Chromatography Forum

Posted: **Wed Jan 04, 2012 12:51 am**

Dear users,

I am seeking an answer of a strange phenomenon in my GC-MS results. I conducted an objective analysis using GC-MS towards a certain papaya variety extract to see the volatile patterns. The result showed that naphthalene occured at 30.45 minute. I conducted another test using the same method and column but different papaya variety. The result was naphthalene occured at different retention time: 37.12. What had happened?

Posted: **Wed Jan 04, 2012 6:26 am**

One or both of the peaks that the MS search says is naphthalene, is not naphthalene Or a system fault, or operator error.

Peter

Posted: **Thu Jan 05, 2012 3:57 am**

Thank you, Mr. Peter. =]

Posted: **Fri Jan 06, 2012 8:08 pm**

Look for the match with the library ; is it higher for one of the compounds ?

Which software are you using ? ChromaTOF is known to find a lots of "false positives".

You really need to compare with standards to confirm compounds retention time.

Hope that helps,

Fée

Chromatography Forum

different retention time though the methods are the same

different retention time though the methods are the same

Re: different retention time though the methods are the same

Re: different retention time though the methods are the same

Re: different retention time though the methods are the same