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Kalnins G, Bertins M, Viksna A, Tars K. Functionalization of bacterial microcompartment shell interior with cysteine containing peptides enhances the iron and cobalt loading capacity. Biometals 2024; 37:267-274. [PMID: 37728832 DOI: 10.1007/s10534-023-00538-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 09/11/2023] [Indexed: 09/21/2023]
Abstract
Bacterial microcompartments (BMCs) are prokaryotic organelles involved in several biochemical processes in bacterial cells. These cellular substructures consist of an icosahedral shell and an encapsulated enzymatic core. The outer shells of BMCs have been proposed as an attractive platform for the creation of novel nanomaterials, nanocages, and nanoreactors. In this study, we present a method for functionalizing recombinant GRM2-type BMC shell lumens with short cysteine-containing sequences and demonstrate that the iron and cobalt loading capacity of such modified shells is markedly increased. These results also imply that a passive flow of cobalt and iron atoms across the BMC shell could be possible.
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Affiliation(s)
- Gints Kalnins
- Latvian Biomedical Research and Study Centre, Ratsupites street 1, Riga, 1067, Latvia.
| | - Maris Bertins
- University of Latvia, Jelgavas street 1, Riga, 1004, Latvia
| | - Arturs Viksna
- University of Latvia, Jelgavas street 1, Riga, 1004, Latvia
| | - Kaspars Tars
- Latvian Biomedical Research and Study Centre, Ratsupites street 1, Riga, 1067, Latvia
- University of Latvia, Jelgavas street 1, Riga, 1004, Latvia
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2
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Labsvards KD, Rudovica V, Borisova A, Kokina K, Bertins M, Naumenko J, Viksna A. Multi-Element Profile Characterization of Monofloral and Polyfloral Honey from Latvia. Foods 2023; 12:4091. [PMID: 38002149 PMCID: PMC10670016 DOI: 10.3390/foods12224091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/01/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023] Open
Abstract
Honey is of scientific interest mainly due to its health-promoting and antibacterial properties, which are also associated with its floral origins. However, the methods for confirming honey floral origins are quite limited and require improvements. One method suggested in the search for a multi-method approach to evaluating the floral origins of Latvian honey is inductively coupled plasma mass spectrometry (ICP-MS). This study investigated the multi-element profile of 83 honey samples of well-specified floral origins. The main findings included using Ba, Ca, Cs, Fe, and Rb as indicator elements for heather honey. The chemometric evaluation supported the use of ICP-MS for distinguishing heather honey from other types of honey. The Latvian polyfloral honey multi-element profile was defined and compared to honey samples with other geographical origins. Additionally, the multi-element profiles of buckwheat, clover, and polyfloral honey proteins were investigated to clarify whether the majority of elements were bound with proteins or not. Preliminary results indicated that Ca, K, Mg, Mn, Na, and Sr were mainly found in non-protein-bound forms, while the majority of Al, Cu, Ni, and Zn were in the form of large chemical structures (>10 kDa).
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Affiliation(s)
- Kriss Davids Labsvards
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (M.B.); (J.N.); (A.V.)
- Institute of Food Safety, Animal Health and Environment “BIOR”, Lejupes Street 3, LV-1076 Riga, Latvia; (A.B.); (K.K.)
| | - Vita Rudovica
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (M.B.); (J.N.); (A.V.)
| | - Anastasija Borisova
- Institute of Food Safety, Animal Health and Environment “BIOR”, Lejupes Street 3, LV-1076 Riga, Latvia; (A.B.); (K.K.)
| | - Kristina Kokina
- Institute of Food Safety, Animal Health and Environment “BIOR”, Lejupes Street 3, LV-1076 Riga, Latvia; (A.B.); (K.K.)
| | - Maris Bertins
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (M.B.); (J.N.); (A.V.)
| | - Jevgenija Naumenko
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (M.B.); (J.N.); (A.V.)
| | - Arturs Viksna
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (M.B.); (J.N.); (A.V.)
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Araja A, Bertins M, Celma G, Busa L, Viksna A. Distribution of Minor and Major Metallic Elements in Residential Indoor Dust: A Case Study in Latvia. Int J Environ Res Public Health 2023; 20:6207. [PMID: 37444055 PMCID: PMC10341758 DOI: 10.3390/ijerph20136207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 06/14/2023] [Accepted: 06/19/2023] [Indexed: 07/15/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has not only brought considerable and permanent changes to economies and healthcare systems, but it has also greatly changed the habits of almost the entire society. During the lockdowns, people were forced to stay in their dwellings, which served as a catalyst for the initiation of a survey on the estimation of the metallic element content in residential indoor dust in different parts of Latvia. This article presents the study results obtained through the analysis of collected dust samples from 46 dwellings, both in the capital of Latvia, Riga, and in smaller cities. Two methods were employed for indoor dust collection: vacuum sampling and manual sampling with a brush and plastic spatula. After microwave-assisted acid extraction, the samples were analyzed using inductively coupled plasma mass spectrometry (ICP-MS) in terms of the major (Na, K, Ca, Mg, Al and Fe) and minor (Mn, Ni, Co, Pb, Cr, As, Ba, Li, Be, B, V, Cu, Zn, Se, Rb, Sr, Cd, La, Ce and Bi) elements. For the data analysis, principal component analysis was performed. Among the measured metals, the highest values were determined for the macro and most abundant elements (Na > K > Ca > Fe > Mg > Al). The concentration ranges of the persistently detected elements were as follows: Pb, 0.27-1200 mg kg-1; Cd, 0.01-6.37 mg kg-1; Ni, 0.07-513 mg kg-1; As, 0.01-69.2 mg kg-1; Cu, 5.71-1900 mg kg-1; Zn, 53.6-21,100 mg kg-1; and Cr, 4.93-412 mg kg-1. The critical limit values of metallic elements in soil defined by the legislation of the Republic of Latvia (indicating the level at or above which the functional characteristics of soil are disrupted, or pollution poses a direct threat to human health or the environment) were exceeded in the following numbers of dwellings: Pb = 4, Ni = 2, As = 1, Cu = 16, Cr = 1 and Zn = 28.
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Affiliation(s)
- Agnese Araja
- Faculty of Chemistry, University of Latvia, Jelgavas Str.1, LV-1004 Riga, Latvia
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Skadiņš I, Labsvārds KD, Grava A, Amirian J, Tomsone LE, Ruško J, Viksna A, Bandere D, Brangule A. Antimicrobial and Antibiofilm Properties of Latvian Honey against Causative Agents of Wound Infections. Antibiotics (Basel) 2023; 12:antibiotics12050816. [PMID: 37237718 DOI: 10.3390/antibiotics12050816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 04/22/2023] [Accepted: 04/24/2023] [Indexed: 05/28/2023] Open
Abstract
Honey is widely used in traditional medicine and modern wound healing biomaterial research as a broad-spectrum antimicrobial, anti-inflammatory and antioxidant agent. The study's objectives were to evaluate the antibacterial activity and polyphenolic profiles of 40 monofloral honey samples collected from beekeepers in the territory of Latvia. The antimicrobial and antifungal activity of Latvian honey samples were compared with commercial Manuka honey and the honey analogue sugar solutions-carbohydrate mixture and tested against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, clinical isolates Extended-Spectrum Beta-Lactamases produced Escherichia coli, Methicillin-resistant Staphylococcus aureus and Candida albicans. Antimicrobial activity was evaluated with the well-diffusion method (80% honey solution w/v) and microdilution method. The honey samples with the highest antimicrobial potential were tested to prevent biofilm development and activity against a preformed biofilm. The principal component analysis of the antimicrobial properties of honey samples vs. polyphenolic profile was performed. Eleven honey samples exhibited antibacterial activity to all investigated bacteria. The antibacterial effect of the samples was most significant on the Gram-positive bacteria compared to the studied Gram-negative bacteria. Latvian honey presents promising potential for use in wound healing biomaterials, opening the possibility of achieving long-term antibacterial effects.
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Affiliation(s)
- Ingus Skadiņš
- Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1658 Riga, Latvia
- Department of Biology and Microbiology, Riga Stradiņš University, LV-1007 Riga, Latvia
| | - Krišs Dāvids Labsvārds
- Faculty of Chemistry, University of Latvia, LV-1004 Riga, Latvia
- Institute of Food Safety, Animal Health and Environment "BIOR", LV-1076 Riga, Latvia
| | - Andra Grava
- Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Faculty of Materials Science and Applied Chemistry, Institute of General Chemical Engineering, Riga Technical University, LV-1007 Riga, Latvia
| | - Jhaleh Amirian
- Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1658 Riga, Latvia
- Department of Pharmaceutical Chemistry, Riga Stradiņš University, LV-1007 Riga, Latvia
| | - Laura Elīna Tomsone
- Institute of Food Safety, Animal Health and Environment "BIOR", LV-1076 Riga, Latvia
| | - Jānis Ruško
- Institute of Food Safety, Animal Health and Environment "BIOR", LV-1076 Riga, Latvia
| | - Arturs Viksna
- Faculty of Chemistry, University of Latvia, LV-1004 Riga, Latvia
| | - Dace Bandere
- Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1658 Riga, Latvia
- Department of Pharmaceutical Chemistry, Riga Stradiņš University, LV-1007 Riga, Latvia
| | - Agnese Brangule
- Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1658 Riga, Latvia
- Department of Pharmaceutical Chemistry, Riga Stradiņš University, LV-1007 Riga, Latvia
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Klavins L, Perkons I, Mezulis M, Viksna A, Klavins M. Procyanidins from Cranberry Press Residues-Extraction Optimization, Purification and Characterization. Plants (Basel) 2022; 11:3517. [PMID: 36559628 PMCID: PMC9786595 DOI: 10.3390/plants11243517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/08/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Procyanidins are a polyphenolic group that can be found in a variety of foods such as chocolate, tea, cranberries and others. Type A procyanidins can be found in a handful of sources and one of the richest sources are American cranberries. These compounds possess antioxidative, anticancer and anti-inflammatory activities and are most widely used as prevention for urinary tract infections. Cranberries are utilized for jam and juice production, and the latter produces industrial food waste press residues. Press residues contain free and bound procyanidins which can be extracted for use as nutraceuticals. In this study, the extraction of cranberry press residues has been optimized using RSM and the resulting extracts have been purified and fractionated. The obtained procyanidin fractions have been investigated for their antioxidative potential and analyzed using LC-ESI-FTICR-HRMS to determine individual procyanidins. The optimization showed that the optimal extraction can be conducted using acetone in a concentration of 53% without the addition of an acidifying agent. Strong correlation was observed for procyanidin contents and their antioxidative activity using DPPH, ABTS and FRAP methods. The purified fractions contained 78 individual (65 Type A) procyanidins with the degree of polymerization of up to 9.
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Affiliation(s)
- Linards Klavins
- Department of Environmental Science, University of Latvia, LV-1004 Riga, Latvia
| | - Ingus Perkons
- Institute of Food Safety, Animal Health and Environment “BIOR”, LV-1076 Riga, Latvia
| | - Marcis Mezulis
- Department of Environmental Science, University of Latvia, LV-1004 Riga, Latvia
| | - Arturs Viksna
- Faculty of Chemistry, University of Latvia, LV-1004 Riga, Latvia
| | - Maris Klavins
- Department of Environmental Science, University of Latvia, LV-1004 Riga, Latvia
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Bartkiene E, Starkute V, Zokaityte E, Klupsaite D, Bartkevics V, Zokaityte G, Cernauskas D, Ruzauskas M, Ruibys R, Viksna A. Combined Thermomechanical-Biological Treatment for Corn By-Product Valorization into Added-Value Food (Feed) Material. Plants (Basel) 2022; 11:3080. [PMID: 36432808 PMCID: PMC9696026 DOI: 10.3390/plants11223080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/05/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
The aim of this study was to apply the combined thermomechanical-biological treatment for corn processing by-product (CPBP) valorization to added-value food and feed material. The mechanical-thermal pre-treatment was performed by applying the extrusion technique. Extruded CPBPs (14, 16, and 18% moisture) were further biodegraded with Lactiplantibacillus plantarum-LUHS122 (Lpl), Liquorilactobacillus uvarum-LUHS245 (Lu), Lacticaseibacillus casei-LUHS210 (Lc), and Lacticaseibacillus paracasei-LUHS244 (Lpa). Acidity parameters, microbial characteristics, sugars concentration, amino and fatty acids profile, biogenic amines (BA), and antibacterial and antifungal properties of CPBP were analyzed. Fermented CPBP had a reduced count of mould/yeast. A significantly lower (p ≤ 0.05) count of total enterobacteria was found in most of the extruded-fermented CPBP. Fermentation of extruded CPBP (moisture of 16 and 18%) increased valine and methionine content. Cadaverine and spermidine were not found after treatment of CPBP, and the lowest content of BA was found in the extruded-fermented (Lpa, moisture 18%) CPBP. Applied treatment had a significant effect on most of the fatty acids. CPBP fermented with Lpl, Lu, and Lpa displayed inhibition properties against 3 of the 10 tested pathogenic/opportunistic bacterial strains. Extruded-fermented (Lu, Lc, and Lpa moisture of 14 and 18%) CPBP showed antifungal activity against Rhizopus. Extruded-fermented (14% moisture, Lpl) CPBP inhibited Rhizopus and Aspergillus fumigatus. In conclusion, combined treatment can improve certain parameters and properties of CPBP in order to produce safer and more nutritious ingredients for food and feed industries.
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Affiliation(s)
- Elena Bartkiene
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
- Department of Food Safety and Quality, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
| | - Vytaute Starkute
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
- Department of Food Safety and Quality, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
| | - Egle Zokaityte
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
| | - Dovile Klupsaite
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
| | - Vadims Bartkevics
- Institute of Food Safety, Animal Health and Environment BIOR, Lejupes iela 3, LV-1076 Riga, Latvia
| | - Gintare Zokaityte
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
| | - Darius Cernauskas
- Institute of Animal Rearing Technologies, Lithuanian University of Health Sciences, Tilzes Street 18, LT-47181 Kaunas, Lithuania
- Food Institute, Kaunas University of Technology, Radvilenu Road 19, LT-50254 Kaunas, Lithuania
| | - Modestas Ruzauskas
- Faculty of Veterinary, Institute of Microbiology and Virology, Lithuanian University of Health Sciences, Tilzes Street 58, LT-47181 Kaunas, Lithuania
| | - Romas Ruibys
- Institute of Agricultural and Food Sciences, Agriculture Academy, Vytautas Magnus University, K. Donelaicio Street 58, LT-44244 Kaunas, Lithuania
| | - Arturs Viksna
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia
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Eismonts U, Bertins M, Jefimova KA, Reinholds I, Saleniece K, Viksna A, Kizane G, Grinbergs A. Synthesis and development of an antidote for highly toxic and radioactive compounds. Res Social Adm Pharm 2022. [DOI: 10.1016/j.sapharm.2022.03.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Labsvards KD, Rudovica V, Kluga R, Rusko J, Busa L, Bertins M, Eglite I, Naumenko J, Salajeva M, Viksna A. Determination of Floral Origin Markers of Latvian Honey by Using IRMS, UHPLC-HRMS, and 1H-NMR. Foods 2021; 11:foods11010042. [PMID: 35010167 PMCID: PMC8750591 DOI: 10.3390/foods11010042] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/20/2021] [Accepted: 12/22/2021] [Indexed: 12/26/2022] Open
Abstract
The economic significance of honey production is crucial; therefore, modern and efficient methods of authentication are needed. During the last decade, various data processing methods and a combination of several instrumental methods have been increasingly used in food analysis. In this study, the chemical composition of monofloral buckwheat (Fagopyrum esculentum), clover (Trifolium repens), heather (Calluna vulgaris), linden (Tilia cordata), rapeseed (Brassica napus), willow (Salix cinerea), and polyfloral honey samples of Latvian origin were investigated using several instrumental analysis methods. The data from light stable isotope ratio mass spectrometry (IRMS), ultra-high performance liquid chromatography coupled with high-resolution mass spectrometry (UHPLC-HRMS), and nuclear magnetic resonance (NMR) analysis methods were used in combination with multivariate analysis to characterize honey samples originating from Latvia. Results were processed using the principal component analysis (PCA) to study the potential possibilities of evaluating the differences between honey of different floral origins. The results indicate the possibility of strong differentiation of heather and buckwheat honeys, and minor differentiation of linden honey from polyfloral honey types. The main indicators include depleted δ15N values for heather honey protein, elevated concentration levels of rutin for buckwheat honey, and qualitative presence of specific biomarkers within NMR for linden honey.
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Affiliation(s)
- Kriss Davids Labsvards
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
- Institute of Food Safety, Animal Health and Environment “BIOR”, Lejupes Street 3, LV-1076 Riga, Latvia
- Correspondence: ; Tel.: +371-26395784
| | - Vita Rudovica
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Rihards Kluga
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Janis Rusko
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
- Institute of Food Safety, Animal Health and Environment “BIOR”, Lejupes Street 3, LV-1076 Riga, Latvia
| | - Lauma Busa
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Maris Bertins
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Ineta Eglite
- Latvian Beekeeping Association, Rigas Street 22, LV-3004 Jelgava, Latvia;
| | - Jevgenija Naumenko
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Marina Salajeva
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
| | - Arturs Viksna
- Department of Chemistry, University of Latvia, Jelgavas Street 1, LV-1004 Riga, Latvia; (V.R.); (R.K.); (J.R.); (L.B.); (M.B.); (J.N.); (M.S.); (A.V.)
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Grinfelde I, Pilecka-Ulcugaceva J, Bertins M, Viksna A, Rudovica V, Liepa S, Burlakovs J. Dataset of trace elements concentrations in snow samples collected in Jelgava City (Latvia) in December 2020. Data Brief 2021; 38:107300. [PMID: 34522728 PMCID: PMC8427266 DOI: 10.1016/j.dib.2021.107300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 08/13/2021] [Accepted: 08/13/2021] [Indexed: 11/03/2022] Open
Abstract
The data set provided in this article consist of two repeated data sets of chemical elements concentrations in snow samples. The snow samples were collected in Jelgava city at December 15th with 5 day exposition time. Snow samples were collected in 59 monitoring points in Jelgava city and in one sample in rural area monitoring point as control. The collected snow samples were melted, acidified with HNO3 and analysed with ICP-MS. The samples were analysed Aluminium (Al), Silicon (Si), Chrome (Cr), Manganese (Mn), Iron (Fe), Nickel (Ni), Copper (Cu), Zinc (Zn), Arsenic (As), Molybdenum (Mo), Cadmium (Cd), Barium (Ba), Tungsten (W), Lead (Pb). The collected data are with fundamental scientific value and can be applied only for local data analysis. Data set is useful for local city air quality research work and for evaluation not only local urban impact but in future evaluate city green infrastructure impact on air quality and evaluation of air pollution mitigation measures efficiency.
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Affiliation(s)
- Inga Grinfelde
- Latvia University of Life Sciences and Technologies, Latvia
| | | | | | | | | | - Sindija Liepa
- Latvia University of Life Sciences and Technologies, Latvia
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Godina D, Meile K, Zhurinsh A, Viksna A. Method development of levoglucosenone analysis by UHPLC-UV-MS in fast pyrolysis samples and aspects of its degradation in aqueous samples. Anal Methods 2020; 12:5202-5209. [PMID: 33078773 DOI: 10.1039/d0ay01478h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Levoglucosenone ((1S,5R)-6,8-dioxabicyclo[3.2.1]oct-2-en-4-one or LGO; CAS number: 37112-31-5) is an extensively studied biomass based chemical and its potential applications in organic synthesis, as well as in the extraction of various natural substances, have been established; therefore developing dependable, yet fast and simple analytical methods for determining LGO in the products of thermochemical biomass processing is of great importance. In this work different UHPLC methods have been developed and compared for the determination of LGO in wood pyrolysis products. In addition to UV detection, LGO determination conditions by single quadrupole mass spectrometry have been adjusted with and without chemical derivatization. The ionization of LGO in the positive and negative electrospray ionisation mode and the effect of a mobile phase additive on LGO and its degradation product ionisation have been evaluated. Using the UHPLC-UV system, a method for the quantification of levoglucosenone was developed and the analytical parameters of the method were determined. Utilising the developed UHPLC-UV method, studies of LGO stability in standard solution and in fast pyrolysis products were carried out in various solvent systems at different temperatures and pH levels. The main LGO primary degradation product has been confirmed to be furfural. It has been concluded that the degradation rate of LGO is significantly affected by the solvent and storage temperature, so it is essential that LGO standard solutions and samples are analysed when freshly prepared. Using a UHPLC-MS system and derivatization with 2,4-dinitrophenylhydrazine (DNPH), a method for the determination of LGO was developed and the method analytical parameters were tested. To sum up, quantitative determination of LGO in pyrolysis products can be performed by reversed phase UHPLC-UV without any particular sample preparation, but in the case of UHPLC-MS it is necessary to derivatize LGO with DNPH to ensure ionisation of LGO. The additional work, requiring MS detection, can be outweighed by the greater selectivity compared to that of the more straightforward UV detection method in cases of incomplete chromatographic separation.
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Affiliation(s)
- D Godina
- Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006, Riga, Latvia.
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Shtangeeva I, Viksna A, Grebnevs V. Geochemical (soil) and phylogenetic (plant taxa) factors affecting accumulation of macro- and trace elements in three natural plant species. Environ Geochem Health 2020; 42:209-219. [PMID: 31152287 DOI: 10.1007/s10653-019-00337-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 05/21/2019] [Indexed: 06/09/2023]
Abstract
A field study was carried out to estimate the variations in the concentrations of macro- and trace elements in the rhizosphere soil and in roots and leaves of three widely distributed plant species-couch grass, plantain, and yarrow collected simultaneously from two sites characterized by different soil parameters. Main attention was paid to environmental (soil characteristics) and phylogenetic (plant species) factors that can influence on the concentrations of different elements in the plants and in soils. Both the factors cannot be considered as independent, although their contribution to the plant elemental composition may be different. There were statistically significant differences between concentrations of C, N, and H and 13 macro- and trace elements in the soils collected from the two sites. The concentrations of many chemical elements in the rhizosphere soil of the three plant species collected from the same site were often different. The differences in the characteristics of the soils at the sites resulted in differences between the concentrations of several elements in the plants growing at the sites. However, this was only one of the reasons of significant difference between the concentrations of macro- and trace elements in the same plant species collected from the sites. Couch grass, plantain, and yarrow had different reactions on the soil characteristics. The elemental composition of each plant species was unique although they grew at the same place and were collected simultaneously. Among the plants, yarrow was more tolerant to varying environmental conditions than plantain and couch grass.
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Affiliation(s)
- Irina Shtangeeva
- Institute of Earth Sciences, St. Petersburg University, Universitetskaya nab., 7/9, St. Petersburg, Russia, 199034.
| | - Arturs Viksna
- Faculty of Chemistry, University of Latvia, Jelgavas iela 1, Riga, Latvia
| | - Vladlens Grebnevs
- Faculty of Chemistry, University of Latvia, Jelgavas iela 1, Riga, Latvia
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Viter R, Kunene K, Genys P, Jevdokimovs D, Erts D, Sutka A, Bisetty K, Viksna A, Ramanaviciene A, Ramanavicius A. Photoelectrochemical Bisphenol S Sensor Based on ZnO‐Nanoroads Modified by Molecularly Imprinted Polypyrrole. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900232] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roman Viter
- Institute of Chemical Physics, and Institute of Atomic Physics and SpectroscopyUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
- NanoTechnas – Center of Nanotechnology and Materials ScienceFaculty of Chemistry and GeosciencesVilnius University Naugarduko 24 LT‐03225 Vilnius Lithuania
| | - Kwanele Kunene
- Department of ChemistryDurban University of Technology P.O Box 1334 Durban 4000 South Africa
- Faculty of ChemistryUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
| | - Povilas Genys
- Research Laboratory of Functional Materials TechnologiesFaculty of Materials Science and Applied ChemistryRiga Technical University P. Valdena 3/7 1048 Riga Latvia
| | - Daniels Jevdokimovs
- Institute of Chemical Physics, and Institute of Atomic Physics and SpectroscopyUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
| | - Donats Erts
- Institute of Chemical Physics, and Institute of Atomic Physics and SpectroscopyUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
- Sumy State UniversityCenter for Collective Use of Scientific Equipment 31, Sanatornaya st. 40018 Sumy Ukraine
| | - Andris Sutka
- Institute of Chemical Physics, and Institute of Atomic Physics and SpectroscopyUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
- Research Laboratory of Functional Materials TechnologiesFaculty of Materials Science and Applied ChemistryRiga Technical University P. Valdena 3/7 1048 Riga Latvia
| | - Krishna Bisetty
- Department of ChemistryDurban University of Technology P.O Box 1334 Durban 4000 South Africa
| | - Arturs Viksna
- Faculty of ChemistryUniversity of Latvia 19 Raina Boulevard LV 1586 Riga Latvia
| | - Almira Ramanaviciene
- Research Laboratory of Functional Materials TechnologiesFaculty of Materials Science and Applied ChemistryRiga Technical University P. Valdena 3/7 1048 Riga Latvia
| | - Arunas Ramanavicius
- Research Laboratory of Functional Materials TechnologiesFaculty of Materials Science and Applied ChemistryRiga Technical University P. Valdena 3/7 1048 Riga Latvia
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13
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Brangulis K, Akopjana I, Petrovskis I, Kazaks A, Jekabsons A, Jaudzems K, Viksna A, Bertins M, Tars K. Structural analysis of Borrelia burgdorferi periplasmic lipoprotein BB0365 involved in Lyme disease infection. FEBS Lett 2019; 594:317-326. [PMID: 31486526 DOI: 10.1002/1873-3468.13594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/15/2019] [Accepted: 08/28/2019] [Indexed: 11/07/2022]
Abstract
The periplasmic lipoprotein BB0365 of the Lyme disease agent Borrelia burgdorferi is expressed throughout mammalian infection and is essential for all phases of Lyme disease infection; its function, however, remains unknown. In the current study, our structural analysis of BB0365 revealed the same structural fold as that found in the NqrC and RnfG subunits of the NADH:quinone and ferredoxin:NAD+ sodium-translocating oxidoreductase complexes, which points to a potential role for BB0365 as a component of the sodium pump. Additionally, BB0365 coordinated Zn2+ by the His51, His55, His140 residues, and the Zn2+ -binding site indicates that BB0365 could act as a potential metalloenzyme; therefore, this structure narrows down the potential functions of BB0365, an essential protein for B. burgdorferi to cause Lyme disease.
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Affiliation(s)
| | - Inara Akopjana
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | | | - Andris Kazaks
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | | | - Kristaps Jaudzems
- Latvian Institute of Organic Synthesis, Riga, Latvia.,Faculty of Chemistry, University of Latvia, Riga, Latvia
| | - Arturs Viksna
- Faculty of Chemistry, University of Latvia, Riga, Latvia
| | - Maris Bertins
- Faculty of Chemistry, University of Latvia, Riga, Latvia
| | - Kaspars Tars
- Latvian Biomedical Research and Study Centre, Riga, Latvia.,Faculty of Biology, University of Latvia, Riga, Latvia
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14
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Rjabova J, Viksna A, Zacs D. Development and optimization of gas chromatography coupled to high resolution mass spectrometry based method for the sensitive determination of Dechlorane plus and related norbornene-based flame retardants in food of animal origin. Chemosphere 2018; 191:597-606. [PMID: 29078185 DOI: 10.1016/j.chemosphere.2017.10.095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 10/05/2017] [Accepted: 10/16/2017] [Indexed: 06/07/2023]
Abstract
An analytical method has been developed for the trace determination of 10 dechlorane-related compounds (DRCs) in food products by gas chromatography - high resolution mass spectrometry (GC-HRMS). The highest sensitivity of this instrumental analysis method was achieved by selection of the GC column type, optimization of the heated zones within the instrument, and adjusting the electron impact energy. The efficiency of solid phase extraction as clean-up procedure was also optimized. Two different types of cartridges - neutral silica gel and Florisil®, as well as seven organic solvents or their mixtures - n-hexane, cyclohexane, acetone, toluene, n-hexane/ethyl acetate, n-hexane/acetone, and n-hexane/dichloromethane - were evaluated. The analytical method was characterized as selective, precise, accurate, and linear over the concentration ranges from 1.00 to 100 pg μL-1 for DRCs. Ultra-trace level sensitivity was achieved with the instrumental limits of quantification (i-LOQs) varying from ∼0.01 pg to ∼ 1 pg and method limits of quantification (m-LOQs) by the analysis of 10 g of sample varying from ∼0.04 to ∼ 5 pg g-1. The developed method was successfully applied for the analysis of food samples and the analyses revealed the presence of majority of selected DRCs, with the Dechlorane Plus (DP) isomers occurring to a greater extent, pointing to the highest levels in cod liver and other fish products.
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Affiliation(s)
- Jekaterina Rjabova
- Institute of Food Safety, Animal Health and Environment ''BIOR'', Lejupes Street 3, Riga, LV-1076, Latvia; University of Latvia, Jelgavas Street 1, Riga, LV-1004, Latvia.
| | - Arturs Viksna
- University of Latvia, Jelgavas Street 1, Riga, LV-1004, Latvia
| | - Dzintars Zacs
- Institute of Food Safety, Animal Health and Environment ''BIOR'', Lejupes Street 3, Riga, LV-1076, Latvia
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15
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Meile K, Zhurinsh A, Viksna A. Comparison of photodiode array, evaporative light scattering, and single-quadrupole mass spectrometric detection methods for the UPLC analysis of pyrolysis liquids. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2017.1308378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Kristine Meile
- Department of Technological Research, Latvian State Institute of Wood Chemistry, Riga, Latvia
- Department of Analytical Chemistry, University of Latvia, Riga, Latvia
| | - Aivars Zhurinsh
- Department of Technological Research, Latvian State Institute of Wood Chemistry, Riga, Latvia
| | - Arturs Viksna
- Department of Analytical Chemistry, University of Latvia, Riga, Latvia
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Rozentale I, Ancans J, Bartkiene E, Viksna A, Bartkevics V. Efficacy of Ozonation Treatments of Smoked Fish for Reducing Its Benzo[a]pyrene Concentration and Toxicity. J Food Prot 2016; 79:2167-2173. [PMID: 28221959 DOI: 10.4315/0362-028x.jfp-16-133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ozone is widely used in food processing, for example, to decompose mycotoxins or pesticide residues, to extend the shelf life of products, and for sanitation. The objective of this study was to assess the possibility of expanding the application of ozone for oxidative degradation of polycyclic aromatic hydrocarbons (PAHs). The evaluation was conducted by ozonation of a benzo[a]pyrene (BaP) standard solution and smoked fish (sprats) contaminated with PAHs. The effect of ozonation was immediate in the BaP solution; 89% of this toxic compound was decomposed after only 1 min of treatment. However, the impact of ozonation on the smoked sprats was less pronounced, even after prolonged treatment. The final reduction in benzo[b]fluoranthene and BaP concentrations in smoked sprats contaminated with PAHs was 34 and 46%, respectively, after 60 min of ozonation, but no significant decrease of benzo[a]anthracene and chrysene concentrations was observed. To evaluate the safety of ozonation, the toxicity of the ozone-treated BaP standard solution was investigated. In vitro toxicity was evaluated using human hepatocellular carcinoma and mouse embryonic fibroblast cell lines as models. The cytotoxicity of the BaP standard solution significantly increased after ozonation, indicating a pronounced negative effect in terms of food safety.
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Affiliation(s)
- Irina Rozentale
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes iela 3, Riga LV-1076, Latvia.,University of Latvia, Jelgavas iela 1, Riga LV-1004, Latvia
| | - Janis Ancans
- University of Latvia, Jelgavas iela 1, Riga LV-1004, Latvia
| | - Elena Bartkiene
- Department of Food Safety, Lithuanian University of Health Sciences, Tilzes g. 18, Kaunas 47181, Lithuania
| | - Arturs Viksna
- University of Latvia, Jelgavas iela 1, Riga LV-1004, Latvia
| | - Vadims Bartkevics
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes iela 3, Riga LV-1076, Latvia.,University of Latvia, Jelgavas iela 1, Riga LV-1004, Latvia
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17
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Vorslova S, Golushko J, Galushko S, Viksna A. Efficiency of a solvatic sorption model for the prediction of retention times in linear gradient reversed-phase liquid chromatography working with different stationary phases. Proc Estonian Acad Sci 2016. [DOI: 10.3176/proc.2016.1.03] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Kunakova G, Katkevics J, Viksna A, Gertnere Z, Varghese J, Holmes JD, Erts D. Application of Electrochemical Impedance for Characterising Arrays of Bi2S3 Nanowires. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.04.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Zacs D, Rjabova J, Viksna A, Bartkevics V. Method development for the simultaneous determination of polybrominated, polychlorinated, mixed polybrominated/chlorinated dibenzo-p-dioxins and dibenzofurans, polychlorinated biphenyls and polybrominated diphenyl ethers in fish. Chemosphere 2015; 118:72-80. [PMID: 25014661 DOI: 10.1016/j.chemosphere.2014.06.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Revised: 05/20/2014] [Accepted: 06/15/2014] [Indexed: 06/03/2023]
Abstract
An analytical methodology was developed for simultaneous determination of five groups of persistent organic pollutants (POPs) including polybrominated, polychlorinated and mixed brominated-chlorinated dibenzo-p-dioxins and dibenzofurans (PBDD/DFs, PCDD/DFs and PXDD/DFs, respectively), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in fish samples. The presented analytical approach was based on well established and robust method for determination of PCDD/DFs and PCBs, which was augmented with gas chromatography coupled to high resolution mass spectrometry (GC-HRMS) to include PBDEs, as well as poorly investigated PBDD/DFs and PXDD/DFs at toxicologically significant levels. Intensive clean-up and fractionation procedures in combination with optimized instrumental parameters provided reliable detection and quantification of these compounds. The application of (13)C12-labeled surrogates of analyzed compounds allowed the internal standardization and accurate measurement of selected contaminants. The developed procedure was validated while taking into account the Commission Regulation (EU) 252/2012 requirements for PCDD/DFs and PCBs, and was used to measure the occurrence of priority POPs in Baltic wild salmon.
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Affiliation(s)
- D Zacs
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes iela 3, Riga LV-1076, Latvia; University of Latvia, Department of Chemistry, Kr. Valdemara iela 48, Riga LV-1013, Latvia.
| | - J Rjabova
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes iela 3, Riga LV-1076, Latvia
| | - A Viksna
- University of Latvia, Department of Chemistry, Kr. Valdemara iela 48, Riga LV-1013, Latvia
| | - V Bartkevics
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes iela 3, Riga LV-1076, Latvia; University of Latvia, Department of Chemistry, Kr. Valdemara iela 48, Riga LV-1013, Latvia
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Zacs D, Rjabova J, Pugajeva I, Nakurte I, Viksna A, Bartkevics V. Ultra high performance liquid chromatography–time-of-flight high resolution mass spectrometry in the analysis of hexabromocyclododecane diastereomers: Method development and comparative evaluation versus ultra high performance liquid chromatography coupled to Orbitrap high resolution mass spectrometry and triple quadrupole tandem mass spectrometry. J Chromatogr A 2014; 1366:73-83. [DOI: 10.1016/j.chroma.2014.09.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Revised: 09/07/2014] [Accepted: 09/08/2014] [Indexed: 11/27/2022]
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Poplausks R, Malinovskis U, Andzane J, Svirksts J, Viksna A, Muiznieks I, Erts D. Electrochemically etched sharp aluminium probes with nanoporous aluminium oxide coatings: demonstration of addressed DNA delivery. RSC Adv 2014. [DOI: 10.1039/c4ra08509d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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22
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Rudovica V, Viksna A, Actins A. Application of LA-ICP-MS as a rapid tool for analysis of elemental impurities in active pharmaceutical ingredients. J Pharm Biomed Anal 2014; 91:119-22. [DOI: 10.1016/j.jpba.2013.12.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 12/17/2013] [Accepted: 12/21/2013] [Indexed: 11/25/2022]
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Mackeviča J, Ostrovskis P, Leffler H, Nilsson UJ, Rudovica V, Viksna A, Belyakov S, Turks M. Synthesis of 1,2,3-triazole-linked galactohybrids and their inhibitory activities on galectins. ARKIVOC 2014. [DOI: 10.3998/ark.5550190.p008.402] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Ansone L, Klavins M, Viksna A. Arsenic removal using natural biomaterial-based sorbents. Environ Geochem Health 2013; 35:633-642. [PMID: 23793448 DOI: 10.1007/s10653-013-9546-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 03/05/2013] [Indexed: 06/02/2023]
Abstract
Arsenic contamination of water is a major problem worldwide. A possible solution can be approached through developing new sorbents based on cost-effective and environmentally friendly natural biomaterials. We have developed new sorbents based on biomaterial impregnation with iron oxyhydroxide. In this study, raw peat material, iron-modified peat, iron-modified biomass (shingles, straw, sands, cane and moss) as well as iron humate were used for the removal of arsenate from contaminated water. The highest sorption capacity was observed in iron-modified peat, and kinetic studies indicated that the amount of arsenic sorbed on this material exceeds 90 % in 5 h. Arsenate sorption on iron-modified peat is characterised by the pseudo-second-order mechanism. The results of arsenic sorption in the presence of competing substances indicated that sulphate, nitrate, chloride and tartrate anions have practically no influence on As(V) sorption onto Fe-modified peat, whereas the presence of phosphate ions and humic acid significantly lowers the arsenic removal efficiency.
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Affiliation(s)
- Linda Ansone
- Department of Environmental Science, University of Latvia, Raina Blvd 19, Riga, Latvia.
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Vincevica-Gaile Z, Klavins M, Rudovica V, Viksna A. Research review trends of food analysis in Latvia: major and trace element content. Environ Geochem Health 2013; 35:693-703. [PMID: 23821223 DOI: 10.1007/s10653-013-9549-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 05/02/2013] [Indexed: 06/02/2023]
Abstract
The current paper involves overview of several studies concerning quantitative major and trace element analysis of different food samples, such as products of plant origin, e.g., locally grown vegetables (carrots, onions, potatoes) and products of animal origin derived with or without processing (cottage cheese, eggs, honey). Food samples were collected over the territory of Latvia in the time period 2009-2012. Sample pre-treatment was chosen according to the product specifics but mostly wet mineralization with concentrated nitric acid was applied. Analysis of major elements (e.g., Ca, Fe, K, Mg, Na) and trace elements (e.g., As, Cd, Co, Cr, Cu, Ni, Pb, Se, Zn) was performed by appropriate quantitative analytical technique: atomic absorption spectrometry, inductively coupled plasma mass spectrometry or total reflection X-ray fluorescence spectrometry. Not only the influence of environmental factors (e.g., geographical or seasonal impact) was detected in element dissemination in food, also botanical origin (if applicable) and applied agricultural praxis, product processing and storage specifics were found to be important. Possible food contamination by potentially toxic elements can be associated mostly with the consequences of anthropogenic activities. The studies revealed the significance of food research in the context of environmental science.
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Affiliation(s)
- Zane Vincevica-Gaile
- Department of Environmental Science, University of Latvia, 10 Alberta Street, Riga, Latvia.
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Zacs D, Bartkevics V, Viksna A. Content of polychlorinated dibenzo-p-dioxins, dibenzofurans and dioxin-like polychlorinated biphenyls in fish from Latvian lakes. Chemosphere 2013; 91:179-86. [PMID: 23336927 DOI: 10.1016/j.chemosphere.2012.12.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 11/30/2012] [Accepted: 12/15/2012] [Indexed: 05/02/2023]
Abstract
Seventeen polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/PCDFs) of the highest priority as well as twelve dioxin-like polychlorinated biphenyls (dl-PCBs) were analyzed in the muscle tissues of the following freshwater fish species sampled from eleven Latvian freshwater lakes: perch (Perca flavescens), carp (Cyprinus carpio), eel (Anguilla rostrata), bream (Abramis brama), chub (Leuciscus cephalus), pike (Esox lucius), sheatfish (Silurus glanis) and roach (Rutilus). To analyze the selected persistent organic pollutants in fish matrices, an optimization of EPA-1613 and EPA-1668A clean-up procedures was carried out, followed by validation of the analytical procedure according to Commission Regulation (EC) No 1883/2006. The adopted analytical procedure was in compliance with requirements of the more recent Commission Regulation (EU) No 252/2012. Modifications of carbon column chromatography clean-up and separation steps were used for treatment of the fish samples. Other clean-up procedure stages were performed according to the methods EPA-1613 and EPA-1668A and involved gel permeation chromatography (GPC), as well as manual acidic silica and Florisil column chromatography for purification and fractionation of the samples. An isotope dilution method was used for the qualitative and quantitative determination of individual congeners. Analytes of interest were separated and detected using gas chromatography - high resolution mass spectrometry. The concentration of PCDD/PCDFs and dl-PCBs in freshwater fish and eel samples ranged from 0.05 to 8.0 pg WHO(1998)-PCDD/PCDF-PCB-TEQ g(-1) fresh weight. These levels are below the EU maximum permissible limits although calculation of the content of these compounds relative to the weight of fat shows contamination levels similar to those found in Baltic herring and sprats, that are known to be highly contaminated. A difference in congener pattern between the Baltic Sea fish and freshwater fish was detected with lower contribution of 2,3,4,7,8-PeCDF to the contamination of inland water fish.
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Affiliation(s)
- D Zacs
- Institute of Food Safety, Animal Health and Environment BIOR, Lejupes iela 3, Riga, LV-1076, Latvia.
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Hmelnickis J, Pugovičs O, Kažoka H, Viksna A, Susinskis I, Kokums K. Application of hydrophilic interaction chromatography for simultaneous separation of six impurities of mildronate substance. J Pharm Biomed Anal 2008; 48:649-56. [DOI: 10.1016/j.jpba.2008.06.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2008] [Revised: 06/09/2008] [Accepted: 06/17/2008] [Indexed: 11/24/2022]
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29
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Viksna A, Selin Lindgren E, Kjellmer I, Bursa J. ANALYSIS OF WHOLE BLOOD AND PLACENTA—A CASE STUDY OF MOTHERS AND THEIR BABIES. ACTA ACUST UNITED AC 2007. [DOI: 10.1081/tma-120015616] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Jørgensen N, Laursen J, Viksna A, Pind N, Holm PE. Multi-elemental EDXRF mapping of polluted soil from former horticultural land. Environ Int 2005; 31:43-52. [PMID: 15607778 DOI: 10.1016/j.envint.2004.06.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2004] [Accepted: 06/14/2004] [Indexed: 05/24/2023]
Abstract
The distribution of major and trace elements was systematically investigated by use of energy dispersive X-ray fluorescence spectrometry (EDXRF) on a former horticultural soil. The purpose of the study was to combine mapping of soil element concentration levels with multivariate statistics for characterisation of soil metal pollution in relation to previous and present land use. A 1-ha study site was chosen from a former horticulture where a previous preliminary survey indicated increased concentration levels of toxic elements. The soil was sampled from the top 20 cm of the soil surface in a 10 x 10-m grid-like pattern covering the 1-ha study area. In addition, three soil profiles were studied. The elemental composition of the soil samples was investigated by EDXRF while the composition of aqueous soil extracts was determined by total reflection X-ray fluorescence spectrometry (TXRF). Based on mapping and multivariate statistically analysis of the data obtained by EDXRF, most elements were found in almost constant concentration levels in the top soil throughout the investigated site. However, the contents of the toxic elements Zn, Cu, As, and Pb were found to vary significantly within the area. Hence, the samples with high accumulations of As also contained relatively high amounts of Zn, Cu, and Pb, which indicates that toxic-element-containing pesticides have been applied to the soil surface in the area of the former green houses at the study site. The Pb/As mass ratio in the soil indicates that PbHAsO3 was the preferential lead arsenate used for pest management at the investigated site, while Cu as Bordeaux liquid (CuSO4) and Zn were applied to minimize the leaf damaging effect from the former compounds. Calculations indicated that As annually was applied to the soil in the former greenhouses in doses up to 4 kg As/ha while Pb had been annually applied in doses up to 12 kg Pb/ha. The enrichment of Zn, Cu, As and Pb was greatest in the top 20 cm of the soil and no anthropogenic enrichment of these elements occurred below a depth of 50 cm, indicating that the toxic elements are rather immobile in this soil. The results of this investigation suggest that EDXRF used in combination with multivariate statistics is a strong tool for multi-element mapping of elemental contents, sources and mobility in the terrestrial environment.
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Affiliation(s)
- Nina Jørgensen
- Department of Natural Sciences, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40 DK-1871 Frederiksberg C Copenhagen, Denmark
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Rumba I, Ruperto N, Bikis E, Remberga S, Saulite I, Plotkina N, Viksna A, Krauca M, Breca I, Vikmanis U. The Latvian version of the Childhood Health Assessment Questionnaire (CHAQ) and the Child Health Questionnaire (CHQ). Clin Exp Rheumatol 2001; 19:S101-5. [PMID: 11510310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
We report herein the results of the cross-cultural adaptation and validation into the Latvian language of the parent's version of two health related quality of life instruments. The Childhood Health Assessment Questionnaire (CHAQ) is a disease specific health instrument that measures functional ability in daily living activities in children with juvenile idiopathic arthritis (JIA). The Child Health Questionnaire (CHQ) is a generic health instrument designed to capture the physical and psychosocial well-being of children independently from the underlying disease. The Latvian CHAQ CHQ were fully validated with 1 forward and 1 backward translations. A total of 141 subjects were enrolled: 80 patients with JIA (16% systemic onset, 32.5% polyarticular onset, 19% extended oligoarticular subtype, and 32.5% persistent oligoarticular subtype) and 61 healthy children. The CHAQ clinically discriminated between healthy subjects and JIA patients, with the systemic, polyarticular and extended oligoarticular subtypes having a higher degree of disability, pain, and a lower overall well-being when compared to their healthy peers. Also the CHQ clinically discriminated between healthy subjects and JIA patients, with the systemic onset, polyarticular onset and extended oligoarticular subtypes having a lower physical and psychosocial well-being when compared to their healthy peers. In conclusion the Latvian version of the CHAQ-CHQ is a reliable, and valid tool for the functional, physical and psychosocial assessment of children with JIA.
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Affiliation(s)
- I Rumba
- Faculty of Medicine, University of Lativa, Raina Bulv, 19, LV-1586 Riga, Latvia.
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Viksna A. [250th anniversary of the Riga Pharmacy]. Farmatsiia 1977; 26:81-2. [PMID: 330255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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