REVIEW PAPER |
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Research on Application of Silk in Biomaterial Field |
Yan MA(),Zhi LI,Ruilong RAN,Kang LI
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College of Textiles & Garments,Southwest University,Chongqing 400715 |
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Abstract Silk is an excellent natural protein fiber as well as a high-quality polymer protein material with good mechanical properties, biocompatibility, controllable biodegradability, etc. With the gradual development of biomaterial field and the cross-integration of various disciplines, silk as a biomaterial has shown the strong competitiveness and exhibited great application potential in this field. In this paper, the composition and characteristics of silk are introduced, and the extracting methods for both silk fibroin and sericin are also summarized. Furthermore, the applications of silk and silk proteins in tissue engineering, drug loading and wound dressing in recent years are reviewed. Besides, the functions of silk and silk proteins for specific applications as well as the advantages and disadvantages of silk-based material are analyzed. Finally, the application prospect of silk in biomaterial field is proposed.
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Published: 10 January 2018
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The SEM (a) morphology and (b) inner structure of silk
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Degumming methods | Characteristics | References | Enzymatic degumming method | Little damage to silk fibron (SF), no fuzziness, good bulkiness | [21-22] | Soaping method | Moderate SF color, but inferior softness and feel compared to enzymatic method | [21] | Sodium carbonate degumming method | Simple and fast process, but a bit yellow SF color | [23] | Urea degumming method | Favorable and whiter SF color | [23] | Water degumming method | Good degumming effect both in acidic and alkaline aqueous solutions, pleasurable SF color | [24] |
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Degumming methods of silk and their characteristics
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Extraction methods for sericin | Characteristics | References | Freezing method | Facile recycling process, yield up to 75% after at low temperature freezing | [26] | Dialysis method | High yield (up to 81.5%) | [26] | Spray-drying method | Short process, suitable for mass production, but low yield(~30%) | [27] | Freeze-drying method | Time-consuming, low efficiency, not suitable for mass production | [27] |
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Extraction methods for sericin and their characteristics
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Application | Preparation methods | Characteristics | References | Bone tissue engineering | Coprecipitation method, low-temperature 3D printing, mechanical blending, etc. | Good mechanical properties, promoting a variety of cell adhesion growth, repairing cartilage tissue, delaying the occurrence of arthritis | [28,34] | Tendon and ligament tissue engineering | Weaving, freeze-drying, electrospinning, etc. | Similar mechanical properties to tendons and ligaments, meeting different clinical requirements | [41,71-72] | Vascular tissue engineering | Weaving, electrospinning, etc. | Anticoagulant function, good biocompatibility, favorable to endothelialization in artificial blood vessels | [45,47,72] | Skin tissue engineering | Freeze-drying, electrospinning, etc. | Amino acid composition of silk fibroin is similar to that of human skin, sericin can well promote the growth of fibroblasts | [49,51] | Nerve tissue engineering | 3D printing, electrospinning, hypotonic-lyophilization, etc. | Good biocompatibility and compression resistance, no obvious cytotoxicity | [56,73-74] | Drug delivery system | Supercritical fluid technique, freeze- drying, electrospinning, etc. | Good biocompatibility, negligible influence on the biological activity, enabling targeted therapy, controllable drug release | [75-76] | Wound dressing | Dry film-forming, freeze- drying, electrospinning, etc. | Good plasticity, good air permeability, non-toxicity, beneficial to wound healing | [8-9,65] | Hemostatic material | Weaving, freeze-drying, electrospinning, etc. | Good biocompatibility, non-toxicity, less inflammatory response, good air permeability | [68-70] |
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Application of silk in biomaterial field
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