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8. Temperature-Responsive Injectable Composite Hydrogels Based on Poly(N -Isopropylacrylamide), Chitosan, and Hemp-Derived Cellulose Nanocrystals.

Author

Promdontree, Praewa, Ounkaew, Artjima, Yao, Yuan, Zeng, Hongbo, Narain, Ravin, and Ummartyotin, Sarute

Subjects
PHASE transitions, CELLULOSE nanocrystals, POLY(ISOPROPYLACRYLAMIDE), TRANSITION temperature, THERMOGRAVIMETRY
Abstract

Injectable and temperature-responsive Poly(N-Isopropylacrylamide) (PNIPAAm)/Chitosan composite hydrogels reinforced with cellulose nanocrystals (CNCs) were successfully fabricated via photopolymerization. 0.1–3% (w/v) of cellulose nanocrystals were incorporated into the PNIPAAm/chitosan matrix to form thermo-responsive injectable composite hydrogels. FT-IR spectra confirmed the successful formation of these hydrogels, highlighting the characteristic peaks PNIPAAm, chitosan and CNCs. The inclusion of CNCs led to a reduced pore size as compared to the control hydrogels. The mechanical properties of the hydrogel were characterized under various temperature conditions. Rheology tests showed that storage modulus (G′) increased significantly above 30 °C, indicating gel-like behavior. Thermogravimetric analysis showed thermal stability up to 300 °C. The volume phase transition temperatures (VPTT) of the hydrogels were found to be in the range of 34–38 °C, close to physiological body temperature. The equilibrium swelling ratio (ESR) of the CNC-containing hydrogels was higher than that of the control. In vitro studies with Human Dermal Fibroblast adult (HDFa) cells showed the hydrogels to be non-toxic, suggesting their potential for biomedical applications. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Enhancing the Properties of Chitosan–Pectin Hydrogels With Cellulose Nanowhiskers for Potential Applications in Wound Dressings.

Author

Ferrante, Micaela, Álvarez, Vera Alejandra, Narain, Ravin, Ounkaew, Artjima, and González, Jimena Soledad

Subjects
POLYMER solutions, WATER vapor, CYTOTOXINS, HYDROGELS, GELATION
Abstract

Chitosan and pectin are employed here in the formation of biodegradable hydrogels. The addition of cellulose nanowhiskers (CNW) into the hydrogels is accomplished through two methods: by swelling, after the polymeric network formation (Method A), and inclusion in polymer solutions before gelation, with varying CNW content (Method B). Comprehensive physico–chemical, thermal, microscopic, gel fraction, and water vapor transmission analyses are conducted, complemented by antibacterial and viability assessments. CNWs are successfully synthesized and incorporated within the hydrogel by both methods. Moreover, the degradation temperature (Tmax) of hydrogels is higher with CNW (0% CNW: 205.5 °C, 10% CNW: 217.0 °C). CNW aggregates are observed in hydrogels with 20% and 30% content but no aggregation is observed with 4% and 10%. The antimicrobial properties are not affected by the addition of CNW, and the cytotoxicity tests reveal better results with 10% CNW compared with 20%. The study signifies the versatility of CNWs as effective reinforcements, influencing structural, thermal, and biological aspects of the hydrogels. The proposed methodology, emphasizing CNW incorporation, lays the groundwork for innovative biomaterials with promising medical implications. This investigation encourages further exploration and validation of these composite hydrogels in vivo for practical medical use in wound dressings. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Photochemical Synthesis of Sericin-Coated Gold Nanorods and Their Antibacterial Activity under Low-Level Near-Infrared Light

Author

Poomrattanangoon, Sasiprapa, Ounkaew, Artjima, Pissuwan, Dakrong, and Narain, Ravin

Abstract

Gold nanorods (GNRs) are unique nanoparticles with easily functionalized surfaces, multiple synthesis methods, photothermal conversion, and surface plasmon resonance effects. These properties make GNRs suitable for various biological applications. However, a rapid synthesis of GNRs using less toxic chemicals is needed. The photochemical method is a viable option that can synthesize GNRs quickly while using fewer chemicals. A photochemical method is reported for the synthesis of GNRs using Irgacure-2959 as a reducing agent. This method could be used to synthesize GNRs with a rod-like shape within 30 min. Additionally, GNRs were coated with sericin (GNRs-SC) to further reduce their toxicity in human dermal fibroblast adult cells. Low-level near-infrared (NIR) light was applied to enhance the photothermal therapy of both GNRs and GNRs-SC. The results showed that GNRs and GNRs-SC under low-level NIR light have enhanced antibacterial activity against Staphylococcus aureusand Escherichia coli, as well as antibiofilm activity against S. aureus. Furthermore, GNRs-SC showed good biocompatibility with antibacterial and antibiofilm activities. These results indicate that GNRs-SC are good candidates for various biological applications.

Published
2024
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25. Contributors

Author

Ahmed, Marya, primary, Arshad, Muhammad, additional, Asha, Anika Benozir, additional, Babooram, Keshwaree, additional, Beck, Seth, additional, Bissessur, Rabin, additional, Chen, Jingsi, additional, Choi, Hyo-Jick, additional, Chopra, Manika, additional, Dussan, Diana Diaz, additional, Ebara, Mitsuhiro, additional, Kaliva, Maria, additional, Kumaran, Surjith Kumar, additional, Mu, Mingwei, additional, Narain, Ravin, additional, Nazeer, Nauman, additional, Oh, Euna, additional, Peng, Yi-Yang, additional, Rahman, Saadman S., additional, Srinivas, Shruti, additional, Ullah, Aman, additional, Vamvakaki, Maria, additional, Wang, Wenda, additional, Yang, Rui, additional, Yusa, Shin-ichi, additional, Zeng, Hongbo, additional, Zhang, Wenling, additional, and Zubair, Muhammad, additional

Published
2020
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28. Hydrogels

Author

Wang, Wenda, primary, Narain, Ravin, additional, and Zeng, Hongbo, additional

Published
2020
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31. Shape-Memory Materials

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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32. Smart Bioconjugates

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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33. Smart Nanoassemblies and Nanoparticles

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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34. Smart Nanofibers

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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35. Smart Surfaces

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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36. Introductory Guide to Smart Biomaterials

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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37. Smart Hydrogels

Author

Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Uto, Koichiro, Aoyagi, Takao, Kim, Young-Jin, Narain, Ravin, Idota, Naokazu, Hoffman, John M., OHASHI, Naoki, Series editor, Ebara, Mitsuhiro, Kotsuchibashi, Yohei, Narain, Ravin, Idota, Naokazu, Kim, Young-Jin, Hoffman, John M., Uto, Koichiro, and Aoyagi, Takao

Published
2014
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40. Contributors

Author

Aguilar, María Rosa, primary, Alonso, Matilde, additional, Asha, Anika B., additional, Berges, C., additional, Blasco, E., additional, Cabello, José Carlos Rodríguez, additional, Carretero-González, Javier, additional, Corrales, Rocío, additional, Cui, J., additional, Custódio, Catarina A., additional, de Torre, Israel Gonzalez, additional, del Agua, Isabel, additional, del Campo, Aránzazu, additional, den Brabander, Michael, additional, Duro-Castano, A., additional, Espinosa-Cano, Eva, additional, Fischer, Hartmut R., additional, Galaev, I.Y., additional, Garcia, Santiago J., additional, García, Félix C., additional, García, José Miguel, additional, García-Arévalo, Carmen, additional, García-Fernández, Luis, additional, Gómez-Mascaraque, L.G., additional, Hao, Xiaojuan, additional, Hasirci, Nesrin, additional, Hoogenboom, Richard, additional, Jorcano, José Luis, additional, López-Manchado, Miguel Angel, additional, Malikmammadov, Elbay, additional, Malliaras, George G., additional, Mano, João F., additional, Mecerreyes, David, additional, Mikhalovsky, S.V., additional, Montero, Andrés, additional, Montero, Jorge, additional, Mora-Boza, Ana, additional, Narain, Ravin, additional, Oriol, L., additional, Palao-Suay, R., additional, Piñol, M., additional, Reglero Ruiz, José A., additional, Reis, Rui L., additional, Reyes-Ortega, Felisa, additional, Rodríguez-Escalona, G., additional, Román, Julio San, additional, Sanchez-Sanchez, Ana, additional, Sánchez-Somolinos, C., additional, Sanjuán, Ana M., additional, Savina, I.N., additional, Srinivas, Shruti, additional, Talelli, M., additional, Valencia, Leticia, additional, Vázquez, Blanca, additional, Velasco, Diego, additional, Vicent, M.J., additional, and Xiong, X., additional

Published
2019
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