scholarly journals Chitosan and Cellulose-Based Hydrogels for Wound Management

2020 ◽  
Vol 21 (24) ◽  
pp. 9656
Author(s):  
Sibusiso Alven ◽  
Blessing Atim Aderibigbe
Keyword(s):  
Bacterial Infections ◽  
Antibacterial Agents ◽  
Chronic Wounds ◽  
Wound Dressings ◽  
Wound Management ◽  
Bacterial Invasion ◽  
High Moisture Content ◽  
High Moisture ◽  
Moist Environment ◽  
Dressing Materials

Wound management remains a challenge worldwide, although there are several developed wound dressing materials for the management of acute and chronic wounds. The wound dressings that are currently used include hydrogels, films, wafers, nanofibers, foams, topical formulations, transdermal patches, sponges, and bandages. Hydrogels exhibit unique features which make them suitable wound dressings such as providing a moist environment for wound healing, exhibiting high moisture content, or creating a barrier against bacterial infections, and are suitable for the management of exuding and granulating wounds. Biopolymers have been utilized for their development due to their non-toxic, biodegradable, and biocompatible properties. Hydrogels have been prepared from biopolymers such as cellulose and chitosan by crosslinking with selected synthetic polymers resulting in improved mechanical, biological, and physicochemical properties. They were useful by accelerating wound re-epithelialization and also mimic skin structure, inducing skin regeneration. Loading antibacterial agents into them prevented bacterial invasion of wounds. This review article is focused on hydrogels formulated from two biopolymers—chitosan and cellulose—for improved wound management.

Fluorescent Imaging and Precise Suppression of Bacterial Infection in Chronic Wounds by Porphyrin-Based Metal-Organic Framework Nanorod

2021 ◽  
Author(s):  
zhen zou ◽  
Lihua Zhang ◽  
Minzhi Ouyang ◽  
Yufei Zhang ◽  
Huanxiang Wang ◽  
...  
Keyword(s):  
Bacterial Infection ◽  
Antibacterial Agents ◽  
Chronic Wounds ◽  
Chronic Wound ◽  
Metal Organic Framework ◽  
Critical Role ◽  
Fluorescent Imaging ◽  
Wound Management ◽  
Metal Organic ◽  
Chronic Wound Management

Nano-antibacterial agents play a critical role in chronic wound management. However, an intelligent nanosystem that can provide both visual warning of infection and precise sterilization remains a hurdle. Herein, a...

scholarly journals Hydrogel-Based Strategies to Advance Therapies for Chronic Skin Wounds

2019 ◽  
Vol 21 (1) ◽  
pp. 145-169 ◽  
Author(s):  
Lucília P. da Silva ◽  
Rui L. Reis ◽  
Vitor M. Correlo ◽  
Alexandra P. Marques
Keyword(s):  
Tissue Engineering ◽  
Chronic Wounds ◽  
Significant Risk ◽  
Skin Regeneration ◽  
Wound Management ◽  
Skin Wounds ◽  
Preclinical Models ◽  
Moist Environment ◽  
Chronic Skin ◽  
Bioactive Agents

Chronic skin wounds are the leading cause of nontraumatic foot amputations worldwide and present a significant risk of morbidity and mortality due to the lack of efficient therapies. The intrinsic characteristics of hydrogels allow them to benefit cutaneous healing essentially by supporting a moist environment. This property has long been explored in wound management to aid in autolytic debridement. However, chronic wounds require additional therapeutic features that can be provided by a combination of hydrogels with biochemical mediators or cells, promoting faster and better healing. We survey hydrogel-based approaches with potential to improve the healing of chronic wounds by reviewing their effects as observed in preclinical models. Topics covered include strategies to ablate infection and resolve inflammation, the delivery of bioactive agents to accelerate healing, and tissue engineering approaches for skin regeneration. The article concludes by considering the relevance of treating chronic skin wounds using hydrogel-based strategies.

scholarly journals Electrospun antibacterial nanofibers for wound dressings and tissue medicinal fields: A Review

2020 ◽  
Vol 13 (05) ◽  
pp. 2030012 ◽  
Author(s):  
Zhimei Wei ◽  
Liqun Wang ◽  
Shouyu Zhang ◽  
Tonghai Chen ◽  
Jie Yang ◽  
...  
Keyword(s):  
Wound Healing ◽  
Biomedical Applications ◽  
Bacterial Infections ◽  
Antibacterial Agents ◽  
Antimicrobial Agents ◽  
Electrospinning Process ◽  
Wound Dressings ◽  
Electrospun Fibers ◽  
Chronic Infections ◽  
Antibacterial Material

Bacterial infections are a major cause of chronic infections. Thus, antibacterial material is an urgent need in clinics. Antibacterial nanofibers, with expansive surface area, enable efficient incorporation of antibacterial agents. Meanwhile, structure similar to the extracellular matrix can accelerate cell growth. Electrospinning, the most widely used technique to fabricate nanofiber, is often used in many biomedical applications including drug delivery, regenerative medicine, wound healing and so on. Thus, this review provides an overview of all recently published studies on the development of electrospun antibacterial nanofibers in wound dressings and tissue medicinal fields. This reviewer begins with a brief introduction of electrospinning process and then discusses electrospun fibers by incorporating various types of antimicrobial agents used as in wound dressings and tissue. Finally, we finish with conclusions and further perspectives on electrospun antibacterial nanofibers as 2D biomedicine materials.

Antibacterial Strategies for Wound Dressing: Preventing Infection and Stimulating Healing

2018 ◽  
Vol 24 (8) ◽  
pp. 936-951 ◽  
Author(s):  
Zhengwen Li ◽  
Menno Knetsch
Keyword(s):  
Wound Infection ◽  
Wound Dressing ◽  
Antibacterial Agents ◽  
Controlled Drug Release ◽  
Research Direction ◽  
Infection Process ◽  
Wound Dressings ◽  
Wound Management ◽  
Global Issue ◽  
Insight Into

Wound management is an important and increasing global issue. Infection of a wound can cause a delay in wound healing and pain, but also more serious complications like tissue necrosis or even sepsis, which can lead to loss of tissue, limbs or life. Antibacterial agents have been introduced into wound infection care. In this review, we provide an insight into the current antibacterial strategies of wound dressings, including wound infection process, antibacterial agents, and controlled drug release systems. We also emphasize the development of intelligent wound dressing and introduce a promising research direction.

scholarly journals Injectable Scaffolds Enriched with Silver to Inhibit Bacterial Invasion in Tissue Regeneration

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1931 ◽  
Author(s):  
Chiara Ceresa ◽  
Letizia Fracchia ◽  
Alice Marchetti ◽  
Maurizio Rinaldi ◽  
Michela Bosetti
Keyword(s):  
Antibacterial Activity ◽  
Bacterial Infections ◽  
Wound Management ◽  
Bacterial Invasion ◽  
Dependent Manner ◽  
Skin Substitutes ◽  
Silver Addition ◽  
Concentration Dependent Manner ◽  
Injectable Scaffolds ◽  
Incomplete Healing

During wound healing, bacterial infections may prolong skin regeneration and tissue repair, causing delayed or incomplete healing. The therapeutic strategies currently used include general therapeutic modes, growth factors, skin substitutes, matrices and/or cell therapy. Among recent technologies, wound dressing materials comprising silver nitrate or silver sulfadiazine as the antimicrobial agent are widespread, despite their known cytotoxicity. The aim of this work was to develop and evaluate the efficacy of gelatinous injectable biomaterials composed of collagen and alginates, enriched with silver against bacterial pathogens commonly involved in wound infections. To reduce cytotoxicity, silver was used as lactate and saccharinated salts. Results show that silver-enriched beads were effective against both Gram-positive and Gram-negative strains in a concentration-dependent manner. Silver addition was more active against Staphylococcus epidermidis than against Pseudomonas aeruginosa. The antibacterial activity was localized only in the area of contact with the beads at concentrations lower than 0.3 mM, whereas at higher concentrations a larger inhibition halo was observed. No cytotoxic effect on eukaryotic cells was seen both testing the materials’ extracts or the Ag-doped beads in contact tests. These results, although preliminary, suggest that these scaffolds are a promising approach for realizing injectable or spreadable functional biomaterials with antibacterial activity for applications in wound management.

scholarly journals Porous Curdlan-Based Hydrogels Modified with Copper Ions as Potential Dressings for Prevention and Management of Bacterial Wound Infection—An In Vitro Assessment

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1893
Author(s):  
Aleksandra Nurzynska ◽  
Katarzyna Klimek ◽  
Iga Swierzycka ◽  
Krzysztof Palka ◽  
Grazyna Ginalska
Keyword(s):  
Bacterial Infections ◽  
Chronic Wounds ◽  
Copper Ions ◽  
Bacterial Colonization ◽  
Antibacterial Properties ◽  
Biological Properties ◽  
Wound Dressings ◽  
Wound Fluid ◽  
Potential Safety

Bacterial infections at the wound site still remain a huge problem for current medicine, as they may lead to development of chronic wounds. In order to prevent such infections, there is a need to use wound dressings that possess ability to inhibit bacterial colonization. In this study, three new curdlan-based biomaterials modified with copper ions were fabricated via simple and inexpensive procedure, and their structural, physicochemical, and biological properties in vitro were evaluated. Received biomaterials possessed porous structure, had ability to absorb high amount of simulated wound fluid, and importantly, they exhibited satisfactory antibacterial properties. Nevertheless, taking into account all evaluated properties of new curdlan-based biomaterials, it seems that Cur_Cu_8% is the most promising biomaterial for management of wounds accompanied with bacterial infections. This biomaterial exhibited the best ability to reduce Escherichia coli and Staphylococcus aureus growth and moreover, it absorbed the highest amount of simulated wound fluid as well as enabled optimal water vapor transmission. Furthermore, Cur_Cu_8% biomaterial possessed the best values of selective indexes, which determine its potential safety in vitro. Thus, Cur_Cu_8% hydrogel may be considered as a promising candidate for management of infected wounds as well as it may constitute a good platform for further modifications.

Microbial alginate dressings show improved binding capacity for pathophysiological factors in chronic wounds compared to commercial alginate dressings of marine origin

2017 ◽  
Vol 31 (9) ◽  
pp. 1267-1276 ◽  
Author(s):  
Melissa Fischer ◽  
Florian Gebhard ◽  
Timo Hammer ◽  
Christian Zurek ◽  
Guido Meurer ◽  
...  
Keyword(s):  
Wound Healing ◽  
Chronic Wounds ◽  
Azotobacter Vinelandii ◽  
Binding Capacity ◽  
Matrix Metalloproteases ◽  
Wound Dressings ◽  
Wound Management ◽  
Positive Effects ◽  
Alginate Fibres

Marine alginates are well established in wound management. Compared with different modern wound dressings, marine alginates cannot prove superior effects on wound healing. Alginates from bacteria have never been studied for medical applications so far, although the microbial polymer raises expectations for improved binding of wound factors because of its unique O-acetylation. Due to its possible positive effects on wound healing, alginates from bacteria might be a superior future medical product for clinical use. To prove the binding capacity of microbial alginates to pathophysiological factors in chronic wounds, we processed microbial alginate fibres, produced from fermentation of the soil bacterium Azotobacter vinelandii ATCC 9046, into needle web dressings and compared them with commercial dressings made of marine alginate. Four dressings were assessed: Marine alginate dressings containing either ionic silver or zinc/manganese/calcium, and microbial alginate dressings with and without nanosilver. All dressings were tested in an in vitro approach for influence on chronic wound parameters such as elastase, matrix metalloproteases-2, tumour necrosis factor-α, interleukin-8, and free radical formation. Despite the alginate origin or addition of antimicrobials, all dressings were able to reduce the concentration of the proinflammatory cytokines TNF-α and IL-8. However, microbial alginate was found to bind considerable larger amounts of elastase and matrix metalloproteases-2 in contrast to the marine alginate dressings. The incorporation of zinc, silver or nanosilver into alginate fibres did not improve their binding capacity for proteases or cytokines. The addition of nanosilver slightly enhanced the antioxidant capacity of microbial alginate dressings, whereas the marine alginate dressing containing zinc/manganese/calcium was unable to inhibit the formation of free radicals. The enhanced binding affinity by microbial alginate of Azotobacter vinelandii to pathophysiological factors may be interesting to support optimal conditions for wound healing.

scholarly journals Electrospun Antibacterial Nanomaterials for Wound Dressings Applications

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 908
Author(s):  
Aysegul Gul ◽  
Izabela Gallus ◽  
Akshat Tegginamath ◽  
Jiri Maryska ◽  
Fatma Yalcinkaya
Keyword(s):  
Wound Healing ◽  
Wound Dressing ◽  
Bacterial Infections ◽  
Antimicrobial Agents ◽  
Chronic Wounds ◽  
Antibacterial Properties ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Wound Dressings ◽  
Promising Solution

Chronic wounds are caused by bacterial infections and create major healthcare discomforts; to overcome this issue, wound dressings with antibacterial properties are to be utilized. The requirements of antibacterial wound dressings cannot be fulfilled by traditional wound dressing materials. Hence, to improve and accelerate the process of wound healing, an antibacterial wound dressing is to be designed. Electrospun nanofibers offer a promising solution to the management of wound healing, and numerous options are available to load antibacterial compounds onto the nanofiber webs. This review gives us an overview of some recent advances of electrospun antibacterial nanomaterials used in wound dressings. First, we provide a brief overview of the electrospinning process of nanofibers in wound healing and later discuss electrospun fibers that have incorporated various antimicrobial agents to be used in wound dressings. In addition, we highlight the latest research and patents related to electrospun nanofibers in wound dressing. This review also aims to concentrate on the importance of nanofibers for wound dressing applications and discuss functionalized antibacterial nanofibers in wound dressing.

scholarly journals Modulation of macrophage functions by ECM-inspired wound dressings – a promising therapeutic approach for chronic wounds

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Marta Torregrossa ◽  
Ainur Kakpenova ◽  
Jan C. Simon ◽  
Sandra Franz
Keyword(s):  
Wound Dressing ◽  
Chronic Wounds ◽  
Chronic Wound ◽  
Wound Dressings ◽  
Promising Therapeutic Approach ◽  
Therapeutic Concepts ◽  
Common Skin ◽  
Further Development ◽  
Dressing Materials ◽  
Review Current

Abstract Nonhealing chronic wounds are among the most common skin disorders with increasing incidence worldwide. However, their treatment is still dissatisfying, that is why novel therapeutic concepts targeting the sustained inflammatory process have emerged. Increasing understanding of chronic wound pathologies has put macrophages in the spotlight of such approaches. Herein, we review current concepts and perspectives of therapeutic macrophage control by ECM-inspired wound dressing materials. We provide an overview of the current understanding of macrophage diversity with particular view on their roles in skin and in physiological and disturbed wound healing processes. Based on this we discuss strategies for their modulation in chronic wounds and how such strategies can be tailored in ECM-inspired wound dressing. The latter utilize and mimic general principles of ECM-mediated cell control, such as binding and delivery of signaling molecules and direct signaling to cells specifically adapted for macrophage regulation in wounds. In this review, we present examples of most recent approaches and discuss ideas for their further development.

scholarly journals The use of wound dressings as a means to alter the composition of biofilms in a chronic wound model

2020 ◽  
Vol 2 (7A) ◽  
Author(s):  
Gabriela Nedelea ◽  
Sarah Maddocks
Keyword(s):  
Chronic Wounds ◽  
Chronic Wound ◽  
Low Ph ◽  
Wound Dressings ◽  
Wound Management ◽  
Chronic Infections ◽  
Gram Negative ◽  
Negative Shift ◽  
Wound Model ◽  
Chronic Wound Management

It is estimated that £5 billion are invested yearly into chronic wound management by the NHS. Whilst the demand for treatment rises every year, it has become harder to treat wounds given the burden of antimicrobial resistance. Chronic wounds can easily become harbouring grounds for polymicrobial biofilms in which species interact in specific ways. This study assessed the interactions between two commonly co-isolated chronic wound pathogens: Pseudomonas aeruginosa (ATCC 9027) and Staphylococcus aureus (EMRSA 15), whose biofilm relation initiates a Gram-negative shift. During this phenomenon, P. aeruginosa takes over the majority of the bacterial community, at the detriment of S. aureus. The Gram-negative shift marks the turning point from an acute to a chronic wound. The pH of a chronic wound is typically alkaline, and it was hypothesised that topical dressings with an acidic pH could disrupt the onset of the Gram negative shift, and therefore chronicity. Six different topical dressings with low pH were used in achronic wound model to assess their ability to reverse or delay the Gram-negative shift. It was found that they did not have an impact on the onset of the Gram-negative shift, despite their low pH values. However, the lower the pH of the dressings, the more frequently small colony variant (SCV) bacteria were observed in the biofilm. SCVs are known for causing persistent or chronic infections. It was therefore concluded that low pH dressings alone may not be favourable for managing chronic wound infection.

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