Both reagents can be purchased through Sigma ï¿½ Aldrich http://www.sigmaaldrich.com/united-states.html).
D9503-1G, D9503-5G, or D9503-25G,
DL-Tyrosine, (ï¿½)-2-Amino-3-(4-hydroxyphenyl)propionic acid, 3-(4-Hydroxyphenyl)-DL-alanine
Proper safety precautions and waste disposal methods are to be used (gloves, goggles and garbage). Dispose of excess solutions and chemicals in the manner prescribed by your chemical safety officer.
Materials for the phosphate buffer, sodium phosphate monobasic and sodium phosphate dibasic can be obtained from most biological chemical supply houses such as Flinn Scientific, Wardï¿½s Natural Science, Daigger Lab Equipment & Supplies, etc.