Degradation of sericin (degumming) of Persian silk by ultrasound and enzymes as a cleaner and environmentally friendly process

Abstract Degumming is a surface modification process of natural fibers such as silk. In this paper, the feasibility of degumming with ultrasonic, ultrasonic–soap, and ultrasonic–enzyme (alcalase, savinase, and mixtures of these enzymes) processes as cleaner and environmentally friendly surface modification techniques of Persian silk were investigated. The effectiveness of parameters such as sonication time, soap, ultrasound–enzyme, enzyme concentration, degumming time and enzymes mixture on silk degumming were studied. The evaluation of the data was carried out through the measurement of the weight loss, strength, and elongation of the samples. In addition, the enzymatic treatment improved the properties of silk yarn such as strength and elongation. The scanning electron microscope images were obtained for degummed silk samples. The findings of this research support the potential production of new environmentally friendly textile fibers.

[1]  G. Madras,et al.  Kinetics of the ultrasonic degradation of poly (alkyl methacrylates). , 2009, Ultrasonics sonochemistry.

[2]  Nelson Durán,et al.  Enzyme applications in the textile industry , 2008 .

[3]  A. Fersht.  Structure and mechanism in protein science , 1998 .

[4]  M. Gulrajani,et al.  Comparative evaluation of the various methods of degumming silk , 1994 .

[5]  William T. Richards,et al.  THE CHEMICAL EFFECTS OF HIGH FREQUENCY SOUND WAVES I. A PRELIMINARY SURVEY , 1927 .

[6]  Giuliano Freddi,et al.  Degumming of silk fabric with several proteases. , 2003, Journal of biotechnology.

[7]  Shaobin Wang,et al.  Sonochemical treatment of fly ash for dye removal from wastewater. , 2005, Journal of hazardous materials.

[8]  A. Wilhelm,et al.  Chemical reactions under ultrasound: discrimination of chemical and physical effects , 1994 .

[9]  S. Chand,et al.  Degumming of silk with a fungal protease , 2000 .

[10]  Niyaz Mohammad Mahmoodi,et al.  Numerical finite volume modeling of dye decolorization using immobilized titania nanophotocatalysis. , 2009 .

[11]  V. B. Gupta,et al.  Physical characteristics and structure of Indian silk fibres , 2000 .

[12]  D. Gupta,et al.  Modification of one side of mulberry silk fabric by monochromatic VUV excimer lamp , 2007 .

[13]  G. Freddi,et al.  DEGUMMING OF SILK FABRICS WITH TARTARIC ACID , 2008 .

[14]  T. Ando,et al.  Sonochemical switching of reaction pathways in slid–liquid two-phase reactions , 1984 .

[15]  Jianguo Huang,et al.  Tensile behavior and morphology of differently degummed silkworm (Bombyx mori) cocoon silk fibres , 2006 .

[16]  D. Gupta,et al.  Preparation of a multifunctional mulberry silk fabric having hydrophobic and hydrophilic surfaces using VUV excimer lamp , 2007 .

[17]  F Sadov,et al.  Chemical technology of fibrous materials , 1973 .

[18]  M. Gulrajani,et al.  Degumming of silk with different protease enzymes , 1996 .

[19]  K. Suslick,et al.  Heterogeneous sonocatalysis with nickel powder , 1987 .

[20]  Venkatasubramanian Sivakumar,et al.  Application of power ultrasound in leather processing: an eco-friendly approach , 2001 .

[21]  Niyaz Mohammad Mahmoodi,et al.  Modeling and sensitivity analysis of dyes adsorption onto natural adsorbent from colored textile wastewater , 2008 .

[22]  Niyaz Mohammad Mahmoodi,et al.  Degradation and toxicity reduction of textile wastewater using immobilized titania nanophotocatalysis. , 2009, Journal of photochemistry and photobiology. B, Biology.

[23]  Niyaz Mohammad Mahmoodi,et al.  Laboratory studies and CFD modeling of photocatalytic degradation of colored textile wastewater by titania nanoparticles , 2009 .

[24]  Niyaz Mohammad Mahmoodi,et al.  Bulk phase degradation of Acid Red 14 by nanophotocatalysis using immobilized titanium(IV) oxide nanoparticles , 2006 .

[25]  M. Gulrajani,et al.  Degumming of silk with lipase and protease , 2000 .