3.1. Materials and Chemicals

JZ Jianan Zhang
YL Yang Liu
LJ Liwen Jiang
TZ Tiantian Zhao
GS Guowan Su
MZ Mouming Zhao
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Fresh bovine arteries were purchased from Nansha market (Guangzhou, China). Elastase and N-Succinyle-Ala-Ala-Ala-pNA were purchased from Sigma-Aldrich (Shanghai, China). Alcalase® 2.4L (200,000 U/mL) was obtained from Novozymes (Bagsvaerd, Denmark). All the solvents for chromatographic analyses were of HPLC grade. Other reagents were of analytical grade.

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