Yazar "Dinu-Pîrvu, Cristina-Elena" seçeneğine göre listele

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    HAIR MASKS BASED ON KERATIN AND COLLAGEN
    (Inst. Nat. Cercetare-Dezvoltare Text. Pielarie, 2022) Albu-Kaya, M?d?lina Georgiana; Ghica, Mihaela-Violeta; Dinu-Pîrvu, Cristina-Elena; Popa, L?cr?mioara; D?nil?, Elena; Chelaru, Ciprian; Anu?a, Valentina
    The study aimed to develop and characterize some O/W emulsions, designed as nourishing hair masks. The cosmetic formulations based on collagen hydrolysate, keratin, and natural ingredients (essential and vegetable oils) were organoleptically evaluated. The pH, morphological, superficial, and rheological properties were assessed as a physicochemical background. The rheological measurements were performed at 23 and 32°C, and the shear stress versus shear rate ascending and descending rheograms were built, together with the flow profiles of viscosity as a function of shear rate. The cosmetic emulsions were stable at temperature variation and the pH values were considered physiologically acceptable for the skin, indicating that formulations can be safely applied for cosmetic purposes. Results from the optical microscopy analysis showed that all emulsions presented a creamy and non-greasy appearance. The superficial profiles, quantified through contact angle at solid/liquid interface, were specific for hydrophilic formulations. The emulsions showed pseudoplastic and thixotropic behavior, facilitating the formulations’ flow and the topical application. The Power law model was used to quantify the flow properties, and the thixotropic analysis was conducted using particular descriptors, namely thixotropic area, and thixotropic index. The designed emulsions presented appropriate physicochemical properties for cosmetic applications in hair care. © 2022 Toate drepturile asupra acestei edi?ii sunt rezervate editorilor.
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    RHEOLOGICAL CHARACTERIZATION OF SOME CELLULOSE DERIVATIVES-BASED HYDROGELS
    (Inst. Nat. Cercetare-Dezvoltare Text. Pielarie, 2022) Tudoroiu, Elena-Emilia; Ghica, Mihaela-Violeta; Albu-Kaya, M?d?lina Georgiana; Dinu-Pîrvu, Cristina-Elena; Popa, L?cr?mioara; Anu?a, Valentina; Velescu, Bruno ?tefan
    Cellulose derivatives serve as a feasible alternative to the insoluble natural cellulose considering their high solubility in the most frequent organic solvents and particularly in water. Alongside this advantageous physical property, cellulose derivatives exhibit proper biocompatibility, biodegradability, thermo-gelling nature, and mechanical characteristics. Due to their high hydrophilicity, these biopolymers possess a great capacity to absorb large amounts of water into their structural chains, forming hydrogels with multiple biomedical applications, such as wound healing. Therefore, the main objective of this present work was to assess the rheological properties of some cellulose derivatives-based hydrogels. For this purpose, different commercial varieties of methylcellulose and hydroxyethylcellulose, two of the most used cellulose derivatives, were dispersed in water and stirred continuously until a clear and transparent hydrogel was formed. Depending on the quantities used of each biopolymer, hydrogels of different concentrations were obtained, from 3 to 20%. The topical semisolid systems were rheologically investigated at 23°C using a rotational viscometer and the rheograms of the experimental data were drawn. The hydrogels showed a non-newtonian pseudoplastic behaviour, which represents a requested requirement for topical semisolid systems, both in terms of conditioning, but also of spreading on the skin surface, improving the topical administration. © 2022 Toate drepturile asupra acestei edi?ii sunt rezervate editorilor.