Grzegorz Zaguła

Grzegorz Zaguła
Rzeszów University · Department of Bioenergetics and Food Science

PhD in Agrophysics

About

85
Publications
41,277
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
378
Citations
Citations since 2016
72 Research Items
363 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Additional affiliations
February 2012 - October 2016
Rzeszów University
Position
  • Research Associate

Publications

Publications (85)
Article
Full-text available
Biochar from forest biomass and its remains has become an essential material for environmental engineering, and is used in the environment to restore or improve soil function and its fertility , where it changes the chemical, physical and biological processes. The article presents the research results on the opportunity to use the pyrolysis process...
Article
Full-text available
The purpose of this paper is to review the scientific results and summarise the emerging topic of the effects of statistic magnetic field on the structure, biochemical activity, and gene expression of plants. The literature on the subject reports a wide range of possibilities regarding the use of the magnetic field to modify the properties of plant...
Article
Full-text available
The stability of milk proteins is affected by changes in the pH value of milk, the heating temperature, and the addition of calcium compounds or chelating agents, which can cause alterations in calcium distribution. The purpose of this study was to determine the potential of the use of calcium citrate to manufacture fresh acid rennet cheese from hi...
Article
Full-text available
Biomass is one of the most important sources of renewable energy. One of the most widely used biomass biofuels is wood pellets. It is an economical, homogeneous and easy-to-use raw material. Biomass is used to generate low-emission energy utilizing the pyrolysis process. Pyrolysis allows for higher energy efficiency with the use of commonly availab...
Article
Full-text available
The leaves and unripe fruits from 5 walnut clones were tested in terms of mineral composition, antioxidant activity, and the inhibitory effect on model urease. It has been shown that the leaves are richer in minerals and also have higher antioxidant potential than unripe fruits. HPTLC polyphenolic profiles of leaves extract were found more abundant...
Article
Full-text available
Kombucha is a beverage made by fermenting sweetened tea with a symbiotic culture of yeast and bacteria. Literature data indicate that the kombucha beverage shows many health-promoting properties such as detoxification, chemo-preventive, antioxidant, antimicrobial, antifungal, and general strengthening. The research conducted focuses on the analysis...
Article
Full-text available
The presented article is a review of the literature reports on the influence of magnetic and electric fields on the growth, yield, ripening, and durability of fruits and their quality. The article shows the potential application of MF and EF in agricultural production. Magnetic and electrical fields increase the shelf life of the fruit and improve...
Article
Lead (Pb) is a highly toxic pollutant and represents a serious threat to wildlife, affecting various systems in animal bodies. Especially prone to Pb poisoning are waterbirds, which may inadvertently ingest spent gunshot, fishing sinkers and contaminated sediments. This research thus focused on evaluating Pb concentrations in the blood of 170 Mute...
Article
Full-text available
Nine samples of ethanolic extracts of poplar-type propolis (EEP) originated from South-Eastern Poland were analyzed in terms of the diversity of the flora around the apiary. The mineral composition, antioxidant properties, polyphenolic profile (HPTLC), and main polyphenolic constituents (HPLC-DAD) were determined. Only minor differences in chemical...
Article
Full-text available
Fir honeydew honey is a uniquely beneficial product which is often subjected to adulteration; however, pollen analysis is not useful to verify this honey type. Fourteen samples of EU protected designation of origin fir honeydew honey gathered directly from apiaries were studied. Standards of legal requirements and additional parameters, i.e., speci...
Article
Full-text available
Nowadays, researchers are looking into next-generation biostimulants that can be designed as a dedicated agronomic tool based on plant materials. The aim of the present study was to develop a novel biostimulating product, based on plant material in the form of linseed aqueous extracts. The scope of the research included the physicochemical characte...
Article
Full-text available
Magnetic stimulation of seeds before sowing can have a significant impact on the speed of their germination. Sprouts are sought after by consumers for their high nutrient content. The purpose of the study was to investigate the influence of a pulsed magnetic field on the dynamics of seed germination and on the content of ions in sunflower, cress, a...
Article
Full-text available
Drone brood is a little-known bee product which is frequently considered as a male equivalent of royal jelly and is sometimes used as its adulterant. The aim of the study was to compare the chemical composition and biological activity of both bee products originated from the same apiaries (n = 3) limiting the influence of genetic and environmental...
Article
Full-text available
Is it possible to characterize the types of honey based on their chemical composition, their content of bioactive substances, and their physicochemical properties? The objective of this study was a comparative analysis of four types of honey from the Carpathian Foothills area, located in south-east Poland, based on the content of the main phenolic...
Article
Full-text available
The interest expressed by the agriculture in the category of innovative biostimulants is due to the intensive search for natural preparations. Our study is the first ever to report a complex approach to the use of allelopathic extracts from Levisticum officinale Koch. roots in soybean cultivation, includes analyses of morphological observations, an...
Preprint
Full-text available
The interest expressed by the agriculture in the category of innovative biostimulants is due to the intensive search for natural preparations. Our study is the first ever to report a complex approach to the use of allelopathic extracts from Levisticum officinale Koch. roots in soybean cultivation, includes analyses of morphological observations, an...
Article
Full-text available
The aim of the work was to determine 5-hydoxymethylfurfural (HMF) content in fruit samples dried by slow convective method. Additionally, the nutritional value, mineral composition and antioxidant activity were investigated as parameters confirming the quality of the product. Seven different kinds of dried fruits certified as ecological products (a...
Article
A number of alternative solutions to be implemented in the sustainable agriculture have appeared in recent years that not only improve crop yield but also reduce environmental pollution. They include, i.a., the use of biostimulants which are believed to stimulate plants growth. The objective of study was to produce a novel and natural biostimulant...
Article
Full-text available
The biological activity of chocolates gains more and more attention of consumers. Its antioxidant properties depend, among other factors, mainly on the origin of cocoa and the characteristics that this origin gives to the final product. Therefore, the aim of the study was to measure and compare the total content of polyphenols, antioxidant activity...
Article
Full-text available
In this study, we tested the influence of two experimental factors on the composition of oat grain Avena sativa under the conditions of a three-year field study. The first factor (factor A) consisted of an Ascophyllum nodosum application, an organism classified in the Chromista kingdom, class Phaeophyceae, order Fucales; the second factor was the p...
Article
Medicinal herbs are used due to their health benefits, a special aroma, taste and are considered as one of the richest sources of bioactive compounds. The present study aimed to determine antioxidant activity (DPPH and phosphomolybdenum method), a total polyphenol (using Folin-Ciocalteu reagent), flavonoid (aluminium chloride method), phenolic acid...
Article
Full-text available
Amino acid chelates are a new group of compounds approved for food enrichment, however there is no previous research using calcium amino acid chelate to enrich goat’s milk products. The purpose of this research was to evaluate the possibility of using calcium amino acid chelate to produce goat’s acid-curd cheese. In this study, four types of acid-c...
Article
Full-text available
The transfer of toxic metals from soil to honey was studied based on two different areas of the Podkarpackie region located in the south-east part of Poland: U-urbanized and E-ecologically pure. The metal content was determined using the ICP-OES method with prior microwave mineralization of the soil, plant (goldenrod, dandelion, rapeseed, tilia and...
Article
Full-text available
This article presents the results of a two-year study investigating the effects of the fertilization of soil, with biochar and ash from plant biomass, on selected properties of the pyrolysis products obtained from basket willow (Salix viminalis L.) and giant miscanthus (Miscanthus x giganteus). The study was designed to determine whether soil enric...
Article
Full-text available
The article presents the findings of a study investigating the effects of storing Jonagold apples for six weeks in a condition in which the vertical component of the geomagnetic field has been eliminated (near null GMF) and in control conditions representing those applied in traditional storage (i.e., in the local geomagnetic field (local GMF)). An...
Article
Full-text available
Chicken eggshells can be used as an attractive dietary source of mineral compounds, including calcium (Ca). However, the effects of chicken eggshell powder (CESP) on berry fruit juices have not been studied to date. Therefore, the objective of this study was to evaluate the effect of its addition to juices from chokeberry and cranberry on their phy...
Article
The aim of the study was to obtain honey powders enriched with plant extracts by spray drying method and to implement them in the production of dry concentrate of isotonic drinks. Multifloral honey and maltodextrin dissolved in plant (mint, nettle and beetroot) aqueous infusions were transformed into honey powders using spray dryer. Obtained powder...
Article
Full-text available
Abstract There are no studies in the literature that comprehensively present the impact of factors related only to kosher slaughter on the content of minerals in beef. Therefore, learning the impact of such kosher determinants of beef as follows: no stunning during slaughter, cattle category, muscle, or the so‐called kosher treatment for mineral co...
Article
Full-text available
Food industry is on constant search for improved, enzymatically modified forms of proteins, which are the most important functional food ingredients, capable of either introducing or modifying texture, appearance, and flavour. One of the key aspects of food design is creating new functional properties and novel food macro- and microstructures in or...
Article
Concentrations of mercury (Hg) were examined in the blood of mute swans from rural breeding sites and urban wintering areas in southern parts of Poland, Europe. The birds were classified into three age groups: cygnets, juveniles and adults. To investigate the potential impact of Hg on birds, hematocrit (Ht), reduced glutathione (GSH) levels and mor...
Article
Full-text available
LCaŘ 135, č. 3, březen 2019 102 V klimatických podmienkach Poľska je cukrová repa jedinou surovinou na výrobu cukru. Pestuje sa viac ako 150 rokov a za tú dobu prešla dlhú cestu vývoja z hľadiska technológií výroby, šľachtenia rastlín, čo viedlo k úplnému zdokonaleniu a zlepšeniu rastliny (1). Rastúca populácia spôsobuje neustále zvyšovanie produkc...
Article
Full-text available
Honey and all bee products have very good biological and chemical properties. They have been used in medicine for a long time. In our study we evaluated twenty polyfloral honey samples, the first ten were commercial honeys from a selected supermarkets with country of origin indicated "blend of EU and non-EU honeys" and represented imported honey. T...
Article
Full-text available
Waste biomass from plant production is an important raw material for producing energy from renewable sources. Capabilities and technologies of processing are still being improved and modernized in order to achieve the highest energy efficiency. This study assesses energetic properties of wheat straw, rapeseed, and willow. The material was subjected...
Article
Full-text available
Tea is one of the most popular drinks in the world, commonly consumed by consumers from all age groups mainly due to its refreshing taste, attractive aroma, and potentially beneficial impact on health. The composition of a tea drink depends on numerous factors, such as time and brewing temperature, degree of crumbling of tea leaves, and degree of m...
Article
Full-text available
We assess the possibility of using biochar and ash from plant biomass to fertilise giant miscanthus (Miscanthus x giganteus). The paper concerns the optimisation of the combination of fertiliser applications of the aforementioned materials in the context of the plant yield obtained. There was an increase in yield of 8-68% over the two years of rese...
Article
Full-text available
Significant growth in the sales of fruit infusions and green teas has been observed in recent years. Different types of fruit infusions vary in terms of the mineral composition, while the content of minerals in infusions also depends on the duration and temperature of brewing. Being uncertain about the composition of fruit teas available on the mar...
Article
Full-text available
Background: The pomegranate (Punica granatum L.) has gained a reputation as a fruit with many health- promoting properties. It is considered to help prevent or treat various disease risk factors including high blood pressure, high cholesterol, oxidative stress, hyperglycemia and inflammatory activities. It has been demonstrated that certain compon...
Article
Full-text available
In view of the growing tea consumption and the variety of tea brands available on the market, the aim of the study was to determine the content of selected minerals (K, Ca, P, Mg and Al) in black, white and green teas as well as to estimate the influence of brewing time and the addition of acid (lemon juice) during the process of tea brewing on the...
Article
Full-text available
The aim of the study was to investigate the transfer of toxic metals from honeybee workers (Apis mellifera L.) to bee honey in relation to the ecological state of the environment. The materials of the study consisted of samples of honeybee bodies and varietal honeys taken from the same apiary located in three areas: R1-urbanized (16), R2-ecological...
Article
Full-text available
This article presents the findings of a study investigating the feasibility of using a magnetic field assisted technique for the water-based extraction of mineral components, polyphenols, and caffeine from dry black and green tea leaves. The authors present a concept of applying constant and variable magnetic fields in the process of producing wate...
Article
Full-text available
Because of their physicochemical properties, biochars can be used as sorption materials for removal of toxic substances. The purpose of the present study was to determine whether biochar obtained from cones of larch (Larix decidua Mill. subsp. decidua) and spruce (Picea abies L. H. Karst) could be used as a sorbent for Cd2+, Pb2+ and Co2+ in aqueou...
Article
Full-text available
The aim of the study was to compare the heavy metal contamination and study the mineral content of Polish and Romanian honeys. We used Polish varietal honeys (n=18) produced in the year 2013-2014 in ecologically clean Podkarpackie region, and Romanian honeys (n=36) from Bihor district produced in 2013. The heavy metals concentration as well as mine...
Article
Full-text available
This paper presents an influence of three different magnetic fields stimulation systems for growing strawberry fruits: permanent magnetic field generated by neodymium magnets, ”high” strengths slow varying amplitudes magnetic fields generated by coreless solenoids supplied by autotransformer and low-frequency and low-amplitude sinusoidal magnetic f...
Article
Full-text available
The study investigated the effects of using mineral fertilisers and pre-sowing stimulation of seeds on the yield of roots and the content of selected mineral elements in the roots of three sugar beet cultivars. The treatment consisted of applying a slowly changing magnetic field of 50 mT induction for a period of 60 seconds, so as to avoid heating...
Article
Full-text available
The study investigated the effects of using mineral fertilisers and pre-sowing stimulation of seeds on the yield of roots and the content of selected mineral elements in the roots of three sugar beet cultivars. The treatment applied a slowly changing magnetic field of 50mT induction for a period of 60 seconds. in order to avoid heating the research...
Article
Full-text available
Birch sap is used as a traditional drink and in traditional medicine in many countries in the northern hemisphere. However, there are scarce data on the antioxidant properties, nutrients and the mineral content of birch saps. In this study, the above-mentioned properties were analyzed in two different birch species Betula pendula Roth (silver birch...
Article
Full-text available
The main sources of calcium intake in a diet are milk and dairy products, and dietary calcium absorption ranges from 10% to 40%. Approximately 32% of calcium is absorbed from milk and dairy products. An insufficient intake of calcium by the Polish population has stimulated the marketing of an increasing number of food products fortified with calciu...
Article
Full-text available
Background: The processing of tea leaves determines the contents of bioactive ingredients, hence it should be expected that each variety of tea, black, red or green, will represent a different package of compounds of physiological importance. Taste and aroma, as well as price and brand are the main factors impacting consumers’ preferences with reg...
Article
Full-text available
Birch sap is used as a traditional drink and in traditional medicine in many countries in the northern hemisphere. However, there are scarce data on the antioxidant properties, nutrients and the mineral content of birch saps. In this study, the above-mentioned properties were analyzed in two different birch species Betula pendula Roth (silver birch...
Article
Full-text available
The presented system describes a concept for generating slowly varying signals to stimulate biological objects with magnetic field. The system enables independent control of up to 10 induction coil and it generates changeable signal inducing magnetic fields in the range from 0.1 to 150µT and the frequencies from 0.1 to 100 Hz. The proposed system w...
Article
Full-text available
The presented system describes a concept for generating slowly varying signals to stimulate biological objects with magnetic field. The system enables independent control of up to 10 induction coil and it generates changeable signal inducing magnetic fields in the range from 0.1 to 150μT and the frequencies from 0.1 to 100 Hz. The proposed system w...
Article
Full-text available
Accurate identification of fruit harvest timing is quite a complicated issue. We know several methods of determining harvest maturity in climacteric fruits; these include measurement of: firmness, total solids contents, respiration rate, ethylene emission measurement as well starch tests. On the other hand non-climacteric fruits (no collective matu...
Article
Full-text available
Accurate identification of fruit harvest timing is quite a complicated issue. We know several methods of determining harvest maturity in climacteric fruits; these include measurement of: firmness, total solids contents, respiration rate, ethylene emission measurement as well starch tests. On the other hand non-climacteric fruits (no collective matu...
Conference Paper
Pyrolysis is a decomposition process occurring in matter exposed to high temperature in the absence of oxygen. One of its products is biochar (carbonization product) – a material similar in properties and composition to charcoal. In addition to relatively stable carbon, biochar contains macro- and micro-elements, as a result of which the wide range...
Conference Paper
The geomagnetic field is a natural component of the environment for the living organisms on Earth. In the earliest studies the role of the geomagnetic field was examined in relation to directional orientation of birds and other migratory animals. A number of hypotheses have been suggested to account for this phenomenon. In particular, research has...
Conference Paper
Waste biomass from plant production is an important raw material for the production of energy from renewable sources in Poland. Capabilities and technologies of processing are still being improved and modernized in order to achieve the most favorable energy efficiency. The study assesses the energy properties of wheat straw, rape and willow grown....