bioactive anti cancer compound(s) in devil’s club: a ... polyacetylene.pdf · bioactive...
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Bioactive Anti‐Cancer Compound(s) in Devil’s Club: a Medicinal Plant of the Pacific Northwest
David Hasman1, Joe Tai2, Susan Cheung3, and Richard Smith41British Columbia Institute of Technology (Forensic Science Centre).2Child and Family Research Institute, UBC Dept. of Pathology Laboratory Medicine.3UBC Department of Pediatrics and Surgery.4University of Waterloo, Dept. of Chemistry.
Discussion
Use/Collection/Processing
Bioassay 3D Cell suspensions
LC/MS, MS/MS, and accurate mass (+) ESI
Overview LC/MS ESI, APCI, and APPI
Devil’s Club: “Oplopanax horridus”Araliacea family which contains Ginsengs.DC was formerly called Alaskan Ginseng
Cultural Linguistic Groups (Over 38):
First Nations Use of Devil’s Club
Mode of Use Inner Bark/Berries:
Chew inner bark
Infusion or Decoction (i.e. as a tea)
Mixed with berries as a paste (crush both together) and taken orally or applied externally to wounds
Nancy Turner et. al. Herbal Gram 2004; 62: 33‐48. American Botanical Council
Over 34 medicinal uses known Spiritual uses 8
Stem Processing for Inner Bark
Cut Stems Remove outer Bark Score longitudinal Peal Inner Bark Off
Dry @ 30oC 8 hrs
Grind - Extract 70% EtOH/H2O
Grind - Extract 95 oC H2O
LC/MS Profile Bioassay
ActivityLC Fractionation
MS and MS MS accurate mass
Human Panc‐1 Treated with Different Agents: 3D – 3 days
Control 40 M – mostly cells dead
DC extract
Gemcitabine1st line drug
10 M ‐ cells still viable
Paclitaxel2nd line drug
80 nM ‐ cells dead10 nM – cells still viable
1.5 µM ‐ cells still viable~ 6 µM ‐ cells dead~
Different Panc Cell Line
Chromatographic Profiles: 70 % EtOH Extract Inner Bark
[A: H2O B: AcN; A and B 0.05% formic acid]B: 10% 2 min, 40% 22 min, 60% 26 min, 100 % 40 min
210 nm
ESI Positive Ion TIC
mAU
TIC
5 10 15 20 25 30 35
ESI Negative Ion TIC
min
Frac 1 Frac 3Frac 2
Initial Mass Spectra Found
m/z200 400 600 800
227
245
285
326
387
471
489
507
530 60
562
3
675 71
573
375
1
978
996
972
min26 30 34 38
Coun
tsESI (+) Ion Spectra of Bioactive Compound
Agilent G1946D ESI(+)50‐1500 m/zVcap: 4.0 kVFragmentation voltage: 90Nebulizer gas: 10 l/minN2 temperature: 350 oC
m/z300 400 500 600
100
297
315
332 35
035
5
411
429
555
593
611
629
664
A: H2O; 0.05% formic acidB: AcN; 0.05% formic acidGradient 10 ‐100% B in 40 min4.6 x 150 mm Zorbax C18
Devil's Club Polyynes with Antibacterialand Antimycobacterial Activity
G.H.N. Towers et. al. J. Natural Products 1997, 60(11), 1210‐1213
OH
OH
OO
OH
OH
OO
Oplopandiol acetate (5)OH
OH
Oplopandiol (3)
Compound (4)
OH
Falcarinol (1)
OH
OH
Falcarindiol (2)
C17 H24 O : 244.4
C17 H24 O2: 260.4
C17 H26 O2 : 262.4
C20 H28 O4: 332.4
C20 H30 O4: 334.4
LC/MS Polyacetylene Positive Ion Spectral Characteristics
ESI, APCI positive ions reported in literature:
[M + Na]+; [M + K]+; [M + H]+; [2M + H]+, [M + NH4]+
[M – (n H2O) + H]+: n = 0,1,2…
[M – (n H2O) + m (CH3OH or AcN) + H]+ : n = 0,1,2..; m = 0,1,2..
ESI (+) Correlation to Observed IonsNominal Mass
“Tower’s Cmpds”m/z Ion Observed Proposed Correlation
[(M – 2H2O) + H]+
[(M – H2O) + H]+
[M – H2O + NH4]+ , ] ?
[2(M – 2H2O) + H]+
[M + NH4]+
[M + Na]+
[(M – 2H2O) + (M ‐ H2O) + H]+
[2(M – H2O) + H]+
297315
411429555593
332
629611
3554. 332
1. 2442. 2603. 262
5. 334
[(M – 2H2O) + (M – C3H4O ‐ H2O) + H]+
350
664 [M + (M – H2O + NH4)]+, ……?
[?]+
[?]+
M+
m/z280 320 360 400
%
0
100297 355.1882 (-0.9ppm [C20H28O4+Na]+)
315 353
331
371
356 399 411 429
350.2329 (-0.7ppm [C20H28O4+NH4]+)
m/z280 300 320 340 360
%
0
100297.1868
350.2331
332.2214315.1971
MS/MS of m/z 350 Ar@5eV
+ve ESI mass spectra of active peak – Waters QTof
Mass Corrected MS/MS [M + NH4]+ 350.2331
332.2214 (theoretical = 332.2226) loss of H2O from m/z 350 – 3.5 ppm
315.1971 (theoretical = 315.1960)loss of NH3 from m/z 332 +3.4 ppm
297.1868 (theoretical = 297.1854)loss of H2O from m/z 315 +4.5 ppm
m/z200 250 300 350
227
241
297
315
329
361
291
347
297
315
332
339 350
355
371
378
Positive Ion ESI; APCI; APPI [MeOH H2O]A
bund
ance ESI
[M+Na]+
[(M-2H2O)+CH3OH+H]+
[(M-2H2O)+2CH3OH+H]+
[(M-2H2O)+H]+
APCI APPI:toluene
350331
Abu
ndan
ce
Negative Ion ESI; APCI; APPI [MeOH H2O]
m/z200 300
313 33
1
347
377
364APCI
APPI:toluene
362
[M+O-H]-
[M-H]-
345
ESI
363
377
225
250
[M+CH3O•]-
[M+O•2]
-
Initial Identification of Compounds
min26 28 30 32 34 36 38
m/z 290
alcoh
ol
m/z 292
alcoh
ol m
/z 332
m/z 334
m/z 332 m
/z 260
m/z 262
m/z 222
6
m/z 222
7
m/z 278m
/z 292
m/z 244
1
2
3
4
5
1. Falcarinol 2. Falcarindiol 3. Opopandiol 4. Active cmpd 5. Opopandiol acetate6. cis Nerolidol 7. trans Nerolidol cmpds 6 and 7 confirmed by GC/MS and stds.
Coun
ts
Positive Ion Thoughts
Where does NH4+ come from? NH4
+ addition did not increase 350 m/z but did suppressed dimers.
Addition of metal ions (Na+) to indicate [M + Na]+ and M; search of – H2O.
Positive ion may predict number of OH groups and dimers can be useful for initial interpretation.
Different MS Sources do not necessarily give the same results.
LC and MS should be clean and mobile phase fresh.