Surface modification of polyamide 6.6 fibers by enzymatic hydrolysis

Kanelli, Maria; Vasilakos, Sozon; Ladas, S.; Symianakis, Emmanouil; Christakopoulos, Paul

doi:10.1016/j.procbio.2016.06.022

Cited by 31 publications

(36 citation statements)

References 20 publications

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“…Recently the potential use of violacein in sunscreens has been suggested and investigated ( Suryawanshi et al, 2015 ). Violacein has also been used as a colorant for a variety of natural and synthetic fabrics ( Shirata et al, 2000 ) instead of other chemical colorants for textile dyeing ( Kanelli et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Microbial Production of Violacein and Process Optimization for Dyeing Polyamide Fabrics With Acquired Antimicrobial Properties

et al. 2018

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In the present study, crude bacterial extract containing violacein is investigated for the preparation of antimicrobial polyamide fabrics. The optimal culture conditions of Janthinobacterium lividum (JL) for maximum biomass and violacein production were found to be 25°C, pH 7.0, while the addition of ampicillin of 0.2 mg mL-1 in the small scale increased violacein production 1.3-fold. In scale-up trials, the addition of 1% (v/v) glycerol in a fed-batch bioreactor, resulted in fivefold extracted crude violacein increase with final concentration of 1.828 g L-1. Polyamide 6.6 fabrics were dyed following three different processes; through simultaneous fermentation and dyeing (SFD), by incubating the fabric in the sonicated bacterial culture after fermentation and by using cell-free extract containing violacein. Maximum color change (ΔE) and color strength (K/S) obtained for SFD fabrics were 74.81 and 22.01, respectively, while no alteration of fastness and staining of dye at acid and alkaline perspiration or at water was indicated. The dyed fabrics presented significant antifungal activity against Candida albicans, C. parapsilosis, and C. krusei, as well as antibacterial properties against Escherichia coli, Staphylococcus aureus, and the S. aureus MRSA. We have shown that J. lividum cultures can be successfully used for violacein production and for simultaneous dying of fabrics resulting in dyed fabrics with antimicrobial properties without utilization of organic solvents.

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Section: Introductionmentioning

confidence: 99%

Microbial Production of Violacein and Process Optimization for Dyeing Polyamide Fabrics With Acquired Antimicrobial Properties

et al. 2018

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“…15 Polyamide fibers are relatively hydrophobic because they have insufficient functional groups on their surfaces. 35−38 Several processes have been reported to functionalize nylon by chemical and physical methods. 3,39 Harsh chemical methods include alkaline or acid hydrolysis, can have a negative environmental impact, and cause damage to the fabric structure.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, a previously reported enzymatic modification was employed to improve the hydrophilicity (wettability) of PA6.6 fabric. 38 By introducing additional surface carboxyl and amino groups, polyamide fibers achieved conductivity with fewer deposited bilayers (BLs) than unmodified polyamide. Although enzymatic modification of PA6.6 is well known, it has never been combined with layer-by-layer (LbL) deposition to impart functionality to textiles.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Modification of Polyamide for Improving the Conductivity of Water-Based Multilayer Nanocoatings

et al. 2019

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Enzymatic modification, using a protease from Bacillus licheniformis (Subtilisin A), was carried out on polyamide 6.6 (PA6.6) fabric to make it more amenable to water-based nanocoatings used to impart electrical conductivity. The modified PA6.6 fibers exhibit a smoother surface, increased hydrophilicity due to more carboxyl and amino groups, and larger ζ-potential relative to unmodified polyamide. With its improved hydrophilicity and surface functionality, the modified textile is better able to accept a water-based nanocoating, composed of multiwalled carbon nanotubes (MWCNT) stabilized by sodium deoxycholate (DOC) and poly(diallyldimethylammonium chloride) (PDDA), deposited via layer-by-layer assembly. Relative to unmodified fabric, the enzymatically modified fibers exhibit lower sheet resistance as a function of PDDA/MWCNT-DOC bilayers deposited. This relatively green technique could be used to impart a variety of useful functionalities to otherwise difficult-to-treat synthetic fibers like polyamide.

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“…Physical or chemical modifications have been used to impart fibers some desirable properties. Scientific literature revealed that, different methods have been applied for physical modification of polyamide fibers [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nylon-6 Textile Materials for Special Applications Part1: Polymerization of 2-Methacryloxy Ethyl Trimethyl Ammonium Chloride with Nylon-6 Nonwoven Fabric Using K2S2O8 As Initiator

Abbas¹,

Al-Balakocy²,

Khalil

et al. 2019

Egypt. J. Chem.

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I n the present work, a novel method was designed to develop an efficient and generally applicable technique for the creation of quaternary ammonium groups in nylon-6 macromolecules via polymerization of 2-methacryloxy ethyltrimethyl ammonium chloride (VQAs) in the presence of nylon-6 nonwoven fabrics using potassium persulphate (K 2 S 2 O 8) as initiator. In addition factors affecting the extent and rate of polymerization (Rp) were investigated and the apparent activation energy was calculated. The reaction mechanism was suggested. Characterization of the grafted with PVQAs Nylon-6 nonwoven fabrics was investigated by X-ray, SEM, and FT-IR.

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Surface modification of polyamide 6.6 fibers by enzymatic hydrolysis

Cited by 31 publications

References 20 publications

Microbial Production of Violacein and Process Optimization for Dyeing Polyamide Fabrics With Acquired Antimicrobial Properties

Microbial Production of Violacein and Process Optimization for Dyeing Polyamide Fabrics With Acquired Antimicrobial Properties

Enzymatic Modification of Polyamide for Improving the Conductivity of Water-Based Multilayer Nanocoatings

Preparation of Nylon-6 Textile Materials for Special Applications Part1: Polymerization of 2-Methacryloxy Ethyl Trimethyl Ammonium Chloride with Nylon-6 Nonwoven Fabric Using K2S2O8 As Initiator

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