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Different malonaldehyde-amine condensation products were tested for their relative color contribution to the thiobarbituric acid (TBA) test, an indicator for oxidative rancidity of polyunsaturated lipids. The open chain mono-and disubstituted malonatdehyde (M) addition products (R-N=CH-CH=CHOH and R-N=CH-CH=CH-NH-R) gave complete (100%) recovery of M on a mole basis. When the __M residue was incorporated into cyclic products which formed between the ureido-or guanidino-substituents of a-amino acids such as citrulline or arginine and M, recovery of ~ by the TBA color test was 30% and 6%, respectively. Products, from imine-amine type interactions, containing the __M residue as in pyrazoline or pyrazole ring systems, released from 4% to no __M.

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