Microwave Digestion Procedure Research Articles

Comparison of Dry, Wet and Microwave Digestion Procedures for the Determination of Heavy Metal in Yoghurt Samples

Abstract: This work proposes a novel technique for utilizing the most suitable digestion process to determine concentrations of heavy metals such as Pb, Cd, Al, As, Zn, and Fe in Yoghurt samples using AAS. Conventional digestion techniques often involve time-consuming and tedious procedures, which leads to the loss of analyte and reduced accuracy. In this study, we propose the utilization of microwave-assisted digestion, a rapid and efficient technique that offers complete digestion of the samples and minimizes the risk of analyte loss. In order to get optimal efficiency and precision, this study outlines the optimization of the microwave-assisted digestion parameters, such as power, time, and reagent concentrations. The proposed method was validated by calculating the recovery % among dry, wet and microwave digestion methods. Results show that among all, the recovery percentage was found to be highest in the microwave digestion method.

Trifunctional Fe3O4@MIP nanocatalytic probe-gold nanosol SERS quantitative analysis of ultratrace dinotefuran

A new trifunctional magnetic nanosurface imprinted polymer (MMIP) nanoprobe (Fe3O4@MIP) were rapidly prepared by microwave digestion procedure, and the nanoprobe was characterized in details. It was found that the nanoprobe not only could specifically recognize dinotefuran (DNT), but also could catalyze the HAuCl4-pyruvate indication reaction to produce gold nanoparticles (AuNPs). The generated AuNPs have strong surface enhanced Raman scattering (SERS) effect using VB4r as molecular probes, resonant Rayleigh scattering (RRS) and surface plasmon resonance absorption (Abs) effect. After adding DNT, it specifically combined with Fe3O4@MIP to form Fe3O4@MIP-DNT conjugates with weak catalytic activity, and the SERS/RRS/Abs signal decreased linearly. Based on this, a new SERS/RRS/Abs trimode sensing platform was constructed for detection DNT with detection limit of 0.009, 0.01 and 0.35 nmol/L, respectively. Due to the unique magnetic properties of the nanoprobe, DNT could be easily and quickly identified, separated and enriched, the enrichment factor was up to 100 times. As a comparison, we also investigated the catalytic and specific recognition effects of MMIP nanoprobes prepared with different neonicotinoid insecticides template molecules and functional monomers.

Comparisons of Different Digestion Methods for Heavy Metal Analysis from Fruits

Fruit juices are produced in home or industrially from horticultural crops by pressing the liquid part. They are rich in sugar, vitamins, and minerals like iron, copper, potassium, folate minerals, and vitamins A, B, and C which are essential for giving the body the nutrients it needs to stay healthy since fruits contain vital mineral components like copper (Cu), iron (Fe), and manganese (Mn), which is necessary for human growth and respiration. However, they may have heavy metals which may poison health risk and toxic even the presence is in little amount. Since fruit juices doesn’t pass through different processes, except extracting the liquid from the fruits of vegetables contamination and heavy metals affect human health. Before determination of heavy metals different procedures are applied for analysis. Digestion is the key component for determination of heavy metals from different samples. In this paper we are concerned on wet digestion methods for analysis. Closed system wet digestion is preferred since it lower the risk of contamination. There are different wet digestion types. Some of them are conventional wet digestion, ultraviolet digestion, ultrasound-assisted acid decomposition, conventional heating, microwave-assisted wet digestion etc. From thus, microwave digestion procedure was preferred for the digestion of samples for determination of heavy metals due to its ability to oxidize almost all of the organic samples.

Recognition and nanocatalytic amplification of binary MXene carbon dot surface molecularly imprinted nanoprobe for determination of thiamethoxam by molecular spectroscopy

In this experiment, using MXene quantum dot (MQD) as the core and thiamethoxam (TMX) as the template, a dual-functional surface molecularly imprinted polymer nanoprobe (MQD@MIP) for detecting of TMX was synthesized by microwave digestion procedure. And MQD@MIP was characterized in detail. It was found that this nanoprobe had dual function, which not only could specifically recognize TMX, but also could strongly catalyze the new indicator reaction of HAuCl4-maleic acid to produce gold nanoparticles (AuNPs). The AuNPs exhibit strong surface enhanced Raman scattering (SERS), resonance Rayleigh scattering (RRS) and surface plasmon resonance absorption (Abs) effect. Based on this, a new SERS/RRS/Abs trimode biosensoring platform was constructed for the determination of TMX, with a linear range of 1.0–150, 1.0–150, and 5.0–125 nmol/L TMX, and detection limit of 0.57 nmo/L, 0.84 nmol/L and 3.5 nmol/L, respectively. As a comparison, we used carbon dots (CDs) as the core to prepare surface molecularly imprinted polymers (CD@MIP) nanoprobe, and investigated the catalytic effect on the nanogold indicator reaction and the specific recognition effect on TMX.

Modeling of Atmospheric Dispersion of Jarosite Particles from Tailing Waste in Mitrovica, Kosovo

Most of the zinc producers in the world use the jarosite process to improve zinc recovery and to remove iron as an undesirable constituent of zinc ores. Jarosite waste released from the zinc extraction process in Mitrovica, Kosovo has led to severe environmental problems due to toxic heavy metals. This industrial waste from the Zn hydrometallurgy process was abandoned on an open field, being exposed to meteorological conditions and aging. The chemical composition and grain size distribution of the jarosite waste deposit was determined. Microwave digestion procedures were used on whole jarosite samples for use in inductively coupled plasma optical emission spectrometry trace metal analysis (ICP-OES). In addition, different weathering conditions were considered for testing the emission rate of the particles in the laboratory, including relative humidity, wind speed, and temperature. Terrain properties, urban infrastructure, source formation, and location were used for modeling with the AERMOD View-Gaussian air dispersion model. The modeling results showed a range of pollution exceeding the maximum limits in an area of 3 km in the conditions of southeast wind direction and wind speed exceeding 10 m s−1, heavily polluting the city of Mitrovica.

Metals determination in the whole blood by ICP-OES: a comparison of two digestion procedures

ABSTRACT The anomalous increases or deficits in the human body can be detected by the development of accurate and sensitive methods for metal quantification in low-level concentrations. Two digestion procedures have been tested on whole blood samples for use in inductively coupled plasma optical emission spectrometry trace metal analysis (ICP-OES). The two procedures are, (microwave digestion with nitric acid and hydrogen peroxide), and (simple dilution digestion with nitric acid, N-butanol, and Triton X-100). According to the findings, the overall recoveries of all determining metals for the microwave digestion were in the range of (96%) of the expected levels, whereas for simple dilution digestion they were in the range of (85–88%) of the expected levels. The results showed a significant difference in the recovery ratios in favor of lead (Pd) and cadmium (Cd) between simple dilution and microwave digestion procedures. The findings also show that the content of these metals may be reliably measured using simple dilution and microwave digestion procedures. Abbreviations: ICP-OES: Induction coupled optical emission spectroscopy; LOD: Limit of detection; LOQ: Limit quantification; AAPCC: American Association of Poison Control Centers; NAUSS: Naif Arab University for Security Sciences; %RSD: Relative standard deviation).

Potential Health Risks of Macro- and Microelements in Commercial Medicinal Plants Used to Treatment of Diabetes.

Information on the content of medicinal plants used in the treatment of diabetes is scarce in the literature. The objectives of this study were to determine the levels of macroelements and microelements in three different medicinal plant species including the dry samples and teas from Bauhinia forficata, Eleusine Indica, and Orthosiphon stamineus and assess the human health risks of ingestion of the tea. The content of the dry samples and teas was obtained using the technique of inductively coupled plasma optical emission spectrometry (ICP OES) after microwave digestion procedure. The hazard quotient (HQ) method was used to access the human health risks posed by heavy metal through tea consumption. The results revealed the presence of K, Mg, Na, P, Al, Fe, Zn, Mn, Cu, Ni, and Se in dry samples and plant teas. The dry plants have high concentration of K and P. All dry plants contain Mg, Na, Al, Fe, Mn, Ni, Zn, and Cu above the limit permissible level set by the World Health Organization (WHO). All the hazard index (HI) values in plant teas were found to be within safe limits for human consumption (HI < 1). The plants may have possible action benefits when used in popular medicine. However, the ingestion through capsules prepared by enclosing a plant powder or teas can be harmful to the health of diabetics. The prescription of this plant for the treatment of diabetes should be treated with caution.

Factorial Design Optimization of Microwave Digestion for Macro and Microelements in Pregnant Women and Diabetics Multivitamin/Multielement Preparations by Inductive Coupled Plasma Mass Spectrometry (ICPMS)

In the present work, the microwave digestion procedure for the determination of Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Se, V and Zn in multivitamin/multielement (MVM) preparations used for pregnant women and diabetics employing ICP-MS, was optimized by factorial design 33 (27 runs). The microwave digestion conditions temperature (160, 180 and 200oC), acid mixture volume (3.9, 5.2 and 6.5 ml) and radiation period (10, 15 and 20 min) were selected as factors. Moreover, a multiple response (MR) was built to establish a compromise conditions between the elements. The optimum conditions were found to be 160oC, 6.5 ml, 20 min for temperature, acid mixture volume and radiation period, respectively. The procedure was validated using standard reference material (SRM3280) and elements recoveries were found to be in the range 88 - 107% and was applied to determination of Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Se, V and Zn in commercial MVM samples obtained from the local market.

Determination of Major, Minor, and Toxic Elements in Tropical Fruits by ICP-OES After Different Microwave Acid Digestion Methods

Fruits contain nutrients, minerals, trace elements, vitamins, and phytochemicals that are important in terms of human health. When fruits are consumed in a balanced diet, they have a positive effect with regard to reducing disease risk. As a result of heavy metal contamination of the environment, they can be a potential source of toxic elements so it is important to determine the toxic, essential, and trace elements in fresh fruit and commercial fruit products such as fruit juice, marmalade. This study aims to determine the concentrations of Al, B, Ca, Cu, Fe, K, Mg, Mn, Na, Zn, P, and S in tropical fruits (tamarind (Tamarindus indica), star fruit (Averrhoa carambola), golden berry (Physalis peruviana), kumquat (Citrus japonica), dragon fruit (Hylocereus undatus), passion fruit (Passiflora edulis)) by using inductively coupled plasma optical emission spectrometry (ICP-OES) after different microwave acid digestion procedures. The efficiencies of digestion in tropical fruit samples were investigated and compared. Six milliliters of HNO3 + 2 mL of H2O2, 6 mL of HNO3 + 2 mL of HCl, 8 mL of HNO3, 8 mL of HNO3 + 4 mL of H2O2 (30%), 8 mL of HNO3 + 4 mL of HCl, and 12 mL of HNO3 were used for microwave acid digestion procedures. Microwave digestion procedures were applied for the analysis of seventy-two tropical fruit samples purchased in triplicate for each tropical fruit and major, toxic, and minor element contents of tropical fruits were determined. The parameters of the merit evaluated were validated according to limits of detection (LOD) and limits of quantification (LOQ), linearity, recovery, and precision. The highest results of LOD and LOQ were found for Ca, K, Na, Mg, and S. The recovery percentages are in the range from 71.01 to 117.31% in tropical fruits. The digestion efficiency was correlated with the residual carbon content, which was determined by total organic carbon analyzer (TOC). Six milliliters of HNO3 + 2 mL of HCl digestion method was chosen as the effective digestion method because of the lowest residual carbon contents and the accuracy results.

Comparison of microwave, dry and wet digestion procedures for the determination of trace metal contents in spice samples produced in Turkey

The concentrations of trace metals (Pb, Cd, Cr, Ni, Fe, Cu, Mn and Zn) in spice samples from Turkey were determined because similar studies have not been published. The experiments were carried out using atomic absorption spectrometry after dry ashing, wet ashing and microwave digestion methods. The study of sample preparation procedures showed that the microwave method was the best. The proposed method showed satisfactory recovery, detection limits and standard deviation for trace metal determination in spice samples. The concentrations of Pb, Cd, Cr, Ni, Fe, Cu, Mn and Zn in the samples were in the range of 0.47-1.89, 0.10-0.93, 0.67-7.15, 0.65-8.69, 88.9-376.3, 4.1-28.7, 11.9-211.3 and 7.84-47.6 μg/g, respectively. Correlations between metal concentrations were evaluated.

Comparison of digestion procedures on commercial powdered soup samples for the determination of trace metal contents by atomic absorption spectrometry

The concentrations of copper, manganese, zinc, iron and aluminum in commercial powdered soup samples produced in Turkey were determined using flame and graphite furnace atomic absorption spectrometry. We compared wet, dry and microwave digestion procedures for the digestion of the soup samples. The microwave digestion procedure for the soup samples was demonstrated to be most effective due to its simplicity and quick results. The accuracy of the method was checked against a standard reference material (SRM 8418 Wheat Gluten). Contents of investigated trace metals in soup samples ranged between 0.41 and 4.78 μg/g for copper, 1.29 and 49.4 μg/g for manganese, 1.26 and 22.5 μg/g for zinc, 4.62 and 61.7 μg/g for iron, and 6.86 and 547.7 μg/g for aluminum. The results were compared with values reported in the literature.

Extraction of Cu, Fe, Mn, and Ni from Margarine Samples Using Extraction Induced by Emulsion Breaking Procedure Prior to Graphite Furnace Atomic Absorption Spectrometry and Comparison of Results to Provisional Tolerable Daily Intake Values.

The emulsion induced by emulsion breaking (EIEB) procedure was previously reported for the extraction of copper, iron, manganese, and nickel from liquid oil samples such as vegetable oil. To optimize the EIEB procedure for determination of copper, iron, manganese, and nickel in solid oil (margarine) samples by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The extraction procedure uses a surfactant in nitric acid to form an emulsion followed by heating to break the emulsion. Optimization included variation of the test portion size, the type and concentration of the surfactant, the concentration of nitric acid in the aqueous solution, the emulsion agitation time, heating temperature, and the time required to break the emulsion. Mean element concentrations of 11 margarine samples were in the following ranges: Cu 0.031-0.131 µg/g, Fe 5.7-24.9 µg/g, Mn 0.542-1.11 µg/g, and Ni 0.108-0.134 µg/g. Under the optimized extraction conditions, the detection limits (µg/kg) were 4.8, 13, 1.5, and 23 for Cu, Fe, Mn, and Ni, respectively. The accuracy of the extraction procedure was determined by comparison to commonly used microwave digestion procedure. The EIEB results were not statistically different from the microwave digestion results when analyzed by GFAAS as determined by the statistical tests. The EIEB procedure was shown to be equivalent to the commonly used microwave digestion procedure for extraction of analytes from margarine samples. The optimized EIEB extraction procedure is simple, rapid, low cost, and environmentally friendly. It has improved detection limits and allows calibration with aqueous standards.

Determination of Trace and Major Elements in Vegan Milk and Oils by ICP-OES After Microwave Digestion.

Increasing technological developments also bring about environmental pollution. Heavy metals and metallic compounds, as a result of soil, water, and air industrialization, pass through to people and animals through the food chain and have a negative impact on health. In this study, the concentrations of Na, Mg, K, Ca, P, Fe, Cu, B, Mn, Zn, Al, S, As, Bi, Cd, Co, Cr, Mo, Ni, Pb, Pt, Sb, Se, Sn, Ti, W, and Hg in commercial vegan milk (soybean milk, coconut milk, and almond milk) and oils (soybean oil, coconut oil, bitter almond oil, sweet almond oil, and walnut oil) were determinated using inductively coupled plasma-optical emission spectrometry after microwave digestion. In order to compare the efficiencies of digestion in vegan milk and oil samples, 6mL of HNO3 (conc.), 3mL of H2O2 (30%); 7mL of HNO3 (conc.), 3.5mL of H2O2 (30%), and 8mL of HNO3 (conc.), 4mL of H2O2 (30%) were used in microwave digestion procedures. The proposed procedures were applied to the analysis of 81 vegan milk and 125 vegan oil samples covering three different brands in Turkey. Na, Mg, K, Ca, P, S, Mn, Zn, Cu, B, Sb, and Sn concentrations in vegan milks ranged (minimum-maximum in ppm) as follows: 307.4-501.2, 1.8-15.6, 478.8-1300.4, 276.3-1189, 197-797.8, 18.7-241.4, 0.09-0.42, 0-0.58, 0.02-1.06, 0.34-1.56, 0.26-0.67, and 3.4-30.4ppm, respectively. The results of Na, K, Ca, P, Mg, S, Mn, Zn, Se, Fe, Cu, Sb, and Sn concentrations in vegan oils (minimum-maximum in ppm) ranged as follows: 6.8-31.2, 403.5-425.2, 142.8-160.4, 71.65-149.8, 0.35-0.85, 14.2-35.2, 0.02-0.27, 0.07-0.36, 1.90-4.64, 0.92-5.36, 0.01-0.05, 1.02-1.66, and 21.2, 35.0ppm, respectively. Vegan milk contents except for Se, Fe, Sb, and Sn in this study were higher than vegan oil contents. The methods were validated by linearity, limits of detection and quantification, precision, and analyzing certified reference material (NIST SRM-3235), soybean milk. The highest values of LOD were found Pb, P, and Bi, and the highest values of LOQ were found Mo, Pb, and Sb.

Microwave and open vessel digestion methods for biochar

Digestion of biomass derived carbonaceous materials such as biochar (BC) can be challenging due to their high chemical recalcitrance and vast variations in composition. Reports on the development of specific sample digestion methods for such materials remain inadequate and thus require considerable attention. Nine different carbonaceous materials; slow-pyrolyzed tea-waste and king coconut BC produced at 300 °C, 500 °C and 700 °C, sludge waste BC produced at 700 °C, wet fast-pyrolyzed Douglas-Fir BC and steam activated coconut shell BC have been tested to evaluate a relatively fast and convenient open-vessel digestion method using seven digestion reagents including nitric acid (NA), fuming nitric acid (FNA), sulfuric acid (SA), NA/SA, FNA/SA, NA/H2O2 and SA/H2O2 mixtures. From the tested digestion reagents, SA/H2O2 mixture dissolved low temperature produced BC (LTBC) within 2 h with occasional shaking and no external heating. Except peroxide mixtures, the other reagents were used to evaluate microwave digestion (MWD) efficiency. Nitric acid mixture was capable of only completely digesting LTBC in the MWD procedure whereas FNA, NA/SA and FNA/SA mixtures resulted in the successful dissolution of all tested carbonaceous materials. Amongst them, FNA provided the least matrix effect in the quantification of the four metals tested using flame atomic absorption spectrophotometry. Tested recoveries for FNA were satisfactory as well. It was concluded that FNA is a preferable reagent for microwave digestion of BC.

Preparation and purification of organic samples for selenium isotope studies.

Selenium (Se) is an important micronutrient but also a strong toxin with a narrow tolerance range for many organisms. As such, a globally heterogeneous Se distribution in soils is responsible for various disease patterns (i.e. Se excess and deficiency) and environmental problems, whereby plants play a key role for the Se entrance into the biosphere. Selenium isotope variations were proved to be a powerful tracer for redox processes and are therefore promising for the exploration of the species dependent Se metabolism in plants and the Se cycling within the Critical Zone. Plant cultivation setups enable systematic controlled investigations, but samples derived from them–plant tissue and phytoagar–are particularly challenging and require specific preparation and purification steps to ensure precise and valid Se isotope analytics performed with HG-MC-ICP-MS. In this study, different methods for the entire process from solid tissue preparation to Se isotope measurements were tested, optimized and validated. A particular microwave digestion procedure for plant tissue and a vacuum filtration method for phytoagar led to full Se recoveries, whereby unfavorable organic residues were reduced to a minimum. Three purification methods predominantly described in the literature were systematically tested with pure Se solution, high concentrated multi-element standard solution as well as plant and phytoagar as target matrices. All these methods efficiently remove critical matrix elements, but differ in Se recovery and organic residues. Validation tests doping Se-free plant material and phytoagar with a reference material of known Se isotope composition revealed the high impact of organic residues on the accuracy of MC-ICP-MS measurements. Only the purification method with no detectable organic residues, hydride generation and trapping, results in valid mass bias correction for plant samples with an average deviation to true δ82/76Se values of 0.2 ‰ and a reproducibility (2 SD) of ± 0.2 ‰. For phytoagar this test yields a higher deviation of 1.1 ‰ from the true value and a 2 SD of ± 0.1 ‰. The application of the developed methods to cultivated plants shows sufficient accuracy and precision and is a promising approach to resolve plant internal Se isotope fractionations, for which respective δ82/76Se values of +2.3 to +3.5 ‰ for selenate and +1.2 to +1.9 ‰ for selenite were obtained.

Determination of heavy metals concentration in traditional medicinal plants Ziziphus spinachristi, Withania somnifera and Ximenia americana by inductively coupled plasma optical emission spectrometery in Amhara Region of Ethiopia

The study of traditional medicinal plants attracted concerns of many researchers because they are not rigorously regulated. On the other hands, their potentiality for medicine use is still predominant in different part of the world today. In this study, heavy metals (copper, zinc, nickel and lead) concentrations were determined using inductively coupled plasma optical emission spectroscopy in three traditional medicinal plants: Ziziphus spina-christi, Ximenia americana, and Withania somnifera in northern part of Ethiopia. Microwave digestion procedure was applied under optimized conditions for digesting medicinal herbs. All the four heavy metals have been detected in this experiment. Results revealed that two of the investigated medicinal plants Ziziphus spina-christi and Winthania somnifera have showed concentrations within permissible levels for all the elements. The concentration of lead in Ximenia americana indicated a potential health risk to consumers in area as it was observed to be 55.20 ± 0.01 ppm

Proximate composition, lipid quality and heavy metals content in the muscle of two carp species

Abstract. The aim of the presented study was to characterize the quality of edible tissue of freshwater common carp (Cyprinus carpio) and bighead carp (Aristichthys nobilis), based on their proximate and lipid composition (lipid classes, fatty acid profile, fat soluble vitamins, carotenoids and cholesterol). Health risk assessment was evaluated based on the analysis of some toxic elements (As, Cd, Ni, Pb and total Hg). Proximate composition (moisture, crude protein and total lipid) was determined using standard procedures. Lipids were subsequently separated into neutral (NL) and polar lipids: Phospho- (PL) and Glycolipids (GL) by means of column and thin-layer chromatography. Lipid classes were derivatized into fatty acid methyl esters (FAMEs) which were analysed by gas chromatography–mass spectrometry (GC-MS). Vitamins A, D3 and E, beta-carotene, astaxanthin and cholesterol were analysed simultaneously using high performance liquid chromatography (HPLC). Heavy metals (As, Pb, Cd, Hg and Ni) were determined by optical emission spectrometry with inductively coupled plasma (ICP-OES) following a microwave digestion procedure. Protein content was higher in bighead carp (18.5%) and lower for common carp (15.5%), whereas lipid content showed opposite trend. Similarities in lipid classes distribution were observed for both species: NL&gt;GL&gt;PL. Neutral lipids constituted approximately 70% of TL in both species, as FAs profile was dominated by monounsaturated fatty acids (MUFA), whereas polyunsaturated FAs (PUFA) prevailed in polar fractions. Omega-3 PUFAs were higher in all lipid classes compared to omega-6 PUFAs. Cholesterol content was low (17-24 mg.100-1g ww). Astaxanthin was detected only in bighead carp, whereas beta-carotene, vitamin D3 and vitamin A showed similar concentrations in both samples. Vitamin E content was higher in bighead carp (10.4 mg.100 g-1 w.w.). Trace elements content was higher in bighead carp showing a maximum value of As (0.312 mg.kg-1 w.w). All determined toxic elements were found below the recommended value in carp muscle. The results of the present study confirmed the high quality and safety of common carp and bighead carp meat. These freshwater species are valuable sources of essential nutrients such as proteins, vitamin D3 and long chain omega-3 PUFAs. Together with the nutrients, the information for low concentrations of toxic elements makes them valuable components of a healthy human diet.

Macro and Trace Element Contents of Some Wild Plants Consumed as Vegetable in Manisa District, Turkey

In this study, macro elements (Na, Mg, Ca and K) and trace elements (Li, Fe, Zn, Mn, Se, Al, V, Cr, Ni, Cu, Pb, As, Co, Cd and Hg) in wild edible plant samples (Campanula sp, Anethum graveolens, Malva sylvestris, Onopordum tauricum, Cichorium endivia, Rumex patientia, Urtica diocia, Papaver rhaeas, Opopanax hispidus, Rumex acetosella, Eradium sp, Petroselinum crispum, Metha viridis, Eruca sativa, Sinapis arvensis, Lepidium sativum and Cardaria draba) grown in Mt. Yuntdağ and purchased from three different markets in Manisa district were analyzed using inductively coupled plasma-mass spectrometer after microwave digestion procedure. Selected plants for analysis are mostly consumed by people throughout the season. The mean concentrations of Na, Mg, Ca, K, Li, Fe, Zn, Mn, Se, Al, V, Cr, Ni, Cu, Pb, As, Co and Cd were determined as 201 to 15896, 1597 to 4783, 3676 to 13290, &amp;gt;20000, 0.27 to 4.37, 144 to 666, 18.0 to 52.0, 21.2 to 86.5, 0.08 to 0.25, 111 to 693, 2.18 to 5.67, 2.62 to 13.4, 1.32 to 6.30, 6.40 to 38.7, 0.12 to 0.78, 1.07 to 3.25, 0.05 to 0.47, 0.08 to 0.50 (µg g-1,dry weight), respectively. Hg values for plant samples were well below the detection limit of the method.

Antioxidant Activity and Chemical Composition of Methanolic Extract from Arum Dioscoridis Sm. var. Dioscoridis and Determination of Mineral and Trace Elements

Arum dioscoridis SM. var. dioscoridis ( A. dioscoridis ) which is a member of Arum L. genus and belonging to Araceae family was extensively analyzed in detail. DPPH free radical scavenging capacity of A. dioscoridis was obtained as 0.01091 mg gallic acid (GA) and 0.0929 mg Trolox (Tr) equivalent per mg of extract, respectively, based on DPPH free radical scavenging activity analysis. Chemical composition of A. dioscoridis was evaluated and 16 compounds were detected in the methanolic extract using GC-MS. Obtained compounds were assessed for their health benefits according to literature works. 20 elements were obtained in the m ineral and trace element analysis by ICP-MS using microwave digestion procedure .

Evaluation of Total Polyphenol Content, Antioxidant Activity and Chemical Composition of Methanolic Extract from Allium Kharputense Freyn et. Sint. and Determination of Mineral and Trace Elements

Allium kharputense Freyn Et. Sint. ( A. kharputense ) was analyzed for total polyphenol content, antioxidant activity, chemical composition and mineral and trace element composition. Total polyphenol content was determined as 257 mg GA 100 g -1 dried weight by using Folin-Ciocalteu method. DPPH test was performed for antioxidant activity analysis. IC 50 values of gallic acid and Trolox were determined as 0.02642 mg mL -1 and 0.225 mg mL -1 , respectively. IC 50 value of A. kharputense was found as 2.186 mg mL -1 . DPPH free radical-scavenging activity of extract from 1 mg of A. kharputense was determined 0.01207 mg GAE and 0.1029 mg TrE, respectively. GC-MS was used to determine chemical composition. Dimethyl trisulfide, methyl (methylthio)methyl disulfide, 2-Pyrrolidinone, 4-vinylphenol, 2-Phenylpyrrole , norharmane , linoleic acid, palmitic acid, γ-Tocopherol and α-Tocopherol are some of 40 compounds which were detected in methanolic extracts of A. Kharputense. 20 Mineral and trace elements were determined along with their levels by ICP-MS using microwave digestion procedure for preparing acid extracts.