Computation:
Molecular Weight:

 MW =(A*71.07)+(R*156.18)+(nN*114.08)+(nD*115.08)+(nC*103.10)+
  +(nQ*128.13)+(nE*129.11)+(nG*57.05)+(nH*137.14)+(nI*113.15)+
  +(nL*113.15)+(nK*128.17)+(nM*131.19)+(nF*147.17)+(nP*97.11)+
  +(nS*87.07)+(nT*101.10)+(nW*186.20)+(nY*163.17)+(nV*99.13)+18.02

Molar absorption coefficient: Pace et al., 1995

Isoelectric point estimation: Tabb D., 2003

Type of aminoacid (1):
    Polar: SCTNQHYW
    Non-Polar: GAPVILFM
    Charged: DEKR

Type of aminoacid (2):
    Small non-polar: SCTNQHYW (Yellow)
    Hydrophobic: CVILPFYMW (Green)
    Polar: DQH (Magenta)
    Negatively charged: NE (Red)
    Positively charged: KR (Blue)