APGC-MS, ASAP-MS, and MAI-MS: Expanding the Horizons of API-MS
DETECTION_OF_TOXIC_ALKOLOIDS_BY_LC-MS
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Transcript of DETECTION_OF_TOXIC_ALKOLOIDS_BY_LC-MS
Detection of Toxic Alkaloids by LC-MS
(Electron Impact)
Forensic Toxicology Research Unit
Forensic Chemistry Laboratory, Johannesburg
Department of Health
South Africa
Email: [email protected]
Department of Health
Introduction In South Africa extensive use is made of
traditional african medicine A large number of the plants used are known
to be toxic There is no formal training of herbalists or set
methods for preparing medicines There are few analytical methods available
for identifying toxic compounds in these traditional medicines
The Forensic Toxicology Research Unit was formed to develop analytical methods to identify and screen for toxic herbal compounds in biological matrices
Two african males from Standerton area were taken to a herbalist to be treated for “mental illness”
Both patients were treated with herbal enemas
Both patients became comatose and died within 3 hours of administration of the enemas
Viscera samples and plant bulbs were sent to the Forensic Chemistry Laboratory Johannesburg for chemical analysis
Case History
Sample PreparationPhosphate-buffered saline added
to homogenized sampleResultant solution filteredFiltrate added and drawn through
a Waters Oasis HLB cartridgeSample eluted from cartridge
with acetonitrile Evaporated to dryness and
reconstituted with 0.5 mL methanol
HPLC-MS Electron Impact
Identification of unknowns using GC-MS libraries (NIST, Wiley etc)
Small organic molecules ( 1000 Dalton)
Thermally labile compounds
104
102
101
103
105
Ionic
Nonpolar
Molecular Weight
Electrospray
APcI
ThermaBeamGC/MS
Application Ranges of MS Techniques
Polar
Cold Trap
Expansion Region
- 5000V
HeliumFused Silica Capillary
IonVolume
Filament
Extractor
Pre Filter Quadrupole FilterDynode
Multiplier
Signal
Exit Lens
IonizerMass Filter Ion Detector
10-5 - 10-6 TORR
2nd0.5 Torr
225
warm
+ 8V
- 30V - 10V 0 V
- 100V
-800 - -2500V
Gnd.
+ + + + + + ++ -
- -
70 eV
Nebulizer
Momentum Separator
FROM HPLC
1st 5 Torr
80°
65
150
RV18
RV18
Turbo Pump
Instrumental conditionsPump System Waters Alliance 2690
Mobile phase 95:5 water:ACN, ramping to 10:90 MeOH:ACN in 35 minutes
Column Phenomenex Aqua C18 250x2mm
Detector(s) Waters 996 PDAWaters Thermabeam Mass detector
Inte
nsity
0.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035
0.040
Minutes
0.00 10.00 20.00 30.00 40.00 50.00 60.00
14.3
9115
.974
Colon extract @ 301m/z
Inte
nsity
0.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035301.30
Inte
nsity
0.0000
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0.0009
m/z
50.00 100.00 150.00 200.00 250.00 300.00 350.00
56.0557.04
91.10115.14
203.17
217.23
229.30
258.17
301.24
NIST match for Buphanamin
1 4 . 3 9 2 2 B u p h a n a m i n
5 0 7 0 9 0 1 1 0 1 3 0 1 5 0 1 7 0 1 9 0 2 1 0 2 3 0 2 5 0 2 7 0 2 9 0 3 1 0
0
1 0 0
1 0 0
5 5 6 3 7 7
8 9
9 1
1 0 2
1 0 3
1 1 5
1 2 1
1 2 7
1 3 1
1 4 1
1 4 5 1 6 5
1 6 5
1 7 5
1 7 9
1 9 0
1 9 0
2 0 4
2 0 4
2 1 8
2 1 8
2 3 1
2 3 1
2 4 4
2 4 4
2 5 6
2 5 6
2 7 2
2 7 2
2 8 2
2 8 2
3 0 1
3 0 1
Forward Search 879 Reverse Search 952 Probability 90.4%
NIST match for Powelline
1 5 . 9 7 0 1 P o w e l l i n e
5 0 7 0 9 0 1 1 0 1 3 0 1 5 0 1 7 0 1 9 0 2 1 0 2 3 0 2 5 0 2 7 0 2 9 0 3 1 0
0
1 0 0
1 0 05 6
5 7 6 7
7 7
7 9 9 1
9 1
1 0 2
1 0 2
1 1 5
1 1 5 1 2 7
1 2 8
1 4 1
1 5 3
1 5 7
1 7 1
1 8 9
1 9 0 2 0 3
2 0 3
2 1 7
2 1 7
2 2 9
2 2 9
2 4 4
2 4 6 2 5 8
2 5 8
2 7 2
2 7 2
2 8 4
2 8 4
3 0 1
3 0 1
Forward Search 809 Reverse Search 811 Probability 76.3%
Alkaloids detected in viscera samples using the TMD
Alkaloid Stomach 1 Liver 1 Kidney 1 Liver 2 Kidney 2 Colon 2
Buphanamin -
Buphanisine - -
Buphandrin
Nerbowdin-3-Acetyl
- - - - - -
Amberline - - - - - -Powelline - - - -
Chlidanthine, 1,2-dihydro
- - - - - -
HPLC-MS Chromatogram of Boophane disticha bulb extract
Inte
nsity
0.00
1.00
2.00
3.00
4.00
5.00
6.00
Minutes
0.00 10.00 20.00 30.00 40.00 50.00 60.00
12.4
0213
.482
14.2
7214
.726
15.5
2816
.230
16.4
4317
.178
18.8
6520
.784
22.1
0922
.474
22.9
9223
.646
24.2
6924
.655
25.4
7826
.001
26.4
6127
.059
28.1
5328
.386 29
.339
29.9
91
33.8
1735
.773
Total Ion Chromatogram
Inte
nsi
ty
0.000
0.010
0.020
0.030
0.040
0.050
0.060
0.070
0.080
0.090
Minutes0.00 10.00 20.00 30.00 40.00 50.00 60.00
14
.30
615
.74
017
.17
71
8.7
81
Boophane disticha bulb extract @ 301m/z
Inte
nsity
0.00
0.02
0.04
0.06
0.08
138.03 282.18
301.10
Inte
nsity
0.000
0.001
0.002
0.003
0.004
167.91
216.93
229.05
301.06
Inte
nsity
0.00
0.05
0.10
0.15
0.20
m/z
50.00 100.00 150.00 200.00 250.00 300.00 350.00
129.98215.00
228.04
231.06
245.08
260.18 284.20300.10
315.10
1 4 . 3 0 5 5 B u p h a n a m i n
5 0 7 0 9 0 1 1 0 1 3 0 1 5 0 1 7 0 1 9 0 2 1 0 2 3 0 2 5 0 2 7 0 2 9 0 3 1 0
0
1 0 0
1 0 0
5 3 6 3 8 1 8 9
8 9 1 0 2
1 0 9
1 1 5
1 2 7
1 2 7
1 3 8
1 4 1
1 5 4 1 6 5
1 6 5
1 7 8
1 7 9
1 9 0
1 9 0
2 0 4
2 0 4
2 1 8
2 1 8
2 3 1
2 3 1
2 4 2
2 4 4
2 5 6
2 5 6
2 7 2
2 7 2
2 8 2
2 8 2
3 0 1
3 0 1
1 8 . 7 7 9 2 B u p h a n d r i n
5 0 7 0 9 0 1 1 0 1 3 0 1 5 0 1 7 0 1 9 0 2 1 0 2 3 0 2 5 0 2 7 0 2 9 0 3 1 0 3 3 0
0
1 0 0
1 0 0
5 5
5 5
6 3
6 3
7 1
7 1
8 9
9 1
1 0 1
1 0 1
1 1 5
1 1 5
1 3 0
1 3 0
1 4 1
1 4 1 1 5 3
1 5 9
1 6 5
1 8 7
1 8 7
2 0 2
2 0 2
2 1 5
2 1 5
2 2 8
2 3 1
2 4 5
2 4 5
2 6 0
2 6 0
2 7 2
2 7 2
2 8 4
2 8 4
3 0 0
3 0 0
3 1 5
3 1 5
1 5 . 7 3 6 1 P o w e l l i n e
5 0 7 0 9 0 1 1 0 1 3 0 1 5 0 1 7 0 1 9 0 2 1 0 2 3 0 2 5 0 2 7 0 2 9 0 3 1 0 3 3 0
0
1 0 0
1 0 0
5 6
5 67 7 9 1
9 7
1 0 21 1 5 1 2 7 1 4 1 1 5 7
1 6 81 8 7
1 8 9
2 0 3
2 0 3
2 1 7
2 1 7
2 2 9
2 2 9
2 4 4
2 4 6 2 5 8
2 5 8 2 7 2 2 8 4
3 0 1
3 0 1
3 1 5 3 3 3
Compound Detected (NIST MS Search 2.0 )
Forward Search
Reverse Search
% Probability
Chlidanthine, 1,2-dihydro 674 710 72.7
Buphanamin 867 966 68.4
Crinan-11-ol,1,2-didehydro-3,7-dimethoxy-{3,11S}
860 867 98.0
Powelline 499 509 63.2
Oxopowelline 726 822 75.2
Buphanisine 874 874 94.5
Buphandrin 910 910 97.5
Confirmation HPLC-MS with GC-TOFMS
Alkaloid HPLC-MS GC-TOFMS
Buphanamin
Buphanisine
Buphandrin
Nerbowdin-3-Acetyl
-
Amberline -
Powelline
Chlidanthine, 1,2-dihydro
The way forward
No commercial standards available to determine limits of detection (5-30ng on column?)
Large volume extract to be prepared & fractionated using Waters FractionLynx
Purified fractions to be chemically characterized using NMR & HPLC-MS
% Recovery, LOD & LOQ to be established Electron Impact technology is compatible with
HPLC and is an excellent screening technique for unknown compounds
Acknowledgements
TIAFT Organising committee Rand Afrikaans University, particularly
Professor B-E van WykProfessor F R van Heerden
Microsep (PTY) LTD CSIR LECO SA Paul Steenkamp
Department of Health