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Shajari G, Erfan-Niya H, Fathi M, Amiryaghoubi N. In situ forming hydrogels based on modified gellan gum/chitosan for ocular drug delivery of timolol maleate. Int J Biol Macromol 2024; 278:135071. [PMID: 39187113 DOI: 10.1016/j.ijbiomac.2024.135071] [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: 09/13/2023] [Revised: 08/15/2024] [Accepted: 08/24/2024] [Indexed: 08/28/2024]
Abstract
In situ forming hydrogels are suitable candidates for increasing drug residence time in ocular drug delivery. In this study, gellan gum (GG) was oxidized to form aldehyde groups and in situ gelling hydrogels were synthesized based on a Schiff-base reaction between oxidized GG (OGG) and chitosan (CS) in the presence of β-glycerophosphate. The effect of OGG and CS concentration on the physical and chemical properties of the resulting hydrogels was investigated. The FT-IR spectroscopy confirmed the chemical modification of OGG as well as the functional groups of the prepared hydrogels. The scanning electron microscope (SEM) revealed the highly porous structure of hydrogels. The obtained hydrogels indicated a high swelling degree and degradability. Also, the rheological studies demonstrated self-healing behavior, shear thinning, thixotropy, and mucoadhesion properties for the developed hydrogels. The results of in vitro and ex vivo studies showed that the timolol-loaded hydrogel with a higher amount of OGG has a higher release rate. Moreover, the MTT cytotoxicity test on bone marrow mesenchymal stem cells (BMSCs) confirmed that developed hydrogels are not toxic. The obtained results revealed that the developed hydrogels can be a desirable choice for the ocular drug delivery of timolol in the treatment of glaucoma.
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Affiliation(s)
- Golnaz Shajari
- Faculty of Chemical and Petroleum Engineering, University of Tabriz, 51666-16471 Tabriz, Iran
| | - Hamid Erfan-Niya
- Faculty of Chemical and Petroleum Engineering, University of Tabriz, 51666-16471 Tabriz, Iran.
| | - Marziyeh Fathi
- Research Center for Pharmaceutical Nanotechnology, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Nazanin Amiryaghoubi
- Research Center for Pharmaceutical Nanotechnology, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
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Wang J, Zhang Z, Dai T, Zhang Z, Zhang Q, Yao J, Wang L, He N, Li S. The therapeutic effect and possible mechanisms of alginate oligosaccharide on metabolic syndrome by regulating gut microbiota. Food Funct 2024; 15:9632-9661. [PMID: 39239698 DOI: 10.1039/d4fo02802c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2024]
Abstract
Metabolic syndrome (MetS) is a disease condition incorporating the abnormal accumulation of various metabolic components, including overweight or abdominal obesity, insulin resistance and abnormal glucose tolerance, hypertension, atherosclerosis, or dyslipidemia. It has been proved that the gut microbiota and microbial-derived products play an important role in regulating lipid metabolism and thus the onset and development of MetS. Previous studies have demonstrated that oligosaccharides with prebiotic effects, such as chitosan oligosaccharides, can regulate the structure of the microbial community and its derived products to control weight and reduce MetS associated with obesity. Alginate oligosaccharides (AOS), natural products extracted from degraded alginate salts with high solubility and extensive biological activity, have also been found to modulate gut microbiota. This review aims to summarize experimental evidence on the positive effects of AOS on different types of MetS while providing insights into mechanisms through which AOS regulates gut microbiota for preventing and treating MetS.
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Affiliation(s)
- Jingyi Wang
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
- Department of Obstetrics and Gynecology, The Affiliated Qingdao Municipal Hospital of Qingdao University, Qingdao, 266000, China
| | - Zixuan Zhang
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Tong Dai
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Ziheng Zhang
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Qingfeng Zhang
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Jingtong Yao
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Lijing Wang
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
- Department of Obstetrics and Gynecology, The Affiliated Qingdao Municipal Hospital of Qingdao University, Qingdao, 266000, China
- Department of Obstetrics, Qingdao Municipal Hospital, Qingdao, 266000, China
| | - Ningning He
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
| | - Shangyong Li
- School of Basic Medicine, Qingdao Medical College, Qingdao, University, Qingdao 266071, China.
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Ege D, Boccaccini AR. Investigating the Effect of Processing and Material Parameters of Alginate Dialdehyde-Gelatin (ADA-GEL)-Based Hydrogels on Stiffness by XGB Machine Learning Model. Bioengineering (Basel) 2024; 11:415. [PMID: 38790283 PMCID: PMC11117982 DOI: 10.3390/bioengineering11050415] [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: 03/05/2024] [Revised: 03/26/2024] [Accepted: 04/18/2024] [Indexed: 05/26/2024] Open
Abstract
To address the limitations of alginate and gelatin as separate hydrogels, partially oxidized alginate, alginate dialdehyde (ADA), is usually combined with gelatin to prepare ADA-GEL hydrogels. These hydrogels offer tunable properties, controllable degradation, and suitable stiffness for 3D bioprinting and tissue engineering applications. Several processing variables affect the final properties of the hydrogel, including degree of oxidation, gelatin content and type of crosslinking agent. In addition, in 3D-printed structures, pore size and the possible addition of a filler to make a hydrogel composite also affect the final physical and biological properties. This study utilized datasets from 13 research papers, encompassing 33 unique combinations of ADA concentration, gelatin concentration, CaCl2 and microbial transglutaminase (mTG) concentrations (as crosslinkers), pore size, bioactive glass (BG) filler content, and one identified target property of the hydrogels, stiffness, utilizing the Extreme Boost (XGB) machine learning algorithm to create a predictive model for understanding the combined influence of these parameters on hydrogel stiffness. The stiffness of ADA-GEL hydrogels is notably affected by the ADA to GEL ratio, and higher gelatin content for different ADA gel concentrations weakens the scaffold, likely due to the presence of unbound gelatin. Pore size and the inclusion of a BG particulate filler also have a significant impact on stiffness; smaller pore sizes and higher BG content lead to increased stiffness. The optimization of ADA-GEL composition and the inclusion of BG fillers are key determinants to tailor the stiffness of these 3D printed hydrogels, as found by the analysis of the available data.
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Affiliation(s)
- Duygu Ege
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany;
- Institute of Biomedical Engineering, Bogazici University, Rasathane St., Kandilli, 34684 İstanbul, Turkey
| | - Aldo R. Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany;
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Ahmed S, Jeong JE, Kim JC, Lone S, Cheong IW. Self-healing polymers for surface scratch regeneration. RSC Adv 2023; 13:35050-35064. [PMID: 38046629 PMCID: PMC10690873 DOI: 10.1039/d3ra06676b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 11/08/2023] [Indexed: 12/05/2023] Open
Abstract
Recently, there has been a significant increase in academic and industrial interest in self-healing polymers (SHPs) due to their remarkable ability to regenerate scratched surfaces and materials of astronomical significance. Scientists have been inspired by the magical repairing mechanism of the living world. They transformed the fiction of self-healing into reality by designing engrossing polymeric materials that could self-repair mechanical abrasions repeatedly. As a result, the durability of the materials is remarkably improved. Thus, the idea of studying SHPs passively upholds economic and environmental sustainability. However, the critical areas of self-healing (including healing efficiency, healing mechanism, and thermo-mechanical property changes during healing) are under continuous scientific improvisation. This review highlights recent notable advances of SHPs for application in regenerating scratched surfaces with various distinctive underlying mechanisms. The primary focus of the work is aimed at discussing the impact of SHPs on scratch-healing technology. Beyond that, insights regarding scratch testing, methods of investigating polymer surfaces, wound depths, the addition of healing fillers, and the environmental conditions maintained during the healing process are reviewed thoroughly. Finally, broader future perspectives on the challenges and prospects of SHPs in healing surface scratches are discussed.
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Affiliation(s)
- Sana Ahmed
- Department of Applied Chemistry, Kyungpook National University Daegu 41566 Republic of Korea
| | - Ji-Eun Jeong
- Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology Ulsan 44412 Republic of Korea
| | - Jin Chul Kim
- Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology Ulsan 44412 Republic of Korea
| | - Saifullah Lone
- Department of Chemistry, iDREAM (Interdisciplinary Division for Renewable Energy & Advanced Materials), NIT Srinagar 190006 India
| | - In Woo Cheong
- Department of Applied Chemistry, Kyungpook National University Daegu 41566 Republic of Korea
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