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

Mahmoodi, Niyaz Mohammad; Arami, Mokhtar; Mazaheri, Firoozmehr; Rahimi, Shahram

doi:10.1016/j.jclepro.2009.10.003

Cited by 117 publications

(57 citation statements)

References 20 publications

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“…Natural raw silk is composed primarily of fibroin (62.5-67%) and sericin (22-25%; Mahmoodi et al 2010). Sericin is a fibrous protein that binds the fibroin fibres together; it renders the raw silk harsh and stiff and reduces the effectiveness of dye uptake by the material.…”

Section: Silk Degummingmentioning

confidence: 99%

“…and many appeared to be low in specificity towards sericin (Freddi et al 2003). The use of proteases combined with ultrasonic treatment is found to improve the effectiveness of the degumming process and improve the properties of silk yarn such as strength and elongation (Mahmoodi et al 2010). The application of a more substrate specific enzyme, such as keratinase from B. subtilus (Cai et al 2008) that does not hydrolyse silk, may further improvement of the process.…”

Section: Silk Degummingmentioning

confidence: 99%

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Microbial keratinases: characteristics, biotechnological applications and potential.

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2016

The Handbook of Microbial Bioresources

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Keratinases are a group of proteolytic enzymes that can catalyse the cleavage and hydrolysis of the highly stable and fibrous proteins: keratins. A diverse range of microorganisms, including fungi, actinomycetes and bacteria, have been reported to produce keratinases that have biotechnological applications and potential. These keratinases have been usefully applied in agricultural, pharmaceutical, leather and textile processes as well as within environmentally friendly waste management solutions. Potential uses of keratinases include the fields of biomedicine, cosmetics, biological control and the generation of green energy. Herein we aim to provide an overview of the properties of this group of versatile enzymes, including the mechanisms of keratin degradation. The diversity of microbial sources of keratinases is discussed and the optimisation of keratianse production examined.We conclude with an assessment of the established biotechnological applications of keratinases in different industries and current research that highlights other promising potential uses.

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Section: Silk Degummingmentioning

confidence: 99%

Section: Silk Degummingmentioning

confidence: 99%

Microbial keratinases: characteristics, biotechnological applications and potential.

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2016

The Handbook of Microbial Bioresources

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“…Traditionally, degumming is carried out by soaking the silk fabric in a solution of 3-5 g/l Marseilles (olive oil soap) for 6 h at 40-50 °C and then boiled off for 2-6 h in a solution of 8-10 g/l soap at 90-95 °C [18]. It produces effluent and degumming by chemical-free microwave treatment, alkaline electrolyzed water, enzymes, organic acid, plasma treatment, and ultrasound have been investigated as an eco-friendly degumming process [19][20][21][22][23]. Electrolyzed water at pH 11.5 achieved 25 % removal of sericin, but caused tensile strength loss due degradation of fiber.…”

Section: Silk Processingmentioning

confidence: 99%

Sustainable Processing of Luxury Textiles

Hassan

2015

Handbook of Sustainable Luxury Textiles and Fashion

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Luxury textile industries are in a big dilemma. On one hand, they need to uplift their brand value, and on the other hand they need to support sustainability as the consumers of luxury textiles are rich and literate. They are particularly more concerned about the sustainability issues. Like those of other textile industries, the luxury textile industries are under intense consumer as well as stakeholder scrutiny. The demands of consumers are not only limited to the marketed products being safe, but also that they are processed sustainably under safe and humane conditions. The sustainability issues are based on four main pillars: environmental, social, ethical and economic. The recent recession showed that weakening of social and economic pillars affect the environmental and ethical pillars. When recession starts to have an effect, the environmental and ethical pillars become neglected. In this chapter, what type of fibers are used in luxury textiles, what is meant by 'sustainability' and why it is important in luxury textile industry, how it is measured and the future trends to make luxury textile processing sustainable are discussed.

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“…Conventional degumming process, with soap and alkalis is effective to remove sericin, but promote the hydrolysis of the sericin chain structure, losing potential properties, while the soap removal from sericin solution is hard and expensive [13]. Sericin extraction by urea with 2-mercaptoetahnol showed high efficiency, however, a cost-consuming step of dialysis is necessary to purify the sericin solution before sericin application [14], [15].…”

mentioning

confidence: 99%

“…Sericin extraction by urea with 2-mercaptoetahnol showed high efficiency, however, a cost-consuming step of dialysis is necessary to purify the sericin solution before sericin application [14], [15]. Enzymatic degumming can be effective to remove sericin from silk cocoon; however, it is an expensive process and promotes the specific proteolytic hydrolysis of the primary sericin chain structure, which causes a molecular weight reduction [5], [13].…”

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confidence: 99%

High Molecular Sericin from Bombyx mori Cocoons: Extraction and Recovering by Ultrafiltration

Gimenes¹,

Silva²,

Vieira³

et al. 2014

IJCEA

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Abstract-The present study focus on sericin extraction process from Bombyx mori cocoons using water in absence of chemical additives under different physical conditions aiming to obtain high molecular weight sericin. Separation and fractionation of sericin proteins to obtain high molecular weight material was also carried out using ultrafiltration process at different operating modes: batch, diafiltration and batch with back flushing water pulse. The molecular weight of extracted sericin protein using pure water showed in general a size distribution varying from 20 up to 400 kDa, with major peaks between 200 kDa and 100 kDa and peaks with fraction of sericin lower than 100 kDa, depending on conditions used in the extraction and concentration. The results demonstrated viability to separate sericin fractions having molecular size higher than 50 kDa, using the ultrafiltration process with 50 kDa cut-off membrane, however, a flux decline above 90 % was detected independent of operating mode. Increasing the concentration factor from 2 to 4 promotes the permeation of sericin molecules of high molecular weight, reducing the rejection coefficient of 71.1 % to 60.4 %.

show abstract

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

Cited by 117 publications

References 20 publications

Microbial keratinases: characteristics, biotechnological applications and potential.

Microbial keratinases: characteristics, biotechnological applications and potential.

Sustainable Processing of Luxury Textiles

High Molecular Sericin from Bombyx mori Cocoons: Extraction and Recovering by Ultrafiltration

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