title: The in vivo degradation, absorption and excretion of PCL-based implant.
abstract: The in vivo degradation of poly (epsilon-caprolactone)(PCL) was observed for 3 years in rats. The distribution, absorption and excretion of PCL were traced in rats by radioactive labeling. The results showed that PCL capsules with initial molecular weight (Mw) of 66000 remained intact in shape during 2-year implantation. It broke into low molecular weight (Mw=8000) pieces at the end of 30 months. The Mw of PCL deceased with time and followed a linear relationship between logMw and time. Tritium-labeled PCL (Mw 3000) was subcutaneous implanted in rats to investigate its absorption and excretion. The radioactive tracer was first detected in plasma 15 days after implantation. At the same time radioactive excreta was recovered from feces and urine. An accumulative 92% of the implanted radioactive tracer was excreted from feces and urine by 135 days after implantation. In the mean while, the plasma radioactivity dropped to the background level. Radioactivity in the organs was all close to the background level confirming that the material did not cumulate in body tissue and could be completely excreted.
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, The Tianjin Key Laboratory of Biomaterial Research, Tianjin 300192, PR China.
authors.forename: Hongfan
authors.initials: H
authors.lastname: Sun
authors.forename: Lin
authors.initials: L
authors.lastname: Mei
authors.forename: Cunxian
authors.initials: C
authors.lastname: Song
authors.forename: Xiumin
authors.initials: X
authors.lastname: Cui
authors.forename: Pengyan
authors.initials: P
authors.lastname: Wang
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001673:Biodegradation, Environmental; D005243:Feces / Q000737:chemistry; D005260:Female; D008970:Molecular Weight; D011091:Polyesters / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D014018:Tissue Distribution; D014316:Tritium / Q000032:analysis / Q000378:metabolism / Q000652:urine
chemical_list: D011091:Polyesters; D014316:Tritium; C016240:polycaprolactone