TGpeptide provides fluorescent labelings including FITC, FAM, TAMRA, MCA etc.
      Here are structures for part of them:

      Here we list Ex(nm) and Em(nm) for Fluorescent dyes in following table:

· FITC

      FITC is more reactive than carboxy fluorescein, which must also be activated before use. After the selective unmasking of a protecting group, FITC might react with either lysine, an ornithine side chain, or with a primary amino group at the N-terminus of the growing peptide. In this latter case, an alkyl spacer such as aminohexanoic acid (Ahx) is introduced between the last amino acid and the thiourea linkage that is generated during the reaction between isothiocyanate and amine. FITC can react extensively with sulfhydryl groups， such as the side chains of reduced cysteine residues too.

· AMC

      AMC(7-Amino-4-methylcoumarin) is another widely used fluorescein, but AMC is different because it is labeled at C-terminal of peptide:
      （1）AMC reacts with alfa- carboxy of first amino acids at C-terminal(AA-AMC);
      （2）Synthesize the left peptides sequence (from the second amino acid from C-terminal of the peptide) using SPPS;
      （3）Couple AA-AMC what we get in step (1) to full-protected peptides what we get in step (2) using liquid phase reaction;
      （4）Make cleavage for peptide what we get in step(3), then we get AMC labeled peptide.

      Basically, Fluorescent dyes such as biotin and FITC can generally be added to either the N- or C-terminus of a peptide. But we recommend adding such modifications to the N terminus of peptides because it results in shorter turnaround time, is more likely to be successful, and does not require additional coupling steps. The addition of an N-terminal modification is the final step in the SPPS protocol because peptides are synthesized from the C- to the N-terminus. We also recommended that clients include a flexible spacer, such as the six-carbon linker Ahx, in their synthetic peptide projects because it increased the stability of the fluorescent label. FITC can also be linked readily to the thiol of cysteine or an amino group of lysine.