姜黄素与邻苯二酚共晶的太赫兹光谱  

Terahertz spectra of curcumin and catechol co-crystals

作　　者：郑转平 刘榆杭 赵帅宇 蒋杰伟 卢乐 Zheng Zhuan-Ping;Liu Yu-Hang;Zhao Shuai-Yu;Jiang Jie-Wei;Lu Le(School of Electronic Engineering,Xi’an University of Posts&Telecommunications,Xi’an 710121,China)

机构地区：[1]西安邮电大学电子工程学院,西安710121

出　　处：《物理学报》2023年第17期176-183,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62276210);陕西省自然科学基础研究计划(批准号:2022JM-380)资助的课题.

摘　　要：姜黄素是一种具有抗炎、抗氧化及抗癌等作用的常用药物,但是其在水中的溶解度较低.近年来,药物共晶是一种增强水溶性有限药物溶解度和溶解性的有效方法.基于此,本文利用太赫兹时域光谱技术(THz-TDS)研究了姜黄素与邻苯二酚共晶的太赫兹光谱.首先测试了姜黄素、邻苯二酚、二者物理混合及其共晶在0.5—3.5 THz的实验谱.实验数据显示共晶获得的位于3.31 THz处的吸收峰明显区别于原料物质,表明THz-TDS可以有效鉴别姜黄素、邻苯二酚及其共晶体;基于密度泛函理论,对姜黄素与邻苯二酚共晶体可能存在的4种理论晶型进行结构优化与频谱模拟,其中理论晶型Ⅲ模拟结果与实验数据比较符合.研究发现,共晶体是通过姜黄素的羰基C10=O3与邻苯二酚的羟基O61—H55形成氢键而成,共晶的THz特征吸收峰是在氢键带动下由共晶中两分子的官能团共同作用产生的.Curcumin(CUR)is a commonly used pharmaceutical with anti-inflammatory,antioxidant and anti-cancer effects,but its solubility in water is relatively low.In recent years,pharmaceutical co-crystal has been an effective method of enhancing the solubility of limited water-soluble pharmaceuticals.Based on this,terahertz time-domain spectroscopy(THz-TDS)is used to study the THz spectra of curcumin-catechol co-crystal.Firstly,the experimental spectra of curcumin,catechol(CTL),their physical mixture and their co-crystal are measured in a range of 0.5–3.5 THz,respectively.The experimental data show that CUR obtains six THz absorption peaks,while CTL possess three THz absorption peaks,the physical mixture obtains four absorption peaks,and their CUR-CTL co-crystal obtains three absorption peaks.These results indicate that THz-TDS can effectively identify curcumin,catechol and their co-crystals.The fact that the absorption peak at 3.31 THz obtained in co-crystal is entirely different from those of raw materials,implying that new weak interactional forces are generated between CUR molecule and CTL molecule,the co-crystal forms a new three-dimensional structure compared with their raw materials.These results are also verified by X-ray diffraction spectra of raw material and their Co-crystal.Moreover,four possible theoretical forms of curcumin-catechol co-crystal are optimized and simulated by using density functional theory(DFT).The calculated results indicate that the data of co-crystal form III are in good agreement with the experimental spectrum,and the simulation effectively reconstructs the experimental spectrum.So it can be inferred that the co-crystal is formed through the hydrogen bond between the carbonyl C10=O3 of CUR and the hydroxy O61-H55 of CTL.In addition,depending on the good match between experimental data and theoretical results,it is found that the three absorption peaks in the co-crystal do not origin from the action of a single molecule,but the joint action of the functional groups of the two molecules un

关 键 词：姜黄素 共晶 太赫兹波 吸收谱 

分 类 号：TQ460.1[化学工程—制药化工] O657.3[理学—分析化学]