Preparation and Characterization of Polyamidoamine G2.0-Hematin as a Biocatalyst for Fabricating Catecholic Gelatin Hydrogel

• Main Authors: Tan Phuoc Ton, Thi Yen Nhi Tran, Le Hang Dang, Kim Thi Hoang Nguyen, Phuong Doan, Van Toan Nguyen, Dinh Trung Nguyen, Bao Huy Le, Ngoc Quyen Tran, Bich Tram Nguyen
• Format: Article
• Language: English
• Published: Hindawi Limited 2021-01-01
• Series: International Journal of Polymer Science
• Online Access: http://dx.doi.org/10.1155/2021/5563229

In this study, we report that an enzyme-mimicking biocatalyst polyamidoamine (PAMAM) dendrimer G2.0-hematin (G2.0-He) was fabricated successfully. The chemical structure of G2.0-He was verified by 1H NMR and FT-IR spectroscopy. G2.0-He exhibited a size distribution from 11.6±1.7 nm to 12.5±2.9 nm and a zeta potential from 32.5 mV to 25.6 mV along with the enhancement of the hematin conjugation degree. The relative activity of G2.0-He was evaluated based on pyrogallol oxidation reactions at pH=7. The results showed that G2.0-He was more stable than horseradish peroxidase (HRP) enzyme in high H2O2 concentrations. The HRP-mimic ability of G2.0-He was also confirmed by the catalyzation when preparing catecholic gelatin hydrogels under mild conditions. Moreover, our results also revealed that these hydrogels performed with excellent cytocompatibility in an in vitro study and could be used as a potential scaffold for adhesion and proliferation of fibroblast cells. The obtained results indicated that G2.0-He is a suitable platform for altering the HRP enzyme in several biomedical applications.