Effect of UV irradiation on the physicochemical properties of collagen stabilized using aldehydes

Fathima, Nishter Nishad; Suresh, Raju; Rao, Jonnalagadda Raghava; Nair, Balachandran Unni

doi:10.1002/app.26129

Cited by 16 publications

(2 citation statements)

References 65 publications

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“…Additionally, UV irradiation is applied for material science purposes, including for sterilizing and cross-linking biomaterials [104–106]. As UV can induce a number of alterations in collagen properties, including structure, chemical stability, and mechanical properties [107–111], AFM techniques have been extensively used for investigating UV-collagen interactions.…”

Section: Afm and Collagenmentioning

confidence: 99%

Atomic Force Microscopy on Biological Materials Related to Pathological Conditions

et al. 2019

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Atomic force microscopy (AFM) is an easy-to-use, powerful, high-resolution microscope that allows the user to image any surface and under any aqueous condition. AFM has been used in the investigation of the structural and mechanical properties of a wide range of biological matters including biomolecules, biomaterials, cells, and tissues. It provides the capacity to acquire high-resolution images of biosamples at the nanoscale and allows at readily carrying out mechanical characterization. The capacity of AFM to image and interact with surfaces, under physiologically relevant conditions, is of great importance for realistic and accurate medical and pharmaceutical applications. The aim of this paper is to review recent trends of the use of AFM on biological materials related to health and sickness. First, we present AFM components and its different imaging modes and we continue with combined imaging and coupled AFM systems. Then, we discuss the use of AFM to nanocharacterize collagen, the major fibrous protein of the human body, which has been correlated with many pathological conditions. In the next section, AFM nanolevel surface characterization as a tool to detect possible pathological conditions such as osteoarthritis and cancer is presented. Finally, we demonstrate the use of AFM for studying other pathological conditions, such as Alzheimer’s disease and human immunodeficiency virus (HIV), through the investigation of amyloid fibrils and viruses, respectively. Consequently, AFM stands out as the ideal research instrument for exploring the detection of pathological conditions even at very early stages, making it very attractive in the area of bio- and nanomedicine.

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Section: Afm and Collagenmentioning

confidence: 99%

Atomic Force Microscopy on Biological Materials Related to Pathological Conditions

et al. 2019

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“…The biofriendly approaches of preparing tissue engineering scaffolds by energy excitation rather than by introducing extra toxic chemical cross-linkers have attracted more and more attention, such as ultraviolet (UV), electron beam (EB), and γ-ray . In comparison, UV irradiation can hardly reach the deeper part of the materials due to the limitation of light’s penetration depth and will result in an uneven cross-linking network .…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Structure and Mechanical Properties of Highly Tunable Elastomeric Silk Fibroin Hydrogels Cross-Linked by γ-Ray Radiation

Sun

et al. 2019

ACS Appl. Bio Mater.

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Silk fibroin (SF) is a natural polymer with low immunogenicity and good biocompatibility. However, most silkbased hydrogels formed through chemical or physical cross-linking are brittle, the preparation of which also inevitably introduces cytotoxic cross-linking agents. Herein, a simple strategy is presented for synthesizing SF hydrogels with tunable mechanical properties by combining γ-ray radiation with ethanol treatment. Neither toxic initiators nor chemical agents are utilized during the whole preparation procedure. For "soft" hydrogels, the compressive moduli are less than 29 kPa (SF-S hydrogels), while for "tough" hydrogels, the compressive moduli are between 1.21 and 2.41 MPa (SF-D hydrogels). Specifically, γ-ray radiation makes SF form uniform and stable chemical cross-linking sites within and between molecular chains, resulting in "soft" and highly elastic SF hydrogels. The physical cross-linking via ethanol treatment leads to the self-assembly of fibroin chains, transforming those soft hydrogels to tough hydrogels. These double cross-linked SF hydrogels (SF-D hydrogels) exhibit excellent mechanical strength. Effects of various cross-linking conditions on the secondary structure, pore structure, mechanical properties, gelation degree, swelling, and in vitro degradation properties are explored. A series of cell experiments demonstrate that the SF hydrogels with different mechanical strength can stimulate the expression of specific genes of rat bone marrow mesenchymal stem cells (BMSCs) in various differentiation directions. These results also show the application prospects in tissue engineering by customizing hydrogels for the mechanical strength of different tissues.

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Stabilization of collagen by the plant polyphenolics Acacia mollissima and Terminalia chebula

Krishnamoorthy

Madhan

Sadulla

et al. 2007

J of Applied Polymer Sci

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The central role of collagen as the major structural fibrous protein in the mammalian extracellular matrix has motivated a significant effort toward the determination of its mechanical properties at all levels, ranging from single monomers and long-chain polymers to a structural element within a biological tissue. However, the stabilization of collagen against collagenolytic degradation finds significance in biomedical and industrial applications. Tannins are plant-derived polyphenols that have the ability to inhibit the collagenase activity at minimum concentration. The inhibitory effect of wattle (Acacia mollissima) and myrobalan (Terminalia chebula) on the action of collagenase against collagen was probed in this study. The kinetics of the inhibition of collagenase by wattle and myrobalan was deduced from the extent of hydrolysis of 2-furanacryloyl-L-leucyl-glycyl-L-prolyl-L-alanine. Both wattle and myrobalan tannin exhibited competitive modes of inhibition against collagenase. Circular dichroism studies of collagenase on treatment with wattle and myrobalan revealed changes in the secondary structure of collagenase. These results suggest that the tannins of A. mollissima and T. chebula extracts facilitated collagen stabilization through collagenase inhibition.

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Effect of UV irradiation on the physicochemical properties of collagen stabilized using aldehydes

Cited by 16 publications

References 65 publications

Atomic Force Microscopy on Biological Materials Related to Pathological Conditions

Atomic Force Microscopy on Biological Materials Related to Pathological Conditions

Investigation on the Structure and Mechanical Properties of Highly Tunable Elastomeric Silk Fibroin Hydrogels Cross-Linked by γ-Ray Radiation

Stabilization of collagen by the plant polyphenolics Acacia mollissima and Terminalia chebula

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