Quenching-Chemiluminescence Determination of Trace Amounts of l-Tyrosine Contained in Dietary Supplement by Chemiluminescence Reaction of an Iron-Phthalocyanine Complex

Table 3

Determination of L-tyrosine of dietary supplement.

Sample	Added (M)	Found (M)	Recovery (%)	RSD (𝑛=5)
Sample A^a (soft drink)	2.00 × 10^−6 M	1.96 × 10^−6 M	98%	2.42%
Sample B^b; (component indicated value of supplement)*	—	2.04 × 10^−6 M; (2.00 × 10^−6 M)*	—	2.95%

^aComponent: aspartic acid, arginine, lysine, glutamic acid, glycine, proline, alanine, leucine, isoleucine, valine, ornithine, citrulline.
^bComponent: protein, lipid, carbohydrate, sodium, vitamin B₁, vitamin B₆, twenty kinds of the amino acid including the L-tyrosine.
*Indicated value of medicine.