Quantification of Phytochemicals from Commercial Spirulina Products and Their Antioxidant Activities

Figure 2

HPLC chromatogram of the standard free amino acids. The peaks numbers refer to the free amino acids listed in Table 5. Peaks numbers 1, aspartate; 2, glutamate; 3, asparagine; 4, serine; 5, S-methylmethionine (vitamin U); 6, glutamine; 7, histidine; 8, glycine; 9, threonine; 10, arginine; 11, alanine; 12, gamma-aminobutyric acid (GABA); 13, tyrosine; 14, cystine; 15, valine; 16, methionine; 17, norvaline; 18, tryptophan; 19, phenylalanine; 20, isoleucine; 21, leucine; 22, lysine.