RESUMO
Objective To prepare hydrophobic chitosan from Catharsius molossus and study its hemostatic effect. Methods The chitosan from C. molossus was used as material to carry out hydrophobic modification and characterization by acylation with lauric anhydride. At the same time, the hemostatic effect was studied by in vitro agglutination test and mouse liver wound experiment. Results The prepared hydrophobic chitosan had a hydrophobic group substitution degree of (11.69 ± 0.14)%, which was higher than that of commercially available hydrophobic chitosan. The in vitro agglutination experiment showed that it could coagulate in (3.42 ± 0.39) s when mixed with blood at a concentration of 6.0 mg/g, which was better than chitosan and hydrophobically modified commercial chitosan. The mouse liver wound experiment showed that chitosan from C. molossus could shorten hemostatic time significantly compared with chitosan and hydrophobically modified commercial chitosan. Conclusion Hydrophobically modified chitosan can significantly improve the coagulation performance of chitosan, and the hydrophobic chitosan from C. molossus is excellent, and it is expected to be a new hemostatic material with great potential.
RESUMO
Objective To optimize the technique of foam separation from extract of Catharsius molossus.Methods Single factor test was used to examine the key operational parameters by using enrichment ratio,recovery rate,and protein content as the evaluation indexes.Results The best conditions were as follow: airflow velocity,feed concentration,pH value,feed volume,and temperature were 600 mL/min,0.050 g/mL,pH 4,1 000 mL,and room temperature,respectively.Under the condition,the enrichment ratio was 1.56,recovery rate was 85.6%,and protein content was 20.37%.Conclusion Foam separation could be used to concentrate and separate protein from extract of C.molossus with higher recovery rate and protein content.