Stabilisation of sheep wool fibres under air atmosphere: Study of physicochemical changes

Pina, Ana Claudia; Tancredi, Néstor; Ania, Conchi O.; Amaya, Alejandro

doi:10.1016/j.mseb.2021.115115

Cited by 11 publications

(10 citation statements)

References 35 publications

(44 reference statements)

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“…35 The stretching vibration of the disulfide bond (-S-S-) can be ascribed to the existence of a corresponding peak emerging at 513.9 cm −1 . 36 Examining the spectrum of keratin microparticles (Figure 7(b)), the vibration peaks associated with similar bond structures tend to emerge at similar frequencies, but with some reduction in response amplitudes. The attenuation of peak amplitudes can be attributed to the destruction of the crystal regions of the fiber structure by the cryogenic milling process and, hence, ultimately yielding an increase in amorphous regions.…”

Section: Resultsmentioning

confidence: 97%

“…40 The exothermic peaks that appear in the goat fiber DSC graphic at 307 C temperatures are associated with the melting of sulfur cross-bonds and the b-sheet chain containing microfibrillar matrix structures. 36 This peak was not visible in the DSC thermogram of the keratin microparticles. This is due to the transformation of the b-sheet crystal structure into the amorphous form.…”

Section: Thermal Properties Of Goat Fibers and Keratin Microparticlesmentioning

confidence: 93%

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Cryogenic milling-based keratin microparticle production from Anatolian goat fibers and their structural, chemical and thermal properties

Duman

Küçük

2022

Textile Research Journal

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Fibers procured from Anatolian goat ( Capra aegagrus hircus) furs were converted into keratin microparticles by the cryogenic milling method. Single-stage mechanical milling with a 2.5 h optimal grinding time was sufficient enough to generate the desired high-quality microparticles. No chemical solvents were utilized during the production process of keratin microparticles. Structural, chemical and thermal properties of keratin microparticles were assessed using particle size analyzer, stereo microscope, Brunauer–Emmett–Teller™ surface analyzer, field emission scanning electron microscope, X-ray diffractometer, attenuated total reflection Fourier transform infrared spectroscopy, thermogravimetric analyzer and differential scanning calorimetry methods. According to the characterization results, microparticles with amorphous structure in micro size could be produced without any agglomeration during the milling process. Goat farming is usually for dairy products and their fibers have very limited use in the textile industry because of their flat structure. Therefore, the conversion of goat fibers into another product that can be used in other industrial areas is expected to contribute significantly to a sustainable economy.

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Section: Resultsmentioning

confidence: 97%

Section: Thermal Properties Of Goat Fibers and Keratin Microparticlesmentioning

confidence: 93%

Cryogenic milling-based keratin microparticle production from Anatolian goat fibers and their structural, chemical and thermal properties

Duman

Küçük

2022

Textile Research Journal

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“…Wool is a natural fiber of animal origin, and thus presents a high protein content (keratin), which has a polypeptide chain with amino acid side chains (cystine, cysteine, cysteic acid, and methionine). 19 Among the selected feedstock, wool has the highest sulfur content (2.7 wt%) and the lowest ash content (1.2 wt%).…”

Section: Resultsmentioning

confidence: 97%

Characterization of sulfur and chlorine behavior during pyrolysis of biomass and waste

Braidy,

Valin,

Patisson

2023

Sustainable Energy Fuels

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“…This substrate also had the highest EC (6.24 mS). Unfortunately, the nitrogen content in the substrate was not investigated in the present study, but other sources state that raw sheep wool is its rich source (Böhme et al, 2012;Dannehl et al, 2015;Pina et al, 2021). This could be the reason the highest nitrate content in sheep wool.…”

Section: Nitrate Contentmentioning

confidence: 87%

“…When searching for an alternative substrate for hydroponic crops, some authors focussed on waste materials such as compost from vegetable waste or groceries (Mazuela et al, 2005;Moschou et al, 2022), recycled plastics and almond shells (Kennard et al, 2020), sheep wool (Böhme et al, 2008;Dannehl et al, 2015;Jug, 2018) or rice hulls (Sambo et al, 2008;Buck and Evans, 2010). Other authors used substrate materials from renewable sources such as hemp (Dannehl et al, 2015;Li et al, 2021), wood materials as fibre, bark or sawdust (Allaire et al, 2004;Muro et al, 2004;Dorais et al, 2007;Maboko and Modise, 2018;Rahman et al, 2018) or coconut husk, which is presented in the literature as coir, coco fibre or coco peat (Böhme et al, 2008;Suvo et al, 2017). In the present study, three organic substrates, namely, coco peat, wood fibre and sheep wool, were used for testing in the hydroponic system.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of alternative substrates for hydroponics based on biological parameters of leaf lettuce (Lactuca sativa L.) and its stress response

Ferby

Kopta

Komorowska

et al. 2023

Folia Horticulturae

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The study focusses on alternative substrates with the potential to replace common substrates, such as mineral wool and perlite, as the influence of these on ecosystems and resources is being debated. To this aim, wood fibre, sheep wool and coco peat substrates were selected for testing. Leaf lettuce (Lactuca sativa L. ‘Lisboa’) is taken as the model crop for the evaluation of alternative substrates. The closed hydroponic system ebb and flow with growing in pots was used for the experiment. The parameters of the nutrient solution were EC 1.5–2 mS and pH 6–7. Biological parameters, content of nitrates, plant stress indicators, antioxidant activity (AA) as % scavenging of DPPH (AA), glutathione (GSH), ascorbate peroxidase (APX), total phenol content (TPC) and the content of chosen elements in the drain from substrates were evaluated. According to the biomass production of lettuce, the substrates can be ranked from the lowest as follows: sheep wool < wood fibre < mineral wool < perlite < coco peat. The levels of GSH and APX did not affect AA. The TPC showed the greatest effect on AA and the stress response in general. The nitrate content ranged between 426 and 686 mg · kg–1 of fresh mass. Instead of mineral wool and perlite, coco fibre could be a promising alternative organic substrate for lettuce production in the ebb and flow hydroponics system. Wood fibre and sheep wool still have unresolved circumstances regarding their physical and chemical parameters.

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Stabilisation of sheep wool fibres under air atmosphere: Study of physicochemical changes

Cited by 11 publications

References 35 publications

Cryogenic milling-based keratin microparticle production from Anatolian goat fibers and their structural, chemical and thermal properties

Cryogenic milling-based keratin microparticle production from Anatolian goat fibers and their structural, chemical and thermal properties

Characterization of sulfur and chlorine behavior during pyrolysis of biomass and waste

Evaluation of alternative substrates for hydroponics based on biological parameters of leaf lettuce (Lactuca sativa L.) and its stress response

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