Determination of lysine with ninhydrin-ferric reagent.

@article{Hsieh1995DeterminationOL,
  title={Determination of lysine with ninhydrin-ferric reagent.},
  author={Chia-Lung Hsieh and Kuang-pin Hsiung and Juliet Su},
  journal={Analytical biochemistry},
  year={1995},
  volume={224 1},
  pages={
          187-9
        }
}
Ninhydrin-ferric reagent reacts highly and specifically with lysine at a pH value of 1.0. Ferric ion inhibits the reaction of ninhydrin with proline, ornithine, glycine, arginine, and histidine. This method can be used to determine a lysine sample of high concentration without dilution. It has a linear response range from 0.0625 to 0.5 mg lysine.HCl. 
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