Figure 4.
Selectivity of the probe in the presence of different biological analytes. The graph illustrates that there was a significantly increased fluorescence intensity of the probe in response to Hcy compared with other biological analytes. *P<0.05 vs. the other biological analytes. 1, cysteine; 2, Hcy; 3, N-acetylcysteine; 4, glutathione; 5, arginine; 6, asparagine; 7, aspartic acid; 8, β-alanine; 9, dithiothreitol; 10, glutamine; 11, glutamic acid; 12, glycine; 13, histidine; 14, isoleucine; 15, L-alanine; 16, leucine; 17, lysine; 18, methionine; 19, phenylalanine; 20, proline; 21, serine; 22, threonine; 23, tryptophan; 24, tyrosine; 25, valine; 26, potassium (K+); 27, sodium (Na+); 28, calcium (Ca2+); 29, magnesium (Mg2+); 30, zinc (Zn2+); 31, aluminum (Al3+); 32, cadmium (Cd2+); 33, manganese (Mn2+). Hcy, homocysteine.