For the value-added utilization of discarded agricultural wastes,corn silk( CS) obtained abundantly in the farming field has been tested as a new source of cellulosic materials. Cellulose microfibril( CMF) and cellulo...For the value-added utilization of discarded agricultural wastes,corn silk( CS) obtained abundantly in the farming field has been tested as a new source of cellulosic materials. Cellulose microfibril( CMF) and cellulose nanocrystal( CNC) were isolated from CS by ethanol and alkali pretreatments,and acid hydrolysis.The characterization was performed by scanning electron microscopy( SEM),Fourier transform infrared spectroscopy( FT-IR),X-ray diffraction( XRD), thermogravimetric analysis( TGA) and transmission electron microscopy( TEM). After chemical pretreatments,the lignin,hemicelluloses and other non-structural components were removed. The degree of crystallinity and thermal stability of CMF and CNC were increased compared to raw CS. The crystallinity indexes of CS,CMF and CNC were 45. 90%,65. 77%,and 73. 75% respectively. The CNC was flat and rod like shape with diameter and aspect ratio range of 13. 96-33. 69 nm and 34. 34-23. 02 nm respectively. The nanocrystals had an alternative potential to be used as reinforcing filler for bio-nanocomposites preparation.展开更多
A new sustainable antibacterial surgical suture coated by chitosan-levofloxacin microcapsule(CLM) was developed and characterized in this work.The CLM with a mean diameter of 1.0-10.0 μm was prepared by emulsion solv...A new sustainable antibacterial surgical suture coated by chitosan-levofloxacin microcapsule(CLM) was developed and characterized in this work.The CLM with a mean diameter of 1.0-10.0 μm was prepared by emulsion solvent evaporation method and applied to the silk surgical suture as the main element of antibacterial coating by dipping-rolling coating method.By the agar diffusion method,high anti-microbial efficacy for up to 4 d was observed against either Staphylococcus aureus(S.aureus) or Escherichia coli(E.coli).And the mechanical properties of the new antibacterial suture including knot mechanical properties,bending stiffness,and suture-to-suture friction properties were characterized fulfilling the requirements of surgical sutures,and were superior to the references.展开更多
基金Science&Technology Commission of Shanghai Municipality (No. 20DZ2254900)Municipal Public Welfare Research Project from Jiaxing,Zhejiang Province (No. 2022AY10001)Open Project Program of Jiaxing Key Laboratory of Virus-Related Infectious Diseases.
基金Fundamental Research Funds for the Central Universities,China(Nos.16D310102,2232018A3-04)
文摘For the value-added utilization of discarded agricultural wastes,corn silk( CS) obtained abundantly in the farming field has been tested as a new source of cellulosic materials. Cellulose microfibril( CMF) and cellulose nanocrystal( CNC) were isolated from CS by ethanol and alkali pretreatments,and acid hydrolysis.The characterization was performed by scanning electron microscopy( SEM),Fourier transform infrared spectroscopy( FT-IR),X-ray diffraction( XRD), thermogravimetric analysis( TGA) and transmission electron microscopy( TEM). After chemical pretreatments,the lignin,hemicelluloses and other non-structural components were removed. The degree of crystallinity and thermal stability of CMF and CNC were increased compared to raw CS. The crystallinity indexes of CS,CMF and CNC were 45. 90%,65. 77%,and 73. 75% respectively. The CNC was flat and rod like shape with diameter and aspect ratio range of 13. 96-33. 69 nm and 34. 34-23. 02 nm respectively. The nanocrystals had an alternative potential to be used as reinforcing filler for bio-nanocomposites preparation.
文摘A new sustainable antibacterial surgical suture coated by chitosan-levofloxacin microcapsule(CLM) was developed and characterized in this work.The CLM with a mean diameter of 1.0-10.0 μm was prepared by emulsion solvent evaporation method and applied to the silk surgical suture as the main element of antibacterial coating by dipping-rolling coating method.By the agar diffusion method,high anti-microbial efficacy for up to 4 d was observed against either Staphylococcus aureus(S.aureus) or Escherichia coli(E.coli).And the mechanical properties of the new antibacterial suture including knot mechanical properties,bending stiffness,and suture-to-suture friction properties were characterized fulfilling the requirements of surgical sutures,and were superior to the references.
