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  • Selbbub
    Junior Member
    • Mar 2012
    • 1
    #1

    Sonication woes

    Hi everyone,

    I am having some difficulties optimising sonication and would like some advice I am trying to sonicate approx. 12 million cells in 1.5ml lysis buffer using a Sonics Vibra Cell. I'm currently using 40% amplitude and 10 sec bursts, however after 40x10 seconds my chromatin is an even smear from 200-2000 bp with no concentrated region. This size range so far seems to be working for regular ChIP, but obviously isn't anywhere near small enough for ChIPSeq.

    It seems like I am already sonicating a lot compared to what most other people need to do.. any suggestions?
    Tags: None
    • jo_4
      Junior Member
      • Sep 2012
      • 1
      #2
      Hi selbbub,
      What kind of cells are you using? Does your lysis buffer have 1% SDS? Trying to reduce the volume to 600ul might work..

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