3,393 results match your criteria microg g-1


Dispersive liquid-liquid microextraction for the isolation and HPLC-DAD determination of three major capsaicinoids in Capsicum annuum L.

Turk J Chem 2021 28;45(2):420-429. Epub 2021 Apr 28.

Department of Pharmacognosy, Faculty of Pharmacy, Near East University, Lefkoşa, TRNC, Mersin 10 Turkey.

Dispersive liquid-liquid microextraction (DLLME) was combined with high-performance liquid chromatography-diode-array detector (HPLC-DAD) for the extraction and quantitation of three major capsaicinoids (i.e. capsaicin, dihydrocapsaicin and nordihydrocapsaicin) from pepper ( L. Read More

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Distribution and Potential Availability of As, Metals and P in Sediments from a Riverine Reservoir in a Rural Mountainous Catchment (NE Portugal).

Int J Environ Res Public Health 2021 May 24;18(11). Epub 2021 May 24.

Chemistry Center Vila Real, Department of Geology, University of Trás-os-Montes e Alto Douro (UTAD), 5000-801 Vila Real, Portugal.

A geochemical investigation was carried out on the bottom sediments of a riverine reservoir, located in a mountainous rural region (NE Portugal), with the aim of evaluating the contents of As, metals and P and their potential availability. The elements contents were detected in the following ranges (µg g): As (18-64); Cr (32-128); Cu (39-93); Ni (18-80); Pb (49-160); Zn (207-334); P (1705-2681). The reducible fraction is the most significant in the retention of the elements. Read More

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In Vitro Propagation, Huperzine A Content and Antioxidant Activity of Three Genotypic .

Plants (Basel) 2021 May 31;10(6). Epub 2021 May 31.

College of Life Science, Jiangxi Normal University, Nanchang 330022, China.

is a traditional herb and endangered Chinese medicinal material, which has attracted much attention due to its production of Huperzine A (HupA). In vitro propagation of is considered a new way to relieve the resource pressure of . In this study, three different genotypic wild were used for in vitro propagation. Read More

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Comparative Studies of Selected Criteria Enabling Optimization of the Extraction of Polar Biologically Active Compounds from Alfalfa with Supercritical Carbon Dioxide.

Molecules 2021 May 18;26(10). Epub 2021 May 18.

Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.

The aim of this research was to provide crucial and useful data about the selection of the optimization criteria of supercritical carbon dioxide extraction of alfalfa at a quarter-technical plant. The correlation between more general output, including total phenolics and flavonoids content, and a more specified composition of polar constituents was extensively studied. In all alfalfa extracts, polar bioactive constituents were analyzed by both spectrometric (general output) and chromatographic (detailed output) analyses. Read More

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Citrate Mediated Europium-Based Detection of Oxytetracycline in Citrus Tissues.

Antibiotics (Basel) 2021 May 12;10(5). Epub 2021 May 12.

Citrus Research and Education Center, Department of Plant Pathology, IFAS, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850, USA.

Oxytetracycline (OTC) and streptomycin have been used for the control of several plant diseases and were recently permitted for the control of citrus greening disease, Huanglongbing. Consequently, sensitive and reliable methods are highly needed for the detection of OTC in citrus tissues. Herein, we studied the replacement of cetyltrimethylammonium chloride (CTAC) by citrate (Cit) as a sensitizing agent for the analysis of OTC in citrus tissues using the recently established europium (Eu) method. Read More

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Determination of 40 Elements in Powdered Infant Formulas and Related Risk Assessment.

Int J Environ Res Public Health 2021 May 11;18(10). Epub 2021 May 11.

Department of Public Health and Infectious Diseases, "Sapienza" University of Rome, 00185 Rome, Italy.

The aim of the study was to analyze all powdered infant formulas authorized and commercialized in Italy at the time of the study to measure the concentrations of 40 elements, and to estimate the infants' intake of some toxic heavy metals for assessing possible related health risks. For this purpose, an optimized multi-element method was used through inductively coupled plasma mass spectrometry. Be, B, Al, Zr, Nb, Sb, Te, W, V, Cr and As concentrations were Read More

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Herbs and herbal infusions: Determination of natural contaminants (mycotoxins and trace elements) and evaluation of their exposure.

Food Res Int 2021 Jun 22;144:110322. Epub 2021 Mar 22.

LAQV-REQUIMTE, Laboratory of Bromatology and Hydrology, Faculty of Pharmacy, University of Porto, Portugal. Electronic address:

Herbal infusions are amongst the world's most popular and widely enjoyed beverages, due to both large variety and convenience. However, natural contaminants, such as mycotoxins and trace elements can accumulate in aromatic herbs, which may have serious food safety and public health implications. In this study, the presence of mycotoxins, as well as the content of trace elements was evaluated in herbs and herbal infusions commercialized in Brazil. Read More

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Tannin foam immobilized with ferric ions for efficient removal of ciprofloxacin at low concentrations.

J Hazard Mater 2021 07 6;414:125567. Epub 2021 Mar 6.

College of Biomedical Engineering, Sichuan University, Chengdu 610065, PR China. Electronic address:

The presence of ciprofloxacin (CIP) in natural water may cause potential threats to the environment. Adsorption is a convenient and efficient method to remove CIP from aqueous solution. Bayberry tannin (BT), a natural polyphenol, has been utilized in the synthesis of tannin foam (TF) due to its abundant polyphenolic hydroxyls to chelate with metal ions. Read More

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Exposition of respiratory ailments from trace metals concentrations in incenses.

Sci Rep 2021 May 21;11(1):10210. Epub 2021 May 21.

Department of Chemistry, Kuwait University, Khaldiya Campus, BLDG 48, RM 7, PB 5969, 13060, Safat, Kuwait.

Selected trace metals of importance in different incense before and after the smoldering process were assessed based on the recent respiratory ailments. Marketed perfumed and non-perfumed incense from different countries was separately analyzed using an Inductive coupled Plasma-Mass Spectroscopy (ICP-MS). A particulate analyzer measured the dispersed particulates (PM) in the indoor environment. Read More

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Sulfur-anchored palm shell waste-based activated carbon for ultrahigh sorption of Hg(II) for in-situ groundwater treatment.

J Hazard Mater 2021 May 7;417:125995. Epub 2021 May 7.

Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea. Electronic address:

This study utilized a facile and scalable one-pot wet impregnation method for Hg(II) adsorption to prepare sulfur-anchored palm shell waste activated carbon powder (PSAC-S). The experimental results revealed that the sulfur precursors promote the surface charge on the PSAC and enhance Hg(II) removal via the NaS > NaSO > CHCSNH sequence. PSAC-S prepared using NaS had significant Hg(II) sorption efficiencies, achieving a maximum sorption capacity of 136 mg g from the Freundlich model. Read More

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A comparison of pesticide residues in soils from two highly technified agricultural valleys in northwestern Mexico.

J Environ Sci Health B 2021 May 17:1-18. Epub 2021 May 17.

Laboratorio de Ecotoxicología, Centro de Investigación en Alimentación y Desarrollo, A.C. (Unidad Mazatlán), Mazatlán, Sinaloa, México.

A pesticide characterization is presented for two highly technified valleys in northwest Mexico: Culiacan Valley (CV) in Sinaloa and Yaqui Valley (YV) in Sonora. Approximately 250,000 kg of active ingredients are used every year, half of which are considered highly hazardous pesticides. Legacy pesticides are still present in the soils of these valleys. Read More

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A solid-phase microextraction fiber coating based on magnetic covalent organic framework for highly efficient extraction of triclosan and methyltriclosan in environmental water and human urine samples.

Ecotoxicol Environ Saf 2021 Aug 13;219:112319. Epub 2021 May 13.

Zhejiang Provincial Key Laboratory of Watershed Science and Health, Southern Zhejiang Water Research Institute, College of Public Health and Management, Wenzhou Medical University, Wenzhou 325035, China. Electronic address:

Herein, we synthesized a kind of magnetic covalent organic framework nanohybrids ([email protected]), and integrated it with polydimethyl siloxane and silicone rubber curing agent for solid phase microextraction (SPME) fiber coating. The fiber coating demonstrated a porous and uniform surface with the BET specific surface of 169.7 m g. Read More

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Cross-ecosystem fluxes of pesticides from prairie wetlands mediated by aquatic insect emergence: implications for terrestrial insectivores.

Environ Toxicol Chem 2021 May 12. Epub 2021 May 12.

Fort Collins, CO, 80526, USA.

Contaminants alter the quantity and quality of insect prey available to terrestrial insectivores. In agricultural regions, the quantity of aquatic insects emerging from freshwaters can be impacted by insecticides originating from surrounding croplands. We hypothesized that, in such regions, adult aquatic insects could also act as important vectors of pesticide transfer to terrestrial food webs. Read More

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Zinc stable isotope analysis reveals Zn dyshomeostasis in benign tumours, breast cancer, and adjacent histologically normal tissue.

Metallomics 2021 May;13(6)

Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK.

The disruption of Zn homeostasis has been linked with breast cancer development and progression. To enhance our understanding of changes in Zn homeostasis both inside and around the tumour microenvironment, Zn concentrations and isotopic compositions (δ66Zn) were determined in benign (BT) and malignant (MT) tumours, healthy tissue from reduction mammoplasty (HT), and histologically normal tissue adjacent to benign (NAT(BT)) and malignant tumours (NAT(MT)). Mean Zn concentrations in NAT(BT) are 5. Read More

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Biochar and urea co-application regulates nitrogen availability in soil.

Environ Monit Assess 2021 May 5;193(6):326. Epub 2021 May 5.

Department of Soil Science, Punjab Agricultural University, Ludhiana-141 004, Ludhiana, India.

Overuse of nitrogenous fertilizers especially urea has been considered a significant source of reactive N causing acute environmental impacts through leaching, volatilization, and NO gas emission from fertilized crop fields. However, some recent studies have proposed that such environmental losses of N can be ignored by adapting an alternative way of combining nitrogenous fertilizer with pyrolyzed biomass (biochar). Therefore, the effect of co-application of rice-residue biochar (RB) or poultry manure biochar (PB) along with urea on N dynamics was investigated by conducting a 60-day incubation experiment. Read More

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Uranium accumulation and toxicokinetics in the crustacean Daphnia magna provide perspective to toxicodynamic responses.

Aquat Toxicol 2021 Jun 20;235:105836. Epub 2021 Apr 20.

Centre for Environmental Radioactivity (CERAD), Norwegian University of Life Sciences (NMBU), P.O. Box 5003, N-1432 Ås, Norway; Norwegian University of Life Sciences (NMBU), Faculty of Environmental Sciences and Natural Resource Management (MINA), P.O. Box 5003, N-1432 Ås, Norway.

The importance of incorporating kinetic approaches in order to gain information on underlying physiological processes explaining species sensitivity to environmental stressors has been highlighted in recent years. Uranium is present in the aquatic environment worldwide due to naturally occurring and anthropogenic sources, posing a potential risk to freshwater taxa in contaminated areas. Although literature shows that organisms vary widely with respect to susceptibility to U, information on toxicokinetics that may explain the variation in toxicodynamic responses is scarce. Read More

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Determination of Cd, Pb, and Cu in the Atmospheric Aerosol of Central East Antarctica at Dome C (Concordia Station).

Molecules 2021 Apr 1;26(7). Epub 2021 Apr 1.

Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy.

Trace heavy metals Cd, Pb, and Cu were determined (by square wave anodic stripping voltammetry) in aerosol samples collected at Dome C (the Italo-French Station Concordia), a remote site of the Central East Antarctic plateau, for which no data are available until now. During the Austral Summer 2005-2006, three PM10 high-volume impactors were installed in two locations nearby of Concordia station: the first one very close and downwind of the station (about 50 m north), the other two (very close to each other) in a 'distant' site, upwind of the station and close to the astrophysics tent (not used in that expedition) at ~800 m south of Station Concordia. For each sample, the availability of the mass of the aerosol collected (obtained by differential weighing carried out on site), in addition to the volume of the filtered air, allowed us to express results both in terms of metal mass fractions in the aerosol and in the usual way of metal atmospheric concentrations. Read More

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Magnetic Core-Shell Molecularly Imprinted Nano-Conjugates for Extraction of Antazoline and Hydroxyantazoline from Human Plasma-Material Characterization, Theoretical Analysis and Pharmacokinetics.

Int J Mol Sci 2021 Apr 1;22(7). Epub 2021 Apr 1.

Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland.

The aim of this study was to develop magnetic molecularly imprinted nano-conjugate sorbent for effective dispersive solid phase extraction of antazoline (ANT) and its metabolite, hydroxyantazoline (ANT-OH) in analytical method employing liquid chromatography coupled with mass spectrometry method. The core-shell material was characterized in terms of adsorption properties, morphology and structure. The heterogeneous population of adsorption sites towards ANT-OH was characterized by two K and two B values: K (1) = 0. Read More

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The impact of plasma 25-hydroxyvitamin D on pulmonary function and exercise physiology in cystic fibrosis: A multicentre retrospective study.

J Hum Nutr Diet 2021 Apr 28. Epub 2021 Apr 28.

Wessex Cystic Fibrosis Unit, University Hospital Southampton Foundation NHS Trust, Southampton, UK.

Background: A 25-hydroxyvitamin D (25OHD) may exert immunomodulatory effects on respiratory health, which may translate to improvements in exercise physiology. Thus, we aimed to investigate whether plasma 25OHD is associated with lung function and aerobic fitness in people with cystic fibrosis (pwCF).

Methods: A multicentre retrospective review of pwCF (> 9 years old) attending the Royal Hospital for Sick Children (Edinburgh) or Wessex CF-Unit (Southampton) was performed between July 2017 and October 2019. Read More

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Chemical constituents of fresh-cut potato as affected by cultivar, age, storage, and cooking.

J Food Sci 2021 May 21;86(5):1656-1671. Epub 2021 Apr 21.

Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia.

Certain changes in phenolics and sugars can occur during the storage of potatoes, where particularly amounts of sugars represent the critical factor as they are involved in potentially harmful acrylamide (AA) formation during frying. This research investigates the impact of cultivars (Birgit and Lady Claire), tuber's age (1, 5, and 9 months), and storage duration (1, 5, and 8 days at 10 °C) on the content of phenolics and sugars in raw, boiled, and fried fresh-cut potato (FCP). The influence of these factors on the formation of AA in fried FCP was also assessed. Read More

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Combination of supramolecular solvent-based microextraction and ultrasound-assisted extraction for cadmium determination in flaxseed flour by thermospray flame furnace atomic absorption spectrometry.

Food Chem 2021 Mar 27;357:129695. Epub 2021 Mar 27.

Departamento de Química, Universidade Estadual de Londrina (UEL), Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR CEP 86051-990, Brazil; Instituto Nacional de Ciência e Tecnologia (INCT) de Bioanalítica, Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Departamento de Química Analítica, Cidade Universitária Zeferino Vaz s/n, Campinas, SP CEP 13083-970, Brazil. Electronic address:

This study describes the development of a new analytical method for cadmium determination in flaxseed flour based on ultrasound-assisted extraction combined with supramolecular preconcentration followed by thermospray flame furnace atomic absorption spectrometry. Cadmium from flaxseed flour was extracted by ultrasound-assisted radiation in acid medium (1.5 mol LHNO) followed by liquid-liquid microextraction of the acid extractwith dodecanoic acid/THF supramolecular solvent using diethyl dithiophosphate as a chelating agent. Read More

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Co-cultivation of Streptomyces and microalgal cells as an efficient system for biodiesel production and bioflocculation formation.

Bioresour Technol 2021 Jul 5;332:125118. Epub 2021 Apr 5.

Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi 627412, Tamil Nadu, India.

The phytohormone producing Streptomyces rosealbus MTTC 12,951 (S.R) and green microalga Chlorella vulgaris MSU-AGM 14 (C.V) were cultivated in co-culture system to evaluate exogenous hormonal activity. Read More

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On-line speciation analysis of arsenic compounds in commercial edible seaweed by HPLC-UV-thermo-oxidation-HG-AFS.

Food Chem 2021 Apr 5;357:129725. Epub 2021 Apr 5.

Instituto de Investigación e Ingeniería Ambiental-IIIA, UNSAM, CONICET, 3iA, Campus Miguelete, 25 de mayo y Francia, 1650-San Martín, Provincia de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Godoy Cruz 2290, C1425FQB Buenos Aires, Argentina. Electronic address:

Arsenic speciation analysis in dried seaweeds was carried out using an on-line HPLC-UV-thermo-oxidation-HG-AFS system. Species separated and quantified were: arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMA), dimethylarsinic acid (DMA) and different arsenosugars. Extraction efficiency ranged between 38 and 83%. Read More

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Interaction of zinc oxide nanoparticles with soil: Insights into the chemical and biological properties.

Environ Geochem Health 2021 Apr 17. Epub 2021 Apr 17.

Southern Federal University, Rostov-on-Don, Russia, 344090.

Widespread use of zinc oxide nanoparticles (ZnO-NPs) threatens soil, plants, terrestrial and aquatic animals. Thus, it is essential to explore the fate and behavior of NPs in soil and also its mechanism of interaction with soil microbial biodiversity to maintain soil health and quality to accomplish essential ecosystem services. With this background, the model experiment was conducted in the greenhouse to study the impact of ZnO-NPs on soil taking maize as a test crop. Read More

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Unravelling the process of petroleum hydrocarbon biodegradation in different filter materials of constructed wetlands by stable isotope fractionation and labelling studies.

Biodegradation 2021 06 16;32(3):343-359. Epub 2021 Apr 16.

Environmental Resources & Technologies, Energy Department, AIT - Austrian Institute of Technology GmbH, Konrad Lorenz-Strasse 24, 3430, Tulln, Austria.

Maintaining and supporting complete biodegradation during remediation of petroleum hydrocarbon contaminated groundwater in constructed wetlands is vital for the final destruction and removal of contaminants. We aimed to compare and gain insight into biodegradation and explore possible limitations in different filter materials (sand, sand amended with biochar, expanded clay). These filters were collected from constructed wetlands after two years of operation and batch experiments were conducted using two stable isotope techniques; (i) carbon isotope labelling of hexadecane and (ii) hydrogen isotope fractionation of decane. Read More

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Soil CO emission and soil attributes associated with the microbiota of a sugarcane area in southern Brazil.

Sci Rep 2021 Apr 15;11(1):8325. Epub 2021 Apr 15.

School of Agricultural and Veterinarian Sciences (FCAV), São Paulo State University (Unesp), Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal, São Paulo, 14884-900, Brazil.

The spatial structure of soil CO emission (FCO) and soil attributes are affected by different factors in a highly complex way. In this context, this study aimed to characterize the spatial variability patterns of FCO and soil physical, chemical, and microbiological attributes in a sugarcane field area after reform activities. The study was conducted in an Oxisol with the measurement of FCO, soil temperature (Ts), and soil moisture (Ms) in a regular 90 × 90-m grid with 100 sampling points. Read More

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A combined approach based on matrix solid-phase dispersion extraction assisted by titanium dioxide nanoparticles and liquid chromatography to determine polyphenols from grape residues.

J Chromatogr A 2021 May 31;1644:462128. Epub 2021 Mar 31.

Analytical Chemistry Department. Faculty of Chemistry. Universidad Complutense de Madrid. 28040-Madrid, Spain.

A simple and efficient low-cost matrix solid phase dispersion (MSPD) extraction assisted by TiO nanoparticles and diatomaceous earth has been developed for the extraction of phenolic compounds from grape and grape pomace wastes. Experimental conditions for MSPD extraction were optimized by a factorial design and a surface response methodology. The simultaneous identification and quantification of eight main natural polyphenols (caffeic, p-coumaric, dihydroxybenzoic and gallic acid, rutin, resveratrol, quercetin and catechin) was possible by combining MSPD and capillary liquid chromatography coupled to a diode array detection and a mass simple quadrupole analyzer (cLC-DAD-MS). Read More

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Thermal stability of arsenic complexes in soils.

J Hazard Mater 2021 Mar 25;416:125715. Epub 2021 Mar 25.

Czech Geological Survey, Geologicka 6, 152 00 Prague 5, Czech Republic.

The release of soil arsenic (As) in an unsaturated zone under oxidative conditions and at two temperatures simulating the seasonal effect (15 °C and 23 °C) was studied in four cultivated soils from the Elbe River catchment (Czech Republic, Central Europe). The soils with a low geogenic As background contained from 10 to 50 µg.g of As, mostly originating from atmospheric deposition in the past. Read More

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Vanadium and Cadmium in Shallow Marine Sediments: Spatial and Temporal Behavior in the Tamaulipas Continental Platform, Gulf of Mexico, Mexico.

Bull Environ Contam Toxicol 2021 Apr 8. Epub 2021 Apr 8.

Unidad de Química Sisal, Facultad de Química, Universidad Nacional Autónoma de México, Puerto de Abrigo Sisal, 97355, Sisal, YUC, Mexico.

This study analyzed 27 surface sediment samples from the Tamaulipas Continental shelf to determine the spatial-temporal distribution of V and Cd (spring-summer 2016; summer 2017). Average V concentrations (99 ± 18 mg g) were similar to that previously reported values for the area, while average Cd concentrations reflect uncontaminated sediments at surface level of the shelf. Inputs of V and Cd may be related to hydrocarbon and anthropogenic contributions from South and North of the Gulf of Mexico. Read More

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European ferns as rich sources of antioxidants in the human diet.

Food Chem 2021 Sep 20;356:129637. Epub 2021 Mar 20.

Czech Academy of Sciences, Institute of Experimental Botany, Rozvojova 263, CZ-16502 Prague, Czech Republic. Electronic address:

Wild edible plants have become an attractive variation of the human diet, especially in East Asia, North America, and Oceania. However, their potential in nutrition is only rarely considered in Europe. This study aims to reveal the nutritional and antioxidant potential of mature fern leaves from 13 families grown in Europe. Read More

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September 2021