1
|
Wang Y, Chin CY, Shivashekaregowda NKH, Shi Q. Implications of Low-concentration Polymer on the Physical Stability of Glassy Griseofulvin: Role of the Segmental Mobility. AAPS PharmSciTech 2024; 25:103. [PMID: 38714634 DOI: 10.1208/s12249-024-02809-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 04/17/2024] [Indexed: 05/10/2024] Open
Abstract
Crystallization of amorphous pharmaceutical solids are widely reported to be affected by the addition of polymer, while the underlying mechanism require deep study. Herein, crystal growth behaviors of glassy griseofulvin (GSF) doped with various 1% w/w polymer were systematically studied. From the molecular structure, GSF cannot form the hydrogen bonding interactions with the selected polymer poly(vinyl acetate), polyvinyl pyrrolidone (PVP), 60:40 vinyl pyrrolidone-vinyl acetate copolymer (PVP/VA 64), and poly(ethylene oxide) (PEO). 1% w/w polymer exhibited weak or no detectable effects on the glass transition temperature (Tg) of GSF. However, crystal growth rates of GSF was altered from 4.27-fold increase to 2.57-fold decrease at 8 ℃ below Tg of GSF. Interestingly, the ability to accelerate and inhibit the growth rates of GSF crystals correlated well with Tg of polymer, indicating the controlling role of segmental mobility of polymer. Moreover, ring-banded growth of GSF was observed in the polymer-doped systems. Normal compact bulk and ring-banded crystals of GSF were both characterized as the thermodynamically stable form I. More importantly, formation of ring-banded crystals of GSF can significantly weaken the inhibitory effects of polymer on the crystallization of glassy GSF.
Collapse
Affiliation(s)
- Yanan Wang
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, China
- Digital Health and Medical Advancement Impact Lab, Taylor's University, Subang Jaya, Selangor, 47500, Malaysia
| | - Chai-Yee Chin
- School of Pharmacy, Faculty of Health and Medical Science, Taylor's University, Subang Jaya, 47500, Malaysia
| | - Naveen Kumar Hawala Shivashekaregowda
- School of Pharmacy, Faculty of Health and Medical Science, Taylor's University, Subang Jaya, 47500, Malaysia.
- Digital Health and Medical Advancement Impact Lab, Taylor's University, Subang Jaya, Selangor, 47500, Malaysia.
| | - Qin Shi
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, China.
| |
Collapse
|
2
|
Lightowler M, Li S, Ou X, Cho J, Liu B, Li A, Hofer G, Xu J, Yang T, Zou X, Lu M, Xu H. Phase Identification and Discovery of an Elusive Polymorph of Drug-Polymer Inclusion Complex Using Automated 3D Electron Diffraction. Angew Chem Int Ed Engl 2024; 63:e202317695. [PMID: 38380831 DOI: 10.1002/anie.202317695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/16/2024] [Accepted: 02/17/2024] [Indexed: 02/22/2024]
Abstract
3D electron diffraction (3D ED) has shown great potential in crystal structure determination in materials, small organic molecules, and macromolecules. In this work, an automated, low-dose and low-bias 3D ED protocol has been implemented to identify six phases from a multiple-phase melt-crystallisation product of an active pharmaceutical ingredient, griseofulvin (GSF). Batch data collection under low-dose conditions using a widely available commercial software was combined with automated data analysis to collect and process over 230 datasets in three days. Accurate unit cell parameters obtained from 3D ED data allowed direct phase identification of GSF Forms III, I and the known GSF inclusion complex (IC) with polyethylene glycol (PEG) (GSF-PEG IC-I), as well as three minor phases, namely GSF Forms II, V and an elusive new phase, GSF-PEG IC-II. Their structures were then directly determined by 3D ED. Furthermore, we reveal how the stabilities of the two GSF-PEG IC polymorphs are closely related to their crystal structures. These results demonstrate the power of automated 3D ED for accurate phase identification and direct structure determination of complex, beam-sensitive crystallisation products, which is significant for drug development where solid form screening is crucial for the overall efficacy of the drug product.
Collapse
Affiliation(s)
- Molly Lightowler
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Shuting Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Xiao Ou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Jungyoun Cho
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Binbin Liu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Ao Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Gerhard Hofer
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Jiaoyan Xu
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Taimin Yang
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Xiaodong Zou
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| | - Ming Lu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Hongyi Xu
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-106 91, Sweden
| |
Collapse
|
3
|
Chen A, Cai P, Peng Y, Guo M, Su Y, Cai T. The role of alkyl chain length in the melt and solution crystallization of paliperidone aliphatic prodrugs. IUCRJ 2024; 11:23-33. [PMID: 37962472 PMCID: PMC10833388 DOI: 10.1107/s2052252523009582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 11/02/2023] [Indexed: 11/15/2023]
Abstract
Fatty acid-derivative prodrugs have been utilized extensively to improve the physicochemical, biopharmaceutical and pharmacokinetic properties of active pharmaceutical ingredients. However, to our knowledge, the crystallization behavior of prodrugs modified with different fatty acids has not been explored. In the present work, a series of paliperidone aliphatic prodrugs with alkyl chain lengths ranging from C4 to C16 was investigated with respect to crystal structure, crystal morphology and crystallization kinetics. The paliperidone derivatives exhibited isostructural crystal packing, despite the different alkyl chain lengths, and crystallized with the dominant (100) face in both melt and solution. The rate of crystallization for paliperidone derivatives in the melt increases with alkyl chain length owing to greater molecular mobility. In contrast, the longer chains prolong the nucleation induction time and reduce the crystal growth kinetics in solution. The results show a correlation between difficulty of nucleation in solution and the interfacial energy. This work provides insight into the crystallization behavior of paliperidone aliphatic prodrugs and reveals that the role of alkyl chain length in the crystallization behavior has a strong dependence on the crystallization method.
Collapse
Affiliation(s)
- An Chen
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| | - Peishan Cai
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| | - Yayun Peng
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| | - Minshan Guo
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| | - Yuan Su
- Department of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| | - Ting Cai
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
- Department of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing 211198, People’s Republic of China
| |
Collapse
|
4
|
Zhuo X, Foderà V, Larsson P, Schaal Z, Bergström CAS, Löbmann K, Kabedev A. Analysis of stabilization mechanisms in β-lactoglobulin-based amorphous solid dispersions by experimental and computational approaches. Eur J Pharm Sci 2024; 192:106639. [PMID: 37967658 DOI: 10.1016/j.ejps.2023.106639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 11/09/2023] [Accepted: 11/11/2023] [Indexed: 11/17/2023]
Abstract
Our previous work shows that β-lactoglobulin-stabilized amorphous solid dispersion (ASD) loaded with 70 % indomethacin remains stable for more than 12 months. The stability is probably due to hydrogen bond networks spread throughout the ASD, facilitated by the indomethacin which has both hydrogen donors and acceptors. To investigate the stabilization mechanisms further, here we tested five other drug molecules, including two without any hydrogen bond donors. A combination of experimental techniques (differential scanning calorimetry, X-ray power diffraction) and molecular dynamics simulations was used to find the maximum drug loadings for ASDs with furosemide, griseofulvin, ibuprofen, ketoconazole and rifaximin. This approach revealed the underlying stabilization factors and the capacity of computer simulations to predict ASD stability. We searched the ASD models for crystalline patterns, and analyzed diffusivity of the drug molecules and hydrogen bond formation. ASDs loaded with rifaximin and ketoconazole remained stable for at least 12 months, even at 90 % drug loading, whereas stable drug loadings for furosemide, griseofulvin and ibuprofen were at a maximum of 70, 50 and 40 %, respectively. Steric confinement and hydrogen bonding to the proteins were the most important stabilization mechanisms at low drug loadings (≤ 40 %). Inter-drug hydrogen bond networks (including those with induced donors), ionic interactions, and a high Tg of the drug molecule were additional factors stabilizing the ASDs at drug loading greater than 40 %.
Collapse
Affiliation(s)
- Xuezhi Zhuo
- Department of Pharmacy, University of Copenhagen, Copenhagen 2100, Denmark
| | - Vito Foderà
- Department of Pharmacy, University of Copenhagen, Copenhagen 2100, Denmark
| | - Per Larsson
- Department of Pharmacy, Uppsala University, Uppsala 75123, Sweden
| | - Zarah Schaal
- Department of Pharmacy, University of Copenhagen, Copenhagen 2100, Denmark
| | | | - Korbinian Löbmann
- Department of Pharmacy, University of Copenhagen, Copenhagen 2100, Denmark; Zerion Pharma A/S, Birkerød 3460, Denmark
| | - Aleksei Kabedev
- Department of Pharmacy, Uppsala University, Uppsala 75123, Sweden.
| |
Collapse
|
5
|
Dai D, Cao B, Hao XL, Yu ZW. Transition Mechanism from the Metastable Two-Dimensional Gel to the Stable Three-Dimensional Crystal of Imidazolium-Based Ionic Liquids. J Phys Chem B 2023; 127:7323-7333. [PMID: 37560895 DOI: 10.1021/acs.jpcb.3c02720] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
One important quest for making high quality materials with amphiphiles is to understand how a disordered self-assembly changes to a stable crystalline state. Herein, we addressed the basic question by investigating the phase transition mechanism of imidazolium-based ionic liquid (IL) [C16mim]Br, using time-resolved small- and wide-angle X-ray scattering (SAXS-WAXS), differential scanning calorimetry, and Fourier transform infrared spectroscopy techniques. Totally, a hexagonal phase, two lamellar-gel phases, and three lamellar-crystalline phases were observed, showing the special polymorphism of the system. It was demonstrated that at low concentrations the two-dimensional gel phase (Lβ1) transforms into the most stable lamellar-crystal phase (Lc3) through two intermediate crystalline phases Lc1 and Lc2. At high concentrations, the Lβ1 phase changes to a condensed lamellar gel phase (Lβ2) before changing to Lc2 and eventually to Lc3. Comparative studies using [C16mim]Cl and [C16mim]NO3 unveiled that the interactions between the counterions and the headgroups of the IL, as well as the dehydration process, govern the nucleation process of Lc3 and thus the formation of the crystal. The in-depth investigation on the transition mechanism and the phase polymorphism in the present work advances our understanding of the crystallization of amphiphilic ionic liquids in dispersions and would promote future applications.
Collapse
Affiliation(s)
- Dong Dai
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Bobo Cao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Xiao-Lei Hao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Zhi-Wu Yu
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| |
Collapse
|
6
|
Li S, Liu B, Chen Z, Ou X, Rong H, Lu M. Ritonavir Revisited: Melt Crystallization Can Easily Find the Late-Appearing Polymorph II and Unexpectedly Discover a New Polymorph III. Mol Pharm 2023; 20:3854-3863. [PMID: 37450774 DOI: 10.1021/acs.molpharmaceut.2c00994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Identification of a thermodynamically stable polymorph is an important step in the early stage of drug development. Ritonavir (RIT) is a well-known case where the most stable polymorph II emerged after being marketed, leading to a loss of $250 million. Herein, we report the findings that routine melt crystallization can reveal the late-appearing polymorph II of RIT at small supercooling, but the probability of nucleation is very low. The addition of 30-50% polyethylene glycol (PEG) promotes the crystallization of Form II as the only phase at low supercooling, making it easier to detect in polymorphism screening. During the course of our research, a new polymorph, denoted Form III, was unexpectedly discovered, crystallizing as the major phase from neat RIT melts. Single crystals of Form III were grown from melt microdroplets. Benefiting from the ability of synchrotron radiation to detect weak diffraction signals that cannot be accessible by a laboratory diffractometer, a reasonable structure of Form III was solved with slight disorder relative to thiazole groups (P1 space group and Z' = 4). The thermodynamic stability ranking of the three true polymorphs is Form II > Form I > Form III, as opposed to the order of solubility. The capacity to efficiently reveal rich polymorphs, especially the kinetically hindered polymorph, and rapidly grow single crystals of a new phase for structure determination together highlights the necessity of incorporating melt crystallization into routine methods for pharmaceutical polymorphism screening.
Collapse
Affiliation(s)
- Shuting Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Binbin Liu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Ziqiao Chen
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Xiao Ou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Haowei Rong
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Ming Lu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| |
Collapse
|
7
|
Yuan K, Huang R, Gong K, Xiao Z, Chen J, Cai S, Shen J, Xiong Z, Lin Z. Smartphone-based hand-held polarized light microscope for on-site pharmaceutical crystallinity characterization. Anal Bioanal Chem 2023:10.1007/s00216-023-04582-1. [PMID: 36786836 DOI: 10.1007/s00216-023-04582-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/22/2023] [Accepted: 01/31/2023] [Indexed: 02/15/2023]
Abstract
Polarized light microscopy (PLM) is a common but critical method for pharmaceutical crystallinity characterization, which has been widely introduced for research purposes or drug testing and is recommended by many pharmacopeias around the world. To date, crystallinity characterization of pharmaceutical solids is restricted to laboratories due to the relatively bulky design of the conventional PLM system, while little attention has been paid to on-site, portable, and low-cost applications. Herein, we developed a smartphone-based polarized microscope with an ultra-miniaturization design ("hand-held" scale) for these purposes. The compact system consists of an optical lens, two polarizers, and a tailor-made platform to hold the smartphone. Analytical performance parameters including resolution, imaging quality of interference color, and imaging reproducibility were measured. In a first approach, we illustrated the suitability of the device for pharmaceutical crystallinity characterization and obtained high-quality birefringence images comparable to a conventional PLM system, and we also showed the great promise of the device for on-site characterization with high flexibility. In a second approach, we employed the device as a proof of concept for a wider application ranging from liquid crystal to environmental pollutants or tissues from plants. As such, this smartphone-based hand-held polarized light microscope shows great potential in helping pharmacists both for research purposes and on-site drug testing, not to mention its broad application prospects in many other fields.
Collapse
Affiliation(s)
- Kaisong Yuan
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China.
| | - Rui Huang
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Kaishuo Gong
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Ziyi Xiao
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Jialin Chen
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Siyao Cai
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Jiayi Shen
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Zuer Xiong
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China
| | - Zhexuan Lin
- Bio-Analytical Laboratory, Shantou University Medical College, No. 22, Xinling Road, Shantou, 515041, China.
| |
Collapse
|
8
|
Chen A, Cai P, Luo M, Guo M, Cai T. Melt Crystallization of Celecoxib-Carbamazepine Cocrystals with the Synchronized Release of Drugs. Pharm Res 2023; 40:567-577. [PMID: 36348133 DOI: 10.1007/s11095-022-03427-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 10/28/2022] [Indexed: 11/10/2022]
Abstract
PURPOSE The fixed-dose combination drug products have been increasingly used to treat some complex diseases. A cocrystal containing two therapeutic components, named as a drug-drug cocrystal, is an ideal solid form to formulate as a fixed-dose combination product. The aim of the study is to prepare celecoxib-carbamazepine (CEL-CBZ) cocrystals by melt crystallization to achieve the synchronized release of drugs. METHOD The crystal structure of the CEL-CBZ cocrystal was determined from the cocrystals harvested from melt by single crystal X-ray diffraction. The binary phase diagram and crystal growth kinetics of the CEL-CBZ cocrystal from melt were studied to optimize the process parameters of hot-melt extrusion for manufacturing large-scale cocrystals. The intrinsic dissolution rate studies were conducted to compare the dissolution profiles of drugs in the cocrystal and their individual forms. RESULT The CEL-CBZ cocrystal crystallized in the triclinic space group with one CEL and one CBZ molecule in the asymmetric unit. The crystallization of CEL-CBZ cocrystals were observed both in the supercooled liquid and glassy state. The formation of drug-drug cocrystals significantly alter the intrinsic dissolution rates of the parent drugs to favor the synchronized release. CONCLUSION Melt crystallization is an alternative, efficient and eco-friendly approach for preparing drug-drug cocrystals on a large scale. The synchronized drug release by drug-drug cocrystals can be used to modulate the release profiles of parent drugs in the fixed-dose combination products.
Collapse
Affiliation(s)
- An Chen
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Peishan Cai
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Minqian Luo
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Minshan Guo
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Ting Cai
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China.
- Department of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, China.
| |
Collapse
|
9
|
Li S, Lightowler M, Ou X, Huang S, Jiang Y, Li X, Zou X, Xu H, Lu M. Direct structure determination of vemurafenib polymorphism from compact spherulites using 3D electron diffraction. Commun Chem 2023; 6:18. [PMID: 36697943 PMCID: PMC9871043 DOI: 10.1038/s42004-022-00804-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 12/22/2022] [Indexed: 01/25/2023] Open
Abstract
The spherulitic morphology is considered to be the most common morphology of crystalline materials and is particularly apparent in melt-crystallized products. Yet, historically, the polycrystalline nature of spherulites has hindered successful crystal structure determination. Here, we report the direct structure determination of a clinical drug, vemurafenib (VMN), in compact spherulite form using 3D electron diffraction (3D ED). VMN has four known polymorphs. We first solved the crystal structures of α-, β-, and γ-VMN from compact spherulites using 3D ED, and the resulting structures were highly consistent with those obtained by single-crystal X-ray diffraction. We then determined the crystal structure of δ-VMN-the least stable polymorph which cannot be cultivated as a single crystal-directly from the compact spherulite sample. We unexpectedly discovered a new polymorph during our studies, denoted as ε-VMN. Single crystals of ε-VMN are extremely thin and not suitable for study by X-ray diffraction. Again, we determined the structure of ε-VMN in a compact spherulite form. This successful structure elucidation of all five VMN polymorphs demonstrates the possibility of directly determining structures from melt-grown compact spherulite samples. Thereby, this discovery will improve the efficiency and broaden the scope of polymorphism research, especially within the field of melt crystallization.
Collapse
Affiliation(s)
- Shuting Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Molly Lightowler
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
| | - Xiao Ou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Siyong Huang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yifan Jiang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xizhen Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xiaodong Zou
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
| | - Hongyi Xu
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden.
| | - Ming Lu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China.
| |
Collapse
|
10
|
Zhang J, Liu M, Xu M, Chen Z, Peng X, Yang Q, Cai T, Zeng Z. Discovery of a new polymorph of clotrimazole through melt crystallization: Understanding nucleation and growth kinetics. J Chem Phys 2023; 158:034503. [PMID: 36681648 DOI: 10.1063/5.0130600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Clotrimazole (CMZ) is a classical antifungal drug for studying crystallization. In this study, a new CMZ polymorph (Form 2) was discovered during the process of nucleation and growth rate determination in the melt. High-quality single crystals were grown from melt microdroplets to determine the crystal structure by x-ray diffraction. Form 2 is metastable and exhibits a disordered structure. The crystal nucleation and growth kinetics of the two CMZ polymorphs were systematically measured. Form 2 nucleates and grows faster than the existing form (Form 1). The maximum nucleation rate of Forms 1 and 2 was observed at 50 °C (1.07 Tg). The summary of the maximum nucleation rate temperature of CMZ and the other six organic compounds indicates that nucleation near Tg in the supercooled liquid is a useful approach to discovering new polymorphs. This study is relevant for the discovering new drug polymorphs through an understanding of nucleation and growth kinetics during melt crystallization.
Collapse
Affiliation(s)
- Jie Zhang
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Minzhuo Liu
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Meixia Xu
- Yantai Key Laboratory of Nanomedicine and Advanced Preparations, Yantai Institute of Materia Medica, Shandong 264000, China
| | - Zhiguo Chen
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Xucong Peng
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Qiusheng Yang
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Ting Cai
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Zhihong Zeng
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| |
Collapse
|
11
|
Saha BK, Nath NK, Thakuria R. Polymorphs with Remarkably Distinct Physical and/or Chemical Properties. CHEM REC 2023; 23:e202200173. [PMID: 36166697 DOI: 10.1002/tcr.202200173] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 08/30/2022] [Indexed: 01/21/2023]
Abstract
Polymorphism in crystals is known since 1822 and the credit goes to Mitscherlich who realized the existence of different crystal structures of the same compound while working with some arsenate and phosphate salts. Later on, this phenomenon was observed also in organic crystals. With the advent of different technologies, especially the easy availability of single crystal XRD instruments, polymorphism in crystals has become a common phenomenon. Almost 37 % of compounds (single component) are polymorphic to date. As the energies of the different polymorphic forms are very close to each other, small changes in crystallization conditions might lead to different polymorphic structures. As a result, sometimes it is difficult to control polymorphism. For this reason, it is considered to be a nuisance to crystal engineering. It has been realized that the property of a material depends not only on the molecular structure but also on its crystal structure. Therefore, it is not only of interest to academia but also has widespread applications in the materials science as well as pharmaceutical industries. In this review, we have discussed polymorphism which causes significant changes in materials properties in different fields of solid-state science, such as electrical, magnetic, SHG, thermal expansion, mechanical, luminescence, color, and pharmaceutical. Therefore, this review will interest researchers from supramolecular chemistry, materials science as well as medicinal chemistry.
Collapse
Affiliation(s)
- Binoy K Saha
- Department of Chemistry, Pondicherry University, Puducherry, 605014, India
| | - Naba K Nath
- Department of Chemistry, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
| | - Ranjit Thakuria
- Department of Chemistry, Gauhati University, Guwahati, 781014, India
| |
Collapse
|
12
|
Zhang J, Liu M, Zeng Z. The antisolvent coprecipitation method for enhanced bioavailability of poorly water-soluble drugs. Int J Pharm 2022; 626:122043. [PMID: 35902056 DOI: 10.1016/j.ijpharm.2022.122043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 07/13/2022] [Accepted: 07/18/2022] [Indexed: 11/25/2022]
Abstract
In recent years, poorly water-soluble drug candidates in the drug development pipeline have been a challenging issue for the pharmaceutical industry. Many delivery systems such as nanocrystals, cocrystals, nanoparticles, and amorphous solid dispersions (ASDs) have been developed to overcome these problems. A large number of methods are utilized to realize the above delivery systems. Among all the preparation methods, the antisolvent coprecipitation method is a relatively simple, cost-effective method, offering many advantages over conventional methods. An overview of recent developments for each solubility enhancement approach using the antisolvent coprecipitation method is presented. This current review details a comprehensive overview of the antisolvent coprecipitation process and its properties, as well as the fundamentals for enhancing the solubility and bioavailability of poorly water-soluble drugs by nanotization, polymorph control with polymers and/or surfactants. Furthermore, this review also presents insights into the factors affecting the antisolvent coprecipitation process.
Collapse
Affiliation(s)
- Jie Zhang
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China; Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China.
| | - Minzhuo Liu
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China
| | - Zhihong Zeng
- College of Biological and Chemical Engineering, Changsha University, Changsha 410022, China.
| |
Collapse
|
13
|
França MT, Martins Marcos T, Costa PF, Bazzo GC, Nicolay Pereira R, Gerola AP, Stulzer HK. Eutectic mixture and amorphous solid dispersion: Two different supersaturating drug delivery system strategies to improve griseofulvin release using saccharin. Int J Pharm 2022; 615:121498. [DOI: 10.1016/j.ijpharm.2022.121498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/06/2022] [Accepted: 01/17/2022] [Indexed: 12/23/2022]
|
14
|
Recent advances in drug polymorphs: Aspects of pharmaceutical properties and selective crystallization. Int J Pharm 2022; 611:121320. [PMID: 34843866 DOI: 10.1016/j.ijpharm.2021.121320] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 11/02/2021] [Accepted: 11/23/2021] [Indexed: 12/27/2022]
Abstract
Drug polymorphism, an established term used to describe the phenomenon that a drug can exist in different crystalline phases, has attracted great interests in pharmaceutical field in consideration of its important role in affecting the pharmaceutical performance of oral formulations. This paper presents an overview of recent advances in the research on polymorphic drug systems including understandings on nucleation, crystal growth, dissolution, mechanical properties, polymorphic transformation, etc. Moreover, new strategies and mechanisms in the control of polymorphic forms are also highlighted in this review. Furthermore, challenges and trends in the development of polymorphic drugs are briefly discussed, aiming at developing effective and efficient pharmaceutical formulations containing the polymorphic drugs.
Collapse
|
15
|
Shen L, Dang M. Recent Advance of Melt Crystallization, Towards Process Intensification and Techniques Development. CrystEngComm 2022. [DOI: 10.1039/d2ce00022a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Melt crystallization has been considered as a green separation technique and widely applied in industry and manufacture due to several attractive features, including no need for solvent, achieving specific product...
Collapse
|
16
|
Jia S, Yang P, Gao Z, Li Z, Fang C, Gong J. Recent Progress of Antisolvent Crystallization. CrystEngComm 2022. [DOI: 10.1039/d2ce00059h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Antisolvent crystallization is a significant unit operation in the pharmaceutical industry, especially on drug crystal properties optimization. This paper firstly highlights the applications of antisolvent crystallization in crystal engineering. Antisolvent...
Collapse
|
17
|
Liu Q, Li M, Liu C, Yin J, Zhu X, Chen D. Continuous Synthesis of Polymer-Coated Drug Nanoparticles by Heterogeneous Nucleation in a Hollow-Fiber Membrane Module. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiuhong Liu
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| | - Mao Li
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| | - Chen Liu
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| | - Jieli Yin
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| | - Xuan Zhu
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| | - Dengyue Chen
- School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China
| |
Collapse
|
18
|
Jia S, Gao Z, Tian N, Li Z, Gong J, Wang J, Rohani S. Review of melt crystallization in the pharmaceutical field, towards crystal engineering and continuous process development. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2020.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
19
|
Abstract
The second and third crystalline forms of lactic acid are described, yet along with the known structure, they together fail to reproduce any of the supramolecular aggregates that have long been observed in isotropic media.
Collapse
Affiliation(s)
| | - Chunhua T. Hu
- Department of Chemistry
- New York University
- New York
- USA
| | - Ethan Reiter
- Department of Chemistry
- New York University
- New York
- USA
| | - Bart Kahr
- Department of Chemistry
- New York University
- New York
- USA
| |
Collapse
|
20
|
Xu K, Bai J, Li QL, Zhao S. Polymorphs and Amorphous State of Glipizide: Preparation and Solid-State Transformations. J Pharm Sci 2020; 110:1718-1726. [PMID: 33160976 DOI: 10.1016/j.xphs.2020.10.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 11/16/2022]
Abstract
The solid-state diversity of active pharmaceutical ingredients can provide theoretical guidance for the production and storage of drugs. In this study, three solid forms of glipizide were obtained through various methods, and the solid-state transformations were extensively investigated. Form I could be prepared using evaporative crystallization, cooling crystallization, anti-solvent crystallization, and solvent-mediated slurry conversion experiments (SSCE). Form II was produced by milling. Form III was obtained by milling and SSCE. The results of solid-state transformations indicated that Form I transformed to II during neat milling at 25 °C. In contrast, solvent inhibited the solid-state transformations of Form I under liquid-assisted milling. Forms II and III remained invariable under neat milling at 25 °C, and solid-state transformation of Form III also did not occur in the liquid-assisted milling. In SSCE, the solvent's nature and its temperature significantly influenced the solid-state conversion of amorphous glipizide. Form II converted to either Form I or III in water above 50 °C, and only transformed into Form I at 25 °C. However, the solid-state transformation did not occur when pure Form I or III was stirred in water. Form II also converted to Form I in the organic solvents SSCE at different temperatures.
Collapse
Affiliation(s)
- Kailin Xu
- School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou 510006, China
| | - Jie Bai
- Analysis and Test Center, Guangdong University of Technology, Guangzhou 510006, China
| | - Qing-Lan Li
- School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou 510006, China.
| | - Suqing Zhao
- School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou 510006, China.
| |
Collapse
|
21
|
Zhang J, Shi Q, Guo M, Liu Z, Cai T. Melt Crystallization of Indomethacin Polymorphs in the Presence of Poly(ethylene oxide): Selective Enrichment of the Polymer at the Crystal–Liquid Interface. Mol Pharm 2020; 17:2064-2071. [DOI: 10.1021/acs.molpharmaceut.0c00220] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jie Zhang
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Qin Shi
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Minshan Guo
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Zhengyu Liu
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Ting Cai
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| |
Collapse
|
22
|
Li K, Gbabode G, Barrio M, Tamarit JL, Vergé-Depré M, Robert B, Rietveld IB. The phase relationship between the pyrazinamide polymorphs α and γ. Int J Pharm 2020; 580:119230. [DOI: 10.1016/j.ijpharm.2020.119230] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 03/10/2020] [Accepted: 03/13/2020] [Indexed: 10/24/2022]
|
23
|
Continuous synthesis of drug nanocrystals by solid hollow fiber cooling crystallization. Int J Pharm 2020; 576:118978. [PMID: 31870959 DOI: 10.1016/j.ijpharm.2019.118978] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 12/11/2019] [Accepted: 12/16/2019] [Indexed: 11/21/2022]
Abstract
Size reduction of drug with poor water solubility to nanoscale is an effective way to help improve the efficacy of drug delivery to the human body. A solid hollow fiber cooling crystallization technique has been adopted to continuously produce griseofulvin drug nanoparticles under modest conditions with accurate controllability. In the solid hollow fiber cooling crystallization device, drug solution flowed through the bores of solid hollow fibers while the cooling liquid was circulated counter-currently in the shell side of the device to cool down the drug solution in the tube side. Due to intense heat exchange between the cooling liquid and the drug solution through the thin fiber walls, the temperature of drug solution decreased rapidly so that drug nanoparticles were precipitated out from the solution by sudden reduction of solubility. Through variation of the experimental conditions and parameters, the mean size of the produced nanoparticles was regulated and controlled. The nanoparticles were dispersed uniformly, the chemical structure and bonds of prepared nanoparticles was the same with as-received griseofulvin. Both raw material and NPs the polymorph(s) present form I, the melting point was 220 °C. Drug dissolution testing was also executed to verify that nanocrystals have a higher dissolution profile.
Collapse
|
24
|
Could the small molecules such as amino acids improve aqueous solubility and stabilize amorphous systems containing Griseofulvin? Eur J Pharm Sci 2020; 143:105178. [DOI: 10.1016/j.ejps.2019.105178] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 11/25/2019] [Accepted: 12/04/2019] [Indexed: 12/21/2022]
|
25
|
Bhattacharya S. Thermal expansion and dimensionality of a hydrogen bond network: a case study on dimorphic oxalic acid. CrystEngComm 2020. [DOI: 10.1039/d0ce01080d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Between 156 K–298 K the oxalic acid polymorphs, α-C2 and β-C2 exhibit comparable volumetric thermal expansions which are correlated to the respective crystal packing and intermolecular interactions in the two forms.
Collapse
|
26
|
Ou X, Li X, Rong H, Yu L, Lu M. A general method for cultivating single crystals from melt microdroplets. Chem Commun (Camb) 2020; 56:9950-9953. [DOI: 10.1039/d0cc03157g] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Here, we report a general strategy for rapidly cultivating single crystals from melt microdroplets within tens of minutes at the microgram scale.
Collapse
Affiliation(s)
- Xiao Ou
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou
- China
| | - Xizhen Li
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou
- China
| | - Haowei Rong
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou
- China
| | - Lian Yu
- School of Pharmacy
- University of Wisconsin – Madison
- Madison
- USA
| | - Ming Lu
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou
- China
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation
| |
Collapse
|
27
|
Solid-liquid phase equilibrium and thermodynamic analysis of griseofulvin in twelve mono-solvents. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111861] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
28
|
Zhao S, Ma Y, Tang W. Thermodynamic analysis and molecular dynamic simulation of solid-liquid phase equilibrium of griseofulvin in three binary solvent systems. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111600] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
29
|
Tu W, Knapik-Kowalczuk J, Chmiel K, Paluch M. Glass Transition Dynamics and Physical Stability of Amorphous Griseofulvin in Binary Mixtures with Low- Tg Excipients. Mol Pharm 2019; 16:3626-3635. [PMID: 31287704 DOI: 10.1021/acs.molpharmaceut.9b00476] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Amorphization of drug formulations containing active pharmaceutical ingredients (APIs) and excipients has been proven to be an effective strategy to improve their poor aqueous solubility. The excipients can also impact the physical stability of the prepared amorphous forms. Generally, researchers are more apt to select excipients that have high values of glass transition temperature (Tg) because of the antiplasticization effect of the additives on APIs. In this article, we studied the glass transition dynamics as well as crystallization behavior in binary blends composed of griseofulvin (GSF) and two low-Tg additives, octaacetylmaltose (acMAL) and polyvinyl acetate (PVAc), with a particular focus on the plasticization effect. Effectively suppressed crystallization of GSF is observed in both systems when higher excipient contents are used. Our finding aims to encourage the use of specifically developed protocols in which suitable plasticizers are used as excipients for stabilizing the amorphous state of a drug.
Collapse
Affiliation(s)
- Wenkang Tu
- Institute of Physics , University of Silesia , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland.,SMCEBI , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland
| | - Justyna Knapik-Kowalczuk
- Institute of Physics , University of Silesia , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland.,SMCEBI , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland
| | - Krzysztof Chmiel
- Institute of Physics , University of Silesia , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland.,SMCEBI , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland
| | - Marian Paluch
- Institute of Physics , University of Silesia , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland.,SMCEBI , 75 Pułku Piechoty 1a , 41-500 Chorzow , Poland
| |
Collapse
|
30
|
Luo Y, Chen S, Zhou J, Chen J, Tian L, Gao W, Zhang Y, Ma A, Li L, Zhou Z. Luteolin cocrystals: Characterization, evaluation of solubility, oral bioavailability and theoretical calculation. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.02.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
Nyman J, Yu L, Reutzel-Edens SM. Accuracy and reproducibility in crystal structure prediction: the curious case of ROY. CrystEngComm 2019. [DOI: 10.1039/c8ce01902a] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Because of excessive electron delocalization, the polymorphs of ROY constitute a surprisingly challenging system for crystal structure prediction.
Collapse
Affiliation(s)
- Jonas Nyman
- School of Pharmacy
- University of Wisconsin – Madison
- Madison
- USA
- Small Molecule Design & Development
| | - Lian Yu
- School of Pharmacy
- University of Wisconsin – Madison
- Madison
- USA
| | | |
Collapse
|
32
|
Ho DM, Zdilla MJ. The solid-state conformation of the topical antifungal agent O-naphthalen-2-yl N-methyl-N-(3-methylphenyl)carbamothioate. Acta Crystallogr C Struct Chem 2018; 74:1495-1501. [PMID: 30398206 PMCID: PMC6218884 DOI: 10.1107/s2053229618013591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 09/24/2018] [Indexed: 11/10/2022] Open
Abstract
Tolnaftate, a classic antifungal compound, has been found to crystallize from 1:1 (v/v) acetone-water as large flat colorless needles in the centrosymmetric monoclinic space group P21/c. These crystals contain a 50:50 mixture of the (+ap,-sp,+ac,-ac) and (-ap,+sp,-ac,+ac) conformers. The bond lengths in the central CNOS unit are 1.3444 (19), 1.3556 (18) and 1.6567 (15) Å for C-N, C-O and C-S, respectively, and the CNOS and C3N moieties are flat and nearly coplanar with each other, consistent with the C-N bond possessing partial double-bond character. Tolnaftate and the four most closely related N,N-disubstituted thiocarbamates in the Cambridge Structural Database (CSD) all exist as E-conformational isomers in the solid state. Among these five compounds, tolnaftate is the only one in which the N-tolyl moiety is positioned trans to the S atom, i.e. the N-aryl substituent in each of the other compounds is positioned cis to their respective S atom. Notably, and more importantly, our experimental X-ray structure is unlike all prior theoretical models available for tolnaftate. The implication, either directly or indirectly, is that some of those theoretical models used in earlier studies to explain the spectroscopic properties of tolnaftate and to suggest which protein-ligand interactions are responsible for the binding of tolnaftate to squalene epoxidase are either inappropriate or structurally unreasonable, i.e. the results and conclusions from those prior studies are in need of critical reassessment.
Collapse
Affiliation(s)
- Douglas M. Ho
- Department of Chemistry, Temple University, 1901 N. 13th St., Philadelphia, PA 19122, USA
| | - Michael J. Zdilla
- Department of Chemistry, Temple University, 1901 N. 13th St., Philadelphia, PA 19122, USA
| |
Collapse
|