Effects of substrate surfaces in matrix‐assisted laser desorption/ionization mass spectrometry

Togashi, Hiroyuki; Kobayashi, Yoshinori

doi:10.1002/rcm.4210

Cited by 3 publications

(4 citation statements)

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“…[ 4 , 5 , 6 ] Key to the method are the matrices or engineered substrates that facilitate the generation of ionic species using energy from a laser. [ 7 , 8 ] The properties of the substrates, including their chemistry, conductivity, and micropatterning impact sample ionization efficiency and, thus, measurement sensitivity. [ 8 , 9 , 10 , 11 ] For example, micrometer‐scale wells are useful for segregating samples of distinct compositions so they can be separately analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…[ 7 , 8 ] The properties of the substrates, including their chemistry, conductivity, and micropatterning impact sample ionization efficiency and, thus, measurement sensitivity. [ 8 , 9 , 10 , 11 ] For example, micrometer‐scale wells are useful for segregating samples of distinct compositions so they can be separately analyzed. [ 12 , 13 , 14 ] Well arrays are also compatible with active [ 15 , 16 ] or passive loading techniques, [ 12 , 17 ] to simplify the preparation of samples for analysis.…”

Section: Introductionmentioning

confidence: 99%

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Microbowls with Controlled Concavity for Accurate Microscale Mass Spectrometry

et al. 2022

Advanced Materials

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The properties of the substrates, including their chemistry, conductivity, and micropatterning impact sample ionization efficiency and, thus, measurement sensitivity. [8][9][10][11] For example, micrometer-scale wells are useful for segregating samples of distinct compositions so they can be separately analyzed. [12][13][14] Well arrays are also compatible with active [15,16] or passive loading techniques, [12,17] to simplify the preparation of samples for analysis. However, MALDI-MS requires samples to be dried prior to analysis. When droplets are dried on flat surfaces, they tend to distribute their analytes about the perimeter due to the coffee ring effect. [18,19] Similar processes occur in cylindrical wells, leading to precipitation along the periphery [20,21] where the signal is inhibited due to laser occlusion by the walls. The result in both cases is lowered sensitivity and increased measurement variability due to inhomogeneity of the sample spots. [18,22] Bowl-shaped wells with curved bases are advantageous because, upon drying, precipitated analytes concentrate at the center in a more uniform fashion, [23] where they are efficiently ionized. [24] These wells, however, are difficult to fabricate, requiring micromachining, subtractive etching methods, embossing of plastics or specialized deposition methods. [23,[25][26][27][28] Additive fabrication approaches are superior because they use photolithographic techniques that are simple, inexpensive, and ubiquitous. However, photolithographic fabrication of wells with controlled curvature is challenging, requiring complex mask and lens systems to modulate light intensity with micrometer resolution across the array. [29,30] Consequently, simpler but inferior methods with stamping or backfilling of sharp features with polymer are more common, even though they are tedious and provide limited control. [6,[31][32][33] A superior approach would use simple photolithographic techniques without sacrificing control over well shape and curvature.In this paper, we describe a simple method to photolithographically fabricate wells with controlled curvature in SU8. This photoresist has several properties useful for mass spectrometry, including chemical robustness, precision control of surface features, and scalable fabrication. Using the approach, we fabricate curved-bottom wells at a density of 100 000 per square centimeter on a glass slide. To demonstrate the utility of these wells, we show they yield enhanced sensitivity in microscale mass spectrometry compared to cylindrical wells. Several approaches, such as the AnchorChip [34] and the μFocus plate, [35] use surface rather than physical modification to control drying and enhance MALDI MS, but do not Patterned surfaces can enhance the sensitivity of laser desorption ionization mass spectrometry by segregating and concentrating analytes, but their fabrication can be challenging. Here, a simple method to fabricate substrates patterned with micrometer-scale wells that yield more accurate and sensitive mass spectrometry mea...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbowls with Controlled Concavity for Accurate Microscale Mass Spectrometry

et al. 2022

Advanced Materials

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“…The ability to rapidly process multiple samples in parallel without auto-feeders makes it suited to high-throughput and single-cell applications [4][5][6] . Key to the method are the matrices or engineered substrates that facilitate the generation of ionic species using energy from a laser [7,8] . The properties of the substrates, including their chemistry, conductivity, and micropatterning impact sample ionization efficiency and, thus, measurement sensitivity [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

“…Key to the method are the matrices or engineered substrates that facilitate the generation of ionic species using energy from a laser [7,8] . The properties of the substrates, including their chemistry, conductivity, and micropatterning impact sample ionization efficiency and, thus, measurement sensitivity [8][9][10][11] . For example, micron-scale wells are useful for segregating samples of distinct composition so they can be separately analyzed [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Microbowls with controlled concavity for accurate microscale mass spectrometry

Abate

2021

Preprint

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Patterned surfaces can enhance the sensitivity of laser desorption ionization mass spectrometry by segregating and concentrating analytes, but their fabrication can be challenging. Here, we describe a simple method to fabricate substrates patterned with micron-scale wells that yield more accurate and sensitive mass spectrometry measurements compared to flat surfaces. The wells can also concentrate and localize cells and beads for cell-based assays.

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J. Mass Spectrom.

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Effects of substrate surfaces in matrix‐assisted laser desorption/ionization mass spectrometry

Cited by 3 publications

References 13 publications

Microbowls with Controlled Concavity for Accurate Microscale Mass Spectrometry

Microbowls with Controlled Concavity for Accurate Microscale Mass Spectrometry

Microbowls with controlled concavity for accurate microscale mass spectrometry

Current literature in mass spectrometry

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