Notice of RetractionPreparation of Aloe Gel Formaldehyde Scavenger and Its Application in Oxazolidine Tanning Leather

Abstract

Aloe gel was hydrolyzed by acid protease, and the amino nitrogen content was as index. The effect of pH, temperature, time, aloe gel concentration and the dosage of acid protease was studied. The optimal conditions were that pH was 3.5, temperature was 40°C, the dosage of acid protease was 4%, time was 4h and the concentration of aloe gel was 4.5%. Under the conditions, the amino nitrogen content was 0.197%. The FTIR and amino acid analysis results showed that the peak of C=0 and N-H obviously became stronger. Furthermore, the amino acid analysis results showed that aloe gel hydrolyzate contained 17 amino acids, and proline had the highest content. It was used to remove formaldehyde in oxazolidine tanning leather, and the application results showed that the formaldehyde-removal rate was 37.23%.