Terephthalaldehyde

Terephthalaldehyde is a crosslinking agent. Terephthalaldehyde forms a crosslinked structure inside the gelatin matrix by forming Schiff base imines with the amino groups of gelatin, thereby constructing a three-dimensional network. Terephthalaldehyde improves the hydrophobicity of the gelatin matrix, delays water vapor penetration and enhances the liquid water resistance of gelatin films. Terephthalaldehyde can be used as a crosslinking agent to prepare crosslinked chitosan hydrogel (CAAT) via ultrasound-induced synthesis. Terephthalaldehyde helps CAAT hydrogels selectively adsorb anionic dyes from aqueous media, including multi-component systems containing cationic dyes. Terephthalaldehyde serves as a starting material for the synthesis of bis-heterocyclic compounds (including bis-thiazole and bis-triazolopyrimidine compounds)^[1][2][3]. In Vitro: Terephthalaldehyde (0.005-0.025 g/g gelatin) consistently induces chemical cross-linking of porcine skin gelatin solutions at 60 °C, with a 100% sol-gel transition rate and average gel formation time of 25 min at 0.005 g TPA/g gelatin, while cross-linking is inconsistent or absent at lower temperatures^[1].
Terephthalaldehyde (0.025 mol L^-1; 25-30 min stirring, 40 min ultrasonication at 40 °C, 2-3 days setting) crosslinks chitosan-acrylic acid to form the CAAT hydrogel, which has a homogeneous porous amorphous structure, high thermal stability, extreme hydrophilicity with 3287% maximum swelling at pH 10, and follows Fickian swelling kinetics^[2].