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2Â¥2014-12-09 03:02:25
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lianchen1218

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2Â¥: Originally posted by fuyuandj86 at 2014-12-09 03:02:25
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4Â¥2014-12-19 11:22:45
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needle_ld

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How do you make transfer buffer?
do you have methanol? how much?
I would recommend 20%mathanol in the transfer buffer. or, maybe you can decrease your time for transfer?

Where do you get the first antibody? how do you keep the stock? if you have the bands some time ago but not now, maybe your antibody is too old? especially if the antibody is kept in fridge but not freezer.
you only do WB for cytochrome C? How about other targets? do you have any problem in house keeping (like GAPDH, tubulin)? if so, maybe the problem is more general.
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5Â¥2014-12-19 13:28:36
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lianchen1218

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ÒýÓûØÌû:
5Â¥: Originally posted by needle_ld at 2014-12-19 13:28:36
How do you make transfer buffer?
do you have methanol? how much?
I would recommend 20%mathanol in the transfer buffer. or, maybe you can decrease your time for transfer?

Where do you get the fir ...

Thank you for your suggestion.
First, I add 20% methanol in the transfer buffer. And I already decreased the time to 1 h, 110V. And used the new prepared primary antibody, increased loading to 40ug, still nothing.
Second, antibody are kept in fridge. Because the others can detect the cytochrome c with the same primary antibody, so I don't think it's the problem.
I also do other targets, GAPDH works well. Except cytochrome c, all the other staff work well.
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6Â¥2014-12-20 06:35:55
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needle_ld

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6Â¥: Originally posted by lianchen1218 at 2014-12-19 17:35:55
Thank you for your suggestion.
First, I add 20% methanol in the transfer buffer. And I already decreased the time to 1 h, 110V. And used the new prepared primary antibody, increased loading to 40ug ...

OK. Then you are correct. The problem is most likely your sample prep.
for cells, it is easy to get lysate. maybe you can try different RIPA. I am using RIPA with NP-40 and it works well.
also, it would be better if you can isolate the mitochondria and then make the lysate. it is not difficult to do so provided that you may want to have dounce which is a little bit less tight than normal homogenizer. then you can separate the lysate using percoll ultracentrifuge. you can find the protocol for MAM preparation in Nature protocol (2009). you don't need to get the MAM and the mitochondria is very easy by product of the protocol.
the other point regarding WB, don't rely on the molecular weight marker. try to terminate the SDS-PAGE earlier. 15% gel should be ok. I can do with it by 10% gel sometimes. we are using cell signaling antibody which works well.
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7Â¥2014-12-20 13:22:13
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