Hi, Tomas
Did you get my email and files?
chunchao
Quoting Chunchao Zhang <[email protected]>:
> Thank you Tom. My sample are pure histone H3 digested with trypsin.
> So spectrum won't be so complex as the whole cell extract. I don't
> think that there are so many chemical compounds with same formula.
> The raw data was generated from orbi-trap mass spec. Also, it looks
> the parameter doesn't change the results significantly. Typically,
> the mass detection was selected as exact mass with noise level:
> 3.00E4; FTML shoulder peak filterer: Resolution 30,000, gaussian;
> chrom construction was set as min time span: 7min, min height:
> 3.00E4, m/z tolerance: 0.005.
>
> chunchao
>
>
>
> Quoting Tomas Pluskal <[email protected]>:
>
>> Hi Chunchao,
>>
>> It is possible there are peaks with same m/z and different
>> retention times. There are many chemical compounds with same
>> formula (= mass) but different structure.
>> Please send us the XIC plots of the detected peaks (go to your peak
>> list, then right click on the peak, Show TIC). Or you can send
>> your raw data file and what parameters you used.
>> Without looking at the data, we cannot give you any advice.
>>
>> Tomas
>>
>> On Nov 30, 2010, at 1:49 AM, Chunchao Zhang wrote:
>>
>>> To whom it may concerns,
>>> I'm currently using mzmine software to exact ion chromatograph
>>> from LC-MS data. I first ran the Chromatogram builder algorithm to
>>> detect chromatograph then did deconvolution of chromatograms after
>>> peak detction. One of problem is I found multiple peaks with same m/z
>>> ratio in the peak list but with different RT, height and Area etc.
>>> Because my data came from high-resolution mass spec with high-mass
>>> accruracy, I would like to see one peak corresponding to one m/z ratio
>>> in the peak list. So I was wandering if there is anything wrong in
>>> what I did for XIC. Thanks!
>>>
>>> chunchao
>>>
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>>
>> ===============================================
>> Tomas Pluskal
>> G0 Cell Unit, Okinawa Institute of Science and Technology
>> 1919-1 Tancha, Onna-son, Okinawa 904-0412, Japan
>> TEL: +81-98-966-8684
>>
>>
>>
>>
>>
>>
>>
>
>
>
------------------------------------------------------------------------------
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