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Products - Microarray Printing - Stealth Microarray Pin and Printhead Technology for Contact Printing-Based Microarray Manufacturing

microarray -printing-technology
Arrayit has set the standard for microarray manufacturing since 1997. ChipMaker, Stealth, 946, and Professional microarray pins and printheads are patent protected technologies (U.S. 6,101,946) that represent the most advanced and widely used microarray technology in the world with >3,000 installations. Users can choose among dozens of different spotting pin designs and sizes, and all ArrayIt® 946 and Stealth microarray printing pins and printheads are fully interchangeable for maximum flexibility. Shown here is a Stealth 48 printhead fitted with 48 SMP3 microarray spotting pins.

microarray pin collar
Click here for 946 style microarray spotting pins with extended collar design.

Why Stealth is such a highly advanced microarray spotting technology.
The patented Stealth contact printing technology from Arrayit uses short Pins and a single-guiding surface Printhead, for superior durability and precision.

Pins ride up and down in a 10 Ám “air bushing” in the Printhead guiding holes, providing near frictionless printing and millions of printing cycles without any detectable wear.  Pins and Printheads maintained properly will last for years, even with regular use.

Pins are available in a wide assortment of tip and channel sizes, allowing users to specify spot diameter and loading volume.

Microarray Spotting Pins and Printheads are manufacturing using the world’s most advanced micro-machining technology, ensuring tolerances in the range of ▒0.0001” (2.5 Ám)!

Stealth technology is compatible with any high quality motion control system, allowing users to equip their favorite robot with Stealth.  Stealth technology is used with robots made by 20 different companies, and our worldwide placements exceed 1,100. Because many of our customers run core facilities, the total number of individual laboratories using Stealth technology is estimated at >5,000.

All Pins are measured and adjusted digitally, providing perfectly matched Pin sets for uniform spot size from pin to pin.

The Stealth 48 Printhead holds 48 Pins for up to 10 times faster arraying than other contact and non-contact technologies.  Motion control systems equipped with a Stealth 48 Printhead and Pins will print 50 chips of 10,000 spots in 6 hours.

The Stealth Printhead allows manual Pin removal and replacement, without any special tools, disassembly, or expensive service calls.  A complete set of 48 Pins can be removed by hand in less than 5 minutes, providing a simple and reliable printing technology.

Stealth Pins are equipped with collars that ride freely in the Printhead guiding channels, exploiting gravity to return the Pins stationary position during each Printing cycle.  By exploiting gravity and avoiding spring loading, Stealth Pins are durable to millions of cycles.  The collars also prevent the pins from rotating during the printing process, increasing the printing accuracy.

Stealth Pins have 4.5 mm center-to-center spacing, allowing the flexibility of loading samples from 96-well (9 mm spacing) and 384-well (4.5 mm spacing) plates.  A Micro Spotting device for 1536-well plates (2.25 mm spacing) is under development.

One of the main advantages of microarray technology is the use of small sample volumes.  Stealth SMP3 Microarray Spotting Pins have an uptake volume of 0.25 Ál and a delivery volume of 600 pl, providing up to 400 spots per loading. Ten complete print runs can be accomplished using only 2.5 Ál of sample.  A single PCR reaction provides material sufficient to make >1,000 chips.

Other less advanced systems require 3-30 Ál of loading volumes.

Stealth Pins have very small sample volumes of 5 Ál per 384-well plate, conserving precious array samples.

ArrayIt Brand Stealth and 946 Microarray Spotting Technologies have become the standard in the industry for contact printing of cDNAs, proteins, antibodies, small molecules, PNAs, carbohydrates and many other target types. Our widely used platform makes it easy to collaborate and exchange data with researchers at universities,
companies and clinical laboratories worldwide. All Stealth and 946 Pins and Printheads are fully interchangeable for maximum affordability and user flexibility.

Arrayit microarrays
Figure 1. 82K Microarray. Shown is a DNA microarray containing 82,944 spots printed on a treat microscope slide (CEL distributed by Arrayit). The test spotting solution containing 1.0 pmole/Ál Cy3-labeled 21-mer oligonucleotide suspended inMicro Spotting Solution, was deposited as 0.4 nl droplets at 120 Ám center-to-center spacing with a PixSys 5500 gridding robot (Cartesian) equipped with a Stealth printhead (SPH32) and SMP3 Micro Spotting Pins (Arrayit). The 144 x 576 array (bottom) corresponds to a 18 mm x 72 mm area on the glass surface with enlargements of 3.6 mm x 7.2 mm (top left) and 1.9 mm x 3.6 mm (top right). Fluorescent scanning was accomplished with a ScanArray 3000 (GSI Lumonics) set at 100% PMT and 70% laser power in channel 1. The 16-bit tiff data are presented in a rainbow color palette.

Arrayit contact printing
Figure 2. Printing mechanism. Arrayit's unique printing technology (U.S. patent 6,101,946) enables high-speed manufacture of microarrays on glass, gels, membranes and other microarray surfaces. The pins have flat tips and defined uptake channels, which allows a thin (25 Ám) layer of sample to form at the end of the pin, and printing to proceed by gentle surface contact. Printing occurs as a simple 3-step "ink-stamping" process as follows: (left) downstroke, (center) contact, and (right) upstroke. Pin tips and channels are available in a wide assortment of dimensions, allowing users to specify spot diameter and the number of spots per loading.

Arrayit stealth pins
Figure 3. Stealth 3 Pins and Corresponding Microarrays. (Top panel) Shown is an SMP3 Pin with a regular uptake channel (top left), an SMP3B Pin with a "bubble" uptake channel (top center), and an SMP3XB Pin with an "extended bubble" channel (top right). The SMP3, SMP3B and SMP3XB pins load 0.25 Ál, 0.60 Ál and 1.25 Ál of sample, respectively, allowing users to specify loading volumes and the number of spots per loading. The space bar equals 200 Ám. (Bottom panel) Microarrays printed with an SMP3 pin (bottom left), an SMP3B pin (bottom center), and an SMP3XB pin (bottom right). The SMP3 pin produces 200 spots of 110 Ám diameter, the SMP3B pin produces 510 spots of 120 Ám diameter, and the SMP3XB pin produces 780 spots of 130 Ám diameter. The sample was a 500 fmole/Ál solution of Cy3-labeled oligonucleotide in 1X Micro Spotting Solution (MSS) printed on a SuperAldehyde Substrate (SMA) at 18░C, 50% relative humidity and 150 Ám spacing using a PixSys 5500 robot (Cartesian). Printed microarrays were scanned at 80% PMT and 90% laser power on a ScanArray Express (PerkinElmer) and the .tif data were coded to a rainbow palette. The space bar equals 450 Ám. A total of 42 interchangeable Stealth pins allow users to specify loading volume, spot diameter, and number of spots per loading (see Table 1). All pins are interchangeable and in the three Stealth Printheads (Table 2) and can be changed manually in a few minutes without any special tooling.

Click here for patent information!

Motion control parameters *

  • Non-surface contact: X, Y, Z motions
  • Surface contact: Z only!
  • Sample loading time: 2-3 sec
  • Pin wash time: 3 cycles at 1-3 sec/cycle
  • Z axis surface clearance: 1.0-1.5 mm
  • Z axis acceleration: 30 cm/sec2
  • Z axis velocity: 7.5-20 mm/sec (See Table 1)
  • Z axis travel (surface = 0): +0.5-1.0 mm
  • Surface dwell time: 0.05 sec
  • Cycle time (32 pins): 32 features/sec

*All motion control parameters are suggestions only. Each of these parameters should be empirically tested with a single spotting pin to test printing quality and pin durability. Parameters can be modified to maximize printing quality and speed in a manner compatible with your motion control system. Changes in Z axis surface clearance, acceleration, velocity and travel should be made with extreme care!

How to care for your Stealth Micro Spotting Device
The Stealth Microarray Spotting Device is designed and engineered for optimal wear and durability, while gaining the highest printing performance in the sub-nanoliter scale. The Pins and Printhead have been tested out to 1 million printing cycles with no loss of printing precision or performance. Maximum durability requires proper use. Improper use of these precision products can lead to loss of performance or permanent damage. To avoid damaging your Stealth Micro Spotting Device, please follow these guidelines:

1. The Printhead should be mounted on the motion control system prior to inserting the Pins into the Printhead. All hardware, motion control movements, calibration and software should be completely checked prior to inserting the Pins into the Printhead. Once the Pins are carefully inserted into the printhead, Pins can be damaged by inappropriate use. Pins must never be dropped, slammed or dragged across solid surfaces. Any contact of this nature outside the Z-axis will permanently damage the tips of the Micro Spotting Pins. Pay particular attention to the Z-axis speed settings and use the recommended setting in this protocol.

2. If a loss of printing quality is observed, the spotting pins can be cleaned by carefully by using the Pin and Printhead Cleaning Kit. Never subject Stealth parts to extremes in temperature or pH and avoid the use of strong solvents as these may damage the pin surface chemistry. Never dry Pins using canned air, the propellants ruin the surface tension properties needed for reliable printing. To clean Pins use the Pin and Printhead cleaning kit.

3. Microarray experiments depend upon the quality of the samples. Samples prepared by standard purification procedures can result in pin clogging and a loss of chip quality. For best results with PCR products use PCR products purified with one of the ArrayIt® PCR Purification Kits. Increased performance can also be obtained by using spotting buffers and surface chemistry specifically formulated for optimal results.

4. WARNING: Pressurized air canisters and other sources of pressurized air contain organic propellants that diminish the surface tension properties of pin tips and channels. Do not use pressurized air canisters to dry your pins but rather use the Microarray Air Jet for this purpose.

Notes on wash/dry stations of microarrayers
The keys to a wash/dry station working properly are:
(1) A clean and continuous distilled water source that does not splash or aspirate
(2) Sufficient vacuum airflow to dry the printing mechanisms, and
(3) Proper motion control programming.

Wash water should be continually replenished during a print run to avoid build up of residual sample. A build up of sample could cause serious cross contamination of samples. A vacuum dry station does not rely on vacuum pressure to dry printing tips, it relies on a large amount of air passing over the tips to facilitate drying. Multiple wash/dry cycles are necessary to make sure that all residual samples are washed away. A common error in programming a wash/dry cycle is drying the tips of the printing mechanism too long after the first wash cycle. Only dry completely after the last wash cycle. If any residual sample is on the tip and it is dried there, it is much harder to wash away. The result is poor printing performance and/or cross contamination of sample.

microarray pin tips
Figure 4. Pin Tips. (Top left) Shown is an SMP-4 pin tip at 335 times magnification (335X) viewed bottom-up along the shaft dimension. The flatness of the tip, which provides the "ink stamp" printing mechanism, is readily observed and the space bar equals 25 microns. (Top right) Surface topology plot of an SMP4 pin tip with data coded to a color palette. Pin tips are flat to about ▒2 microns (Ám), which allows sample to form at the end of the tip. (Bottom left) Fluorescent samples printed at 100 Ám center-to-center spacing with SMP2.5 pins, producing 75 Ám spot diameters, 8,100 spots/cm2, and 145,800 spots on a standard 25 mm x 76 mm glass substrate.

capillary pin
Figure 5. Dumont tweezer versus Arrayit Micro Spotting pin.(Left) Tweezers, split pins, and other printing devices that have undefined channels and uneven tips hold sample inside the channel and require a tapping force to break the meniscus and expel the sample onto the printing surface. The requirement of a tapping force greatly diminishes durability. (Right) Arrayit Micro Spotting Pins, by contrast, have defined sample channels and flat tips, which allow sample to form on the end of the tip. Arrayit pins do not require a tapping force to expel the sample, but rather work by a "ink stamping" mechanism. Light contact between the sample or the pin and the printing surface produces highly efficient printing, and durability out to millions of printing cycles. Arrayit pins also print horizontally (inset) and upside down, for greater flexibility in prototyping and research. Arrayit's unique design is covered by United States patent 6,101,946. Please do not infringe our patent.

microarray dispensing
Figure 6. SMP15XB Pin Printing.  A 500 fmole/Ál solution of Cy3-labeled oligonucleotide in 1X Micro Spotting Solution (MSS) was printed onto a SuperAldehyde Substrate (SMA) at 16░C and 45% relative humidity using a PixSys 5500 robot (Cartesian).  Spot spacing was 750 Ám.  The printed microarray was scanned at 80% PMT and 90% laser power on a ScanArray Express (PerkinElmer) and the .tif data were coded to a rainbow palette. The space bar equals 750 Ám. SMP15XB pins load 1.25 Ál of sample and print 88 spots of 590 Ám diameter under these conditions, and are excellent for diagnostic applications.

microarray holder
Figure 7. Stealth Printheads. (Left) Stealth 32 Pin Printhead (SPH32) shown as a front view.  All 42 Stealth Pins (see Table 1) fit interchangeably in the Stealth Printheads. (Right)  Stealth 48 Pin Printhead (SPH48) shown as a rear view.  All 42 Stealth Pins (see Table 1) fit interchangeably in the Stealth Printheads. The two mounting screw ports allow easy attachment of Stealth Printheads to any high quality motion control system.

microarray solid pin
Figure 8. SNS6 Pin Photos. Shown is a Stealth "No Sample Channel" (SNS) Pin with a 0.006" (150 Ám) wide tip used for applications requiring solid pins of exacting dimensions. The solid point of the SNS6 Pin is shown as a side view (left) and the tip is shown from the bottom up (right). The space bars denote 150 Ám.

Pin and Printhead Cleaning Kits contain all the equipment, tools and reagents for proper cleaning and maintenance of Stealth™ and ChipMaker™  Pins and Printheads. Click here or the photo for more information.
microarray pin cleaning

microarray solid pins
Figure 9. Calibration Pin for Stealth Micro Spotting Device (catalog ID SMPC). This pin doubles as a solid pin for printing large spots, but is best used for calibrating microarrayers. The end of the pin being the same size as the shaft makes it much easier to visualize if the end of the pin is touching off and moving around correctly in and out of microtiter plates, slides/substrates, sonicators and wash stations.

microarray test pin
Figure 10. Affordable solid pin compatible with all Stealth and 946  Printheads. Pins are the same length (1 1/16" or 26.99 mm) and have the same shaft diameter as all Stealth and 946 style pins.  Pin mass is 0.4 grams and the material is stainless steel. Tip  diameter is 0.015" (375 Ám) and provides "break away" flexibility for  use in testing and calibration microarrayers. These pins can also be use for low to medium density solid pin printing. Catalog  number for this product is SSP015.

Ordering Information
Table 1. Stealth Pins

Catalog ID

Spot diameter (Ám)

Uptake volume (Ál)

Delivery volume (nl)

Number of spots per loading

Minimum spot spacing (Ám)

Maximum subgrid per pin (spots)

Density (spots/ cm2) per 4 pins

Maximum number of spots (18 x 72 mm) per 64 pins

Price (US dollars)*

SMP2

62.5

0.25

0.5

235

90

50 x 50

10,000

160,000

$576

SMP2B

70

0.60

0.7

600

100

45 x 45

8,100

129,600

$646

SMP2XB

80

1.25

1.0

915

110

40 x 40

6,400

102,400

$680

SNS2

Identical to SMP2, but no sample channel (solid pin)

$576

SMP2.5

85

0.25

0.6

215

100

45 x 45

8,100

129,600

$553

SMP2.5B

90

0.60

0.8

550

110

40 x 40

6,400

102,400

$611

SMP2.5XB

110

1.25

1.1

845

130

34 x 34

4,624

73,984

$646

SNS2.5

Identical to SMP2.5, but no sample channel (solid pin)

$553

SMP3

100

0.25

0.7

200

120

36 x 36

5,184

82,944

$484

SMP3B

110

0.60

0.9

510

135

32 x 32

4,096

65,536

$553

SMP3XB

125

1.25

1.2

780

150

30 x 30

3,600

57,600

$576

SNS3

Identical to SMP3, but no sample channel (solid pin)

$484

SMP4

135

0.25

1.1

185

160

28 x 28

3,136

50,176

$426

SMP4B

145

0.60

1.4

470

175

25 x 25

2,500

40,000

$484

SMP4XB

160

1.25

1.8

720

190

23 x 23

2,116

33,856

$518

SNS4

Identical to SMP4, but no sample channel (solid pin)

$426

SMP5

165

0.25

1.5

170

200

22 x 22

1,936

30,967

$426

SMP5B

185

0.60

2.0

435

215

20 x 20

1,600

25,600

$484

SMP5XB

200

1.25

2.6

665

240

18 x 18

1,296

20,736

$518

SNS5

Identical to SMP5, but no sample channel (solid pin)

$426

SMP6

200

0.25

1.8

155

240

18 x 18

1,296

20,736

$426

SMP6B

220

0.60

2.4

400

255

17 x 17

1,156

18,496

$484

SMP6XB

240

1.25

3.2

610

290

15 x 15

900

14,400

$518

SNS6

Identical to SMP6, but no sample channel (solid pin)

$426

SMP7

235

0.25

2.3

140

260

17 x 17

1,156

18,496

$426

SMP7B

255

0.60

3.1

360

280

16 x 16

1,024

16,384

$484

SMP7XB

280

1.25

4.1

550

340

13 x 13

676

10,816

$518

SNS7

Identical to SMP7, but no sample channel (solid pin)

$426

SMP8

265

0.25

2.8

125

320

14 x 14

784

12,544

$426

SMP8B

295

0.60

3.7

320

350

12 x 12

576

9,216

$484

SMP8XB

320

1.25

4.9

490

380

11 x 11

484

7,744

$518

SNS8

Identical to SMP8, but no sample channel (solid pin)

$426

SMP9

300

0.25

3.3

110

360

12 x 12

576

9,216

$426

SMP9B

330

0.60

4.4

285

400

11 x 11

484

7,744

$484

SMP9XB

360

1.25

5.9

435

430

10 x 10

400

6,400

$518

SNS9

Identical to SMP9, but no sample channel (solid pin)

$426

SMP10

335

0.25

3.9

100

400

11 x 11

484

7,744

$426

SMP10B

365

0.60

5.2

250

440

10 x 10

400

6,400

$484

SMP10XB

400

1.25

6.9

380

480

9 x 9

324

5,184

$518

SNS10

Identical to SMP10, but no sample channel (solid pin)

$426

SMP11

365

0.25

4.4

80

440

10 x 10

400

6,400

$426

SMP11B

400

0.60

5.9

210

480

9 x 9

324

5,184

$484

SMP11XB

440

1.25

7.9

320

530

8 x 8

256

4,096

$518

SNS11

Identical to SMP11, but no sample channel (solid pin)

$426

SMP12

400

0.25

5.1

70

480

9 x 9

324

5,184

$426

SMP12B

440

0.60

6.8

170

530

8 x 8

256

4,096

$484

SMP12XB

480

1.25

9.1

260

580

7 x 7

196

3,136

$518

SNS12

Identical to SMP12, but no sample channel (solid pin)

$426

SMP13

435

0.25

5.8

55

520

8 x 8

256

4,096

$426

SMP13B

475

0.60

7.7

135

570

7 x 7

196

3,136

$484

SMP13XB

520

1.25

10.3

205

624

7 x 7

196

3,136

$518

SNS13

Identical to SMP13, but no sample channel (solid pin)

$426

SMP14

465

0.25

6.5

40

560

8 x 8

256

4,096

$426

SMP14B

510

0.60

8.7

100

610

7 x 7

196

3,136

$484

SMP14XB

560

1.25

11.6

150

670

6 x 6

144

2,304

$518

SNS14

Identical to SMP14, but no sample channel (solid pin)

$426

SMP15

500

0.25

7.0

25

600

7 x 7

196

3,136

$426

SMP15B

550

0.60

9.4

60

660

6 x 6

144

2,304

$484

SMP15XB

600

1.25

12.5

90

720

6 x 6

144

2,304

$518

CSP

Custom Stealth style microarray pin designed to customer specifications.

$576

SNS15

Identical to SMP15, but no sample channel (solid pin).

$426

SSP015

Affordable solid pin for microarrayer testing and calibration, and solid pin printing. Compatible with all Stealt, 946 and professional series printheads.

$68

SMPC

Stealth calibration pin for microarrayer calibration and for printing 500-750 Ám diameter microarray spots with 250 nl spot volumes.

$319

Nominal Stealth Pin dimensions are as follows: length = 1 1/16 inches (26.99 mm), diameter = 1/16 inches (1.59 mm), and weight = 0.6 grams. Stealth Pins are named using a prefix, number and suffix (if any) as follows: SMP3XB, SMP (Stealth Micro Spotting Pin); 3 = Pin tip width of 3 thousands of an inch (0.003”) which equals 75 Ám; and XB (Extended Bubble) channel with a 1.25 Ál uptake volume. An SMP15 pin is a Stealth Pin with a 0.015” (375 Ám) wide tip and a standard 0.2 Ál uptake channel.  All 42 Stealth Pins use the same nomenclature and all are compatible with the three Stealth Printheads (see Table 2).  Values are averages obtained using 500 fmol/Ál Cy3-labeled oligonucleotide in 1X MSS printing solution on SuperAldehyde Substrates at 16░C and 50% relative humidity.  Values can vary depending on the printing solution, substrate, temperature, humidity, motion control system, Z axis approach velocity, printing parameters, sample viscosity, and other variables. All pins have been durability tested beyond 1,000,000 printing cycles with no detectable mechanical changes to the tip, uptake channel, pin shaft, or collar.  SMP2 and SMP2.5 series pins (blue shading) produce spots ranging from 62.5-110 Ám, and the small spot diameter and small tip dimensions of these pins are best used in conjunction with slightly slower Z axis approach velocities than the other Stealth pins. A maximum Z-axis velocity of 7.5 mm/sec is recommended for SMP2, SMP2B and SMP2XB pins and a maximum Z-axis velocity of 10 mm/sec is recommended for SMP2.5, SMP2.5B and SMP2.5XB pins.

Table 2. Stealth Printheads

Catalog ID

Max. number of Stealth pins

Center to center pin spacing (mm)

Maximum  pin footprint (mm)

Number of printing cycles per 384-well microplate

Printhead dimensions (inches, L x W x H)

Mounting screw center to  center spacing (inches)

Time to print 10,000 spots onto 50 substrates (hours)

Price (US dollars)*

SPH4

4

4.5

9 x 9

96

0.5 x 0.7 x 0.5

Single hole in center of printhead

80.2

$745

SPH32

32

4.5

18 x 36

12

2.5 x 1.25 x 0.5

2.125

10.4

$1,640

SPH48

48

4.5

18 x 54

8

3.5 x 1.25 x 0.5

2.875

6.9

$2,022

SPH64

64

4.5

18 x 72

6

4 x 1.25 x 0.5

3.075

5.2

$2,402

To
order ArrayIt® Brand Products call 408-744-1331, fax 408-744-1711, email arrayit@arrayit.com, or click on the purchase buttons above to proceed directly to the purchase page.

*International pricing may vary as much as 30% (or more depending on country) due to import duties, stocking fees and technical support.

*Add shipping and handling to all orders.

Licensing
Arrayit microarray printing technology (U.S. 6,101,946) is sold license-free for research use only. All other uses of our patented technology including commercial testing and diagnostics require a license. For license inquiries, please contact our Licensing Department at arrayit@arrayit.com.

 

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