Effects of different Bombyx mori silkworm varieties on the structural characteristics and properties of silk

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Section: Methodsmentioning

confidence: 99%

Storage stability of silk solution for viscosity and electrospinnability

Kim¹,

Um²

2016

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“…Silk cocoons of the same silkworm variety used in the previous study were selected (Chung et al, 2015). Eight different original B. mori varieties were grown at the Kyungpook Sericulture and Insect Research Center, and a hybrid B. mori variety (Baekokjam) was grown at the Yeongdeok Taeyang Farm in South Korea.…”

Section: Materials and Methods Preparationmentioning

confidence: 99%

“…Recently, Chung et al (2015) reported that molecular weight (MW), solution viscosity, and film mechanical properties of regenerated silk fibroin (SF) were significantly different depending on the silkworm variety. They suggested the possibility of improving the mechanical properties of sericin film.…”

Section: Applicationsmentioning

confidence: 99%

“…Considering that regenerated SF showed somewhat different MW and solution viscosity according to the silkworm variety (Chung et al, 2015), it is interesting to note that sericin showed no significant difference in solution viscosity among the silkworm varieties. That is, N74 and Wonwon 126 showed the highest (0.75 Pa·s) and lowest (0.20 Pa·s) solution viscosity for regenerated SF among the nine silkworm varieties.…”

Section: Rheological Properties Of the Sericin Solutionmentioning

confidence: 99%

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Structure and properties of silk sericin obtained from different silkworm varieties

Chung¹,

Lee²,

Kweon³

et al. 2015

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Recently, many researchers have studied silk sericin because of its high water retention, good wound healing, good cyto-compatibility, and blood-glucose-and cholesterol-lowering effects. Although sericin film can be used in wound dressing and cosmetic packs, its poor mechanical properties have prevented its use in industrial fields. In the present study, sericin was obtained from different silkworm varieties, and the effect of silkworm variety on the structure and properties of sericin was examined. Except for a small difference in serine content, no significant difference in sericin was noted among the silkworm varieties. In addition, silkworm variety almost had no effect on solution viscosity, implying that it does not influence the molecular weight of sericin. Mechanical properties of sericin film were strongly affected by silkworm variety. Wonwon 126 showed the best mechanical properties, while N74 and Geumgwangju displayed the worst properties. IntroductionRemoval of sericin from silk fibers improves the luster and feel of silk textiles, and so, sericin was considered a useless protein.However, silk sericin was recently reported to exhibit inhibition of ultraviolet B-induced apoptosis in human skin keratinocytes (Dash et al., 2008), high water retention, wound-healing properties (Nagai et al., 2009), cyto-compatibility (Tsubouchi et al., 2005, and blood-glucose-and cholesterol-lowering effects (Limpeanchob et al., 2010;Seo et al., 2011). Therefore, researchers are studying sericin for various biotechnological applications, including cosmetics and wound dressing.Sericin film can be used in various applications. However, sericin film is too brittle, showing poor mechanical properties that restrict its application in various biotechnological fields.Recently, Jo and Um (2015) reported that formic acid casting can induce a two-fold increase in the mechanical properties of sericin film. However, the mechanical properties of sericin film need to be enhanced to a greater extent for biomedical and cosmetic applications.Silk is produced by the silkworm (Bombyx mori), and many varieties of B. mori exist. Recently, Chung et al. (2015) reported that molecular weight (MW), solution viscosity, and film mechanical properties of regenerated silk fibroin (SF) were significantly different depending on the silkworm variety. They suggested the possibility of improving the mechanical properties of sericin film.In the present study, nine different B. mori varieties were used

“…Recently, Chung et al (2015) studied the differences in structural characteristics and properties *Corresponding author. In Chul Um Department of Bio-fibers and Materials Science, Kyungpook National University, Daegu 702-701, Republic of Korea Tel: +82-53-950-7757 / FAX: +82-53-950-6744 E-mail: icum@knu.ac.kr Effect of silkworm varieties on wet spinning of silk through nonwoven fabric to remove the insoluble particles prior to wet spinning.…”

Section: Introductionmentioning

confidence: 99%

Effect of different Bombyx mori silkworm varieties on the wet spinning of silk fibroin

Jang¹,

Um²

2015

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The wet spinning of silk solution has attracted researchers' attention because of 1) unique properties of silk as a biomedical material and 2) easy control of the structure and properties of the regenerated silk fiber. Recently, studies have reported that different silkworm varieties produce silk with differences in the molecular weight (MW) and other mechanical properties of the regenerated silk fibroin (SF) film. In this study, we look at the effect of different Bombyx mori varieties on the wet spinning of SF. Although five regenerated SFs from different silkworm varieties have different MWs and solution viscosity, the wet spinnability and post drawing performance of regenerated SFs were not different. This result is due to low variability in the MW of the regenerated SF samples from the different silkworm varieties. In addition, unlike regenerated SF films, the mechanical properties of wet spun regenerated SF filament were not affected by silkworm variety. This result suggests that the mechanical properties of wet spun SF filament are less affected by MW than those of SF film are. IntroductionSilk has been an important textile material for a long time due to its excellent luster and touch. Additionally, owing to its compatibility with blood (Sakabe et al., 1989;Um et al., 2002) and excellent cyto-compatibility (Minoura et al., 1995), silk has many biomedical applications. Specifically, silk can successfully be used in artificial eardrums (Kim et al., 2010), as a membrane (Trabbic and Yager, 1998;Ha et al., 2005).There are many varieties of Bombyx mori, with more than 300 B. mori varieties in South Korea. Recently, Chung et al. (2015) studied the differences in structural characteristics and properties