Stazione Sperimentale per la Seta

Milano, Italy

Stazione Sperimentale per la Seta

Milano, Italy
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Patent
Stazione Sperimentale Per La Seta, MASCIONI S.p.A., Centro Tessile Cotoniero e Abbigliamento S.p.A. and Cittadini S.p.A. | Date: 2012-04-25

The present invention relates to textiles endowed with bioactive protection against air or water borne toxic chemicals such as pesticides, nerve agents, phenols, polycyclic aromatic hydrocarbons, etc. More specifically, the object of the invention is a textile material carrying immobilized biocatalysts able to actively degrade toxic chemicals adsorbed onto it. The textile material of the invention can be used to manufacture bioactive interlining element of protective garments or it may, but not exclusively, be used was the bioactive layer of filter masks, gloves and other protective devices. In particular, the present invention relates to a bioactive textile material comprising (i) a textile support; (ii) a bioactive layer either on one or both aides of the said textile support, the bioactive layer comprising a nanostructured xerogel film which comprises an immobilized bloactive enzyme.


Patent
Centro Tessile Cotoniero e Abbigliamento S.p.A., Felli Color S.p.A., Stazione Sperimentale Per La Seta and Linificio e Canapificio Nazionale S.p.A. | Date: 2012-04-25

The present invention describes a process designed to integrate biomarkers into textile substrates. The invention is directed to any kind of textile materials in form of loose fibres, tops, tow, sliver, yarn, fabric (woven, knitted, nonwoven, braided, etc.), garment. Textile materials can be made of natural or man-made fibres (artificial, synthetic) or their blends. The biomarkers of the invention are proteins, preferably endowed with biocatalytic activity. The biomarker carrier media include aqueous solutions of textile auxiliaries and finishes. The presence of the biomarker is detected by means of specific activity tests by applying the concept of biosensing. Visual inspection is generally sufficient to authenticate the biomarker.


Marelli B.,Polytechnic of Milan | Alessandrino A.,Polytechnic of Milan | Fare S.,Polytechnic of Milan | Freddi G.,Stazione Sperimentale per la Seta | And 2 more authors.
Acta Biomaterialia | Year: 2010

Processing silk fibroin (SF) by electrospinning offers a very attractive opportunity for producing three-dimensional nanofibrillar matrices in tubular form, which may be useful for a biomimetic approach to small calibre vessel regeneration. Bypass grafting of small calibre vessels, with a diameter less than 6 mm, is performed mainly using autografts, like the saphenous vein or internal mammary artery. At present no polymeric grafts made of SF are commercially available, mainly due to inadequate properties (low compliance and lack of endothelium cells). The aim of this work was to electrospin SF into tubular structures (Ø = 6 mm) for small calibre vessel grafting, characterize the morphological, chemico-physical and mechanical properties of the electrospun SF structures and to validate their potential to interact with cells. The morphological properties of electrospun SF nanofibres were investigated by scanning electron microscopy. Chemico-physical analyses revealed an increase in the crystallinity of the structure of SF nanofibres on methanol treatment. Mechanical tests, i.e. compliance and burst pressure measurements, of the electrospun SF tubes showed that the inner pressure to radial deformation ratio was linear for elongation up to 15% and pressure up to 400 mm Hg. The mean compliance value between 80 and 120 mm Hg was higher than the values reported for both Goretex® and Dacron® grafts and for bovine heterografts, but still slightly lower than those of saphenous and umbilical vein, which nowadays represent the gold standard for the replacement of small calibre arteries. The electrospun tubes resisted up to 575 ± 17 mm Hg, which is more than four times the upper physiological pressure of 120 mm Hg and more than twice the pathological upper pressures (range 180-220 mm Hg). The in vitro tests showed a good cytocompatibility of the electrospun SF tubes. Therefore, the electrospun SF tubes developed within this work represent a suitable candidate for small calibre blood vessel replacement. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Patent
Polytechnic of Milan and Stazione Sperimentale Per La Seta | Date: 2010-07-28

The invention concerns a silk fibroin weave structure comprising a concentric tubular outer sheath and an inner core, wherein said sheath is a woven fabric with interlaced loop and said core is a woven fabric with interlaced loop or is braided using a braiding machine. The silk fibroin used to weave the structure of the invention is a silk yarn with a linear density comprised of between approx. 40 den and approx. 640 den, preferably, the linear density is approx. 80 den or approx. 320 den. The core of the structure has a mean pore area comprised of between 0.001 and 2.000 mm^(2), while the outer sheath has a mean pore area comprised of between 0.005 and 15.000 mm^(2)_(.) The structure of the invention is used for the in vivo or in vitro regeneration of ligaments, particularly the anterior cruciate ligament, tendons, muscles and blood vessels. Furthermore, the structure promotes in vivo and in vitro cell adhesion and proliferation.


Donelli I.,Stazione Sperimentale per la Seta | Freddi G.,Stazione Sperimentale per la Seta | Nierstrasz V.A.,Ghent University | Taddei P.,University of Bologna
Polymer Degradation and Stability | Year: 2010

This study was aimed at comparatively investigating the hydrolysis of crystalline and amorphous poly-(ethylene terephthalate) films by alkali and cutinase. Changes of surface properties were investigated by FTIR spectroscopy (ATR mode). The A1341/A1410 and I1120/I 1100 absorbance ratios, and the full width at half maximum of the carbonyl stretching band (FWHM1715) were used to evaluate the polymer crystallinity and its changes upon hydrolysis. The effect of different treatments on chain orientation was evaluated by calculating R ratios of appropriate bands. The spectroscopic indexes showed that both alkali and enzyme treatments induced structural and conformational rearrangements with a consequent increase in crystallinity in both amorphous and crystalline films. The crystalline PET film was modified more strongly by alkali than by cutinase, while the opposite occurred for the amorphous one. The trend of the water contact angle (WCA) clearly indicates that alkali is more effective than cutinase in enhancing hydrophilicity of PET films and that the effect is stronger on amorphous than on crystalline films. The values of WCA correlate well with the FTIR indexes calculated from the spectra of hydrolyzed crystalline PET films. The mechanism of the surface hydrolysis of PET by alkali and cutinase is discussed. © 2010 Elsevier Ltd. All rights reserved.


Cernuto G.,University of Insubria | Masciocchi N.,University of Insubria | Cervellino A.,Paul Scherrer Institute | Colonna G.M.,Stazione Sperimentale per la Seta | And 2 more authors.
Journal of the American Chemical Society | Year: 2011

Nanocrystalline TiO 2 samples, prepared forsmart textiles applications by the sol-gel technique in acidic or basic media, have been characterized by synchrotron X-ray powder diffraction and total scattering methods based on a fast implementation of the Debye function and original algorithms for sampling interatomic distances. Compared to the popular and widely used Rietveld-based approaches, our method is able to simultaneously model both Bragg and diffuse contributions and to quantitatively extract either sizes and size distribution information from the experimental data. The photocatalytic activity of the investigated samples is here systematically correlated to the average sizes and size distributions of anisotropically shaped coherent domains, modeled according to bivariate populations of nanocrystals grown along two normal directions. © 2011 American Chemical Society.


Marelli B.,McGill University | Ghezzi C.E.,McGill University | Alessandrino A.,Stazione Sperimentale per la Seta | Barralet J.E.,McGill University | And 2 more authors.
Biomaterials | Year: 2012

Silk fibroin (SF) is extensively investigated in osteoregenerative therapy as it combines extraordinary mechanical properties and directs calcium-phosphate formation. However, the role of the peptidic fractions in inducing the protein mineralization has not been previously decoded. In this study, we investigated the mineralization of fibroin-derived polypeptides (FDPs), which were obtained through the chymotryptic separation of the hydrophobic crystalline (Cp) fractions and of the hydrophilic electronegative amorphous (Cs) fractions. When immersed in simulated body fluid (SBF), only Cs fragments demonstrated the formation of carbonated apatite, providing experimental evidence that the mineralization of SF is dictated exclusively by its electronegative amino-acidic sequences. The potential of Cs to conceptually mimic the role of anionic non-collagenous proteins in biomineralization processes was investigated via their incorporation (up to 10% by weight) in bulk osteoid-like dense collagen (DC) gels. Within 6 h in SBF, apatite was formed in DC-Cs hybrid gels, and by day 7, carbonated hydroxylapatite crystals were extensively formed. This accelerated 3-D mineralization resulted in a nine-fold increase in the compressive modulus of the hydrogel. The tailoring of the mineralization and mechanical properties of hydrogels through hybridization with FDPs could potentially have a significant impact on cell delivery and bone regenerative medicine. © 2011 Elsevier Ltd.


Patent
Stazione Sperimentale Per La Seta and Cittadini S.p.A. | Date: 2012-07-18

The present invention relates to textile materials endowed with antifouling activity against organisms responsible for the biofouling of surfaces immersed in aquatic environments such as bacteria, protozoa, algae and invertebrates. More specifically, the object of the invention is a textile material in the form of yarn, net, woven, knitted and nonwoven fabrics that during its use has to remain submerged under sea water for variable lengths of time. Typical but not exclusive examples relevant for the invention are ropes, aquaculture nets, cover materials and other culture bags. In particular, the present invention relates to a textile material endowed with antifouling properties, as obtainable by coating at least one side of a textile support with at least one layer of an antifouling composition containing a cross-linkable polymer, drying the said antifouling composition on the said textile support and subjecting the said antifouling composition to cross-linking conditions, wherein the said antifouling composition comprises an antifouling effective amount of at least one hydrolase enzyme.


Patent
University of Milan Bicocca and Stazione Sperimentale Per La Seta | Date: 2011-02-23

The present invention relates to a method for the working of woven and non-woven fabrics, yarns, natural and polymeric fibres, and inorganic fibres and films, glass and alcantara. In particular, it relates to a method comprising at least one treatment stage with cold plasma, realised using a source of plasma that originates particles that are substantially neutral, wherein said plasma is produced at a pressure approximately the same as the atmospheric pressure, and said plasma source originating substantially neutral particles is obtained through pulsed plasma.


Brancatelli G.,University of Bergamo | Colleoni C.,University of Bergamo | Massafra M.R.,Stazione Sperimentale per la Seta | Rosace G.,University of Bergamo
Polymer Degradation and Stability | Year: 2011

The aim of this work was to prepare hybrid organic-inorganic silica thin films to provide cotton fabrics with flame retardant properties and to investigate the films' influence on the thermal and burning behavior of the treated samples. The fabrics were modified with three different sols in order to study the effect of pure silica sol-gel precursor, γ- aminopropyltriethoxysilane (APTES), and that of the hybrid sols consisting of the APTES and the phosphorus compound diethylphosphite. Furthermore, in order to improve the cross-linking degree and the phosphorus-nitrogen synergistic effect on flame retardancy of the P-doped silica thin film the melamine-based resin was added in the third sol. To evaluate the chemical structure of the coating material, pure xerogels of the treatment solutions were applied to glass slides and tested by ATR FT-IR spectroscopy. The cotton fabrics were impregnated with the sols by a padding-squeezing process and then dried. Thermal behavior of the treated cotton samples was investigated by thermogravimetric/differential scanning calorimetry analysis (TGA-DTG/DSC) and compared to the untreated one. The flame retardancy was tested according to the ASTM D 1230 standard method. The results showed a substantial enhancement of char-forming properties and flame retardancy for the fabrics modified with the thin films. © 2011 Elsevier Ltd. All rights reserved.

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