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Wagner J, Wu Z, Wang H, Xiong W. Imaging Orientation of a Single Molecular Hierarchical Self-Assembled Sheet: The Combined Power of a Vibrational Sum Frequency Generation Microscopy and Neural Network. J Phys Chem B 2022; 126:7192-7201. [PMID: 36098975 PMCID: PMC9511492 DOI: 10.1021/acs.jpcb.2c05876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 08/30/2022] [Indexed: 11/28/2022]
Abstract
In this work, we determined the tilt angles of molecular units in hierarchical self-assembled materials on a single-sheet level, which were not available previously. This was achieved by developing a fast line-scanning vibrational sum frequency generation (VSFG) hyperspectral imaging technique in combination with neural network analysis. Rapid VSFG imaging enabled polarization resolved images on a single sheet level to be measured quickly, circumventing technical challenges due to long-term optical instability. The polarization resolved hyperspectral images were then used to extract the supramolecular tilt angle of a self-assembly through a set of spectra-tilt angle relationships which were solved through neural network analysis. This unique combination of both novel techniques offers a new pathway to resolve molecular level structural information on self-assembled materials. Understanding these properties can further drive self-assembly design from a bottom-up approach for applications in biomimetic and drug delivery research.
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Affiliation(s)
- Jackson
C. Wagner
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
| | - Zishan Wu
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
| | - Haoyuan Wang
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
| | - Wei Xiong
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
- Materials
Science and Engineering Program, University
of California San Diego, La Jolla, California 92093, United States
- Department
of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093, United States
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Iwanami A, Ota M, Hidaka S, Tajima M, Onishi H, Ikeuchi-Takahashi Y. [Effect of Storage of Tulobuterol Tapes after Package Opening and Liner Peeling on Their Formulation Properties]. YAKUGAKU ZASSHI 2021; 141:949-954. [PMID: 34193654 DOI: 10.1248/yakushi.20-00250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Although tulobuterol tape is provided to patients in an inner package, information regarding the stability of the tape after opening the packaging may be requested by patients. This study was performed to generate underlying data on the storage stability after package opening or liner peeling with package opening. Tulobuterol tapes were stored at 25℃, 60% relative humidity (RH); 40℃, 75%RH; or in a refrigerator (2-4℃, 10-30%RH) for 1 day or 3 days. In a peel adhesive strength test after package opening, storage at 25℃, 60%RH had a low effect on the adhesive strength of the tape. Storage after liner peeling with package opening resulted in variable adhesive strength of the tape. Regarding drug release properties, for storage after package opening, the f2 values of tapes stored in the three different conditions were over 50, except for tapes stored at 25℃, 60%RH for 3 days. For the tapes stored at 25℃, 60%RH or 40℃, 75%RH after liner peeling with package opening, the release rate and the ratio of drug released at 24 h may be decreased because the drug content decreased due to drug sublimation. This study suggested that tulobuterol tapes can be stored after package opening at 25℃, 60%RH for 1 d.
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Affiliation(s)
- Ayumi Iwanami
- Department of Drug Delivery Research, Hoshi University
| | - Misuzu Ota
- Department of Drug Delivery Research, Hoshi University.,Juntendo Tokyo Koto Geriatric Medical Center
| | | | | | - Hiraku Onishi
- Department of Drug Delivery Research, Hoshi University
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3
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Sherman AM, Takanti N, Rong J, Simpson GJ. Nonlinear optical characterization of pharmaceutical formulations. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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4
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A Mechanistic Model for Predicting the Physical Stability of Amorphous Solid Dispersions. J Pharm Sci 2020; 110:1495-1512. [PMID: 32818440 DOI: 10.1016/j.xphs.2020.08.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/10/2020] [Accepted: 08/07/2020] [Indexed: 12/31/2022]
Abstract
In this paper, we establish a mechanistic model for the prediction of amorphous solid dispersion (ASD) stability. The novel approach incorporates fundamental physical parameters, principally supersaturation, diffusivity, and interfacial energy, to model crystallization in ASDs accounting for both kinetic and thermodynamic drivers. API dependent decoupling coefficients were also considered which allowed dynamic mechanical analysis to probe molecular mobility, with viscosity measurements, across an exceptionally broad range of temperatures to support ASD stability simulations. ASDs are multicomponent systems in which the amorphous form of active pharmaceutical ingredients (APIs) are molecularly dispersed within a carrier. This gives rise to a transiently supersaturated API solution upon dissolution which increases the driving force for oral absorption and results in increased bioavailability as compared to that of the crystalline API. A major shortcoming of ASDs, however, is that there is the potential for amorphous APIs to revert to their more stable crystalline form during storage, despite the use of polymer carriers to stabilize formulations and limit recrystallization. Hot melt extrusion (HME) has been employed as the preparation method for ASDs used in this study as it is well-suited for the formation of uniform dispersions. The ASDs were stored under controlled temperature conditions, in the absence of humidity, to determine recrystallization kinetics. Our mechanistic model, considering both crystal nucleation and growth processes, describes temporal ASD stability through a system of coupled differential equations that connect the physiochemical properties of the ASD system to drug recrystallization. The model and prolonged time scale of crystallization observed highlight the importance of considering both thermodynamic and kinetic factors in the preparation of stable ASDs. Experimental observations were found to be in good agreement with predictions of the model confirming its utility in predicting the temporal physical stability of amorphous solid dispersions through a mechanistic lens.
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Sherman AM, Geiger AC, Smith CJ, Taylor LS, Hinds J, Stroud PA, Simpson GJ. Stochastic Differential Scanning Calorimetry by Nonlinear Optical Microscopy. Anal Chem 2020; 92:1171-1178. [PMID: 31790194 DOI: 10.1021/acs.analchem.9b04300] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Stochastic phase transformations within individual crystalline particles were recorded by integration of second harmonic generation (SHG) imaging with differential scanning calorimetry (DSC). The SHG activity of a crystal is highly sensitive to the specific molecular packing arrangement within a noncentrosymmetric lattice, providing access to information otherwise unavailable by conventional imaging approaches. Consequently, lattice transformations associated with dehydration/desolvation events were readily observed by SHG imaging and directly correlated to the phase transformations detected by the DSC measurements. Following studies of a model system (urea), stochastic differential scanning calorimetry (SDSC) was performed on trehalose dihydrate, which has a more complex phase behavior. From these measurements, SDSC revealed a broad diversity of single-particle thermal trajectories and direct evidence of a "cold phase transformation" process not observable by the DSC measurements alone.
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Affiliation(s)
- Alex M Sherman
- Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States
| | - Andreas C Geiger
- Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States
| | - Casey J Smith
- Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States
| | - Lynne S Taylor
- Department of Industrial and Physical Pharmacy , Purdue University , 575 Stadium Mall Drive , West Lafayette , Indiana 47907 , United States
| | - Jeremy Hinds
- Eli Lilly & Company , 1200 W. Morris Street , Indianapolis , Indiana 46221 , United States
| | - Paul A Stroud
- Eli Lilly & Company , 1200 W. Morris Street , Indianapolis , Indiana 46221 , United States
| | - Garth J Simpson
- Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States
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Ranasinghe JC, Dikkumbura AS, Hamal P, Chen M, Khoury RA, Smith HT, Lopata K, Haber LH. Monitoring the growth dynamics of colloidal gold-silver core-shell nanoparticles using in situ second harmonic generation and extinction spectroscopy. J Chem Phys 2019; 151:224701. [PMID: 31837661 DOI: 10.1063/1.5127941] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Jeewan C. Ranasinghe
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Asela S. Dikkumbura
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Prakash Hamal
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Min Chen
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Rami A. Khoury
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Holden T. Smith
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Kenneth Lopata
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Louis H. Haber
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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Novakovic D, Isomäki A, Pleunis B, Fraser-Miller SJ, Peltonen L, Laaksonen T, Strachan CJ. Understanding Dissolution and Crystallization with Imaging: A Surface Point of View. Mol Pharm 2018; 15:5361-5373. [PMID: 30247922 PMCID: PMC6221374 DOI: 10.1021/acs.molpharmaceut.8b00840] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
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The tendency for crystallization
during storage and administration
is the most considerable hurdle for poorly water-soluble drugs formulated
in the amorphous form. There is a need to better detect often subtle
and complex surface crystallization phenomena and understand their
influence on the critical quality attribute of dissolution. In this
study, the interplay between surface crystallization of the amorphous
form during storage and dissolution testing, and its influence on
dissolution behavior, is analyzed for the first time with multimodal
nonlinear optical imaging (coherent anti-Stokes Raman scattering (CARS)
and sum frequency generation (SFG)). Complementary analyses are provided
with scanning electron microscopy, X-ray diffraction and infrared
and Raman spectroscopies. Amorphous indomethacin tablets were prepared
and subjected to two different storage conditions (30 °C/23%
RH and 30 °C/75% RH) for various durations and then dissolution
testing using a channel flow-through device. Trace levels of surface
crystallinity previously imaged with nonlinear optics after 1 or 2
days of storage did not significantly decrease dissolution and supersaturation
compared to the freshly prepared amorphous tablets while more extensive
crystallization after longer storage times did. Multimodal nonlinear
optical imaging of the tablet surfaces after 15 min of dissolution
revealed complex crystallization behavior that was affected by both
storage condition and time, with up to four crystalline polymorphs
simultaneously observed. In addition to the well-known α- and
γ-forms, the less reported metastable ε- and η-forms
were also observed, with the ε-form being widely observed in
samples that had retained significant surface amorphousness during
storage. This form was also prepared in the pure form and further
characterized. Overall, this study demonstrates the potential value
of nonlinear optical imaging, together with more established solid-state
analysis methods, to understand complex surface crystallization behavior
and its influence on drug dissolution during the development of amorphous
drugs and dosage forms.
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Affiliation(s)
- Dunja Novakovic
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy , University of Helsinki , Viikinkaari 5 E , 00014 Helsinki , Finland
| | - Antti Isomäki
- Biomedicum Imaging Unit, Faculty of Medicine , University of Helsinki , Haartmaninkatu 8 , 00014 Helsinki , Finland
| | - Bibi Pleunis
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy , University of Helsinki , Viikinkaari 5 E , 00014 Helsinki , Finland
| | - Sara J Fraser-Miller
- Dodd-Walls Center for Photonic and Quantum Technologies, Department of Chemistry , University of Otago , Dunedin 9016 , New Zealand
| | - Leena Peltonen
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy , University of Helsinki , Viikinkaari 5 E , 00014 Helsinki , Finland
| | - Timo Laaksonen
- Laboratory of Chemistry and Bioengineering , Tampere University of Technology , Korkeakoulunkatu 8 , 33720 Tampere , Finland
| | - Clare J Strachan
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy , University of Helsinki , Viikinkaari 5 E , 00014 Helsinki , Finland
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