Presentation - Isobaric PEG systems
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Transcript of Presentation - Isobaric PEG systems
Travelling Wave Ion Mobility Studies of Polymer
Microstructure
Jim Scrivens
Challenges in characterising polymer
formulations• Extremely complex mixtures• Variation of starting materials• Poorly controlled reactions• Molecular weight range• Sold on properties not structure• Chromatographic separation
difficult
Requirement
• Rapid analysis• High information content• Molecular weight and structural
information• Ability to differentiate small
differences in complex formulations
Ion mobility platforms
• Drift cell– Currently predominately academic based
• Differential mobility spectroscopy (DMS)– Includes FAIMS– Theory challenging
• Travelling wave– Commercially available– Theory challenging
Ion mobility issues
• Sensitivity• Speed • Selectivity• Ease of use• Resolution• Availability
• Information content
• Reproducibility• Calibration• Cost• Data analysis
References
• Ion mobility–mass spectrometry– Abu B. Kanu, Prabha Dwivedi, Maggie Tam, Laura Matz and Herbert H.
Hill Jr.– J. Mass Spectrom. 2008; 43: 1–22
• Differential Ion Mobility Spectrometry: Nonlinear Ion Transport And Fundamentals Of FAIMS– Alexandre A Shvartsburg– CRC Press, ISBN: 9781420051063, 2008
Travelling Wave References
• An investigation of the mobility separation of some peptide and protein ions using a new hybrid quadrupole/travelling wave IMS/oa-ToF instrument– Steven D. Pringle , Kevin Giles , Jason L. Wildgoose , Jonathan P.
Williams , Susan E. Slade , Konstantinos Thalassinos , Robert H. Bateman , Michael T. Bowers and James H. Scrivens
– International Journal of Mass Spectrometry, 261, 1-12, 2007
• Applications of Travelling Wave Ion Mobility-Mass Spectrometry – Konstantinos Thalassinos and James H Scrivens– Practical Aspects of Trapped Ion Mass Spectrometry Volume 5, 2009
• Special issue of IJMS on Ion Mobility– Edited by Richard Yost, James Scrivens– IJMS, 2010
Pringle, S. D. et al., International Journal of Mass Spectrometry, 261, 1-12, 2007Thalassinos K and Scrivens J H, “Applications of Travelling Wave Ion Mobility-Mass Spectrometry”, Practical Aspects of Trapped Ion Mass Spectrometry Volume 5
Schematic of Synapt G1
Features of Synapt
• Ease of use
• Rapid analysis (typically 200 spectra in 18ms)
• High sensitivity (fmole)
• Can acquire MS, MS/MS with accurate mass data
• Estimated relative cross-sections can be obtained by use of calibration against known standards
Aspirations
• Higher mobility resolution
• Better dynamic range
• Higher resolution mass spectrometry
• No compromise in: -– Sensitivity– Speed– Ease of use
Schematic of Synapt G2
TOF developments
QuanTof improvements— High field pusher — Dual stage reflectron — Hybrid ion detection system — compatible with UPLC separations— compatible with HDMS analysis
Performance— Resolution – over 40,000 FWHM— Mass Measurement – 1ppm RMS— Dynamic Range – up to 105
— Speed - 20 Spectra/sec
Mobility Cell improvements
Second generation Triwave device— Increased ion mobility
resolution (over 40 Ω/ΔΩ) IMS cell 40% longer Higher gas pressure in IMS T-
Wave (2.5mb versus 0.5mb) Modified T-Wave pattern - use of
Higher T-Wave pulse amplitudes/fields
Helium cell balances N2
pressure in Maximizes transmission of ions on entry into the mobility cell
Rabbit haemoglobin peptide Synapt G1
20 40 60 80 100 120 140 160 180 200Scan
99
84
115
81
76 m/z 977
m/z 857
m/z 1037
m/z 1134
Rabbit haemoglobin peptide Synapt G2
20 40 60 80 100 120 140 160 180 200Scan
102
89
110
86
84 m/z 977
m/z 857
m/z 1037
m/z 1134
Rabbit haemoglobin peptide ATD comparison
20 40 60 80 100 120 140 160 180 200Scan
99
84
81
76
102
89
86
84
Synapt G2
m/z 977
m/z 857
m/z 1037
m/z 1134
Positive ion [M+Na]+ ESI mass spectrum of N-glycans released from chicken
ovalbumin
Ion mobility separations of positive ions [M+Na]+ of N-glycans released from chicken ovalbumin with
compositions of Hex3GlcNAc2 Hex3GlcNAc3 (two isomers) and Hex3GlcNAc4
Ion mobility separations of positive ions [M+Na]+ of N-glycans released from chicken ovalbumin with compositions of Hex3GlcNAc2 Hex3GlcNAc3 (two
isomers) and Hex3GlcNAc4
Positive ion [M+Na]+ ion mobility MS/MS spectra of the first and second N-glycan isomers of m/z 1136
from chicken ovalbumin
EESI of aerosol formulations
Sample
Sample headspace
Solvent
Desolvation Gas plus analyte
Sample molecules
Charged solvent droplets
Desolvation Gas plus analyte
Sample Container
Mass Spectrometer
Carbomethoxypyridines
N
O
CH3
O
N
O
CH3
O
N
O
CH3
O
Mobility separation of isomers
Methyl Picolinate 1/200 dilution 138 MS/MS transfer, 2000WV
Scan10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
%
0
100
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
%
0
100
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
%
0
100
WAR112409_09_dt_01 Sm (SG, 2x3) TOF MSMS ES+ 137.6_138.5
1.70e4100
WAR112409_14_dt_01 Sm (SG, 2x3) TOF MSMS ES+ 137.9_138.2
2.21e499
WAR112409_11_dt_01 Sm (SG, 2x3) TOF MSMS ES+ 138_138.1
2.27e493
Para
Meta
Ortho
ATD for isomers
OrthoPara
Meta
Isobaric PEG systems
• Oligomers of di-hydroxyl end-capped PEG & PEG monooleate have same nominal mass-to-charge ratio – Different number of moles of ethylene oxide (EO)
• Resolution required to separate oligomers is ~6300
• Difference in m/z for two oligomers is 0.0880
– m/z 553.3411
– m/z 553.4292
12
O CH2CH2 OHH
6
CH3 (CH2)6 CH2 CH CH CH2 (CH2)5 CH2 C O CH2CH2 O H
O
Synapt G1 mobility separation – m/z 553
20 40 60 80 100 120 140
Scan
100 200 300 400 500m/z
100 200 300 400 500m/z
12
O CH2CH2 OHH6
CH3 (CH2)6 CH2 CH CH CH2 (CH2)5 CH2 C O CH2CH2 O H
O
[M+Li]+
[M+Li]+
Hilton G. R., et al,. Anal. Chem., 2008, 80 (24), 9720-9725
Synapt G1 mobility separation – m/z 861
50 60 70 80 90 100110120130140150Scan
100 200 300 400 500 600 700 800 900m/z 100 200 300 400 500 600 700 800 900m/z
19O CH2CH2 OHH
13CH3 (CH2)6 CH2 CH CH CH2 (CH2)5 CH2 C O CH2CH2 O H
O
[M+Li]+
[M+Li]+
Hilton G. R., et al,. Anal. Chem., 2008, 80 (24), 9720-9725
Synapt G2: Ion mobility separation – m/z 1126
Scan120 130 140 150 160 170 180 190 200
m/z200 400 600 800 1000
18O CH2CH2 OHH
25
m/z200 400 600 800 1000
12CH3 (CH2)6 CH2 CH CHCH2 (CH2)5 CH2 C O CH2CH2 O H
O
19
[M+Li]+[M+Li]+
Precursor ion resolution8434
Driftscope separation G2
PEG 1000
PEG mono oleate
Synthesis of Tween 20
[C2H4O]nO+
- H2O +
IsosorbideSorbitan
- H2O
Sorbitol
Structures of Tween formulations
Formulation Structure Indicated purity
Tween 20 Polyoxyethylene (20) sorbitan monolaurate
50%
Tween 40 Polyoxyethylene (20) sorbitan monopalmatate
90%
Tween 60 Polyoxyethylene (20) sorbitan monostearate
50%
Tween 80 Polyoxyethylene (20) sorbitan monooleate
70%
Structures of major products
Sorbitan polyethoxylate [SPE]Isosorbide polyethoxylate [SPE]
Polysorbate monoester [PME]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OCR
H2CH2COHO
W
X
Y
Z
O
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OH
H2CH2COHO
W
X
Y
Z
O
O
OCH2CH2
H2CH2CO
OH
HO
M
P
Tween 20 overall averaged spectrum
m/z200 400 600 800 1000 1200 1400
%
0
100617.4
595.4573.3
410.2
223.2
141.1
388.2
686.4
708.5
752.5
774.5
775.5819.5821.5
Major species Tween 20
Series 1
686.4 + n*22Li2 [2+]R = C11H23 [laurate]
686*2 = 13721372 – 14 [Li2] = 13581358 – 164 [sorbitan] = 11941194 – 182 [RCOOH – H2O] = 10121012/44 [CH2CH2O] = 23
W + X + Y + Z = 23
Polysorbate monoester [PME]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OCR
H2CH2COHO
W
X
Y
Z
O
Major species Tween 20
Series 2
573.3 + n*22Li2 [2+]
573*2 = 11461146 – 14 [Li2] = 11321132 – 164 [sorbitan] = 968968/44 [CH2CH2O] = 22
W + X + Y + Z = 22
Sorbitan polyethoxylate [SPE]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OH
H2CH2COHO
W
X
Y
Z
Major species Tween 20
Series 3
322 + n*22Li2 [2+]
322*2 = 644644 – 14 [Li2] = 630630 – 146 [isosorbide] = 484484/44 [CH2CH2O] = 11
P + M = 11
Isosorbide polyethoxylate [SPE]
O
O
OCH2CH2
H2CH2CO
OH
HO
M
P
Tween 20 mobility separationWAR112409_28A.raw : 1
Tween 20 mobility separation
WAR112409_28A.raw : 1
Tween 20 mobility separationWAR112409_28A.raw : 1
Tween 20 MALDI spectrum
Isosorbide polyethoxylate [SPE]Sorbitan polyethoxylate [SPE]
Polysorbate monoester [PME]
Folahan O Ayorinde et al Rapid Comm. Mass Spectrom, 14, 2116, (2000)
m/z400 600 800 1000 1200 1400
%
0
100692.5
670.4
595.4
537.4
485.3
410.2
736.5
758.5
759.0
781.0
803.0
875.6
921.6
Tween 40 overall averaged spectrum
Major series Tween 40
Series 1
670.4 + n*22Li2 [2+]R = C15H31 [palmitate]
670*2 = 13401340 – 14 [Li2] = 13261326 – 164 [sorbitan] = 11621162 – 238 [RCOOH – H2O] = 924924/44 [CH2CH2O] = 21
W + X + Y + Z = 21
Polysorbate monoester [PME]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OCR
H2CH2COHO
W
X
Y
Z
O
Major series Tween 40
Series 2
573.3 + n*22Li2 [2+]
573*2 = 11461146 – 14 [Li2] = 11321132 – 164 [sorbitan] = 968968/44 [CH2CH2O] = 22
W + X + Y + Z = 22
Sorbitan polyethoxylate [SPE]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OH
H2CH2COHO
W
X
Y
Z
Major series Tween 40
Series 3
322 + n*22Li2 [2+]
322*2 = 644644 – 14 [Li2] = 630630 – 146 [isosorbide] = 484484/44 [CH2CH2O] = 11
P + M = 11
Isosorbide polyethoxylate [SPE]
O
O
OCH2CH2
H2CH2CO
OH
HO
M
P
WAR112409_29.raw : 1
Tween 40 mobility separation
WAR112409_29.raw : 1
Tween 40 mobility separation
Tween 40 extracted regionsWAR112409_29.raw : 1
A
B
Tween 40 conformational families
m/z500 550 600 650 700 750 800
%
0
100
%
0
100692.5
670.4
669.9
714.5
758.5780.5
802.5 824.5
573.3551.3
529.3507.3
595.4
617.9
639.9
647.4
A
B
Polysorbate monoester [PME]
Sorbitan polyethoxylate [SPE]
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OCR
H2CH2COHO
W
X
Y
Z
O
O
OCH2CH2 OH
OCH2CH2
OCH2CH2 OH
OH
H2CH2COHO
W
X
Y
Z
Tween 40 extracted regions
WAR112409_29.raw : 1
a
b
c
m/z600 700 800 900 1000 1100 1200 1300
%
0
100
%
0
100
%
0
1001025.8981.7
893.7849.7
1069.8
1157.81201.9
831.6743.5
699.5
615.5
875.6
963.6 1007.71201.8
1051.6963.6919.5
901.5900.5
1095.61183.7
1271.71315.8
c
b
a
Tween 40 conformational families
Polysorbate monoester [PME]
Polyisosorbide monoester [PME]
Tween 40 MALDI spectrum
Isosorbide polyethoxylate [SPE]
Sorbitan polyethoxylate [SPE]
Polysorbate monoester [PME]
m/z400 600 800 1000 1200 1400
%
0
100595.4
451.1
443.3
428.6
692.5728.5
736.5
758.5
773.0
802.5817.0
Tween 60 overall averaged spectrum
WAR112409_30.raw : 1
Tween 60 mobility separation
Tween 60 MALDI spectrum
Isosorbide polyethoxylate [SPE]
Sorbitan polyethoxylate [SPE]
Polysorbate monoester [PME]
Tween 80 overall averaged spectrum
m/z400 500 600 700 800 900 1000 1100 1200 1300
%
0
100x2x2
525.1
575.4 771.5604.7619.7
815.5
860.1
925.6
Tween 80 mobility separationWAR112409_31.raw : 1
Tween 80 MALDI spectrum
Isosorbide polyethoxylate [SPE]
Sorbitan polyethoxylate [SPE]
Polysorbate monoester [PME]
Conclusions
• ESI mobility-separated spectra offer an excellent screening approach for complex polymer formulations
• A number of, previously unseen, conformational series may be observed and extracted
• Mobility-separated MS/MS data can provide more detailed structural information
• The ESI spectra show greater agreement with published compositions than those obtained using MALDI
BMSP research group