Experiment 15 in Advanced Biology with Vernier (BIO-A) and Investigation 8 in Investigating Biology through Inquiry (BIO-I) both use DL-DOPA and DL-Tyrosine as reagents.

Both reagents can be purchased through Sigma � Aldrich http://www.sigmaaldrich.com/united-states.html).

DL-DOPA, 3,4-Dihydroxy-DL-phenylalanine
(CAS# 63-84-3)
D9503-1G, D9503-5G, or D9503-25G,

DL-Tyrosine, (�)-2-Amino-3-(4-hydroxyphenyl)propionic acid, 3-(4-Hydroxyphenyl)-DL-alanine
(CAS# 556-03-6)
145726-25G, 145726-100G

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, Ward�s Natural Science, Daigger Lab Equipment & Supplies, etc.