Patent ID: 9638706
Date: 2017-05-02
CPC Classifications: G01N,Y10T

Claim:
1. An external standard solution comprising: (1) water or buffer, (2) at least one amino acid selected from the following Components A, at a concentration of 0.0007 M to 0.49 M per amino acid; and (3) at least one of (i), (ii), or (iii): wherein the Components A are valine, glycine, alanine, and glutamine; wherein the Components B are serine, proline, threonine, taurine, leucine, isoleucine, lysine, histidine, phenylalanine, and tyrosine; wherein the Components C are asparagine, ornithine, arginine, and tryptophan; and wherein the Components D are glutamic acid, methionine, citrulline, and cystine.