Morphological structure and physicochemical properties of silk fibers from the cocoons of the parasitoid wasp,Cotesia chilonis(Matsumura)(Hymenoptera:Braconidae)
In this paper,the morphological structure,amino acid composition,secondary structure and thermal stability of silk fibers from the cocoons of the parasitoid wasp,Cotesia chilonis(Matsumura)(Hymenoptera:Braconidae)were analyzed by the scanning electron microscopy(SEM),amino acid analysis,Fourier transform infrared spectroscopy(FTIR),X-ray crystallography(XRD)and thermogravimetric analysis(TG).The results showed that the surface of the silk fiber from C.chilonis cocoons was relatively rough,and its diameter was 1.89±0.04 μm.It was mainly composed of elements such as carbon(60.67%),nitrogen(21.17%),and oxygen(17.22%).The protein components of C.chilonis cocoons mainly included aspartic acid/asparagine,serine and alanine.The secondary structure of silk proteins from C.chilonis cocoons was mainly β-sheet,and its peak degradation temperature was 332.27±2.58℃.This study reveals the ultrastructural characteristics and physicochemical properties of silk fibers from C.chilonis cocoons,which provides a basis for expanding the application field of C.chilonis,developing non-worm silk proteins with superior performance,and designing and transforming new silk protein fibers.
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