Preparation of Curcumin–Piperazine Coamorphous Phase and Fluorescence Spectroscopic and Density Functional Theory Simulation Studies on the Interaction with Bovine Serum Albumin

• DOI: 10.1021/acs.molpharmaceut.7b00217
• Publication Date: 2017-07-13T13:48:54Z
• Authors: Wenzhe Pang; Jie Lv; Shuang Du; Jiaojiao Wang; Jing Wang; Yanli Zeng
• Keywords: Piperazine; Thermogravimetric analysis; Bovine serum albumin

In the present study, a new coamorphous phase (CAP) of bioactive herbal ingredient curcumin (CUR) with high solubilitythe was screened pharmaceutically acceptable coformers. Besides, to provide basic information for best practice physiological and pharmaceutical preparations CUR-based CAP, interaction between CAP bovine serum albumin (BSA) studied at molecular level in this paper. CUR piperazine molar ratio 1:2 prepared by EtOH-assisted grinding. The as-prepared characterized powder X-ray diffraction, modulated temperature differential scanning calorimetry, thermogravimetric analysis, Fourier-transform infrared, solid-state 13C nuclear magnetic resonance. stoichioimetry sustained C═O···H hydrogen bonds N-H group C═O CUR; stabilized diketo structure CAP. dissolution rate CUR-piperazine 30% ethanol-water faster than that t50 values were 243.1 min 4.378 Furthermore, interactions BSA investigated fluorescence spectroscopy density functional theory (DFT) calculation. binding constants (Kb) 10.0 9.1 × 103 L mol-1 298 K, respectively. Moreover, DFT simulation indicated energy hydrogen-bonded tryptophan-CUR tryptophan-CUR-piperazine complex -26.1 -17.9 kJ mol-1, conclusion, after formation forces became weaker.