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Alves LP, Oliveira KDS, dos Santos ACG, de Melo DF, Moreira LMCDC, Oshiro Junior JA, da Silva DTC, Cavalcanti ALDM, Damasceno BPGDL. Cellulose Acetate Microparticles Synthesized from Agave sisalana Perrine for Controlled Release of Simvastatin. Polymers (Basel) 2024; 16:1898. [PMID: 39000753 PMCID: PMC11243862 DOI: 10.3390/polym16131898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 06/14/2024] [Accepted: 06/22/2024] [Indexed: 07/17/2024] Open
Abstract
Simvastatin (SIM) is widely prescribed to treat hyperlipidemia, despite its limitations, such as a short half-life and low oral bioavailability. To overcome these drawbacks, the development of a controlled-release formulation is desirable. This study aims to develop a microparticulate system based on cellulose acetate (ACT) obtained from Agave sisalana Perrine to promote a controlled SIM release. SIM-loaded microparticles (SMP) were prepared using the solvent emulsification-evaporation method. Several parameters were evaluated, including particle size, surface charge, morphology, encapsulation efficiency, thermochemical characteristics, crystallinity, and in vitro release profile. ACT exhibited favorable flow properties after acetylation, with a degree of substitution values superior to 2.5, as confirmed by both the chemical route and H-NMR, indicating the formation of cellulose triacetate. The obtained SMP were spherical with an average size ranging from 1842 to 1857 nm, a zeta potential of -4.45 mV, and a high SIM incorporation efficiency (98%). Thermal and XRD analyses revealed that SIM was homogeneously dispersed into the polymeric matrix in its amorphous state. In vitro studies using dialysis bags revealed that the controlled SIM release from microparticles was higher under simulated intestinal conditions and followed the Higuchi kinetic model. Our results suggest that ACT-based microparticles are a promising system for SIM delivery, which can improve its bioavailability, and result in better patient compliance.
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Affiliation(s)
- Larissa Pereira Alves
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Kevin da Silva Oliveira
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Ana Cláudia Gonçalves dos Santos
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Demis Ferreira de Melo
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Lívia Maria Coelho de Carvalho Moreira
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - João Augusto Oshiro Junior
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
| | - Dayanne Tomaz Casimiro da Silva
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Airlla Laana de Medeiros Cavalcanti
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
| | - Bolívar Ponciano Goulart de Lima Damasceno
- Graduate Program of Pharmaceutical Sciences, Paraíba State University, Campina Grande 58429-600, PB, Brazil; (L.P.A.); (K.d.S.O.); (D.F.d.M.); (L.M.C.d.C.M.); (J.A.O.J.); (D.T.C.d.S.); (B.P.G.d.L.D.)
- Laboratory of Development and Characterization of Pharmaceutical Products, Department of Pharmacy, Paraíba State University, Campina Grande 58429-600, PB, Brazil;
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Ragab S, Eleryan A, El Nemr A. Ferric perchlorate hydrate as a new catalyst for highly efficient esterification of cellulose at room temperature. Sci Rep 2022; 12:5643. [PMID: 35379918 PMCID: PMC8980091 DOI: 10.1038/s41598-022-09669-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/21/2022] [Indexed: 01/12/2023] Open
Abstract
Ferric perchlorate was tested for the first time as a new catalyst to accelerate the esterification of microcrystalline cellulose (MCC) at room temperature in a less amount of acetic anhydride compared to the amount used in the conventional methods. It was possible to manufacture cellulose acetate (CA) with a high yield of up to 94%. The influence of changes in reaction time, catalyst amounts, and acetic anhydride on the characterization of cellulose acetate produced was investigated. The optimum condition for esterification of 2.0 g (12.34 mmol) MCC was found to be: 10 mL (105.98 mmol) AC2O, 200 mg (0.564 mmol, anhydrous basis) of Fe(ClO4)3·xH2O and 1 h reaction time at room temperature. The substitution degree of CA was investigated by FTIR and 1H-NMR spectroscopy. Thermal stability of CA was studied using TGA, DTA and DSC analyses. The degree of polymerization and the polydispersity index (PDI) were obtained using Gel permeation chromatography (GPC). This study verified the direct and efficient synthesis of di- and tri-cellulose acetate in one-pot reaction using Fe(ClO4)3·xH2O as a catalyst without using solvent.
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Affiliation(s)
- Safaa Ragab
- grid.419615.e0000 0004 0404 7762National Institute of Oceanography and Fisheries, NIOF, Kayet Bey, El-Anfoushy, Alexandria, Egypt
| | - Ahmed Eleryan
- grid.419615.e0000 0004 0404 7762National Institute of Oceanography and Fisheries, NIOF, Kayet Bey, El-Anfoushy, Alexandria, Egypt
| | - Ahmed El Nemr
- grid.419615.e0000 0004 0404 7762National Institute of Oceanography and Fisheries, NIOF, Kayet Bey, El-Anfoushy, Alexandria, Egypt
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Fujisawa R, Iwamura T, Leproux P, Couderc V, Okada H, Kano H. Ultrabroadband Multiplex Coherent anti-Stokes Raman Scattering (CARS) Microspectroscopy Using a CCD Camera with an InGaAs Image Intensifier. CHEM LETT 2018. [DOI: 10.1246/cl.180017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rie Fujisawa
- Konicaminolta Inc., No. 1 Sakura-machi, Hino, Tokyo 191-8511, Japan
| | - Takumi Iwamura
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Philippe Leproux
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
| | - Vincent Couderc
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
| | - Hisatake Okada
- Konicaminolta Inc., No. 1 Sakura-machi, Hino, Tokyo 191-8511, Japan
| | - Hideaki Kano
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
- Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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Fujisawa R, Ohno T, Leproux P, Couderc V, Fukusaka K, Kita H, Kano H. Effect of a Waterproofing Agent on the Penetration Process of Water into a Cellulose Acetate Film by Time-resolved Coherent Anti-Stokes Raman Scattering (CARS) Microspectroscopy. CHEM LETT 2017. [DOI: 10.1246/cl.170120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rie Fujisawa
- KONICA MINOLTA Inc., 2970 Ishikawa, Hachioji, Tokyo 192-8505
| | - Tomoya Ohno
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
| | - Philippe Leproux
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
| | - Vincent Couderc
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
| | | | - Hiroshi Kita
- KONICA MINOLTA Inc., 2970 Ishikawa, Hachioji, Tokyo 192-8505
| | - Hideaki Kano
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
- Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
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Guo S, Suzuki N, Fujiki M. Oligo- and Polyfluorenes Meet Cellulose Alkyl Esters: Retention, Inversion, and Racemization of Circularly Polarized Luminescence (CPL) and Circular Dichroism (CD) via Intermolecular C–H/O═C Interactions. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02762] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sibo Guo
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama,
Ikoma, Nara 630-0192, Japan
| | - Nozomu Suzuki
- Department
of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Michiya Fujiki
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama,
Ikoma, Nara 630-0192, Japan
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Nabili A, Fattoum A, Brochier-Salon MC, Bras J, Elaloui E. Synthesis of cellulose triacetate-I from microfibrillated date seeds cellulose (Phoenix dactylifera L.). IRANIAN POLYMER JOURNAL 2017. [DOI: 10.1007/s13726-017-0505-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Fujisawa R, Ohno T, Leproux P, Couderc V, Fukusaka K, Kita H, Kano H. Effect of a Stretching Procedure on the Penetration Process of Water into a Cellulose Acetate Film by Coherent Anti-Stokes Raman Scattering (CARS) Microspectroscopy. CHEM LETT 2017. [DOI: 10.1246/cl.160765] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rie Fujisawa
- Konicaminolta Inc., 2970 Ishikawa-machi, Hachioji, Tokyo 192-8505
| | - Tomoya Ohno
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
| | - Philippe Leproux
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 avenue Albert Thomas, 87060 Limoges CEDEX, France
| | - Vincent Couderc
- Institut de Recherche XLIM, UMR CNRS No. 7252, 123 avenue Albert Thomas, 87060 Limoges CEDEX, France
| | - Kiyoshi Fukusaka
- Konicaminolta Inc., 2970 Ishikawa-machi, Hachioji, Tokyo 192-8505
| | - Hiroshi Kita
- Konicaminolta Inc., 2970 Ishikawa-machi, Hachioji, Tokyo 192-8505
| | - Hideaki Kano
- Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573
- Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571
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8
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Fujisawa R, Ohno T, Kaneyasu JF, Leproux P, Couderc V, Kita H, Kano H. Dynamical study of the water penetration process into a cellulose acetate film studied by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.05.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Wei L, McDonald AG, Stark NM. Grafting of Bacterial Polyhydroxybutyrate (PHB) onto Cellulose via In Situ Reactive Extrusion with Dicumyl Peroxide. Biomacromolecules 2015; 16:1040-9. [DOI: 10.1021/acs.biomac.5b00049] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Liqing Wei
- Renewable
Materials Program, Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, Idaho 83844-1132, United States
| | - Armando G. McDonald
- Renewable
Materials Program, Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, Idaho 83844-1132, United States
| | - Nicole M. Stark
- U.S. Department of Agriculture, Forest Service,
Forest Products Laboratory, One Gifford Pinchot Drive, Madison, Wisconsin 53726-2398, United States
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Kobayashi T, Hayakawa D, Khishigjargal T, Ueda K. Investigation of the structure and interaction of cellulose triacetate I crystal using ab initio calculations. Carbohydr Res 2014; 388:61-6. [DOI: 10.1016/j.carres.2014.02.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 02/10/2014] [Accepted: 02/11/2014] [Indexed: 10/25/2022]
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11
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12
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Zhang K, Brendler E, Gebauer K, Gruner M, Fischer S. Synthesis and characterization of low sulfoethylated cellulose. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2010.08.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Zhang K, Brendler E, Geissler A, Fischer S. Synthesis and spectroscopic analysis of cellulose sulfates with regulable total degrees of substitution and sulfation patterns via 13C NMR and FT Raman spectroscopy. POLYMER 2011. [DOI: 10.1016/j.polymer.2010.11.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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15
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Yoshifuji A, Noishiki Y, Wada M, Heux L, Kuga S. Esterification of β-Chitin via Intercalation by Carboxylic Anhydrides. Biomacromolecules 2006; 7:2878-81. [PMID: 17025365 DOI: 10.1021/bm060516w] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
beta-chitin is known to form intercalation complexes with aliphatic alcohols and amines. We found that it also forms complexes with carboxylic anhydrides. When the beta-chitin-acetic anhydride complex was heated to 105 degrees C, the hydroxyl groups of chitin were acetylated by a host-guest reaction, maintaining the host's crystal structure. Structures of complex and acetylated products were analyzed by X-ray diffraction, (13)C CP/MAS NMR, and infrared spectroscopy. The maximum degree of substitution (DS) was close to 1.0, suggesting regioselective esterification at the C6 position of chitin. Partially acetylated beta-chitin with a DS of 0.4 could incorporate various guest species that are difficult to be incorporated by original beta-chitin. In contrast, beta-chitin acetate with a DS of 1 lost the ability to form a complex. Intercalation complexes of beta-chitin with cyclic anhydrides (succinic and maleic) also underwent esterification by heating, and the products with a DS of approximately 1 dissolved in aqueous alkali, apparently as the result of the dissociation of introduced carboxyl groups. These phenomena are potentially useful in controlling the complexation ability of beta-chitin and the preparation of regioselectively esterified chitin derivatives.
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Affiliation(s)
- A Yoshifuji
- Department of Biomaterials Science, Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
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Sikorski P, Wada M, Heux L, Shintani H, Stokke BT. Crystal Structure of Cellulose Triacetate I. Macromolecules 2004. [DOI: 10.1021/ma0498520] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pawel Sikorski
- Department of Physics, The Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway, Department of Biomaterials Science, Graduate School of Agricultural and Life Science, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan, and Centre de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph Fourier University of Grenoble), C.N.R.S. B.P. 53, 38401, Grenoble Cedex 9, France
| | - Masahisa Wada
- Department of Physics, The Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway, Department of Biomaterials Science, Graduate School of Agricultural and Life Science, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan, and Centre de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph Fourier University of Grenoble), C.N.R.S. B.P. 53, 38401, Grenoble Cedex 9, France
| | - Laurent Heux
- Department of Physics, The Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway, Department of Biomaterials Science, Graduate School of Agricultural and Life Science, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan, and Centre de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph Fourier University of Grenoble), C.N.R.S. B.P. 53, 38401, Grenoble Cedex 9, France
| | - Hiroyuki Shintani
- Department of Physics, The Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway, Department of Biomaterials Science, Graduate School of Agricultural and Life Science, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan, and Centre de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph Fourier University of Grenoble), C.N.R.S. B.P. 53, 38401, Grenoble Cedex 9, France
| | - Bjørn T. Stokke
- Department of Physics, The Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway, Department of Biomaterials Science, Graduate School of Agricultural and Life Science, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan, and Centre de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph Fourier University of Grenoble), C.N.R.S. B.P. 53, 38401, Grenoble Cedex 9, France
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Structural analysis of cellulose triacetate polymorphs by two-dimensional solid-state 13C–13C and 1H–13C correlation NMR spectroscopies. POLYMER 2004. [DOI: 10.1016/j.polymer.2004.01.075] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Wang F, Wenslow RM, Dowling TM, Mueller KT, Santos I, Wyvratt JM. Characterization of a Thermally Induced Irreversible Conformational Transition of Amylose Tris(3,5-dimethylphenylcarbamate) Chiral Stationary Phase in Enantioseparation of Dihydropyrimidinone Acid by Quasi-Equilibrated Liquid Chromatography and Solid-State NMR. Anal Chem 2003; 75:5877-85. [PMID: 14588029 DOI: 10.1021/ac034714e] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A thermally induced irreversible conformational transition of amylose tris(3,5-dimethylphenylcarbamate) (i.e., Chiralpak AD) chiral stationary phase (CSP) in the enantioseparation of dihydropyrimidinone (DHP) acid racemate was studied for the first time by quasi-equilibrated liquid chromatography with cyclic van't Hoff and step temperature programs and solid-state ((13)C CPMAS and (19)F MAS) NMR using ethanol and trifluoroacetic acid (TFA)-modified n-hexane as the mobile phase. The conformational transition was controlled by a single kinetically driven process, as evidenced by the chromatographic studies. Solid-state NMR was used to study the effect of the temperature on the conformational change of the solvated phase (with or without the DHP acid enantiomers and TFA) and provided some viable structural information about the CSP and the enantiomers.
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Affiliation(s)
- Fang Wang
- Department of Analytical Research, Merck Research Laboratories, Merck & Co., Inc., P.O. Box 2000, RY818 B-208, Rahway, New Jersey 07065, USA.
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Kono H, Erata T, Takai M. CP/MAS (13)C NMR study of cellulose and cellulose derivatives. 2. Complete assignment of the (13)C resonance for the ring carbons of cellulose triacetate polymorphs. J Am Chem Soc 2002; 124:7512-8. [PMID: 12071761 DOI: 10.1021/ja010705g] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Complex ring (13)C resonance lines of the cross-polarization/magic angle spinning (CP/MAS) (13)C NMR spectra of cellulose triacetate (CTA) I and CTA II were completely assigned, for the first time, by (13)C-enriched CTA allomorphs. The (13)C-enriched CTA I was prepared by heterogeneous acetylation of bacterial cellulose which was biosynthesized by Acetobacter xylinum (A. xylinum) ATCC10245 from culture medium containing D-(2-(13)C)-, D-(3-(13)C)-, or D-(5-(13)C)glucose as a carbon source, while CTA II samples were obtained by solution acetylation of the (13)C-enriched bacterial celluloses. From comparison of the spectra of normal CTA prepared from ramie with those of the enriched CTA samples, it was revealed that all carbons composed of CTA I appeared as a singlet, while those of CTA II except for C1 were shown as equal-intensity doublets in the CP/MAS (13)C NMR spectrum. This finding suggests that CTA I is made up of one kind of glucopyranose residue while there are two magnetically inequivalent sites in the unit cell of CTA II in the same population.
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Affiliation(s)
- Hiroyuki Kono
- Bruker Biospin Co., Ltd., Tsukuba, Ibaraki 305-0051, Japan
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Granja PL, Pouységu L, Pétraud M, De Jéso B, Baquey C, Barbosa MA. Cellulose phosphates as biomaterials. I. Synthesis and characterization of highly phosphorylated cellulose gels. J Appl Polym Sci 2001. [DOI: 10.1002/app.2193] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wenslow RM, Wang T. Solid-state NMR characterization of amylose tris(3,5-dimethylphenylcarbamate) chiral stationary-phase structure as a function of mobile-phase composition. Anal Chem 2001; 73:4190-5. [PMID: 11569808 DOI: 10.1021/ac0103672] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Solid-state NMR (1H/13C CPMAS) was utilized to identify structural differences in amylose tris(3,5-dimethylphenylcarbamate) chiral stationary phase (Chiralpak AD), as a function of mobile-phase composition. Dry Chiralpak AD stationary phase displayed an amorphous CPMAS NMR spectrum. However, CPMAS spectra of Chiralpak AD flushed with organic mobile phases clearly displayed evidence of solvent complexes. Chiralpak AD flushed with nonpolar hexane exhibited solvent complexes with minimal structural perturbation. For Chiralpak AD flushed with hexane containing alcohol modifiers, however, solvent incorporation caused significant difference in conformation distribution as evidenced by increased resolution of 13C peaks in the CPMAS spectrum of the stationary phase. 2-Propanol modifier displayed more efficient displacement of incorporated hexane while forming relatively more distinct/ordered solvent complexes with Chiralpak AD in comparison to ethanol modifier. Reversed elution order and unusual retention behavior on Chiralpak AD as a function of mobile-phase modifier was reported earlier. These chromatographic behaviors are believed to be due to different alterations of the steric environment of the chiral cavities in the CSP by the different mobile-phase modifiers. In addition, on the basis of the chemical shift of C-1 carbon on the amylose backbone, it is possible that Chiralpak AD's structure is a helix with a number of fold less than six.
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Affiliation(s)
- R M Wenslow
- Analytical Research Department, Merck Research Laboratories, Rahway, New Jersey 07065-0900, USA
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Jandura P, Kokta BV, Riedl B. Fibrous long-chain organic acid cellulose esters and their characterization by diffuse reflectance FTIR spectroscopy, solid-state CP/MAS13C-NMR, and X-ray diffraction. J Appl Polym Sci 2000. [DOI: 10.1002/1097-4628(20001114)78:7<1354::aid-app60>3.0.co;2-v] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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