Identification and quantification of antitumor thioproline and methylthioproline in Korean traditional foods by a liquid chromatography-atmospheric pressure chemical ionization-tandem mass spectrometry

- LC-APCI-MS/MS method has been developed for the determination of thioproline and methylthioproline in foods.
- Thioproline and methylthioproline were identified and quantified in the traditional Korean fermented foods.
- Their formation precursors were discussed.