Papers by Anet Režek Jambrak
Sustainability
The Sustainable Development Goals (SDG) encourage the efficient use of sustainable technologies. ... more The Sustainable Development Goals (SDG) encourage the efficient use of sustainable technologies. Ultrasound-assisted extraction (UAE) is one of the extraction process techniques, which are also directed towards sustainability as a goal. Coffee silver skin (CS), being a healthy raw material as well as a waste, could be utilized in the manufacturing process of new dietary products. The goal of this research was to isolate proteins and polyphenols from CS using UAE and to employ spectrophotometry to determine the yields. Three parts of the research were conducted: ultrasonic extraction, the optimization of UAE conditions for the isolation of proteins and polyphenols from CS, and the analysis of the amino acid extract obtained with the optimal use of UAE. According to the results, it was reported that the highest yields of total polyphenols isolated from the CS using UAE were obtained by applying an amplitude of 75% and a time interval of 9 min. The optimal parameters of UAE, when consi...
Agronomy
Artificial intelligence (AI) involves the development of algorithms and computational models that... more Artificial intelligence (AI) involves the development of algorithms and computational models that enable machines to process and analyze large amounts of data, identify patterns and relationships, and make predictions or decisions based on that analysis. AI has become increasingly pervasive across a wide range of industries and sectors, with healthcare, finance, transportation, manufacturing, retail, education, and agriculture are a few examples to mention. As AI technology continues to advance, it is expected to have an even greater impact on industries in the future. For instance, AI is being increasingly used in the agri-food sector to improve productivity, efficiency, and sustainability. It has the potential to revolutionize the agri-food sector in several ways, including but not limited to precision agriculture, crop monitoring, predictive analytics, supply chain optimization, food processing, quality control, personalized nutrition, and food safety. This review emphasizes how ...
Foods
The increased demand for functional food with added health benefits is directing industrial proce... more The increased demand for functional food with added health benefits is directing industrial procedures toward more sustainable production of naturally added bioactive compounds. The objective of this research was to investigate the potential of bioactive compounds from rosemary extract obtained using high-voltage electrical discharge as a green extraction method, for microencapsulation as a protective method for future application in functional food. Four types of microparticles were made via the ionic gelation method using alginate (Alg), zein (Z), and hydroxypropyl methylcellulose (HPMC) biopolymers and were analyzed considering the physicochemical properties. The diameter of dry microparticles ranged from 651.29 to 1087.37 μm. The shape and morphology analysis of microparticles showed that the obtained microparticles were quite spherical with a granular surface. The high encapsulation efficiency was obtained with a loading capacity of polyphenols up to 11.31 ± 1.47 mg GAE/g (Alg/...
Foods
The aim of this research was to evaluate the health safety (concentrations of pesticide residues ... more The aim of this research was to evaluate the health safety (concentrations of pesticide residues and heavy metals) and nutritional parameters (macro- and microminerals and crude fibre) of coffee silver skin (CS), as well to isolate proteins from this by-product using an optimised microwave extraction method. The CS by-product samples showed the highest amount of potassium, followed by calcium, magnesium, and sodium. Iron was found in the highest quantity among the microminerals, followed by copper, manganese, zinc, and chromium. The CS sample showed a large amount of fibre and a moderate quantity of proteins obtained by the optimised microwave extraction method. Four heavy metals (nickel, lead, arsenic, and cadmium) were detected, and all were under the permitted levels. Among the 265 analysed pesticides, only three showed small quantity. The results for the proteins extracted by microwave showed that the total protein concentration values ranged from 0.52 ± 0.01 mg/L to 0.77 ± 0.07...
Applied Sciences
Ultrasound with water as a green solvent is an effective strategy for reducing losses and increas... more Ultrasound with water as a green solvent is an effective strategy for reducing losses and increasing the utilization of by-products. The extraction of proteins and specialized plant metabolites from sugar beet leaves (Beta vulgaris subsp. vulgaris var. altissima) promotes sustainability in the agro-food chain. Guided by sustainability, samples treated with ultrasound showed lower energy consumption and lower CO2 emissions. Furthermore, the spectrophotometric determination revealed higher protein and phenol yields in ultrasonically treated samples compared to thermally treated ones. The highest yield of total proteins, 147.91 ± 4.58 mg (gd.m.)−1, was observed during ultrasound treatment (amplitude 100%, treatment time 9 min). Under the same extraction conditions, the same trend was observed in the yield of total phenols 17.89 ± 0.38 mg (gd.m.)−1. High-power ultrasound, compared to the thermal extraction method, has increased the yield of proteins and specialized plant metabolites wit...
Applied Sciences, 2021
This work reviews the recent development of biopolymer-based delivery systems for agricultural ap... more This work reviews the recent development of biopolymer-based delivery systems for agricultural application. Encapsulation into biopolymer microparticles ensures the protection and targeted delivery of active agents while offering controlled release with higher efficiency and environmental safety for ecological and sustainable plant production. Encapsulation of biological agents provides protection and increases its survivability while providing an environment safe for growth. The application of microparticles loaded with chemical and biological agents presents an innovative way to stimulate plant metabolites synthesis. This enhances plants’ defense against pests and pathogens and results in the production of higher quality food (i.e., higher plant metabolites share). Ionic gelation was presented as a sustainable method in developing biopolymeric microparticles based on the next-generation biopolymers alginate and chitosan. Furthermore, this review highlights the advantages and disad...
Ultrasonic waves can be readily propagated through certain optically opaque materials including m... more Ultrasonic waves can be readily propagated through certain optically opaque materials including many foods and packaging materials. For food products expected to exhibit extended shelf-life, a loss of packaging integrity may be a precursor to major food safety and quality issues. Coated (acrylic/ polyvinylidene chloride) biaxially oriented transparent polypropylene (BOPP/Ac/PVDC) films was treated for 2, 4 and 6 minutes with power ultrasound, high intensity and low frequency, 20 kHz probe with constant amplitude of 50%, 75% and 100% (S-4000, Misonix Sonicators, Newtown, Connecticut, SAD). The oxygen permeability, using a Brugger (GDP-C model) permeability tester, of the BOPP/Ac/PVDC was analysed at 20/40/60 °C. The permeability (P), the diffusion (D) and the solubility (S) constants of the oxygen in BOPP/Ac/PVDC film was determined before and after ultrasound treatments. Ultrasound treatment (6 min., 50% amplitude) increased oxygen permeability of BOPP/Ac/PVDC film from 3.8 cm3/m2.d...
World Academy of Science, Engineering and Technology, International Journal of Nutrition and Food Engineering, 2017
Green Food Processing Techniques, 2019
Abstract One of the developmental aspects of food science is testing and adapting advanced techno... more Abstract One of the developmental aspects of food science is testing and adapting advanced technologies for food production, which save resources and improve food quality. More often than not, this includes technologies operating at lower temperatures, shorter time, and resulting in better preservation of the thermolabile compounds in the foods, as compared to conventional technologies. Nutritionally rich but thermally sensitive raw materials such as fruit, vegetables, meats, and others can particularly benefit from the application of such advanced food technologies. Technologies with the most tested potential for industrial implementation include nonthermal plasma, pulsed electric field, high hydrostatic pressure, high-intensity ultrasound, etc. Even though such technologies have obstacles to wide industrial implementation, they can be applied in unit operations such as processing, pasteurization, and extraction. In addition, those technologies combined with exploitation of the economic and sustainable raw materials, such as industrial wastes from food production, are foundation for green and eco-friendly food production and processing. This chapter gives an overview of green food processing concepts, strategies, and tools.
Handbook of Electroporation, 2016
Pulsed electric field (PEF) processing has emerged as a promising technology in the development o... more Pulsed electric field (PEF) processing has emerged as a promising technology in the development of tailor-made processes to effectively control the enzyme activity. It has been proven as an effective technique for the preservation of food products as it can result in substantial inactivation of most undesirable enzymes. When compared to microbial inactivation, however, large specific energy inputs are required to inactivate enzymes. The existing evidence suggests that PEF can also stimulate the activity of beneficial enzymes at low intense treatments. The PEF affects enzyme activity by changing mainly the secondary (α-helix, β-sheets, etc.), tertiary (spatial conformation), and quaternary (number and arrangement of protein subunits) structures of the enzyme. There is not yet strong evidence that PEF induce chemical changes in primary structure. Both electrochemical effects and ohmic heating associated with PEF impact contribute to the change in enzyme structure and function. In addition, a number of factors including the physicochemical properties the enzyme, PEF treatment parameters, the processing condition, and the composition of the medium can significantly contribute to the enzyme activity. However, the exact mechanism of PEF action on enzymes at atomic level is not fully understood. In the past 20 years, several studies have confirmed that PEF at high intensity or in combination with mild heat causes substantial inactivation of several food quality-related enzymes such as alkaline phosphatase, peroxidase, proteases, lipase, pectin methylesterase, polyphenol oxidase, etc. Meantime, some reports show that PEF treatment has no effect on inactivation of certain enzymes at a given treatment condition. However, results obtained in different studies cannot be compared as the equipment used, treatment parameters, and medium are inconsistent in these studies. For effective treatment, PEF processing parameters must be optimized depending on the enzyme and target product.
Sustainability, 2021
This paper gives an overview of main food supply chain stakeholders and their role in achieving t... more This paper gives an overview of main food supply chain stakeholders and their role in achieving the UN Sustainable Development Goals (SDGs). As this supply chain is global, playing a significant role in feeding the world, a deeper analysis of 17 SDGs, their targets and indicators reveals numerous direct and indirect connections with various SDGs. To perform such an overview, the authors investigated the link between the main stakeholders of the chain (farmers, food processors, food traders and consumers) with UN SDGs. In parallel, the authors explored the roles of policymakers, inspection services, certification bodies and academia in supporting these SDGs. In spite of numerous papers, calculations and estimations, discussion and media coverage, the authors believe that only the tip of the iceberg has been revealed. Based on this overview, the authors emphasize SDG 2—Zero Hunger and SDG 12—Responsible Consumption and Production as the most dominant for the food supply chain. In para...
Journal of Food Processing and Preservation, 2020
Nonthermal processing technologies have been researched in lab scale for more than 15 years. In t... more Nonthermal processing technologies have been researched in lab scale for more than 15 years. In this study, the influence of sonification and high voltage electrical discharge-plasma treatment of water on the formation and stabilization of hydroxyl radicals has been investigated by electron paramagnetic resonance (EPR) spectroscopy and spin-trapping method. As analysis tool, an agglomerative hierarchical clustering was used in grouping samples recorded by EPR and near infrared spectroscopy (NIR) spectroscopy. Also, the multivariate analysis was performed using the principal component Accepted Article This article is protected by copyright. All rights reserved analysis (PCA) and Principal Regression models (PCR). Results for ultrasound treated samples showed that number of radicals is increasing with treatment time and increase in amplitude. Highvoltage electrical discharge treatment at 120 Hz resulted in the formation of the largest number of hydroxyl radicals. Developed PCR models are highly effective in prediction of NIR spectra, regardless the sample treatment what is an additional step forward in green technology. Practical application: Usage of electron paramagnetic resonance measurement can be used in laboratory and scale-up treatments by nonthermal processing. It is of outmost importance to monitor the production of free radicals, from starting of processing, in order to avoid overtreatment of foods and to avoid possible oxidation and unwanted radical chain reactions. Monitoring of processing can be used to optimize nonthermal processing and to avoid production of unwanted oxidative products and compounds.
Quality Assurance and Safety of Crops & Foods, 2020
Many studies introduced cold plasma as a novel and effective processing technology for microbial ... more Many studies introduced cold plasma as a novel and effective processing technology for microbial decontamination of food and water as well as for the removal of environmental pollution such as pesticide. However, as there are several types of plasma designs, their efficacy in degrading major pesticide residues, such as chlorpyrifos (as a hazardous chemical), should be explored. This study was conducted to assess the decontamination efficacy of 8 min of arc and dielectric barrier discharge (DBD) plasma on chlorpyrifos pesticide-water samples at a con-centration of 2 mg·L-1. The plasma-treated samples were assessed by liquid chromatography-mass spectrometry (LC-MS) and compared with the control (untreated) sample. In addition, the effects of plasma processes on some physical properties of samples were studied. According to the results, plasma-treated samples showed similar physical characteristics (e.g., refractive index and color values) to those of the untreated samples. While the t...
International Journal of Food Science & Technology, 2020
Journal of Food Process Engineering, 2020
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Papers by Anet Režek Jambrak