[3dem] Contaminated Quantifoil? R 1.2/1.3 + 2 nm carbon grids

[Nadav Elad]

Dear Jean-Marc

I had similar contamination on Quantifoil grids with 2nm carbon a few years ago. After complaining they did send other sample grids for testing, but I don't think that ever I got a replacement box. The whole procedure took around two years...
I did not try cleaning the grids though. 
Best
Nadav


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Today's Topics:

   1. Contaminated Quantifoil? R 1.2/1.3 + 2 nm carbon grids
      (jean-marc.jeckelmann at unibe.ch)


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Message: 1
Date: Fri, 5 Jul 2024 21:31:37 +0000
From: <jean-marc.jeckelmann at unibe.ch>
To: <3dem at ncmir.ucsd.edu>
Subject: [3dem] Contaminated Quantifoil? R 1.2/1.3 + 2 nm carbon grids
Message-ID: <185590E4-45F6-4332-A7DA-E05682CB5612 at unibe.ch>
Content-Type: text/plain; charset="utf-8"

Dear all,
we have found black-spot-contaminations on several Quantifoil? R 1.2/1.3 + 2 nm carbon grids. The gris originate from four different grid boxes containing each 100 grids per box (approximate value ~3000 CHF; most severe case see attachment).
Within the past year we tried several times to reach to Quantifoil and asked for guidance. Unfortunately, Quantifoil never provided us with an answer.
Does anybody know how to somehow ?clean" these 2 nm carbon layer containing grids ?
Thanks for your input,
Jean-Marc


[cid:AC773B97-D334-48A3-AECE-40E0C3FED941]

____________________________
Jean-Marc Jeckelmann, PhD
Institute of Biochemistry and Molecular Medicine University of Bern B?hlstrasse 28
CH-3012 Bern
+41 31 684 3 470
jean-marc.jeckelmann at unibe.ch<mailto:jean-marc.jeckelmann at unibe.ch>

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