Enzyme treatments for wool and cotton

Heine, Elisabeth; Höcker, Hartwig

doi:10.1111/j.1478-4408.1995.tb00104.x

Cited by 124 publications

(50 citation statements)

References 11 publications

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“…Wool properties like handle, lustre and whiteness have been reported to be enhanced by enzyme-catalyzed reactions (Heine and Hö cker 1995;El-Sayed et al 2001) described the use of the protease papain on pre-treated wool (lipase/sodium monoperoxyphthalate/sodium sulphite) resulting in a shrink-proofed effect. A commercial enzyme preparation combined with an alkaline peroxide treatment followed by application of chitosan biopolymer showed good effects concerning shrink resistance of wool, moreover the wettability and whiteness were enhanced (Jovancic et al 2001(Jovancic et al , 2003 showed that during enzymatic treatments the F-layer of wool was completely removed and the content of cysteic acid was significantly decreased whereas during plasma treatment a partial oxidation of hydrocarbon chains of the F-layer and the formation of cysteic acid residues at the wool surface was detected.…”

Section: Introductionmentioning

confidence: 98%

A new cuticle scale hydrolysing protease from Beauveria brongniartii

et al. 2006

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From a screening for the production of new proteases specific for cuticle scales, Beauveria brongniartii was selected producing an alkaline Ca(++) dependent protease. The purified had a molecular weight of 27 kDa and a pI value of 8.0. Substrate specificities of model substrates (wool with partially removed cuticles treated with SDS) were analyzed by protein release, dissolved organic carbon (DOC) and nitrogen analysis. The C/N ratio of released material turned out to be a good parameter to determine the site of action of proteases on fibres. Compared to other enzymes, the fungal protease preferentially hydrolyzed cuticle scales and has thus a potential for anti-shrinking pre-treatment of wool fabrics.

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Section: Introductionmentioning

confidence: 98%

A new cuticle scale hydrolysing protease from Beauveria brongniartii

et al. 2006

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“…3,4 Current enzymatic processes, especially those using proteases, are difficult to control and are not sufficiently predictable or reproducible on an industrial scale. During such treatments, proteases can easily penetrate into the fiber cortex and cause severe degradation at the macrofibril level and unacceptable tensile strength loss.…”

Section: Introductionmentioning

confidence: 99%

Transglutaminase‐mediated crosslinking of gelatin onto wool surfaces to improve the fabric properties

Cui¹,

Wang²,

Wang³

et al. 2009

J of Applied Polymer Sci

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In this study, transglutaminase (TGase)-mediated crosslinking of gelatin on the surface of wool and its effect on the properties of wool fabric were investigated. For the wool fabric used in this study, gelatin (3 g/ L) treatment for 1 h combined with 20 U/g of fabric microbial TGase reduced the area shrinkage of KMnO 4 -pretreated wool fabric from 6.53 AE 0.06 to 1.92 AE 0.15%, which was more effective than that treated with gelatin alone (in which the area shrinkage was reduced to 4.02 AE 0.10%). At the same time, the tensile strength recovered from 267 AE 2.0 to 335 AE 2.1 N. The antifelting ability of treated wool fabric exhibited better washing durability. Scanning electron micrographs showed that the gelatin material smoothed the wool fiber surface by coating or filling the raised scales of the wool with TGase.

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“…Wool is mainly composed of a recalcitrant protein, keratin, (≈ 97%) and lipids (≈ 1%) (Heine and Höcker, 1995). Due to its high protein content, it can be used as an alternative renewable biomass source for the production of value-added products, via chemical, physicochemical, and microbial processes.…”

Section: Introductionmentioning

confidence: 99%

Dry anaerobic digestion of lignocellulosic and protein residues

2015

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HIGHLIGHTSAD digestion/co-digestion of wool and wheat straw were evaluated with TS contents of between 6 to 30%.Methane yield of wheat straw was highest at TS of 21% and lowest at TS of 30%.Methane yield of wool textile was highest at TS of 13% and lowest at TS of 30%.The addition of enzyme on wool and wheat straw led to improvement in methane yield at TS of 13%.Synergetic effects were observed when these substrates were co-digested. Utilisation of wheat straw and wool textile waste in dry anaerobic digestion (AD) process was investigated. Dry-AD of the individual substrates as well as co-digestion of those were evaluated using different total solid (TS) contents ranging between 6 to 30%. Additionally, the effects of the addition of nutrients and cellulose-or protein-degrading enzymes on the performance of the AD process were also investigated. Dry-AD of the wheat straw resulted in methane yields of 0.081 -0.200 Nm 3 CH4/kgVS with the lowest and highest values obtained at 30 and 21% TS, respectively. The addition of the cellulolytic enzymes could significantly increase the yield in the reactor containing 13% TS (0.231 Nm 3 CH4/kg VS). Likewise, degradation of wool textile waste was enhanced significantly at TS of 13% with the addition of the protein-degrading enzyme (0.131 Nm 3 CH4/kg VS). Furthermore, the co-digestion of these two substrates showed higher methane yields compared with the methane potentials calculated for the individual fractions at all the investigated TS contents due to synergetic effects and better nutritional balance. © 2015 BRTeam. All rights reserved. Kabir et al. / Biofuel Research Journal 8 (2015) [309][310][311][312][313][314][315][316] Please cite this article as: Kabir M.M., Taherzadeh M.J., Sárvári Horváth I. Dry anaerobic digestion of lignocellulosic and protein residues. ARTICLE INFO ABSTRACT

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Enzyme treatments for wool and cotton

Cited by 124 publications

References 11 publications

A new cuticle scale hydrolysing protease from Beauveria brongniartii

A new cuticle scale hydrolysing protease from Beauveria brongniartii

Transglutaminase‐mediated crosslinking of gelatin onto wool surfaces to improve the fabric properties

Dry anaerobic digestion of lignocellulosic and protein residues

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