BRAIN-package: Implementation of BRAIN (Baffling Recursive Algorithm for...
In ditti2/BRAIN: Baffling Recursive Algorithm for Isotope distributioN calculations

Description Details Author(s) References Examples

This package implements BRAIN (Baffling Recursive Algorithm for Isotope distributioN calculations) is described in full details by Claesen et al. [Clae] (see also application note [Ditt]). The algorithm uses an algebraic approach (Viete's formulas, Newton identities [Macd]) which is especially useful for large molecules due to its advantageous scaling properties. This version of the package provides functions for calculating the aggregated isotopic distribution and center-masses masses for each aggregated isotopic variant for chemical components built from carbon, hydrogen, oxygen, nitrogen and sulfur (e.g. peptides). The natural abundances and molecular masses for stable isotopes of C, H, N, O, S are taken from IUPAC 1997 [Rosm]. Also, some heuristics to faster compute isotopic distribution are applied [Ditt2].

Package:	BRAIN
Type:	Package
Version:	1.5.0
Date:	2018-08-02
License:	GPL-2
LazyLoad:	yes

Piotr Dittwald with contribution of Dirk Valkenborg and Jurgen Claesen

Maintainer: Piotr Dittwald <piotr.dittwald@mimuw.edu.pl>

[Clae] Claesen J., Dittwald P., Burzykowski T. and Valkenborg D. An efficient method to calculate the aggregated isotopic distribution and exact center-masses. JASMS, 2012, doi:10.1007/s13361-011-0326-2

[Ditt] Dittwald P., Claesen J., Burzykowski T., Valkenborg D., Gambin A. BRAIN: a universal tool for high-throughput calculations of the isotopic distribution for mass spectrometry. Anal Chem., 2013, doi: 10.1021/ac303439m

[Ditt2] Dittwald P., Valkenborg D. BRAIN 2.0: time and memory complexity improvements in the algorithm for calculating the isotope distribution. JASMS, 2014, doi: 10.1007/s13361-013-0796-5.

[Macd] Macdonald I.G., Symmetric functions and Hall polynomials / by I. G. Macdonald. Clarendon Press; Oxford University Press, Oxford : New York, 1979.

[Rosm] K.J.R. Rosman and P.D.P. Taylor. Isotopic compositions of the elements 1997. Pure and Applied Chemistry, 70(1):217-235, 1998.

  nrPeaks = 1000
  aC <-  list(C=23832, H=37816, N=6528, O=7031, S=170)  # Human dynein heavy chain  
  res <- useBRAIN(aC = aC, nrPeaks = nrPeaks)
  iso <- res$isoDistr
  masses <- res$masses
  mono <- res$monoisotopicMass
  avgMass <- res$avgMass