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Hi Alain,

thank you so much for answering. I have seen your contact on the TM sprayer manual and was thinking to contact you. Good you are here and the discussion is available to all of us. Let’s keep the discussion as open as possible.

I have changed a bit the protocol and it is quite similar to what you are suggesting.

<Solvent>30% ACN + 40% IPA + 30% H2O</Solvent> (I am not using TFA cause I am analyzing lipids)
<NumPasses>10</NumPasses> (do you think 4 passes are enough? and maybe 10 are too much?)
<Concentration>5</Concentration> (I am using 5mg/ml and you are using 10, should I go for 10?)
<FlowRate>0.08</FlowRate> (80 uL/min, you are going 120 if I understood correctly)
<Velocity>1100</Velocity> (very similar to you)
<TrackSpacing>2</TrackSpacing> (also I am going 1 vert, 1 horiz. with an offset of 1mm every two steps)
<Pattern>HH</Pattern> (what’s this?)
<DryTime>5</DryTime> (should I go for 0?, it actually looks that it evaporates instantaneously)

As regard the delivery solvent I am using that mixture (30% ACN + 40% IPA + 30% H2O) instead of 70% ACN cause if you try to spot 1uL of both mixtures on a piece of glass you will see that mine moves much less than yours. I had this experience from my previous MALDI project were I have seen that a mixture of IPA and ACN spreads much less than ACN, if there is water is even better. You can try it out if you want but i think it does not make a major difference, as you say it evaporates very fast.

My project is about analyzing cholesterol and oxysterols after on-tissue (mouse brain) enzymatic assisted derivatization.
The major problem in my case is that with so many treatments it’s hard to pin point which one to optimize first. But maybe this is offtopic and I will send you a specific email about the whole thing. I definitely would need some advice.