ABSTRACT
Objective To study the toxicity and physical, chemi ca l and antimicrobial properties of the tracheal catheter made with nanometer anti microbial plastics. Methods For examining the toxicity of the n ew tracheal catheter, 30 Kunming mice were divided into 3 groups. The mice in gr oup A received 2ml of fluid sucked through the catheter by intra-abdominal inje ction, the mice in group B received 1ml of suction fluid, and the mice in group C received 2 ml of normal saline. Multiple proportional dilutions were used to d etect the antimicrobial property of the tracheal catheter against both positive and negative Gram bacteria. Results No noxious effects or toxic ity was found in tested mice, and all the physical and chemical data of the cath eter were up to the National Standard. The catheter showed a certain antimicrobi al effects on some of common pathogenic bacteria. Conclusion Th e tracheal catheter made with nanometer antimicrobial plastics had no noxious ef fects on mice, it showed a certain antimicrobial effects on to some of common pa thogenic bacteria, and its physical and chemical properties were up to the Natio nal Standard.
ABSTRACT
This paper is to study the stability of recombinant human epidermal growth factor (rhEGF) in artificial intestinal juice and gastric juice,providing references for its clinical application in intestinal and stomach injury.RhEGF was added into artificial intestinal juice and gastric juice respectively, and the content of rhEGF was determined with RIA at preset time points. The content of rhEGF in artificial gastric juice (pH 2) and intestinal juice (pH 6.8) had a tendency to decrease as time went by,reaching 43.46% and 21.91% from their baselines 1 h later respectively. But the decrease of rhEGF reached 89.62% and 79.52% 1 h after the presence of peptic enzymes respectively. The rhEGF in the artificial intestinal juice and gastric juice was relatively stable but the process of its inactivation could be greatly expedited in the presence of peptic enzymes.