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Set Your Sights on Superior Performance

Restek PAL SPME Arrow

  • Rugged stainless steel construction ensures longer lifetimes.
  • Faster extraction means higher sample throughput.
  • Better sensitivity allows lower LODs.
  • Choose format based on sampling technique:
    • 1.1 mm sleeve, if only using headspace sampling.
    • 1.5 mm wide sleeve, if using direct immersion sampling (works for headspace, too).
 

Solid phase microextraction (SPME) is a fast, automated sample preparation technology that reduces sample handling, extraction time, and solvent consumption, making it a popular choice in environmental, food, and clinical laboratories. However, traditional SPME fiber technology has some significant drawbacks, including poor mechanical stability and a small phase volume.

The Restek PAL SPME Arrow system (patent pending) is a revolutionary change in microextraction that combines exceptional robustness with faster extraction times and trace-level sensitivity (Table I). In contrast to traditional SPME fibers, SPME Arrows contain significantly more phase volume, which allows more target analyte to be extracted in less time. In addition, the stainless steel construction, unique Arrow tip, inner stabilizing rod, and outer sheath design fully protect the phase, minimizing both mechanical damage and analyte loss during sample transfer.

Table I: Comparing Restek PAL SPME Arrow to Traditional SPME Fiber (Headspace Technique)

 

Traditional Fibers

1.1 mm Arrow

1.5 mm Arrow

The Arrow Advantage

Rugged stainless steel construction

  • Protective sheath
  • Stabilizing inner rod
  • Arrow-shaped tip

No

Yes

Yes

 

  • Longer lifetimes: Arrow construction protects the phase and minimizes both damage and analyte loss.
  • Less downtime due to breakage.
  • Eliminate septa coring.

 

Surface area

9.4 mm2

44 mm2

63 mm2

Increase sample throughput—higher surface area lets you reduce extraction time and analyze more samples per shift.

Phase (PDMS) volume

0.6 μL

3.8 μL

12 μL

With significantly more phase, SPME Arrow provides better sensitivity so you can lower detection limits with confidence.

 

On Target: Longer Lifetime

One of the main drawbacks to SPME fibers is their fragility. Even during routine use, they are easily damaged and can be irreparably broken (Figure 1). Busy labs will benefit greatly from the reliability of rugged Restek PAL SPME Arrow. The unique stainless steel Arrow design includes a robust inner stabilizing rod that resists bending and breakage, as well as an outer sheath that protects the phase coating and prevents both physical damage and analyte loss. Typically, SPME Arrows perform well for hundreds of extractions, lasting 2–3 times longer than traditional SPME fibers. In addition, the unique arrow-shaped tip pierces the septum cleanly and with little resistance, extending septum lifetime (Figure 2).

Figure 1: SPME fibers break easily during routine operation.

Figure 2: The rugged construction of the Restek PAL SPME Arrow prevents breakage under normal use.

Which Restek PAL SPME Arrow is best for my application?

Restek PAL SPME Arrows are suitable for a wide range of analyte chemistries and sample matrices. They are suitable for manual injection and compatible with PAL3 autosamplers. Choose the best SPME Arrow for your application based on the properties of your target compounds. Note that a GC inlet conversion kit is required in order to use a Restek PAL SPME Arrow.

  • Trace analysis in foodstuffs
  • Drugs and pharmaceuticals
  • Herbicides/pesticides
  • Medical diagnostics
  • Trace impurities in polymers and solid samples
  • Solvent residues in raw materials
  • Water analysis (organics in water)
 

Description

Material

Hub Color

Thickness (μm)

Needle Diameter (mm)

Recommended Analytes

qty.

cat.#

SPME Arrow

Polydimethylsiloxane (PDMS)

Red

100 μm

1.1 mm

Volatile, 60–275 g/mol*

ea.

27485

SPME Arrow

Polydimethylsiloxane (PDMS)

Red

100 μm

1.5 mm

Volatile, 60–275 g/mol*

ea.

27877

SPME Arrow

Polydimethylsiloxane (PDMS)

Black

250 μm

1.5 mm

Volatile, 60–275 g/mol
(high capacity)*

ea.

27484

SPME Arrow

Polyacrylate

Gray

100 μm

1.1 mm

Polar, semivolatile,
80–300 g/mol*

ea.

27488

SPME Arrow

Carbon Wide Range (WR)/PDMS

Light Blue

120 μm

1.1 mm

Highly volatile,
30–225 g/mol*

ea.

27487

SPME Arrow

Carbon Wide Range (WR)/PDMS

Light Blue

120 μm

1.5 mm

Highly volatile,
30–225 g/mol*

ea.

27879

SPME Arrow

Divinylbenzene (DVB)/PDMS

Violet

120 μm

1.1 mm

Amines and polar compounds, 60–300 g/mol*

ea.

27486

SPME Arrow

Divinylbenzene (DVB)/PDMS

Violet

120 μm

1.5 mm

Aromatic semivolatile, 60–300 g/mol*

ea.

27878

SPME Arrow

DVB/Carbon WR/PDMS

Dark Gray

120 μm

1.1 mm

Volatile and semivolatile, 40–275 g/mol*

ea.

27875

SPME Arrow

DVB/Carbon WR/PDMS

Dark Gray

120 μm

1.5 mm

Volatile and semivolatile, 40–275 g/mol*

ea.

27876

SPME Arrow Method Development Kit

Set of 5

27489

*These molecular weight ranges are a reasonable approximation; however, end users should verify suitability for their specific application.

All Restek PAL SPME Arrows have 20 mm of phase bonded onto stainless steel.
 

On Target: Higher Sample Throughput

Restek PAL SPME Arrows provide much faster extraction times than traditional SPME fibers because Arrows have much more phase volume. As shown in Figure 3, the increased phase volume allows more target analyte to be extracted in just seconds using an Arrow than can be extracted from a traditional fiber. Being able to extract what you need in a fraction of the time means more samples can be analyzed per day, which improves lab efficiency and profitability. The example in Table II demonstrates a nearly 50% increase in productivity!

Figure 3: Benchmark Comparison of 1.1 mm SPME Arrow vs. Standard SPME Fiber for 2.5 ppb Volatiles in Headspace.

Table II: Analyze more samples per day with Restek PAL SPME Arrow.

  Sample Collection and Desorption Steps with Associated Times (sec)

Target Analytes

Select Sample Vial

Vial Incubation / Fiber Conditioning

Vial Transfer

Sample Extraction (Headspace)

GC Equilibration

Desorb Fiber

Return Sample Vial

Total Time

Samples per Day

Traditional SPME Fiber

22

120

20

120

15

10

15

322

268

SPME Arrow

22

120

20

15

15

10

15

217

398 (~50% increase)

Note: Processes that take <10 sec to perform were omitted from the table. Actual samples per day is dependent on GC cycle time.

 

On Target: Lower Detection Limits

Developing a new method or trying to improve the performance of an existing one? Restek PAL SPME Arrows have more phase volume, so they provide much greater sensitivity than traditional fibers. To demonstrate this, 82 volatile compounds were analyzed under three different headspace extraction time and extraction volume combinations. Results under all experimental conditions definitively show that Arrow outperforms traditional SPME fiber and provides much higher analyte responses (Table III and Figure 4).

Table III: Analyte response is much higher with SPME Arrow than with a traditional SPME fiber.

  Average % Increase in Response of Arrow vs.
Traditional Fiber

Extraction Time (min)

Extraction Volume (mL Water)

1.1 mm Arrow

1.5 mm Arrow

10

10

297%

527%

5

10

618%

896%

10

5

446%

634%

 

Figure 4: Restek PAL SPME Arrow extracts more target analyte from samples, allowing lower detection limits.

GC_EV1439
ColumnRtx-VMS, 30 m, 0.25 mm ID, 1.40 µm (cat.# 19915)
Standard/Sample2-Chloroethyl vinyl ether (cat.# 30265)
8260 MegaMix calibration mix (cat.# 30633)
8260 Surrogate mix (cat.# 30073)
VOA calibration mix #1 (ketones) (cat.# 30006)
California oxygenates mix (cat.# 30465)
502.2 Calibration mix #1 (gases) (cat.# 30042)
8260 Internal standard mix (cat.# 30074)
Diluent:Water
Conc.:50 ng/mL
Injectionsplit (split ratio 10:1)
Liner:Topaz 1.8 mm ID straight/SPME inlet liner (cat.# 23280)
Inj. Temp.:250 °C
Oven
Oven Temp.:40 °C (hold 1 min) to 100 °C at 12 °C/min (hold 0 min) to 240 °C at 25 °C/min (hold 1.6 min)
Carrier GasHe, constant flow
Flow Rate:1.0 mL/min
Linear Velocity:44.411 cm/sec @ 40 °C
DetectorMS
Mode:Scan
Scan Program:
GroupStart Time
(min)
Scan Range
(amu)
Scan Rate
(scans/sec)
1035-22612.1
Transfer Line Temp.:250 °C
Analyzer Type:Quadrupole
Source Type:Extractor
Extractor Lens:3 mm ID
Source Temp.:300 °C
Quad Temp.:150 °C
Electron Energy:70.0 eV
Tune Type:manual
Ionization Mode:EI
InstrumentAgilent 7890B GC & 5977A MSD
AcknowledgementCTC Analytics AG

Turning to the emerging cannabis market and the triple-phase (DVB/Carbon WR/PDMS) Arrow, you can also expect significantly higher analyte responses with residual solvents and other classes of compound (Figure 5).

Figure 5: Restek PAL SPME Arrow provides similarly superior results for residual solvents and other compounds.

Figure 6: Traditional SPME fibers cannot match the extraction yield of SPME Arrows (immersion extraction technique).

Our product line is continually expanding! See what’s new at www.restek.com/SPME

GNSS2642E-UNV

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