Papers by Melinda Pruneanu
International Symposium "Technical Textiles - Present and Future", 2022
The very large amounts of solid collagenous waste, resulted as by-products of the leather, slaugh... more The very large amounts of solid collagenous waste, resulted as by-products of the leather, slaughterhouse, fishing and aquaculture industries, lead to worrying environmental pollution, but also to a huge waste of protein resources with unique biological properties. Extraction of collagen from this waste and its conversion into products with high added-value make this biomaterial an important resource for obtaining multifunctional textiles with applications in technical fields such as: medical, pharmaceutical-cosmetics, sports, etc.; moreover, a waste is brought into the circular economy paradigm. This work aims to obtain collagen hydrolysates from chamois leather waste resulted from the buffing operation, which are able to induce some desired, permanent bio-functional properties to textile fabrics, resulted from crosslinking reactions with the functional groups of different textile fibers. Alkaline hydrolysis of the protein-based waste resulted in colloidal solutions with high polydispersity, given by the simultaneous presence of oligopeptide and polypeptide fractions, and amino acids as well. The hydrolysis yield, expressed as hydrolyzed proteins: collagenous substances in the chamois leather ratio, is around 19.04 % (wt/wt). The lyophilized collagenic form, resulted from alkaline hydrolysis, at pH=11 for 14 hours, has the following characteristics: destabilized conformation, functional activity, total dry matter content 82.97%, total ash 4.74%, protein content 90.96%, and other organic matter content 4.3%. The FTIR spectra of collagen hydrolysate demonstrates the presence of important band frequencies for assessing the hydrolysis degree, the damage extent of the conformational structure and the reactivity of the collagen form, which ensure biofunctional properties to the treated textile fibers. The collagen hydrolysate composition and hydrolysis degree are the main factors that impart new functional properties to the textile fibers: increased degree of softness and fine touch, moisture absorption and desorption properties, additionally skin rehydration as compared with clothing made of non-functional textile fibers, antistatic effect and protection against UV rays.
Annals of the University of Oradea: Fascicle of Textiles, Leatherwork, 2018
This paper presents a non-conventional tanning technology, which uses a benzenesulfonate melamine... more This paper presents a non-conventional tanning technology, which uses a benzenesulfonate melamine-formaldehyde resin (BSMF) as pre-tanning agent. BSMF tanning alone can produce white leather, which generates chrome-free leather wastes. A BSMF pre-tanning step can be applied prior to a tanning step with lower chrome offer - 1 % Cr2O3, as compared with the conventional chrome tanning technology, which uses around 2 % Cr2O3. Thus, low chrome-content leather can be obtained, having the organoleptic properties and physico-mechanical behavior similar to those obtained through conventional processing, mainly as it regards the hydrothermal stability. The cross-section of leather pre-tanned with the BSMF resin is less compact as the cross-section of the conventionally chrome tanned leather, which proves that BSMF tannage alone cannot provide leather with the performances acquired by the chrome tannage. Physical deposition of the BSMF product in the interfibrillar voids and envelopment of col...
The aim of this paper is the obtaining of value-added products from the dust resulted from chamoi... more The aim of this paper is the obtaining of value-added products from the dust resulted from chamois leather buffering, a solid waste that raises serious disposal problems, due to its physical state and complex chemical composition. Starting from leather waste, an alkaline hydrolysis was performed followed by the chemical modification of the polypeptyde hydrolysate by polycondensation with dispersions of copolymers of vinyl acetate with acrylic esters and reticulation with glutaraldehyde in order to improve its hydrophobicity. The resulted product can be used/was tested as an ingredient in leather finishing formulations, as binder or carrier agent. In this paper, new finishing mixtures were prepared using pigments and obtained polypeptide hydrolysates as a substitute for casein in pigment pastes. By this method, there were obtained two experimental variants of brown and black pigment pastes which were compared to the pigment pastes with casein binder. Natural grain Box bovine leather ...
This paper presents an alternative technology for bovine leather tanning, by using an oligomeric ... more This paper presents an alternative technology for bovine leather tanning, by using an oligomeric tanning agent based on a benzenesulfonate melamine-formaldehyde resin (BSMF), in an additional pre-tanning step. The proposed technology improves the economic yield of processing, especially in small and medium size tanneries. The cost study was carried out starting from the pre-tanning technology that was performed at pilot scale. Evaluation of total cost showed that, when the novel tanning process is applied, the variable expenses depending on the tannery production capacity can balance the cost increase due to the fixed expenses, if the tanning plant applies the novel process 27 times per year at least, instead of applying the conventional one.
MELINDA PRUNEANU1*, STELIAN SERGIU MAIER1, OLGA NICULESCU2, FLORIN VITAN1, VIORICA DESELNICU2 1“G... more MELINDA PRUNEANU1*, STELIAN SERGIU MAIER1, OLGA NICULESCU2, FLORIN VITAN1, VIORICA DESELNICU2 1“Gh. Asachi” Technical University, Faculty of Textiles, Leather and Industrial Management, 71 A, Dimitrie Mangeron Blvd. 700050 Iaoi, Romania 2 The National Research and Development Institute for Textiles and Leather, Leather and Footwear Research Institute, 93 Ion Minulescu Str., 030215, Bucharest, Romania
Polymers, 2021
The beetroot peels can be a sustainable source of betalains that can dye the wool materials throu... more The beetroot peels can be a sustainable source of betalains that can dye the wool materials through green processes based on low water and energy consumption. Green chemistry in the extraction of betalains from colored food waste/peels from red beetroot involved the use of water as a solvent, without other additives. In order for the extract obtained to be able to dye the wool, it was necessary to functionalize betalains or even the wool. Three types of sustainable functionalizations were performed, with (1) acetic acid; (2) ethanol; and (3) arginine. For each functionalization, the mechanism that can justify dyeing the wool in intense colors was elucidated. The characterization of the extract was performed with the data provided by UV-VIS and HPLC-MS analyses. The characterization of the wool dyed with the extract obtained from the red beetroot peels was possible due to the information resulting from the FTIR and CIELab analyses. The functionalizations of betalains and wool in acid...
Polymers, 2021
This study may open a new way to obtain the coloration of a polymer during functionalization. Two... more This study may open a new way to obtain the coloration of a polymer during functionalization. Two polyacrylonitrile (PAN) polymers in the form of textile fibers (Melana and Dralon L) were subjected to functionalization treatments in order to improve the dyeing capacity. The functionalizations determined by an organo-hypervalent iodine reagent developed in situ led to fiber coloration without using dyes. KIO3 was formed in situ from the interaction of aqueous solutions of 3–9% KOH with 3–9% I2, at 120 °C. The yellow-orange coloration appeared as a result of the transformations in the chemical structure of each functionalized polymer, with the formation of iodinehydrin groups. The degree of functionalization directly influenced the obtained color. The results of the Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), Map and Temogravimetric Analysis (TG) plus Differential Thermal (DTA) analyses indicated the p...
Environmental Engineering and Management Journal, 2006
Brendan Anthony has an established international career as a popular music record producer and is... more Brendan Anthony has an established international career as a popular music record producer and is a confirmed Doctor of Education candidate (Griffith). He is a lecturer in popular music production within the Bachelor of Popular Music at the Queensland Conservatorium, Griffith University, Australia. Brendan's research engages with popular music record production, popular music education, and the relationship between technology and popular music production creative practice.
The present paper aims to investigate a hydrolytic method, feasible to be applied at industrial l... more The present paper aims to investigate a hydrolytic method, feasible to be applied at industrial level, to turn into useful products the Chamois leather wastes, mainly the buffing dust. The efficacy of acid treatments with 0.3, 0.5 and 1.0 % HCl solutions, by autoclaving at 105 °C, for reaction times of 6, 10 and 14 hours, was determined in an attempt to optimize the hydrolysis parameters. Based on the mass balance of performed experiments, the yields of hydrolysis processes were calculated for two of the products that were separated from the final mixture: collagen hydrolysates and fats. Optimal working parameters were: a concentration of 0.5 % HCl, and a duration of 10 hours, by simply boiling in autoclave, at 105 °C. The resulted polypeptides mixture was characterized by chemical (total nitrogen content) and physical-chemical methods (FTIR spectra, EDAX). The recovered greasy matters were purified by water-solvent partition, and the specific physical-chemical indicators were determined. The main advantage of the polypeptide mixtures obtained by Chamois wastes hydrolysis consists in the fact that they are chromium-free, and can be used for a large range of industrial (foaming agents, waste water treatment, chemical auxiliaries, fillers, adhesives, blends with synthetic polymers, concrete mixtures etc.) and agricultural applications (nitrogen and sulfur slow release fertilizers, animal feeding). The grease fraction can be used in leather wet finishing, or can be further chemically modified to produce surfactants. The small amounts of solid residues which resist to the acidic hydrolysis can be used, after neutralization, as additives of concrete mixtures, in producing decorative bricks.
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Revista medico-chirurgicală̆ a Societă̆ţ̜ii de Medici ş̧i Naturaliş̧ti din Iaş̧i
Biomedical applications of collagen are conditioned by its use in a state very close to the nativ... more Biomedical applications of collagen are conditioned by its use in a state very close to the native state, as it concerns conformation and reactivity. Minimal denaturation implies that both the collagen structure and the side amino acid groups are kept intact. The bulk of alterations take place in phases preceding the extraction itself. The authors have established an optimal protocol for preprocessing of young bovine hides, i.e. to obtain a maximum solubilisation yield when a standard proteases-based solubilisation technique was applied. The sequence: unhairing--loosing--cleaning--labilisation of corium tissue was taken in account. The effect of the treating composition upon the deamination degree of the extracted collagen was determined through a binary gradient HPLC technique, on a ProPac WCX-10 analytical column. The optimal range of loosing--cleaning recipe components was found to be between 18 ... 27% dithiotreitol (DDT), 12 ... 20% N-ethyl-acetamide (NEM) and 30 ... 53% iodide...
International Symposium "Technical Textiles - Present and Future", 2022
Textiles is one of the global industries with the highest environmental, economic and social impa... more Textiles is one of the global industries with the highest environmental, economic and social impact. With the increased awareness of preserving the world for future generations, environmental sustainability has become a major concern for the textile industry. Players from all market segments understood the need for change and strive to meet the sustainability demands along the whole value chain, from raw materials through manufacturing to the post-consumer stage. Besides clothing, technical textiles rank amongst the most important driving forces of growth in the textile market. Technical textiles is a high value-added products industry that plays an important role in almost every sphere of social and economic activities, ranging from healthcare or buildings to automotive, protective equipment, sports and leisure etc. The main components of textiles sustainability apply to technical textiles as well: raw materials from renewable sources, innovative eco-friendly production processes in the dyeing and finishing stages, durability, waste recovery and recycling. Particular issues related to technical textiles regard: replacement of high-performance engineered fibers with natural fibers and taking advantage of their biodegradability where possible, higher durability, need for care and maintenance during the service life, need for specialized recycling technologies that facilitate disassembly and separation, ease of removal of incorporated chemicals and additives. Raw materials and processing technologies must demonstrate minimal environmental impact without compromising technical performance of the final product. One other particularity comes from the potential influence of technical textiles upon the environmental impact of certain application areas, like agriculture or packaging. This paper aims to shortly review necessary actions required to minimize the environmental impact of technical textiles, and to investigate their possible influence upon the sustainability of the end-use industries they serve.
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Papers by Melinda Pruneanu