Hi Felipe, > I’m a Brazilian student who works with metabolomics, and I would like to ask > you some questions regarding the tool MZmine 2.9. > I read the manual section on Mzmine 2.9 "Adduct search" where it says that I > have to select the possible options "sodium", "potassium" ... etc., if the > data comes from a positive ionization mode of LC / MS. > My First question is: Do I need to build a database of possible masses of > substances, adding them the isotopic masses of sodium, potassium, etc. > (Custom database search)?
No, you do not need to use the Custom database search at all. > > The second one is: Should I build another database of possible masses of > substances, this time subtracting from them the required mass in case the > analysis is performed in negative ionization mode? There is no need to create separate lists for positive and negative modes. Please note that this module does _not_ search for ionization adducts, but instead it searches for neutral adducts that are attached to the main ion. Best regards, Tomas =============================================== Tomas Pluskal G0 Cell Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan WWW: https://groups.oist.jp/g0 TEL: +81-98-966-8684 Fax: +81-98-966-2890 ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Mzmine-devel mailing list Mzmine-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mzmine-devel