Yun Haesung, Kim Moo Kon, Kwak Hyo Won, Lee Jeong Yun, Kim Min Hwa, Lee Ki Hoon
Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea.
Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea; Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, Republic of Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea.
Int J Biol Macromol. 2016 Jan;82:945-51. doi: 10.1016/j.ijbiomac.2015.11.016. Epub 2015 Nov 10.
Silk sericin (SS) can be obtained as a byproduct during the silk fiber process, but its application has been limited due to the brittleness of the SS film. To enhance the flexibility of the SS film, glycerol (Glc) has been added as a plasticizer. The addition of Glc enhanced the elongation property of the SS film when the Glc content was 50-70 wt% of SS. Glc also induced the structural transition of SS from a random coil structure to a β-sheet structure. The inconsistent increase of elongation and β-sheet structure of the SS/Glc film were explained by the content of moisture in the SS/Glc film. The moisture content of the SS/Glc film increased proportionally when the Glc content was higher than 50 wt% of SS, which was the same Glc content range that exhibited the plasticizing effect. Therefore, the plasticizing effect on the SS film may occur not only because of Glc but also because of water. Furthermore, water also contributed to the increase in the β-sheet structure development. Our results suggest that the moisture content in the plasticized protein film may play an important role when the plasticizer has hygroscopic properties.
丝胶蛋白（SS）可在丝纤维加工过程中作为副产品获得，但其应用因SS膜的脆性而受到限制。为提高SS膜的柔韧性，已添加甘油（Glc）作为增塑剂。当Glc含量为SS的50 - 70 wt%时，添加Glc增强了SS膜的伸长性能。Glc还诱导SS从无规卷曲结构转变为β-折叠结构。SS/Glc膜伸长率和β-折叠结构的不一致增加是由SS/Glc膜中的水分含量解释的。当Glc含量高于SS的50 wt%时，SS/Glc膜的水分含量成比例增加，这与表现出增塑效果的Glc含量范围相同。因此，对SS膜的增塑作用可能不仅是因为Glc，还因为水。此外，水也有助于β-折叠结构的增加。我们的结果表明，当增塑剂具有吸湿性时，增塑蛋白膜中的水分含量可能起重要作用。
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