Stanca (Colie) Maria

@certex.ro

Research and Development National Institute for Textiles and Leather, Division Leather and Footwear Research Institute

Stanca (Colie) Maria


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Scopus Publications

Scopus Publications

  • Changes in collagen matrix of raw hide induced by gamma irradiation
    Maria Stanca, Elena Badea, Carmen Gaidau, Gabriela Elena Ionita, Noemi Proietti, et al.
    Radiation Physics and Chemistry, 2025
  • The Influence of Gamma Radiation on Different Gelatin Nanofibers and Gelatins
    Carmen Gaidau, Maria Râpă, Gabriela Ionita, Ioana Rodica Stanculescu, Traian Zaharescu, et al.
    Gels, 2024
    Gelatin nanofibers are known as wound-healing biomaterials due to their high biocompatible, biodegradable, and non-antigenic properties compared to synthetic-polymer-fabricated nanofibers. The influence of gamma radiation doses on the structure of gelatin nanofiber dressings compared to gelatin of their origin is little known, although it is very important for the production of stable bioactive products. Different-origin gelatins were extracted from bovine and donkey hides, rabbit skins, and fish scales and used for fabrication of nanofibers through electrospinning of gelatin solutions in acetic acid. Nanofibers with sizes ranging from 73.50 nm to 230.46 nm were successfully prepared, thus showing the potential of different-origin gelatin by-products valorization as a lower-cost alternative to native collagen. The gelatin nanofibers together with their origin gelatins were treated with 10, 20, and 25 kGy gamma radiation doses and investigated for their structural stability through chemiluminescence and FTIR spectroscopy. Chemiluminescence analysis showed a stable behavior of gelatin nanofibers and gelatins up to 200 °C and increased chemiluminescent emission intensities for nanofibers treated with gamma radiation, at temperatures above 200 °C, compared to irradiated gelatins and non-irradiated nanofibers and gelatins. The electron paramagnetic (EPR) signals of DMPO adduct allowed for the identification of long-life HO● radicals only for bovine and donkey gelatin nanofibers treated with a 20 kGy gamma radiation dose. Microbial contamination with aerobic microorganisms, yeasts, filamentous fungi, Staphylococcus aureus, Escherichia coli, and Candida albicans of gelatin nanofibers treated with 10 kGy gamma radiation was under the limits required for pharmaceutical and topic formulations. Minor shifts of FTIR bands were observed at irradiation, indicating the preservation of secondary structure and stable properties of different-origin gelatin nanofibers.
  • COLLAGEN AND KERATIN HYDROLYSATES AS VALUABLE ADDITIVES FOR RENEWABLE NEW PRODUCTS IN CIRCULAR ECONOMY
    Leather and Footwear Journal, 2024
  • VALORIZATION OF COLLAGEN AND KERATIN BY-PRODUCTS FROM LEATHER INDUSTRY TO INCREASE THE QUALITY OF PRODUCTION FROM A CHERRY ORCHARD
    Leather and Footwear Journal, 2024
  • Innovative Protein Gel Treatments to Improve the Quality of Tomato Fruit
    Gabriela Luta, Daniela Balan, Maria Stanca, Ovidiu Jerca, Stefana Jurcoane, et al.
    Gels, 2024
    This study aims to establish the effect of biostimulatory protein gels on the quality of tomato. One of the most consumed vegetables, tomato (Lycopersicon esculentum Mill.) is a rich source of healthy constituents. Two variants of protein gels based on bovine gelatin and keratin hydrolysates obtained from leather industry byproducts were used for periodical application on the tomato plant roots in the early stage of vegetation. The gels were characterized by classical physicochemical methods and protein secondary structure was obtained by FTIR band deconvolution. After ripening, tomato was analyzed regarding its content of quality indicators (sugars and organic acids) and antioxidants (lycopene, β-carotene, vitamin C, polyphenols). The results emphasized the positive effects of the protein gels on the quality parameters of tomato fruit. An increase of 10% of dry matter and of 30% (in average) in the total soluble sugars was noted after biostimulant application. Also, lycopene and vitamin C recorded higher values (by 1.44 and 1.29 times, respectively), while β-carotene showed no significant changes. The biostimulant activity of protein gels was correlated with their amino acid composition. Plant biostimulants are considered an ecological alternative to conventional treatments for improving plant growth, and also contributing to reduce the intake of chemical fertilizers.
  • Germination Study of Some Protein-Based Gels Obtained from By-Products from the Leather Industry on Tomato and Pepper Seeds
    Stelica Cristea, Mihaela-Doina Niculescu, Alina Perisoara, Elena Ivan, Maria Stanca, et al.
    Gels, 2024
    This study aimed to evaluate the biostimulant effects of three protein-based gels, GHC 1-B (20% gelatin (GPU-B) obtained by thermal hydrolysis from residual untanned leather and 80% collagen hydrolysates (HCE-B) obtained by alkaline–enzymatic hydrolysis from residual bovine-tanned leather), GHC 2-B (40% keratin hydrolysate (HKU-B) obtained by alkaline–enzymatic hydrolysis from sheep wool + 40% HCE-B + 20% GPU-B), and GHC 3-B (20% GPU-B + 80% hydrolyzed collagen (HPU-B) obtained by thermal and enzymatic hydrolysis from residual untanned leather). A germination study was carried out on pepper and tomato seeds at concentrations of 1%, 3%, and 10%. As a result of the study, it was found that all three protein-based gels showed a stimulatory effect on the tomato seeds at a 1% concentration, where the Gi (germination index) was ˂100%. The GHC 2-B variant had the highest stimulatory effect (Gi-190.23%). Pepper seeds have proven to be more sensitive to the gel’s composition. The concentration at which it proved to be non-inhibitory (Gi–88.29%) was 1% in the case of GHC 2-B. It was found that the presence of hydrolyzed keratin in the composition can be a plus compared to the other two protein gels tested due to its composition, which is richer in phytonutrient compounds (e.g., sulfur molecules).
  • Fish Scale Gelatin Nanofibers with Helichrysum italicum and Lavandula latifolia Essential Oils for Bioactive Wound-Healing Dressings
    Carmen Gaidau, Maria Râpă, Maria Stanca, Mariana-Luiza Tanase, Laura Olariu, et al.
    Pharmaceutics, 2023
    Essential oils are valuable alternatives to synthetic antibiotics that have the potential to avoid the pathogen resistance side effects generated by leather. Helichrysum italicum and Lavandula latifolia essential oils combined with fish scale gelatin were electrospun using a coaxial technique to design new bioactive materials for skin wound dressings fabrication. Fish scale gelatins were extracted from carp fish scales using two variants of the same method, with and without ethylenediaminetetraacetic acid (EDTA). Both variants showed very good electrospinning properties when dissolved in acetic acid solvent. Fish scale gelatin nanofibers with Helichrysum italicum and Lavandula latifolia essential oil emulsions ensured low microbial load (under 100 CFU/g of total number of aerobic microorganisms and total number of yeasts and filamentous fungi) and the absence of Staphylococcus aureus ATCC 6538, Escherichia coli ATCC 10536, and Candida albicans ATCC 1023 as compared to fish scale gelatin without essential oils, which recommends them for pharmaceutical or topical applications. A scratch-test performed on human dermal fibroblasts proved that the biomaterials contributing to the wound healing process included fish scale gelatin nanofibers without EDTA (0.5% and 1%), fish scale gelatin nanofibers without EDTA and Lavandula latifolia essential oil emulsion (1%), fish scale gelatin nanofibers with EDTA (0.6%), and fish scale gelatin nanofibers with EDTA with Helichrysum italicum essential oil emulsion (1% and 2%).
  • Physico-Chemical Changes Induced by Gamma Irradiation on Some Structural Protein Extracts
    Maria Stanca, Carmen Gaidau, Traian Zaharescu, George-Alin Balan, Iulia Matei, et al.
    Biomolecules, 2023
    In this study, the effect of gamma irradiation (10 kGy) on proteins extracted from animal hide, scales, and wool was evidenced by calorimetric (μDSC) and spectroscopic (IR, circular dichroism, and EPR) methods. Keratin was obtained from sheep wool, collagen and bovine gelatin from bovine hide, and fish gelatin from fish scales. The μDSC experiments evidenced that gamma irradiation influences the thermal stability of these proteins differently. The thermal stability of keratin decreases, while a resistance to thermal denaturation was noticed for collagen and gelatins after gamma irradiation. The analysis of the IR spectra demonstrated that gamma irradiation determines changes in the vibrational modes of the amide groups that are associated with protein denaturation, most meaningfully in the case of keratin. As evidenced by circular dichroism for all proteins considered, exposure to gamma radiation produces changes in the secondary structure that are more significant than those produced by UV irradiation. Riboflavin has different effects on the secondary structure of the investigated proteins, a stabilizing effect for keratin and fish gelatin and a destabilizing effect for bovine gelatin, observed in both irradiated and non-irradiated samples. The EPR spectroscopy evidences the presence, in the gamma-irradiated samples, of free radicals centered on oxygen, and the increase in their EPR signals over time due to the presence of riboflavin.
  • Effect of Protein Gel Treatments on Biometric and Biochemical Attributes of Tomato Seedlings in Greenhouse Condition
    Daniela Balan, Gabriela Luţă, Maria Stanca, Ovidiu Jerca, Mihaela Niculescu, et al.
    Agriculture Switzerland, 2023
    Protein hydrolysates are widely used in agricultural crops for improving plant nutrient uptake, growth, yield, and fruit quality. Tomato (Lycopersicon esculentum Mill.) is one of the most important vegetables consumed around the world both for its good taste and rich content in vitamins, minerals, lycopene, and β-carotene. The objective of the present study was to assess the effect of new stimulant products based on protein hydrolysates obtained from animal tissue by-products on tomato seedlings. Given the increased intake of amino acids, it is expected that this treatment will exert beneficial effects on the development of certain vigorous seedlings, representing the premise for obtaining superior tomato plants and the improvement of the production and quality of tomato fruit. Two variants of protein gels based on gelatin and keratin hydrolysates were obtained by processing bovine hide and wool and were used for periodical root applications on tomato seedlings cultivated in a greenhouse. During the experiment, the biometric characteristics of seedlings were measured weekly. The content of photosynthetic pigments, dry weight, sugars, and polyphenols were analyzed, and the antioxidant activity was assessed in the leaves. The research performed showed that applied biostimulant treatments increased the content of photosynthetic pigments by 10%, the content of sugars by 75%, and the content of polyphenols by 16% compared to the control untreated variant. Between the variants of protein gels tested, the best results were obtained by applying a mixture of bovine gelatin and keratin.
  • Collagen and Keratin Hydrolysates to Delay the Setting of Gypsum Plaster
    Constantin Voinitchi, Carmen Gaidau, Fanica Capatana Tudorie, Mihaela Niculescu, Maria Stanca, et al.
    Materials, 2022
    Leather and wool waste represent a high concern due to the low level of valorization and circular economy demands for upcycling of biomass resources. Both biomasses can be easily processed as protein hydrolysates and used as functional additives due to the amphiphilic and tunable properties of collagen and keratin proteins. The chemical, physical, and structural investigations of collagen and keratin hydrolysate properties showed that the chelating abilities due to carboxylic groups can be exploited for gypsum retardant additives. The molecular weights and amino acid compositions of three different hydrolysates showed only slight influences on the setting time of gypsum; all three proteins delayed the setting time of gypsum between 60 and 120 min, as compared to the commercial plaster with a 30 min setting time. Higher molecular weight and more carboxylic active groups showed slight improvements in the setting time of mortars. The improved properties of keratin hydrolysate as compared to low molecular collagen hydrolysate were attributed to foaming and conductive properties. The mechanism of mortar setting delaying through calcium ions complexation by protein hydrolysates was shown by electric conductivity evolution of plasters with and without protein additives over time, supported by foaming properties, amino acid, and functional groups’ composition. Lower bending strength values for the higher concentration of proteins do not reduce the potential to use the protein hydrolysates as retardant additives in mortar fabrication.
  • Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO2/Graphene Oxide Nanocomposites
    Daniela Bala, Iulia Matei, Gabriela Ionita, Dragos-Viorel Cosma, Marcela-Corina Rosu, et al.
    International Journal of Molecular Sciences, 2022
  • Low Release Study of Cefotaxime by Functionalized Mesoporous Silica Nanomaterials
    Dan Eduard Mihaiescu, Daniela Istrati, Alina Moroșan, Maria Stanca, Bogdan Purcăreanu, et al.
    Gels, 2022
  • Bioactivity and Thermal Stability of Collagen–Chitosan Containing Lemongrass Essential Oil for Potential Medical Applications
    Maria Râpă, Traian Zaharescu, Laura Mihaela Stefan, Carmen Gaidău, Ioana Stănculescu, et al.
    Polymers, 2022
  • Bioactive Low Molecular Weight Keratin Hydrolysates for Improving Skin Wound Healing
    Laura Olariu, Brindusa Georgiana Dumitriu, Carmen Gaidau, Maria Stanca, Luiza Mariana Tanase, et al.
    Polymers, 2022
  • PROTEIN EXTRACTS FROM FISH HEAD AS NATURAL FERTILIZER FOR CORN PLANTS
    Mariana Daniela Berechet, Demetra Simion, Maria Stanca, Cosmin Andrei Alexe
    Icams Proceedings of the International Conference on Advanced Materials and Systems, 2022
  • MODELING THE ENCAPSULATION OF TURMERIC IN NANOEMULSIONS
    Demetra Simion, Carmen Gaidau, Mariana Daniela Berechet, Maria Stanca, Rodica Roxana Constantinescu
    Icams Proceedings of the International Conference on Advanced Materials and Systems, 2022
  • ACTIVE PRINCIPLES IN BASIL ESSENTIAL OIL - Ocimum basilicum L. COTTON LININGS WITH ANTIBACTERIAL PROPERTIES
    Mariana Daniela Berechet, Demetra Simion, Rodica Roxana Constantinescu, Maria Stanca, Cosmin Andrei Alexe
    Icams Proceedings of the International Conference on Advanced Materials and Systems, 2022
  • OBTAINING BIOEMULSIONS STRUCTURED AS “NETWORKS” BY INNOVATIVE TECHNOLOGIES
    Demetra Simion, Carmen Gaidău, Gabriela Păun, Maria Stanca, Daniela Berechet
    Leather and Footwear Journal, 2022
  • THE INFLUENCE OF SURFACTANTS IN OBTAINING NEW BYPRODUCTS, FOR AGRICULTURE APPLICATIONS
    Demetra Simion, Carmen Gaidău, Mariana Daniela Berechet, Maria Stanca, Cosmin Alexe, et al.
    Icams Proceedings of the International Conference on Advanced Materials and Systems, 2022
  • Wool keratin hydrolysates for bioactive additives preparation
    Carmen Gaidau, Maria Stanca, Mihaela-Doina Niculescu, Cosmin-Andrei Alexe, Marius Becheritu, et al.
    Materials, 2021
  • Multifunctional leather surface design by using carbon nanotube-based composites
    Maria Stanca, Carmen Gaidau, Cosmin-Andrei Alexe, Ioana Stanculescu, Silvana Vasilca, et al.
    Materials, 2021
  • Gamma irradiation a green alternative for hides and leather conservation
    Carmen Gaidau, Ioana Rodica Stanculescu, Maria Stanca, Mihalis Cutrubinis, Laura Trandafir, et al.
    Radiation Physics and Chemistry, 2021
  • Influence of deficit irrigation on the 'Catherine Sel.1' peach cultivar in the semiarid region of Dobrogea
    L. Septar, C. Moale, C. Gavăt, V.A. Opriță, I. Caplan, et al.
    Acta Horticulturae, 2021
  • Sustainable coated nanostructures based on alginate and electrospun collagen loaded with antimicrobial agents
    Ecaterina Matei, Carmen Gaidau, Maria Râpă, Laura Mihaela Stefan, Lia-Mara Ditu, et al.
    Coatings, 2021
  • Multifunctional leather surfaces coated with nanocomposites through conventional and unconventional methods
    C.A. Alexe, C. Gaidau, M. Stanca, A. Radu, M. Stroe, et al.
    Materials Today Proceedings, 2021