https://repository.utm.md/handle/5014/21620 2026-04-20T04:17:27Z 2026-04-20T04:17:27Z SPINEI, Mariana OROIAN, Mircea URSACHI, Vasile-Florin https://repository.utm.md/handle/5014/31136 2025-04-30T11:22:42Z 2024-01-01T00:00:00Z

Formulation and stability of biodegradable films made from cellulose, pectin, and bee bread oil SPINEI, Mariana; OROIAN, Mircea; URSACHI, Vasile-Florin Polymers that are biodegradable, environmentally safe, and edible are produced from sustainable and edible ingredients like lipids, polysaccharides, and proteins, and degrade faster than non-renewable petroleum-based polymeric compounds [1]. Cellulose, starch, and chitosan are natural sources of polysaccharide that can be used as an edible film in agricultural products to extend the shelf life of fresh fruits and vegetables, reduce oil/fat absorption in fried food, and prevent food flavor loss [1,2]. The aim of this study was to produce films from carboxymethyl cellulose (CMC), pectin, bee bread oil (BBO), and glycerol in order to determine some mechanical and physicochemical parameters (e.g., oxygen permeability, color, thickness) of obtained films. The thickness of the film is a major characteristic that determines other properties (such as optical, barrier, mechanical, and thermal properties) of the films that have been developed. The highest value of thickness (63.2 μm) was obtained for control sample (CMC), while the lowest value (54.4 μm) was recorded for sample formulated with 1% bee bread oil (CMC + 10% P + 1% BBO). It can be explained by the fact that CMC is able to form ionic bonds with ionic polysaccharides like pectin because of its anionic structure [1]. The OP of prepared films decreased with the addition of 1% BBO (0.78 cc × mm/m2 × atm × day) but increased after addition with higher concentrations of BBO (0.84 cc × mm/m2 × atm × day). OP values in the case of 2 and 3% BBO films can be explained by the fact that essential oil influenced the polymeric matrix, dynamics, and statics of polysaccharides used in film formulation. L* values decreased when BBO was incorporated into the CMC films, while the h*ab values ranged between 5.8 and 345.4; all developed films were ascribed to the red color. Additionally, principal functional groups and interaction between CMC, P, and BBO were observed by FT-IR spectroscopy. Conclusions. BBO can easily be incorporated into polymer aqueous solutions to obtain cast films. The CMC + 10% P + 2% BBO film showed best results in all the characterizations. The results showed that values for OP were lower for films incorporated with BBO in comparison with control sample. Therefore, these films are suitable for application in food industry in which a high oxygen barrier is needed.

2024-01-01T00:00:00Z VOLODIN, Sergii MYRONCHUK, Valerij ZAPOROZHETS, Oleksandr https://repository.utm.md/handle/5014/31135 2025-04-30T11:16:41Z 2024-01-01T00:00:00Z

Engineering approach to optimization of pneumatic transportation processes in the food industry VOLODIN, Sergii; MYRONCHUK, Valerij; ZAPOROZHETS, Oleksandr The study is aimed at developing and improving mechatronic systems for pneumatic transportation of bulk food products. The relevance of this topic is due to the ever-increasing requirements for the efficiency and accuracy of such systems in modern production processes. Existing models of pneumatic conveying often do not take into account the complex physical processes that occur during the movement of particles in a compressed air stream, such as particle migration, hydrodynamic and electrical interactions. This leads to inaccuracies in calculations and, as a result, to a decrease in the efficiency and reliability of systems. To solve this problem, we developed an experimental mechatronic module that allows us to study the process of pneumatic transportation in detail. Based on the experimental data and theoretical calculations, a mathematical model was built that describes the movement of bulk material particles in a compressed air flow, taking into account the geometric characteristics of the system, physical properties of the material, and flow parameters. The study determined the optimal parameters of pneumatic transportation, such as air flow rate, pressure, pipeline diameter, etc. It was found that the number of transported particles reaches a maximum within a short period of time after the compressed air is supplied. The dependence of compressed air consumption on system pressure was also determined. The results of the study made it possible to develop a new approach to modeling pneumatic transport, which takes into account a wide range of factors affecting this process. The proposed model can be used to develop more efficient and reliable pneumatic transportation systems in various industries. A comprehensive analysis of the process of pneumatic transportation of fine products was carried out to develop effective control systems. A mathematical model has been created that describes in detail the dynamics of the movement of individual particles in a compressed air flow, taking into account their interaction with the walls of the pipeline and with each other. The model takes into account the geometric characteristics of the system and the physical properties of the transported material. To verify the model, an experimental bench was developed to investigate the effect of various process parameters on the flow characteristics. In particular, the effect of compressed air pressure, flow rate, and pipeline geometry on the particle distribution in the flow was analyzed. The experimental data obtained are in good agreement with the results of mathematical modeling.

2024-01-01T00:00:00Z DANILESCU, Olga CILOCI, Alexandra COCU, Maria https://repository.utm.md/handle/5014/31134 2025-04-30T11:11:19Z 2024-01-01T00:00:00Z

Coordination compound of FE(III) as stimulator of exocellular lipase synthesis for the Rhizopus arrhizus CNMN FD 03 fungal strain DANILESCU, Olga; CILOCI, Alexandra; COCU, Maria In the present work, the biological effect of 2,6-diacetylpyridine-bis(picolinoylhydrazone)-bis(aqua)iron(III)-hydrate(1/2.5), with the formula [Fe(H2L)(H2O)2](NO3)3∙2.5H2O (where H2L represents 2,6-diacetylpyridine bis(picolinoylhydrazone)), has been described. This coordination compound is highly soluble in water, which ensures a practical use as a component of nutrient mediums. The nutrient medium for submerged cultivation of the fungal strain Rhizopus arrhizus CNMN FD 03 contains soybean meal, (NH4)2SO4, KH2PO4, water and stimulant ([Fe(H2L)(H2O)2](NO3)3∙2.5H2O) in the following quantitative ratio of the components (g): soy flour – 35.0, (NH4)2SO4 – 1.0, KH2PO4 – 5.0, [Fe(H2L)(H2O)2](NO3)3∙2.5H2O – 0.005…0.015, drinking water – up to 1 L. The addition of coordination compound [Fe(H2L)(H2O)2](NO3)3∙2.5H2O to the nutrient medium of Rhizopus arrhizus CNMN FD 03 fungal strain, in concentration of 5.0…15.0 mg/L increases biosynthesis of lipases with 17.4…82.7%, depending on the concentration and reduces the producer`s cycle of cultivation by 24 h. Thus, the highest values of lipase activity were found in the first day of growth, while in the control (without stimulator) the maxim of activity was revealed in the second day. The most effective concentration for enzyme production was 5.0 mg/L [1]. In conclusion, the coordination compound [Fe(H2L)(H2O)2](NO3)3∙2.5H2O can be used as biostimulator of exocellular lipase synthesis for the mycelial fungal strain Rhizopus arrhizus CNMN FD 03 for the development of biotechnologies to obtain lipolytic enzymes.

2024-01-01T00:00:00Z VERKHIVKER, Yakov MYROSHNICHENKO, Olena https://repository.utm.md/handle/5014/31133 2025-04-30T11:04:45Z 2024-01-01T00:00:00Z

Complex of measures to prevent food product and container VERKHIVKER, Yakov; MYROSHNICHENKO, Olena Prevention of counterfeiting includes a set of preventive measures consisting of the following areas: Market monitoring and analysis. Organization of a market scanning system, monitoring the state of the container and food market, determining and assessing the real level of counterfeiting, studying trends. Creation of a counterfeiting database that is formed on the basis of monitoring. This is a structured data system, scientific articles, analytical and statistical calculations, regulatory documents. Risk assessment and management. Scientifically based risk assessment allows for measures to prevent counterfeiting, minimize associated moral and material losses, and build appropriate barriers to counterfeiting (for example, developing appropriate laws). Forecasting counterfeiting. Creating a strategy, determining indicative parameters and mechanisms to counteract counterfeiting. Conclusions and assessments obtained on the basis of a comprehensive market analysis and the use of modern methods. Identification of typical counterfeiting schemes and establishment of barriers to counterfeiting. This is the differentiation of the entire path of production, from its theoretical development to its transfer to the consumer, into separate sections, including the preparation of regulatory documents, the purchase of raw materials, production, storage, transportation, sales, etc. In potentially dangerous areas, additional reporting forms should be established, elements of external control should be introduced and expanded, etc. Evidence base. The legal and evidentiary base is built on the methodology of identifying counterfeiting and includes methods for establishing signs of counterfeiting, determining how, at what stage, when, where, by whom the counterfeiting was carried out and who is responsible for it. Methods. It is necessary to develop special methods to identify counterfeiting, which must meet the conditions of efficiency, availability, accuracy and reproducibility, safety and cost-effectiveness. Since counterfeiting is transformed, accordingly, detection methods must be constantly adapted and improved. Based on scientific methods, techniques and methods are developed, laboratories are created. Laboratories. A conclusion on determining falsification will be recognized as legitimate only if the laboratory that issued it is accredited. Expert. In addition to generally known, publicly available knowledge, an expert must have narrow professional skills, competence in the field of food technology, nutrition, nutraceuticals, chemistry and biochemistry of food. Thus. the algorithm for counteracting falsification includes identifying a specific object, identifying the type and method of falsification finding out who produced the falsified product, when and who is responsible for it.

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