| abstract |
A compound of the formula I n n n wherein R is H or —N═N-2-carboxyphenyl; A is (CH 2 ) n or —CH═CH—, wherein n is an integer from 0 to 10, or A may also be —CH(COOH)— when R is —N═N-2-carboxyphenyl; and X is a radical selected from the group consisting of: (i) Cl; (ii) COOR 1 , wherein R 1 is p-nitrophenyl or N-succinimidyl; (iii) CONH—NHR 2 , wherein R 2 is H, COO(t-butyl) or COObenzyl; (iv) CONH—[B]—NHR 3 , wherein R 3 is H, COOR 1 , or CO-[B′]-maleimido, wherein R 1 is t-butyl, p-nitrophenyl or N-succinimidyl, and B and B′, the same or different, are (CH 2 ) n wherein n is an integer from 2 to 10; (v) CONH—[B]—COOR 4 , wherein R 4 is H, C 1 -C 8 alkyl, N-succinimidyl; (vi) CONH—[B]—OH; (vii) CONH—[B]—CONH—NHR 2 , wherein R 2 is H, COO(t-butyl) or COObenzyl; and (viii) NHR 2 , wherein R 2 is H, COO(t-butyl) or COObenzyl, when A is —CH(COOH)— and R is —N═N-2-carboxyphenyl. The 4′-hydroxyazobenzene-2-carboxylic acid (HABA) compounds are novel reagents for labeling, isolation and detection of biological molecules. |