LIMSA

Website

http://www.helsinki.fi/science/lipids/software.html

Description

Lipid Mass Spectrum Analysis (LIMSA) provides deconvolution, metabolite identification and quantification of lipidomics LC-MS data. Firstly background subtraction is performed (the spectra are divided into equal segments, a median filter is used and the lowest intensity of each segment is found and linear regression is calculated through the lowest points). Next the raw data are smoothed with a Gaussian filter and the local maximums are selected as candidate peak positions and local minimums as peak limits and the peaks are integrated between these limits. The user then specifies a compound list from the internal database, which contains >3000 lipids along with common fragments/adducts and lipids are identified. The user can add sum formula to the database and additional isotopes to the isotope database. There are three methods of deconvolution available: subtraction, linear fit and a Gaussian peak model. It is available as an Excel add-in or a standalone command line program.

Functionality

• Preprocessing
• Annotation/MS

Instrument Data Type

• MS/LC-MS
• MS/DI-MS/DI-MS/MS

Approaches

• Lipidomics

Computer Skills

Medium

Software Type

• Excel Add-in/ Package

Interface

• Command line interface
• Graphical user interface

Operating System (OS)

• Unix/Linux
• Windows

Language

C++

Dependencies

N/A

Input Formats - Open

Peaklist

Input Formats - Proprietary

N/A

Published

2006

Last Updated

2006

License

GPL

Paper

http://www.ncbi.nlm.nih.gov/pubmed/17165823

PMID

17165823