Welcome to the GenScript online toolkit. Use this free peptide tool to calculate the chemical formula and molecular weight of your antigen or other peptide.

Calculator is hosted on GenScript's secure web server. Your data are protected using Verisign encyption technololgy.

This service is available to the general public at no charge.


Instructions:

1. Input your peptide's sequence data.  Please use only the two codes specified on our Amino Acid Code Table . Please use braces {} with three-letter entries, like so: AC{GLY}{ILE}{d-GLY}.
2. Indicate what, if any, modifications have been made to the peptide.
3. Indicate the locations of any disulfide bridges.  An entry of 5-12, 15-24 indicates on bridge between positions 5 and 12 and another between 15 and 24.

Sequence:

N-Terminal Modification: No N-Terminal Modification 5-FAM (N-Terminal)5-FAM-Ahx (N-Terminal)Abz (N-Terminal)Acetylation (N-Terminal)Biotin (N-Terminal)Biotin-Ahx (N-Terminal)Br-Ac- (N-Terminal)CBZ (N-Terminal)Dansyl (N-Terminal)Dansyl-Ahx (N-Terminal)DTPA (N-Terminal)Fatty Acid (N-Terminal)FITC (N-Terminal)FITC-Ahx (N-Terminal)Fmoc (N-Terminal)Formylation (N-Terminal)HYNIC (N-Terminal)MCA (N-Terminal)Myristoyl (N-Terminal)Palmitoyl (N-Terminal)PEG2000 at (N-terminal)PEG5000 at (N-terminal)PEN (N-Terminal)TMR (N-Terminal)

C-Terminal Modification: No C-Terminal Modification Alcohol (C-Terminal)Aldehyde (C-Terminal)AMC (C-Terminal)Amidation (C-Terminal)Bzl (C-Terminal)CMK (C-Terminal)Cysteamide (C-Terminal)Ester (OEt) (C-Terminal)Ester (OMe) (C-Terminal)Et (C-Terminal)FMK (C-Terminal)MAPS Asymmetric 4 branches (C-Terminal)MAPS Asymmetric 8 branches (C-Terminal)Me (C-Terminal)NHEt (C-Terminal)NHisopen (C-Terminal)NHMe (C-Terminal)OSU (C-Terminal)tBu (C-Terminal)TBzl (C-Terminal)

Other Modifications:
Abz/DNP Abz/Tyr (3-NO2) BSA (-COOH of C terminal) BSA (-NH2 of N terminal) BSA Conjugation on cysteine DABCYL DABCYL/Glu(EDANS)-NH2 EDANS/DABCYL Glu(EDANS)-NH2 Head to tail Cyclic KLH (-COOH of C terminal) KLH (-NH2 of N terminal) KLH Conjugation on cysteine MCA/DNP p-Nitroanilide PEG2000 attached at Cysteine PEG5000 attached at Cysteine Succinylation Tyr (3-NO2) mini-PEG1

Disulfide Bridge (Format: 5-12, 15-24):

Note

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