Options for Fast, Reliable Pesticide Residues Analysis in...
Transcript of Options for Fast, Reliable Pesticide Residues Analysis in...
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Options for Fast, Reliable Pesticide Residues Analysis in Food by Triple Quadrupole GC-MS/MS
Richard Fussell1
Vertical Marketing Manager, Food and Beverage Michael T. Hetmanski2, Cristian Cojocariu3, Victoria Bailey-Horne2, Dominic Roberts3 and Paul Silcock3 1Thermo Fisher Scientific, Hemel Hempstead, UK, 2 Food and Environment Research Agency (FERA), York, UK , 3Thermo Fisher Scientific, Runcorn, UK
PP71668-EN 0515S
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Outline
• The analytical challenge
• User requirements for GC-MS/MS analysis of pesticides • Collaboration between Fera and Thermo Fisher Scientific;
method optimisation, results and learning experiences
• Latest GC-MS/MS developments • Summary
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• Wide range of matrices • Food • Environment
• Wide analytical scope • Low limits of detection • High sample throughput • Fast turnaround • Low cost of analysis
Analytical Challenges
RT: 4.57 - 37.12
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NL:3.94E8TIC MS 2july2104_011
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Requirements for GC-MS/MS
• Selectivity
• High sensitivity for 2nd transition to enable identification of pesticides at low target concentrations
• Robustness in operation 24/7 and ease of use
• Reproducibility
• Software: Effective and ease of use
• Cost, maintenance and service
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1. Sample Prep: March 24th 2. LC-MS Analysis: April 29th
3. GC-MS Analysis: June 17th 4. Data Processing/Analysis: July 15th
Typical Pesticides Workflow Register at www.chromatographyonline.com/LCGCwebseminars
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Pesticide Analysis: Triple Quad GC-MS
Highly Selective Reaction Monitoring (SRM) Improved detection limits
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Selectivity: SIM and SRM
DDE-p,p’, 0.05 mg/kg in green tea, 1.0 uL splitless injection
Ion ratio = 2.7 Ion ratio = 3.5
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Thermo Fisher Scientific and Fera GC-MS/MS Collaboration (1)
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Analysis of QuEChERS Acetonitrile by GC?
• High expansion coefficient-limited injection volume
• Offline solvent exchange - requires care to avoid losses of volatile or unstable pesticides
• LVI with higher capacity liners or liner packing materials, but potential for adsorption of pesticides?
• Will repeated injection of acetonitrile extracts lead to a decrease in column efficiency?
• How quickly will matrix extracts contaminate the GC-MS
system?
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Evaluation of high sensitivity GC-MS/MS
• Thermo Scientific™ TSQ Quantum™ GC-MS/MS system
• Thermo Scientific™ Trace™ Ultra GC Chromatograph • Thermo Scientific™ TriPlus RSH ™ Autosampler • Column: TR-Pesticide (II), 30 m x 0.25 mm i.d., 0.25 µm film
• ‘test matrix’- fruit preserve
• 96 pesticides/metabolites:192 transitions
Evaluate direct analysis, of QuEChERS acetonitrile extracts
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SRM chromatograms – 1µL splitless
Splitless injection (1 µL) of acetonitrile extracts (d-PSA clean-up) of fruit preserve spiked at 0.01 mg/kg (= 10 pg on-column)
184.95>92.88 219.95>1
Dichlorvos
6.44
Pirimiphos- methyl
290.09>233.07 305.10>290.09
21.05
148.97>69.98 148.97>104.98
Captan (0.02 mg/kg)
24.9
226.03>206.03 163.02>206.03
Cyfluthrin (0.02 mg/kg)
47.03
180.99>151.99 252.99>93.00
Deltamethrin 51.6
Courtesy of Fera, UK
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Summary of validation data (1 µL splitless)
• QuEChERS extraction (citrate buffer/d-PSA) of fruit preserve
• Except chlorothalonil, recovery and % RSD data for the other 95 compounds met EU DG SANCO validation criteria
Results courtesy of Fera, UK
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Robustness (1 year) of instrument performance
• TSQ Quantum XLS • Analysed ~ 200 batches of samples
• ~ 6000 matrix injections (PTV-backflush)
• Kidney, liver, fish, meat, crustaceans, milk
• Response does vary but is always sufficient
• Analytical capillary column not replaced
• 2 breakdowns requiring service engineer
Information courtesy of Fera, UK
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Themo Fisher Scientific and Fera GC-MS/MS Collaboration (2)
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Thermo Scientific TSQ 8000 GC-MS/MS
The new Trace 1300 Series offers the most versatile GC platform in the market, with unique “instant connect” modularity for ground-breaking ease of use and performance, setting a new era in GC technology
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(No I/S)
Repeatability using the baffled liner
• [10ul (1/10 diln with EtAc] speed controlled solvent vent] • PTV Baffle Liner deactivated (Siltek),
Results courtesy of Fera, UK
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Repeatability Using Asymmetric Liners
• QuEChERS extracts of baby food (no IS) • High number of injector parameters to optimise
Results courtesy of Fera, UK
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Validation Results
Dichlorvos (m/z 185-93, 186.9-93)
Cyfluthrin (m/z 226.0-206.1, 163.0-127)
• Excellent results obtained • Cycle time approximately 40 minutes
(0.01 mg/kg, 10 pg on column) (0.001 mg/kg 2.5 pg on column)
Results courtesy of Fera, UK
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QuEChERS- GC-MS/MS Workflow Validation
Matrix Recovery (%) %RSD Average No out-with
criteria Average No outwith
criteria Apple 95 3 4.7 0 Grapes 100 4 4.1 2 lettuce 104 10 4,0 0 Oats 96 16 5.9 0
• According to SANCO/12571/2013 criteria • Recovery 70-120 % , RSDr (<20%)
• Splitless (1 µL) with cyclo-liner
Preliminary Data
Results courtesy of Fera, UK
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Thermo Scientific™ TSQ ™ 8000 Evo GC-MS/MS
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Increasing Laboratory Productivity
• Decrease analysis time by shortening the GC run times. • More samples in less time.
• Increase the number of pesticides in a run. • More SRMs to accommodate within an analytical run.
• Improve selectivity for various matrices.
• Increased number of SRMs per compound.
• See beyond the targets. • Full Scan and SRM data acquisition in the same experiment.
Expect More Performance
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Fast GC-MS Pesticide Residue Analysis
Challenges:
• Complexity of elution when using fast GC
• Large number of compounds (SRMs) in short time
• Many SRM transitions can result in sensitivity loss
Solution:
• High speed analyzer • Fast collision cell • Short SRM dwell times with very
short inter-scan delays
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TSQ 8000 Evo GC-MS/MS
Expect More Capacity
• Analytical instrumentation:
TSQ 8000 Evo GC-MS/MS Pesticide Analyzer TRACE 1310 GC Gas Chromatograph TriPlus RSH Autosampler (liquid injection set-up)
• EvoCell
• Rapid, innovative collision cell technology • Increased method capacity • More compounds • More SRM transitions • Up to 4x more transitions whilst maintaining method sensitivity low analyte concentrations
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Pesticide MRM Database
The problem:
• Growing list of target compounds require continuous adjustment to an existing SRM database.
• Some SRM transitions are not suitable for all matrices. Addition of new SRM transitions can be time consuming.
The solution:
• Automated SRM development with AutoSRM.
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AutoSRM: Fast, Simple Route to Optimized SRM
1) Precursor ion selection
2) Product ion selection
3) Collision energy optimization
AutoSRM automates the development of SRM methodology
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Highlights of AutoSRM
• Automates the following: • Creation of full scan, product ion scan, and SRM methods • Creation of sample sequences • Creation of data layouts for analyzing results • Selection of precursor, product, and collision energies
End result showing optimized transition
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Timed-SRM: Using Dwell Times Efficiently
Classical segmented SRM
TSQ 8000 EVO timed SRM
Classical segmented SRM:
• Complex to set up • Wasted dwell time • Reduced sensitivity • Reduced tolerance to RT shifts
TSQ 8000 Evo timed-SRM:
• Automated set-up • Full optimized dwell time • Optimal sensitivity • Increased resistance to RT shifts
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Increasing Laboratory Productivity
• Decrease the analysis time by shortening the GC run times. • More samples in less time. • More SRMIncrease the number of pesticides in a run. • s to accommodate within an analytical run.
• Improved selectivity for various matrices
• Increase the number of SRMs per compound.
• Seeing beyond the targets • Full Scan and SRM data acquisition in the same experiment.
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Decrease the Analysis Time
RT: 4.57 - 37.12
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NL:3.94E8TIC MS 2july2104_011
Full scan 144 pesticides in baby food @ 0.2 mg/kg TG-5 SILMS, 30m x 0.25 mm x 0.25 µm GC run time: ~37 min
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Fast GC: 144 Pesticides in Baby Food
As more compounds are added to a single run, more complexity arises with the management of acquisition windows and compound co-elution. RT: 3.68 - 10.75
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4.46 10.574.44 5.113.74 3.99
NL:1.28E9TIC MS 2july2104_057_140704112840SRM acquisition of 144 pesticides in baby food @ 0.2 mg/kg
GC column: TG-5 SILMS, 20m x 0.18 mm x 0.18 µm, faster temperature ramp GC run time: <11 min
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Increase Laboratory Productivity
• Decrease the analysis time by shortening the GC run times. • More samples in less time.
• Increase the number of pesticides in a run. • More SRMs to accommodate within an analytical run.
• Improved selectivity for various matrices
• Increase the number of SRMs per compound.
• Seeing beyond the targets • Full Scan and SRM data acquisition in the same experiment.
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More SRM Transitions/Compound for More Confidence
Tecnazene in baby food at 0.01 mg/kg level
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RT: 14.95 - 16.71
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RT: 15.79AA: 1901556SN: INF
NL: 2.60E6TIC F: + c EI SRM ms2 [email protected] [176.095-176.105] MS Genesis 19May2014_03
NL: 1.21E6TIC F: + c EI SRM ms2 [email protected] [245.995-246.005] MS Genesis 19May2014_03
RT: 14.84 - 16.62
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RT: 15.79AA: 1690756
NL: 2.35E6TIC F: + c EI SRM ms2 [email protected] [176.095-176.105] MS Genesis 19May2014_05
NL: 1.03E6TIC F: + c EI SRM ms2 [email protected] [245.995-246.005] MS Genesis 19May2014_05
More Speed Maintaining the Sensitivity
DDE-p,p’ in green tea, 1917 SRMs Inj. 0.01 mg/kg on column
DDE-p,p’ in green tea, 44 SRMs Inj. 0.01 mg/kg on column
0.7 ms 27 ms
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Linearity: Dichlorvos
• Dichlorvos peak area response over 0.5–10 ppb (mg/kg), matrix-matched standard (baby food).
• Chromatograms (quantification and confirmation ions) at 10 ppb level.
8 SRMs/compound
2 SRMs/compound R2= 0.998
R2= 0.997
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Examples of Peak Area Repeatability: Fast GC method
Data analysis method maintenance
GC Performance Maintenance
MS Performance Maintenance
Acquisition Method Maintenance
Routine results
%RSD pesticides (0.001 mg/kg on column) baby food matrix ~144 compounds in <10 minutes
Compound % RSD (n = 10) BHC, Alpha 7.0 BHC, Beta 8.8 BHC, gamma 9.2 Chlorobenzilate 12.5 Chlorothalonil 12.6 Clomazone 6.3 Cyfluthrin peaks 1-4 9.3 DDE p, p 8.2 Dichlobenil 5.3 Dichlorvos 8.1 EPTC 5.3 Etridiazole (Terrazole) 4.6 Hexachlorobenzene 8.9 Methacrifos 7.6 Propachlor 11.0 Propham 11.5 Simazine 9.1 Tecnazene 5.6 Tefluthrin 7.0 Triallate 11.0
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Comprehensive Detection of Pesticides in a Sample
• Targeted screening and quantification of a number of pesticides is important.
• Increased interest in screening the samples for additional compounds beyond a target list.
• Less common or new pesticides or unknown
metabolic/transformation products could be detected in addition to targeted compounds.
• This requires fast analytical instrumentation able to acquire both full scan and SRM/SIM data simultaneously.
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Summing up
• Compound database management: • Auto-SRM automates SRM transitions development.
• Using the available dwell time wisely: • Timed-SRM ensures minimal loss of time spent to acquire data.
• Enhancing the number of compounds and increasing the number of SRM transitions per compound:
• EvoCell fast collision cell technology.
• Comprehensive detection of target pesticides and of additional contaminants potentially hazardous to human health:
• Simultaneous full scan and SRM/SIM data acquisition.
• A full validation of this fast method is ongoing and will be available soon.
Fast, easy, and robust pesticide analysis can be achieved using:
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Thermo Scientific Food and Beverage Community
• View application notes, on-demand webinars, product information, and many more resources on our Pesticides and Food Communities Libraries:
www.thermoscientific.com/pesticides www.thermoscientific.com/foodandbeverage
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Thank You for Listening
Questions?
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