Supplier Page from Aladdin Scientific Corporation for Potassium phosphate buffer
4-Amino-L-phenylalanine, HCl from Aladdin Scientific Corporation
Tetraheptylammonium bromide from Aladdin Scientific Corporation
Tris(hydroxymethyl)aminomethane from Aladdin Scientific Corporation
Z-Ala-Ala-OH from Aladdin Scientific Corporation