in biological samples has great importance for biomedical studies.
Amino acid tyrosine(Tyr) that usually coexist with Trpinbiological fluids can significantly interfere with
reliable determination of Trp.
In the current study,we demonstrate the development of two ultrasensitive
electrochemical sensor and labelfreeapta sensor for selective analysis of Trpinbiological samples(i.e.,
cow's milk and humanplasma,saliva and urinesamples).