*Corresponding author:
Zhenning Yan, College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, ChinaReceived: May 25, 2018; Published: June 08, 2018
DOI: 10.26717/BJSTR.2018.05.001189
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Due to many factors such as drug purity, thermodynamic stability, manufacturability, and ease of handling, until now the active pharmaceutical ingredients (APIs) in the pharmaceutical industry are mainly in solid or crystalline forms.