Chemicals and reagents

YD Yu Duan
XS Xiaowen Shang
GL Guodong Liu
ZZ Zhongwei Zou
XZ Xujun Zhu
YM Yuanchun Ma
FL Fang Li
WF Wanping Fang
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All chemicals and reagents were analytical grades. Methyl alcohol, acetonitrile, and ethyl alcohol were purchased from Merck Company, Germany (www.merckchemicals.com). Milli-Q system (Millipore Corp., Bedford, MA, USA) ultrapure water was used throughout the study. Authentic standards were purchased from BioBioPha Co., Ltd. (www.biobiopha.com/) and Sigma-Aldrich, USA (www.sigmaaldrich.com/unitedstates.html).

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