A new prepolymer of resol phenol–formaldehyde resin

Investigation of serum amino acids involved in gallic acid detoxification of formaldehyde by liquid chromatography/tandem mass spectrometry and neutral loss scan

“…This is probably because the amino acids in the serum and the model solution have a catalytic effect on the gallic acid detoxification of formaldehyde. In our experience, the adduct of gallic acid+formaldehyde is difficult to obtain as a pure compound, because the adduct is an unstable intermediate product or prepolymer . However, the Mannich adduct of gallic acid+phenylalanine+formaldehyde can be readily obtained as a pure compound and it is stable enough for the purification and NMR structural elucidation.…”