Amra Odobasic | University of Tuzla (original) (raw)

Papers by Amra Odobasic

Medicinal plants have become an increasing subject of interest worldwide due to the large amount ... more Medicinal plants have become an increasing subject of interest worldwide due to the large amount of biologically active substances that have potential beneficial health properties. One of the more interesting popular medicinal plants is hawthorn (Crataegus spp.), a deciduous branched shrub that is increasingly used for health purposes. Various parts of this plant, including berries, flowers and leaves, are rich in nutrients and beneficial bioactive compounds that are effective in the treatment of numerous diseases. Honey is a natural sweetener produced by bees from plant secretions. Known for its nutritional and medicinal values, it gives strength to the body, which is why it is indispensable in the human diet. The combination of these two ingredients represents a significant source of vitamins and minerals in daily use, but also for use in various pharmaceutical and medical purpose. Taking into account all of the above, the aim of the work is to test samples of the mixture of honey and hawthorn in different proportions and determine the physical and chemical characteristics: pH value, electrical conductivity, refractive index, viscosity, water activity, HMF, DPPH. Based on the analysis, appropriate conclusions will be drawn and more information will be obtained about their quality and possible use as a food supplement. On the basis of the conducted analyses, it can be concluded that the parameter values are within the permitted limits defined by the Rulebook (Official Gazette Bosnia and Herzegovina No. 37/09). The analysis of the mentioned parameters showed that the chemical composition of the sample plays a major role in the value of the measurement results, and that Sample III has the best antioxidant properties.

Prirucnik daje pregled znacaja voca i povrca u prehrani, promjena na vocu i povrcu nakon branja, ... more Prirucnik daje pregled znacaja voca i povrca u prehrani, promjena na vocu i povrcu nakon branja, te tehnologije cuvanja svježeg voca i povrca i vrsta i tipova hladnjaca.

Greenhouse production is getting more and more important in the production of food, particularly ... more Greenhouse production is getting more and more important in the production of food, particularly if it is considered as ecological production. Having it in mind, it is very important to provide continual control of quality such products. This work is aimed to present the monitoring of the content of heavy metals in tomato, grown in greenhouse conditions. In products grown in greenhouses, heavy metals can be present from different sources such as soil, pesticides, etc. This paper considers the importance of continual monitoring of presence of heavy metals, such as cadmium, lead, copper, iron, etc. in tomato, taking in consideration their bioavailability to plants in acid and basic soil conditions. Obtained results in this work could be used as the base for establishing the model for continual monitoring of contaminants in food, particularly those that are present in very small concentrations, such as lead, cadmium, etc.

International journal for research in applied sciences and biotechnology, Apr 8, 2022

In this research, the results of bentonite characterization (pH value of bentonite suspension, po... more In this research, the results of bentonite characterization (pH value of bentonite suspension, point of zero charge, cation exchange capacity, SEM, XRF, DTG) are presented. The results of lead (II) removal efficiency at initial lead (II) concentrations of 200, 300 and 400 mg/L, and biosorbent dosage of 1 gram in 50 ml of lead (II) solution, are also presented, as well as the values of the Freundlich and Langmuir constants from the Freundlich and Langmuir adsorption isotherms. The obtained results showed that removal efficiency is high for all three examined initial lead (II) concentrations, and it is above 99%. The lead (II) removal efficiency slightly decreases with an increase in initial lead concentration. Experimental data obtained from adsorption experiment with contact time of 2.5 minutes, stirring rate 100 rpm, temperature 25 0 C and pH value 5 are better fitted with the linearized Langmuir equation isotherm, giving an R 2 value closest to unity (0.9994), than to linearized Freundlich equation (0.9886).

International journal of materials and chemistry, 2018

In this paper, two different groups of liquid soaps were prepared. The first group of samples con... more In this paper, two different groups of liquid soaps were prepared. The first group of samples consisted of anionic surfactant (SLES), amphoteric surfactant (BETAIN) and nonionic surfactant (DEA). The second set of samples consisted of anionic surfactant and two nonionic surfactants. The aim of this work is to investigate the influence of the type of surfactant as well as the mass fraction of surfactants on the physicochemical properties of liquid soap. The surface tension, electrical conductivity and density for different concentrations of all examined type of surfactants have been determined as well as the critical micelle concentration (CMC). Moreover, the studies have shown that by increasing concentrations of zwitterionic (amphoteric) surfactant, and by decreasing concentration of nonionic surfactant, a mild decrease in pH value and viscosity increase occurred. In contrast, with increasing polyglycoside concentrations and decreasing concentration of DEA, a mild increase in pH but a decrease in viscosity was observed. In order to monitor the stability of the liquid soaps obtained, the appearance, color and odor were observed at three different temperatures at +4°C, room temperature and at + 40°C, in the dark and under UV light during the three months.

VOL. 2, NO. 3 (2022)

Water hardness and deposition of incrustation is a problem in households and industry. In this re... more Water hardness and deposition of incrustation is a problem in households and industry. In this regard, several technologies have been developed with the purpose of water softening and preventing the deposition of incrustation. The ion exchange method is the most commonly used method and is considered a conventional method. However, due to the shortcomings of this method, there is a need to develop adequate alternative methods. The potential of the method using biosorbents such as moss Leucobryum glaucum and Spaghnum peat moss for the purpose of removing water hardness has recently become the subject of intensive research with growing interest. In this study, the method using Leucobryum glaucum as a biosorbent was tested and a comparison was made with the conventional method and previously conducted studies that used other biosorbents.

Annual Research & Review in Biology

In this article, the corrosion inhibition of steel DIN 2391 St 37-4 in acidic medium 5% H2SO4 wit... more In this article, the corrosion inhibition of steel DIN 2391 St 37-4 in acidic medium 5% H2SO4 with and without the presence of eco inhibitors of leaf (Petroselinum Sativum) was examined. Inhibitory properties of parsley leaves (Petroselinum Sativum) on steel DIN 2391 St 37-4 were examined by potentiodynamic polarization - Tafel extrapolation, and FTIR method in order to categorize the oxide layer. The test was performed in static medium and with stirring at 600 rpm. By Tafel extrapolation based on changes in corrosion potential, the inhibitor behaves as mixed. Increasing the concentration of inhibitors increases the efficiency of inhibition. Corrosion processes are inhibited by adsorption of organic matter on the surface of steel DIN 2391 St 37-4, forming a film. The obtained results indicate that parsley leaf (Petroselinum Sativum) is an effective eco inhibitor for the tested steel in 5% sulfuric acid.

International Research Journal of Pure and Applied Chemistry, 2021

In this research, the possibility of using Ca(OH)2 in the form of commercial hydrated lime as a c... more In this research, the possibility of using Ca(OH)2 in the form of commercial hydrated lime as a catalyst for the methanolysis of refined rapeseed oil was evaluated. Characterization of unused catalyst was performed by SEM-EDS, laser diffraction, XRF, BET, XRD and TG/DTG methods, and vegetable oil was analyzed for physicochemical characteristics. Within methanolysis, the effects of catalyst loading, reaction temperature and reaction time on methyl ester yield, density and viscosity of biodiesel, as well as the possibility of catalyst reuse were investigated. The obtained results showed that hydrated lime is an efficient catalyst for transesterification of vegetable oil, whereby the use of 3 wt% of catalyst relative to oil weight, at temperature 60℃ and mixing rate 1000 rpm after 120 min of transesterification reaction achieved a yield of methyl esters 98.76%. With three reuses of hydrated lime, without intermediate washing and regeneration procedures, the yield of rapeseed oil methyl...

Journal of Radioanalytical and Nuclear Chemistry, 2022

Red beet peel was utilized for U(VI) removal in a batch system. The characterization of prepared ... more Red beet peel was utilized for U(VI) removal in a batch system. The characterization of prepared biosorbent was performed by Fourier transform infrared spectroscopy, energy dispersive X-ray fluorescence spectroscopy, scanning electron microscopy, energy dispersive spectroscopy analysis and pH point of zero charge was also determined. Removal of uranium was favourable at pH 7.00 with biosorption capacity of 41.21 mg/g, and results showed that used biosorbent exhibits selectivity for U(VI) ions. Obtained data showed very good agreement with Langmuir’s and Freundlich’s models. Experimental results fitted very well to pseudo-second order model and thermodynamics showed spontaneous nature of biosorption process.

Soil is system, where heavy metals, such as lead, cadmium, copper, etc., can be present in higher... more Soil is system, where heavy metals, such as lead, cadmium, copper, etc., can be present in higher concentration then it is usual. Heavy metals are usually present in soil, bounded to clay, but if some conditions, such as pH, acidity, have been changed, then they are released to the soil solution. This work is going to present factors, such as pH, acidity, organic matter content, etc., which have impact on releasing of heavy metals to the soil, and forward to plants. The content of heavy metals in soil solution, such as lead, copper, etc. depend on above mentioned factors, and for different soil conditions, such as organic matter and pH, as the most important factor for binding and releasing of heavy metals from and to soil will be presented.

International Journal for Research in Applied Sciences and Biotechnology, 2018

The problem of environmental pollution is more expressed and more present by the development of t... more The problem of environmental pollution is more expressed and more present by the development of the industry and the growth of the human population. Pollution of natural and wastewater is most often due to the release of heavy metals into watercourses. The greatest challenge for researchers is choosing the right biomass from a large number of low-cost biomaterials, and availability and price are very important selection factors. Microbial biomass, forestry waste and agroindustrial complexes are most frequently examined, as well as various macromolecules of natural origin. In this paper, barley straw that arises as agricultural waste product in barley production in Bosnia and Herzegovina, was used as a biosorbent. In the experimental part, physical and chemical characterization of barley straw was performed, after which the efficiency of removing Cd(II) and Ni(II) from aqueous solutions, using barley straw, and the influence of process parameters (pH value of aqueous solution, biosorbent size, interaction of metal ions) on the biosorption capacity were tested. It can be concluded that barley straw has good adsoption characteristics for the use as a low-cost natural sorbent for the removal of heavy metals from water.

All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.

Construction materials in the form of any products are subject to unintentional or harmful change... more Construction materials in the form of any products are subject to unintentional or harmful changes, occurrences and processes that reduce their usability. The destruction of construction materials is aimed to be slowed down or prevented by measures and procedures of a special technological discipline - material protection, which is usually called surface protection, since harmful occurrences and processes mostly begin on the surface of the product. In addition to the many protective methods that are used, corrosion inhibitors have a special place due to their specificity and widespread use. Based on the performed tests and their analysis, it was determined that the inhibition efficiency obtained by electrochemical measurements is in good correlation with the results obtained by the FTIR method. Impedance measurements of steel St 37-4 Pectin C in the tested media show corrosion resistance. Pectin C in 3.5% HCl at a concentration of 2.0 g / l increases the value of the charge transfer...

Biosensors for Environmental Monitoring, 2019

Biosensors are nowadays a powerful alternative to conventional analytical techniques for controll... more Biosensors are nowadays a powerful alternative to conventional analytical techniques for controlling the quality of not only natural water but also process water used by the food industry during the production process, as well as wastewater prior to release into natural watercourses. The goal is to provide the required quality and safety of water from the standpoint of heavy metal contamination. The basic and most important characteristics of biosensors are high sensitivity, short response time, specificity, and relatively low production cost. Biosensors can detect the presence and measure the content of various toxic substances (pesticides, heavy metals, etc.) not only in water but also in food. Detection of contaminants, primarily heavy metals in water used in food production processes, is a potential area of biosensor application in the food industry. Biosensors can be adapted for direct and continuous (online) monitoring by measuring certain analytes that can affect the quality and safety of water. This chapter will give an overview of the development and application of biosensors in order to control the quality and safety of water from the standpoint of the presence of heavy metals.

Water quality is deteriorating over the years, and the main source of water pollution is industri... more Water quality is deteriorating over the years, and the main source of water pollution is industrial, agricultural and municipal wastewater. Heavy metals, organic compounds and microorganisms, present even in traces, can be very dangerous to human health, aquatic organisms and the environment. Therefore, in this study was investigate the possibility of modified and unmodified plum pits as biosorbents for Pb (II) ions removal from aqueous solution. Experimental data have shown that these bisorbents show a certain potential for application in the metal removal process. The feasibility was tested for an unmodified and modified biosorbent based on plum pits in the range of concentrations 150-200 mg/l (unmodified sample) and 100-200 mg/l (modified sample) at a contact time of 30 and 60 minutes . Adsorption parameters were determined using the Freundlich isotherm. The results showed that unmodified biosorbent based on plum pits with increasing concentration from 150 mg/L to 200 mg/L leads ...

The natural plant Cornus mas, sometimes called Cornelian cherry, has been known since ancient tim... more The natural plant Cornus mas, sometimes called Cornelian cherry, has been known since ancient times and the fruit is used for various purposes. Cornus mas gives healthy fruits without the use of chemical protection, which are used as healthy, tasty and medicinal food. Cornus mas fruits can be used for eating fresh or in the form of numerous processed products: marmalade, jam, sweet, compote, syrup, juice, fruit yogurt, liqueur, wine and brandy. Due to its antioxidant, antiallergic, antimicrobial and antihistamine properties, it is increasingly used as a dietary supplement, as well as for medical purposes. Taking into account all the above, the aim of this paper is to examine samples of a mixture of honey and fresh wild Cornelian cherry, as well as a sample of honey and Cornelian cherry and determine the physical - chemical parameters: electrical conductivity, pH value, vitamin C content, HMF (hydroxy methyl furfural), as well as individual heavy metals such as iron, cadmium, lead, z...

Medicinal plants have become an increasing subject of interest worldwide due to the large amount ... more Medicinal plants have become an increasing subject of interest worldwide due to the large amount of biologically active substances that have potential beneficial health properties. One of the more interesting popular medicinal plants is hawthorn (Crataegus spp.), a deciduous branched shrub that is increasingly used for health purposes. Various parts of this plant, including berries, flowers and leaves, are rich in nutrients and beneficial bioactive compounds that are effective in the treatment of numerous diseases. Honey is a natural sweetener produced by bees from plant secretions. Known for its nutritional and medicinal values, it gives strength to the body, which is why it is indispensable in the human diet. The combination of these two ingredients represents a significant source of vitamins and minerals in daily use, but also for use in various pharmaceutical and medical purpose. Taking into account all of the above, the aim of the work is to test samples of the mixture of honey and hawthorn in different proportions and determine the physical and chemical characteristics: pH value, electrical conductivity, refractive index, viscosity, water activity, HMF, DPPH. Based on the analysis, appropriate conclusions will be drawn and more information will be obtained about their quality and possible use as a food supplement. On the basis of the conducted analyses, it can be concluded that the parameter values are within the permitted limits defined by the Rulebook (Official Gazette Bosnia and Herzegovina No. 37/09). The analysis of the mentioned parameters showed that the chemical composition of the sample plays a major role in the value of the measurement results, and that Sample III has the best antioxidant properties.

Prirucnik daje pregled znacaja voca i povrca u prehrani, promjena na vocu i povrcu nakon branja, ... more Prirucnik daje pregled znacaja voca i povrca u prehrani, promjena na vocu i povrcu nakon branja, te tehnologije cuvanja svježeg voca i povrca i vrsta i tipova hladnjaca.

Greenhouse production is getting more and more important in the production of food, particularly ... more Greenhouse production is getting more and more important in the production of food, particularly if it is considered as ecological production. Having it in mind, it is very important to provide continual control of quality such products. This work is aimed to present the monitoring of the content of heavy metals in tomato, grown in greenhouse conditions. In products grown in greenhouses, heavy metals can be present from different sources such as soil, pesticides, etc. This paper considers the importance of continual monitoring of presence of heavy metals, such as cadmium, lead, copper, iron, etc. in tomato, taking in consideration their bioavailability to plants in acid and basic soil conditions. Obtained results in this work could be used as the base for establishing the model for continual monitoring of contaminants in food, particularly those that are present in very small concentrations, such as lead, cadmium, etc.

International journal for research in applied sciences and biotechnology, Apr 8, 2022

In this research, the results of bentonite characterization (pH value of bentonite suspension, po... more In this research, the results of bentonite characterization (pH value of bentonite suspension, point of zero charge, cation exchange capacity, SEM, XRF, DTG) are presented. The results of lead (II) removal efficiency at initial lead (II) concentrations of 200, 300 and 400 mg/L, and biosorbent dosage of 1 gram in 50 ml of lead (II) solution, are also presented, as well as the values of the Freundlich and Langmuir constants from the Freundlich and Langmuir adsorption isotherms. The obtained results showed that removal efficiency is high for all three examined initial lead (II) concentrations, and it is above 99%. The lead (II) removal efficiency slightly decreases with an increase in initial lead concentration. Experimental data obtained from adsorption experiment with contact time of 2.5 minutes, stirring rate 100 rpm, temperature 25 0 C and pH value 5 are better fitted with the linearized Langmuir equation isotherm, giving an R 2 value closest to unity (0.9994), than to linearized Freundlich equation (0.9886).

International journal of materials and chemistry, 2018

In this paper, two different groups of liquid soaps were prepared. The first group of samples con... more In this paper, two different groups of liquid soaps were prepared. The first group of samples consisted of anionic surfactant (SLES), amphoteric surfactant (BETAIN) and nonionic surfactant (DEA). The second set of samples consisted of anionic surfactant and two nonionic surfactants. The aim of this work is to investigate the influence of the type of surfactant as well as the mass fraction of surfactants on the physicochemical properties of liquid soap. The surface tension, electrical conductivity and density for different concentrations of all examined type of surfactants have been determined as well as the critical micelle concentration (CMC). Moreover, the studies have shown that by increasing concentrations of zwitterionic (amphoteric) surfactant, and by decreasing concentration of nonionic surfactant, a mild decrease in pH value and viscosity increase occurred. In contrast, with increasing polyglycoside concentrations and decreasing concentration of DEA, a mild increase in pH but a decrease in viscosity was observed. In order to monitor the stability of the liquid soaps obtained, the appearance, color and odor were observed at three different temperatures at +4°C, room temperature and at + 40°C, in the dark and under UV light during the three months.

VOL. 2, NO. 3 (2022)

Water hardness and deposition of incrustation is a problem in households and industry. In this re... more Water hardness and deposition of incrustation is a problem in households and industry. In this regard, several technologies have been developed with the purpose of water softening and preventing the deposition of incrustation. The ion exchange method is the most commonly used method and is considered a conventional method. However, due to the shortcomings of this method, there is a need to develop adequate alternative methods. The potential of the method using biosorbents such as moss Leucobryum glaucum and Spaghnum peat moss for the purpose of removing water hardness has recently become the subject of intensive research with growing interest. In this study, the method using Leucobryum glaucum as a biosorbent was tested and a comparison was made with the conventional method and previously conducted studies that used other biosorbents.

Annual Research & Review in Biology

In this article, the corrosion inhibition of steel DIN 2391 St 37-4 in acidic medium 5% H2SO4 wit... more In this article, the corrosion inhibition of steel DIN 2391 St 37-4 in acidic medium 5% H2SO4 with and without the presence of eco inhibitors of leaf (Petroselinum Sativum) was examined. Inhibitory properties of parsley leaves (Petroselinum Sativum) on steel DIN 2391 St 37-4 were examined by potentiodynamic polarization - Tafel extrapolation, and FTIR method in order to categorize the oxide layer. The test was performed in static medium and with stirring at 600 rpm. By Tafel extrapolation based on changes in corrosion potential, the inhibitor behaves as mixed. Increasing the concentration of inhibitors increases the efficiency of inhibition. Corrosion processes are inhibited by adsorption of organic matter on the surface of steel DIN 2391 St 37-4, forming a film. The obtained results indicate that parsley leaf (Petroselinum Sativum) is an effective eco inhibitor for the tested steel in 5% sulfuric acid.

International Research Journal of Pure and Applied Chemistry, 2021

In this research, the possibility of using Ca(OH)2 in the form of commercial hydrated lime as a c... more In this research, the possibility of using Ca(OH)2 in the form of commercial hydrated lime as a catalyst for the methanolysis of refined rapeseed oil was evaluated. Characterization of unused catalyst was performed by SEM-EDS, laser diffraction, XRF, BET, XRD and TG/DTG methods, and vegetable oil was analyzed for physicochemical characteristics. Within methanolysis, the effects of catalyst loading, reaction temperature and reaction time on methyl ester yield, density and viscosity of biodiesel, as well as the possibility of catalyst reuse were investigated. The obtained results showed that hydrated lime is an efficient catalyst for transesterification of vegetable oil, whereby the use of 3 wt% of catalyst relative to oil weight, at temperature 60℃ and mixing rate 1000 rpm after 120 min of transesterification reaction achieved a yield of methyl esters 98.76%. With three reuses of hydrated lime, without intermediate washing and regeneration procedures, the yield of rapeseed oil methyl...

Journal of Radioanalytical and Nuclear Chemistry, 2022

Red beet peel was utilized for U(VI) removal in a batch system. The characterization of prepared ... more Red beet peel was utilized for U(VI) removal in a batch system. The characterization of prepared biosorbent was performed by Fourier transform infrared spectroscopy, energy dispersive X-ray fluorescence spectroscopy, scanning electron microscopy, energy dispersive spectroscopy analysis and pH point of zero charge was also determined. Removal of uranium was favourable at pH 7.00 with biosorption capacity of 41.21 mg/g, and results showed that used biosorbent exhibits selectivity for U(VI) ions. Obtained data showed very good agreement with Langmuir’s and Freundlich’s models. Experimental results fitted very well to pseudo-second order model and thermodynamics showed spontaneous nature of biosorption process.

Soil is system, where heavy metals, such as lead, cadmium, copper, etc., can be present in higher... more Soil is system, where heavy metals, such as lead, cadmium, copper, etc., can be present in higher concentration then it is usual. Heavy metals are usually present in soil, bounded to clay, but if some conditions, such as pH, acidity, have been changed, then they are released to the soil solution. This work is going to present factors, such as pH, acidity, organic matter content, etc., which have impact on releasing of heavy metals to the soil, and forward to plants. The content of heavy metals in soil solution, such as lead, copper, etc. depend on above mentioned factors, and for different soil conditions, such as organic matter and pH, as the most important factor for binding and releasing of heavy metals from and to soil will be presented.

International Journal for Research in Applied Sciences and Biotechnology, 2018

The problem of environmental pollution is more expressed and more present by the development of t... more The problem of environmental pollution is more expressed and more present by the development of the industry and the growth of the human population. Pollution of natural and wastewater is most often due to the release of heavy metals into watercourses. The greatest challenge for researchers is choosing the right biomass from a large number of low-cost biomaterials, and availability and price are very important selection factors. Microbial biomass, forestry waste and agroindustrial complexes are most frequently examined, as well as various macromolecules of natural origin. In this paper, barley straw that arises as agricultural waste product in barley production in Bosnia and Herzegovina, was used as a biosorbent. In the experimental part, physical and chemical characterization of barley straw was performed, after which the efficiency of removing Cd(II) and Ni(II) from aqueous solutions, using barley straw, and the influence of process parameters (pH value of aqueous solution, biosorbent size, interaction of metal ions) on the biosorption capacity were tested. It can be concluded that barley straw has good adsoption characteristics for the use as a low-cost natural sorbent for the removal of heavy metals from water.

All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.

Construction materials in the form of any products are subject to unintentional or harmful change... more Construction materials in the form of any products are subject to unintentional or harmful changes, occurrences and processes that reduce their usability. The destruction of construction materials is aimed to be slowed down or prevented by measures and procedures of a special technological discipline - material protection, which is usually called surface protection, since harmful occurrences and processes mostly begin on the surface of the product. In addition to the many protective methods that are used, corrosion inhibitors have a special place due to their specificity and widespread use. Based on the performed tests and their analysis, it was determined that the inhibition efficiency obtained by electrochemical measurements is in good correlation with the results obtained by the FTIR method. Impedance measurements of steel St 37-4 Pectin C in the tested media show corrosion resistance. Pectin C in 3.5% HCl at a concentration of 2.0 g / l increases the value of the charge transfer...

Biosensors for Environmental Monitoring, 2019

Biosensors are nowadays a powerful alternative to conventional analytical techniques for controll... more Biosensors are nowadays a powerful alternative to conventional analytical techniques for controlling the quality of not only natural water but also process water used by the food industry during the production process, as well as wastewater prior to release into natural watercourses. The goal is to provide the required quality and safety of water from the standpoint of heavy metal contamination. The basic and most important characteristics of biosensors are high sensitivity, short response time, specificity, and relatively low production cost. Biosensors can detect the presence and measure the content of various toxic substances (pesticides, heavy metals, etc.) not only in water but also in food. Detection of contaminants, primarily heavy metals in water used in food production processes, is a potential area of biosensor application in the food industry. Biosensors can be adapted for direct and continuous (online) monitoring by measuring certain analytes that can affect the quality and safety of water. This chapter will give an overview of the development and application of biosensors in order to control the quality and safety of water from the standpoint of the presence of heavy metals.

Water quality is deteriorating over the years, and the main source of water pollution is industri... more Water quality is deteriorating over the years, and the main source of water pollution is industrial, agricultural and municipal wastewater. Heavy metals, organic compounds and microorganisms, present even in traces, can be very dangerous to human health, aquatic organisms and the environment. Therefore, in this study was investigate the possibility of modified and unmodified plum pits as biosorbents for Pb (II) ions removal from aqueous solution. Experimental data have shown that these bisorbents show a certain potential for application in the metal removal process. The feasibility was tested for an unmodified and modified biosorbent based on plum pits in the range of concentrations 150-200 mg/l (unmodified sample) and 100-200 mg/l (modified sample) at a contact time of 30 and 60 minutes . Adsorption parameters were determined using the Freundlich isotherm. The results showed that unmodified biosorbent based on plum pits with increasing concentration from 150 mg/L to 200 mg/L leads ...

The natural plant Cornus mas, sometimes called Cornelian cherry, has been known since ancient tim... more The natural plant Cornus mas, sometimes called Cornelian cherry, has been known since ancient times and the fruit is used for various purposes. Cornus mas gives healthy fruits without the use of chemical protection, which are used as healthy, tasty and medicinal food. Cornus mas fruits can be used for eating fresh or in the form of numerous processed products: marmalade, jam, sweet, compote, syrup, juice, fruit yogurt, liqueur, wine and brandy. Due to its antioxidant, antiallergic, antimicrobial and antihistamine properties, it is increasingly used as a dietary supplement, as well as for medical purposes. Taking into account all the above, the aim of this paper is to examine samples of a mixture of honey and fresh wild Cornelian cherry, as well as a sample of honey and Cornelian cherry and determine the physical - chemical parameters: electrical conductivity, pH value, vitamin C content, HMF (hydroxy methyl furfural), as well as individual heavy metals such as iron, cadmium, lead, z...

International Research Journal of Pure & Applied Chemistry, 2021

To understand the bio-geochemical distribution, activities and environmental consequences of heav... more To understand the bio-geochemical distribution, activities and environmental consequences of heavy metals, it is very important to know their physico-chemical form and the conditions under which the transformation from one form to another occurs. The bioavailability of heavy metals directly depends on the physico-chemical conditions of the environment, the concentration of anions and cations in water, the content of heavy metals as well as the ionic strength. Depending on the physico-chemical properties of water, metals are found in water as free ions or as complex compounds. Their change in the form in which metals occur is significantly influenced by pH, temperature, alkalinity, water hardness, organic matter, and biological activity. The total concentration of metal in water is only an indicator of pollution, and it is necessary to determine the form of the metal. Differential Pulse Anode Stripping Voltammery with mercury electrode was used for determination of chemical speciation. Manganese belongs to the group of essential heavy metals if its concentration does not exceed the maximum allowed value.