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Jing H, Huang X, Du X, Mo L, Ma C, Wang H. Facile synthesis of pH-responsive sodium alginate/carboxymethyl chitosan hydrogel beads promoted by hydrogen bond. Carbohydr Polym 2022; 278:118993. [PMID: 34973796 DOI: 10.1016/j.carbpol.2021.118993] [Citation(s) in RCA: 81] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 12/02/2021] [Accepted: 12/05/2021] [Indexed: 12/13/2022]
Abstract
In this work, a novel synthesis strategy of sodium alginate/carboxymethyl chitosan hydrogel beads promoted by hydrogen bond was described. The beads were prepared by dropping the blends of two polymers into the citric acid solution. Besides hydrogen bonding, electrostatic interactions were also involved in the formation of the hydrogel beads. The thermal stability experiments revealed that the more the content of carboxymethyl chitosan, the better the thermal stability of the beads. The beads exhibited excellent pH sensitivity, pH reversibility, and lactoferrin loading capacity. The swelling ratio of the bead and its protein releasing profile was pH-dependent, which could prevent premature protein release in the gastric environment. Also, the circular dichroism results demonstrated that lactoferrin could maintain its structure during the loading and releasing process. The obtained results revealed that the hydrogel beads prepared in this work could be used as a potential protein carrier for oral delivery.
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Affiliation(s)
- Huijuan Jing
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Xin Huang
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Xiaojing Du
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Ling Mo
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Chaoyang Ma
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Hongxin Wang
- The State Key Laboratory of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science & Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
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Schmid MT, Sykacek E, O'Connor K, Omann M, Mundigler N, Neureiter M. Pilot scale production and evaluation of mechanical and thermal properties of P(
3HB
) from
Bacillus megaterium
cultivated on desugarized sugar beet molasses. J Appl Polym Sci 2021. [DOI: 10.1002/app.51503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Maximilian T. Schmid
- Institute of Environmental Biotechnology University of Natural Resources and Life Sciences Tulln Austria
| | - Eva Sykacek
- Institute of Natural Materials Technology University of Natural Resources and Life Sciences Tulln Austria
| | | | - Markus Omann
- AGRANA Research & Innovation Center GmbH Tulln Austria
| | - Norbert Mundigler
- Institute of Natural Materials Technology University of Natural Resources and Life Sciences Tulln Austria
| | - Markus Neureiter
- Institute of Environmental Biotechnology University of Natural Resources and Life Sciences Tulln Austria
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Lisuzzo L, Cavallaro G, Milioto S, Lazzara G. Halloysite Nanotubes Coated by Chitosan for the Controlled Release of Khellin. Polymers (Basel) 2020; 12:E1766. [PMID: 32784604 PMCID: PMC7464246 DOI: 10.3390/polym12081766] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 02/07/2023] Open
Abstract
In this work, we have developed a novel strategy to prepare hybrid nanostructures with controlled release properties towards khellin by exploiting the electrostatic interactions between chitosan and halloysite nanotubes (HNT). Firstly, khellin was loaded into the HNT lumen by the vacuum-assisted procedure. The drug confinement within the halloysite cavity has been proved by water contact angle experiments on the HNT/khellin tablets. Therefore, the loaded nanotubes were coated with chitosan as a consequence of the attractions between the cationic biopolymer and the halloysite outer surface, which is negatively charged in a wide pH range. The effect of the ionic strength of the aqueous medium on the coating efficiency of the clay nanotubes was investigated. The surface charge properties of HNT/khellin and chitosan/HNT/khellin nanomaterials were determined by ζ potential experiments, while their morphology was explored through Scanning Electron Microscopy (SEM). Water contact angle experiments were conducted to explore the influence of the chitosan coating on the hydrophilic/hydrophobic character of halloysite external surface. Thermogravimetry (TG) experiments were conducted to study the thermal behavior of the composite nanomaterials. The amounts of loaded khellin and coated chitosan in the hybrid nanostructures were estimated by a quantitative analysis of the TG curves. The release kinetics of khellin were studied in aqueous solvents at different pH conditions (acidic, neutral and basic) and the obtained data were analyzed by the Korsmeyer-Peppas model. The release properties were interpreted on the basis of the TG and ζ potential results. In conclusion, this study demonstrates that halloysite nanotubes wrapped by chitosan layers can be effective as drug delivery systems.
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Affiliation(s)
- Lorenzo Lisuzzo
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy; (L.L.); (S.M.); (G.L.)
| | - Giuseppe Cavallaro
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy; (L.L.); (S.M.); (G.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
| | - Stefana Milioto
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy; (L.L.); (S.M.); (G.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
| | - Giuseppe Lazzara
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy; (L.L.); (S.M.); (G.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
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Tondi G, Schnabel T. Bio-Based Polymers for Engineered Green Materials. Polymers (Basel) 2020; 12:polym12040775. [PMID: 32244677 PMCID: PMC7240678 DOI: 10.3390/polym12040775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 03/28/2020] [Indexed: 12/11/2022] Open
Affiliation(s)
- Gianluca Tondi
- Department of Land, Environment, Agriculture and Forestry, University of Padova, Viale dell’Università 16, 35020 Legnaro, Italy
- Correspondence: ; Tel.: +39-043-8272776
| | - Thomas Schnabel
- Forest Products Technology & Timber Constructions Department, Salzburg University of Applied Sciences, Marktstrasse 136a, 5431 Kuchl, Austria;
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Tian Y, Feng X, Zhang Y, Yu Q, Wang X, Tian M. Determination of Volatile Water Pollutants Using Cross-Linked Polymeric Ionic Liquid as Solid Phase Micro-Extraction Coatings. Polymers (Basel) 2020; 12:polym12020292. [PMID: 32024255 PMCID: PMC7077427 DOI: 10.3390/polym12020292] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 01/25/2020] [Accepted: 01/26/2020] [Indexed: 11/25/2022] Open
Abstract
Ionic liquids found a wide application in catalysis and extraction due to their unique properties. Herein, ethylene glycol dimethacrylate as the cross-linker and 1-vinyl-3- butylimidazolium tetrafluoroborate as functional monomer via thermally initiated free-radical polymerization was prepared as a novel copolymer solid phase micro-extraction (SPME) coating. A surface modified stainless-steel wire was implemented as the substrate. Factors affecting the extraction performances of the copolymer, including the molar ratio of monomers to cross-linkers, the amount of porogen agent, and polymerization time were evaluated and optimized. To evaluate the extraction performance, five commonly seen polycyclic aromatic hydrocarbons (PAHs) were taken as the analytical targets. The potential factors affecting extraction efficiency were optimized. The as-prepared SPME device, coupled with gas chromatography, was successfully applied for the determination of PAHs in water samples. The wide linear range, low detection limit, good reproducibility, selectivity, and excellent thermal stability indicate the promising application of the newly developed SPME fiber in environmental monitoring as well as in other samples having complex matrices.
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Affiliation(s)
- Yuan Tian
- Division of Advanced Manufacturing, Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China;
| | - Xilan Feng
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China; (X.F.); (Y.Z.); (M.T.)
| | - Yuping Zhang
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China; (X.F.); (Y.Z.); (M.T.)
| | - Quan Yu
- Division of Advanced Manufacturing, Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China;
- Correspondence: (Q.Y.); (X.W.); Tel.: +86-755-2603-5201 (Q.Y.); +86-755-2603-6618 (X.W.)
| | - Xiaohao Wang
- Division of Advanced Manufacturing, Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China;
- Correspondence: (Q.Y.); (X.W.); Tel.: +86-755-2603-5201 (Q.Y.); +86-755-2603-6618 (X.W.)
| | - Mengkui Tian
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China; (X.F.); (Y.Z.); (M.T.)
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Lionetto F, López-Muñoz R, Espinoza-González C, Mis-Fernández R, Rodríguez-Fernández O, Maffezzoli A. A Study on exfoliation of Expanded Graphite Stacks in Candelilla Wax. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2530. [PMID: 31398950 PMCID: PMC6721147 DOI: 10.3390/ma12162530] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/14/2022]
Abstract
A novel, green route for pre-exfoliation of graphite based on a biodegradable polymer and high-power ultrasound is presented. Candelilla wax (CW), derived from the leaves of the candelilla plant, has been used for the first time as a natural non aqueous medium to induce the pre-exfoliation of expanded graphite (EG) under ultrasonic irradiation in an economical way. The proposed method uses also D-limonene as a natural organic solvent for reducing viscosity and increasing the affinity between the polar groups of EG and candelilla wax, thus improving the intercalation/exfoliation of EG. The quality of dispersion of the nanofiller in the natural wax matrix has been evaluated using multiple techniques. The addition of EG to wax and use of ultrasonic treatment leads to a reduced crystallinity, probably due to restrictions of the molecular movements, improved thermal stability of wax, and to an increased shear thinning exponent, which are all indicative of a high degree of EG dispersion. The ultrasonic dynamic mechanical results suggest a reduction in the cluster size and a better filler dispersion in the wax matrix promoted by polar or chemical reactions between the CW fractions and the graphite stacks, which was observed by XPS analysis. The results were compared to those obtained with paraffin, a synthetic wax, and confirmed the dispersion improvement obtained by using natural wax as a pre-exfoliating medium.
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Affiliation(s)
- Francesca Lionetto
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via per Arnesano, 73100 Lecce, Italy
| | - Roberto López-Muñoz
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Carlos Espinoza-González
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico.
| | - Ricardo Mis-Fernández
- Applied Physics Department, CINVESTAV-IPN, Apdo. Postal 73, 97310 Mérida, Yucatán, Mexico
| | - Oliverio Rodríguez-Fernández
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Alfonso Maffezzoli
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy.
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