monitor the following ions (GC/MS):
Compound
Primary Ion** Secondary
Tertiary
Clonazepam-TBDMS
372
374
326
7-Aminoclonazepam-TBDMS
342
344
399
Clonazepam-D4-TBDMS
376
378
377
7-Aminoclonazepam-D4-TBDMS 346
348
403
* Suggested internal standard
** Quantitation ion
*** Part number TS-48927 (10 x 1mL ampules)
Recommended GC Columns
Part Number
TRACE TR-DoA5 Column, 15m x 0.25mm x 0.25µm
26AF130P
TRACE TR-DoA35 Column, 15m x 0.20mm x 0.33µm
26AC497P