Hi,
I'm testing shearing conditions using a covaris S2 to shear chromatin to 150~300 bp for ChIP-Seq. My sample consists of mouse embryonic limbs in 500~600 ul buffer (20 mM Tris, pH 8.0; 0.5 mM EGTA, 1mM EDTA) in a TC12 tube. My settings were 20% DC, 5 In, 200 C/B, 30 sec cycle time, varying numbers of cycle (10, 20, 30, 40, 50 cycles). I did not include treatment 2 following treatment 1 for a pause between cycles. I had a size range of 200~1,500 bp with a peak around 500~700 bp at highest cycle number. I do not know why I could not get a smaller size range. However, I noticed a substantial amount of foam formation. Is there anybody who can help me on this matter? Any advice or suggestions would be appreciated.
Thanks,
Sung D
I'm testing shearing conditions using a covaris S2 to shear chromatin to 150~300 bp for ChIP-Seq. My sample consists of mouse embryonic limbs in 500~600 ul buffer (20 mM Tris, pH 8.0; 0.5 mM EGTA, 1mM EDTA) in a TC12 tube. My settings were 20% DC, 5 In, 200 C/B, 30 sec cycle time, varying numbers of cycle (10, 20, 30, 40, 50 cycles). I did not include treatment 2 following treatment 1 for a pause between cycles. I had a size range of 200~1,500 bp with a peak around 500~700 bp at highest cycle number. I do not know why I could not get a smaller size range. However, I noticed a substantial amount of foam formation. Is there anybody who can help me on this matter? Any advice or suggestions would be appreciated.
Thanks,
Sung D