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Anicuta Stoica-Guzun Marta Stroescu Traian Zaharescu Elena Grosu 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,265(1):434-438
Ionizing radiation is an effective energetic source for polymer surfaces modification in order to obtain transdermal systems with different controlled release properties. In this work, gamma rays have been applied to induce changes in bacterial cellulose membranes. Permeation of drug (tetracycline) was theoretically and experimentally investigated starting from the effect of γ-irradiation on membranes permeability. Release and permeation of drug from irradiated and non-irradiated membranes have been performed using a diffusion cell. 相似文献
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Alina Culetu Anicuta Stoica-Guzun Denisa Eglantina Duta 《International Journal of Food Science & Technology》2021,56(1):126-137
This study investigated the effect of six fats (margarine, butter, lard-LAR, refined palm oil-RPO, refined palm oil with stearin-RPOS, hydrogenated palm oil-HPO) with different solid fat content (SFC) on gluten-free oat dough and cookie properties. RPOS and HPO had the highest SFC. RPO dough was the softest, whereas HPO was the hardest one. Dough hardness was correlated with SFC (r = 0.87). Dough stickiness was positively correlated with dough hardness (r = 0.92). Dough hardness influenced the breaking force of the cookies (r = 0.79). HPO were the hardest cookies. Oscillatory test revealed that HPO dough was the stiffest as well as presented a higher rigidity compared to the other samples as showed by the creep tests. LAR cookies were the darkest, while HPO were the lightest. SFC of fats is the most important composition parameter which influences thermal, textural and rheological properties of the oat dough. 相似文献
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Marta Stroescu Anicuta Stoica-Guzun Sorin Ion Jinga Tanase Dobre Iuliana Mihaela Jipa Loredana Mihaela Dobre 《Korean Journal of Chemical Engineering》2012,29(9):1216-1223
Calcium carbonate was deposed on bacterial cellulose (BC) never-dried membranes in the presence of different concentrations of sodium dodecyl sulfate (SDS) and cetyl trimethylammonium bromide (CTAB) by a precipitation reaction between aqueous solutions of calcium chloride (CaCl2) and sodium carbonate (Na2CO3) containing, or not, surfactant in their composition. Different shapes of crystals were obtained from rhombohedral ones to flowerlike, depending on surfactant type and concentration. From the two surfactants tested, SDS has a greater influence on calcium carbonate morphology than CTAB. The only polymorph obtained in all studied cases was calcite. The composite films BC-calcite were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and color measurements. The obtained BC-calcium carbonate composites could be used in paper manufacturing. 相似文献
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Biodegradable bacterial cellulose (BC) based films, incorporating sorbic acid (SA) as antimicrobial agent, have been obtained. Monolayer films, prepared using powdered BC (BCP) and poly(vinyl) alcohol (PVA), were coated with BC membrane to obtain multilayer films. Tests indicated that both SA and BCP concentration influenced sensitivity to water, release rate and antimicrobial ability of mono and multilayer films. Swelling degree, water vapour permeability and water solubility increased with SA content, but decreased with BCP addition. However in case of multilayer films, water solubility was negligible. Colour measurements indicated no degradation of SA during film preparation. The release of SA was faster when BCP concentration was higher but significantly slower, as a consequence of formed crystals dissolution, when antimicrobial concentration was increased. Furthermore, compared to the results for the monolayer films, an important decrease of SA release rate through the multilayer films was determined. The antimicrobial effect was tested against Escherichia coli K12-MG1655. The results obtained indicated that the new biocomposite films could be promising antimicrobial food packaging materials. 相似文献
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Iuliana Mihaela Jipa Loredana DobreMarta Stroescu Anicuta Stoica-GuzunSorin Jinga Tanase Dobre 《Materials Letters》2012,66(1):125-127
Antimicrobial composites from poly(vinyl alcohol) and bacterial cellulose containing potassium sorbate as antimicrobial agent were obtained by film casting method. The obtained films were tested against Escherichia coli and showed a good antimicrobial activity. 相似文献
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Vanillin release from poly(vinyl alcohol)-bacterial cellulose mono and multilayer films 总被引:1,自引:0,他引:1
Mono and multilayer materials from PVA and BC incorporating vanillin as natural antimicrobial ingredient were prepared. The composite films were characterized by means of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The release mechanism of vanillin from composites films was investigated using a pseudo first order model. The diffusion coefficients, calculated with Fick’s law of diffusion, are ranging from 1.69 × 10−12 to 3.84 × 10−12 m2 s−1. The vanillin release is influenced by films composition; the multilayer films being promising in order to achieve controlled release of vanillin. 相似文献
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