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The objective of this study is to determine if when chymopapain is loaded onto a nano-carrier, an injection of it reduces the spreading range of the drug within the discs. The materials for the experiment, which were conducted for three weeks, included fifteen intervertebral discs taken from two cadavers, which were divided according to the types of injected chymopapain solutions as follows: ordinary chymopapain group and nano-carrier system group. The nano-carrier system group was again divided into two subgroups according to the types of pluronics, the basic material for the nano-carriers: Pluronic F 127(DA-PF 127) in the nano-carrier group and Pluronic F 68(DA-PF 68) in the nano-carrier group. The results showed that the action of chymopapain using a pluronic-based nano-carrier system was localized around the center of the injection site instead of broad spreading, compared to that of the ordinary chymopapain group (p<0.01). This characteristic suggests a possible application to effective agents for minimally invasive spinal treatment through which disc lesions were removed selectively.

Study of the enzymatic action of the chymopapain using pluronic based nano-carrier system on the cadaveric nucleus pulposus tissue