Mass spectrometry substrate as well as preparation method and application
A substrate and texture technology, applied in the field of mass spectrometry detection, can solve problems such as complexity, high baseline, and affecting hydrophobic properties
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Embodiment 1
[0065] Embodiment one, preparation substrate
[0066] (1) Substrate material selection
[0067] It is characterized by tough texture and good flatness; such as stainless steel, diamond, single crystal silicon, quartz crystal, etc.; it is divided into rectangles suitable for MALDI-TOF sample chamber specifications. In order to ensure the accuracy of quality inspection, the division accuracy is less than 10 μm.
[0068] (2) Silanization treatment
[0069] 1. Clean the substrate
[0070] Place the substrates in a beaker, spread out flat without overlapping, rinse the substrates with acetone, and transfer the cleaned substrates to a new beaker.
[0071] Add a certain amount of mixture of methanol and water into the beaker, and ultrasonicate for 30 minutes.
[0072] Transfer the substrate to a new beaker, add a certain amount of chloroform, and sonicate for 30 minutes.
[0073] Remove and dry the substrate.
[0074] 2. Clean the substrate with concentrated acid solution
[00...
Embodiment 2
[0103] Embodiment 2, sample crystallization observation and comparison of target plate
[0104] Take an appropriate amount of the prepared matrix solution and drop them on the two substrates J1 and J2 with contact angles of about 135° and 155°, and the two traditional target plates T1 and T2 respectively; On J1, J2, T1, and T2, after the samples were dried naturally, the crystal morphology was observed under a microscope, see Figure 4 .
[0105] Wherein, the traditional target plate is TO-488 gene detection target plate produced by SHIMADZU.
[0106] Such as Figure 4 As shown, the traditional biological detection target plate T1, T2 crystal form (see Figure 4 ) is irregular in shape, the lines are not smooth, it is in the state of a coffee ring, and the surface is uneven. Due to the hollow space and thick surrounding, when the laser bombards the sample, the sample peak accuracy is poor, the noise is high, and the baseline is high.
[0107] And biological detection subs...
Embodiment 3
[0108] Embodiment three, mass spectrometry detection effect comparison
[0109] Put the substrate J1 covered with the gene sample and the traditional target plate T1 into the MALDI-TOF mass spectrometer for detection.
[0110] parameter settings:
[0111] Turing mode: linear
[0112] Mass Range: 3000-9000
[0113] Max Laser Rep Rate: 10.0
[0114] Power: 90
[0115] Profiles: 40
[0116] Shots: 10
[0117] Compare the detection results of the two target plates.
[0118] Such as Figure 5 As shown, the T1 target plate has a high baseline, few peaks, poor accuracy, and low signal-to-noise ratio; the J1 substrate has a low baseline, more peaks, high accuracy, and a high signal-to-noise ratio.
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