Analytical Chemistry

Contribution List

4. APPLICATION OF WASTEWATER – BASED EPIDEMIOLOGY FOR TRACKING HUMAN EXPOSURE TO DEOXYNIVALENOL AND ENNIATINS

Zane Berzina

Oral presentation

Wastewater - based epidemiology (WBE) is a promising biomonitoring approach with the potential to provide direct information on human intake and exposure to food and environmental chemicals. WBE based on the normalisation method using a population biomarker 5-hydroxyindoleacetic acid (5-HIAA) is the aim of this study. This type of normalization technique has been previously used to detect...

7. BIOACTIVITY ENHANCEMENT OF PEO COATINGS BY INTRODUCTION OF AMORPHOUS CALCIUM PHOSPHATE PARTICLES

Mr Vladlens Grebņevs (University of Latvia, Faculty of Chemistry)

Oral presentation

Bioactivity is one of the key indicators of implant coating quality of and their suitability in bone disease treatment. In vivo it lies in the ability of a certain material to form strong and stable bonds with living tissues. While for its evaluation in vitro, simulated body fluid tests are the most commonly used, based on immersion of a test sample in the environment with physiological...

8. CHARACTERISATION OF SUBERINIC ACIDS AND THEIR POTENTIAL APPLICATIONS

Oral presentation

Global sustainability challenges prompt the world to modify their strategies and shift from a fossil-fuel-based economy to a bio-resources-based one and to the production of renewable biomass chemicals. Different processes exist that allow the transformation of raw biomass into desirable bio-based products and/or energy. Depolymerized suberinic acids can be considered as an alternative...

2. DETERMINATION OF LATVIAN HONEY FLORAL ORIGINS USING IRMS, UHPLC-HRMS, ICP-MS, FT IR AND 1H-NMR

Oral presentation

Natural bee honey is a sweet product made by honeybees (Apis mellifera L.) and it has grown in scientific interest in the past decade. Modern and efficient methods of honey analysis are needed in order to assure products quality. One of many honey quality cornerstones is floral origins determination. Monofloral honey has to be gathered from one major floral source at a certain threshold...

6. DIETARY EXPOSURE ASSESSMENT TO PERFLUOROALKYL SUBSTANCES

Oral presentation

Per- and polyfluorinated alkyl substances (PFASs) comprise a large group of anthropogenic chemicals which are ubiquitous environmental contaminants. In 2020 European Food Safety Authority (EFSA) established a tolerable weekly intake (TWI) of 4.4 ng/kg bw per week for the sum of four PFASs: perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorohexanesulfonic acid (PFHxS) and...

10. DISCRIMINATION BETWEEN CONVENTIONALLY AND ORGANICALLY FERTILIZED GRAINS BY FTIR AND 1H NMR SPECTROSCOPY COMBINED WITH CHEMOMETRICS

Oral presentation

In the last decade, the world has seen growth in interest about the food traceability. This includes not only origins of the food, but also, it’s accordance to labelling [1]. In this study the authors researched the possibility of using FTIR and 1H NMR spectroscopy in combination with chemometric approach to distinguish between conventionally and organically fertilized cereal...

3. IMPACT OF AMINO ACID CONTAINING FERTILIZER ON ELEMENTAL AND ISOTOPIC CONTENT IN SPRUCE AND PINE STANDS

Maris Bertins (University of Latvia)

Oral presentation

More than half of the territory of Latvia is covered with forests - 3.4 million ha. And forest areas still continue to increase due to the afforestation of abandoned agricultural, former mining areas, and also by natural forest growth. As a measure to increase the competitiveness of planted seedlings with forest environment vegetation and addition of lacking nutrient elements to improve growth...

13. INVESTIAGTION OF NANOSTRUCTURED Bi2Se3 THIN FILMS AS ANODES FOR AQUEOUS RECHARGEABLE LITHIUM-ION BATTERIES

Vitālijs Lazarenko (Institute of Chemical Physics, University of Latvia)

Oral presentation

In the last decade, lithium-ion batteries (LIBs) have dominated the world as the most efficient electrical energy storage device. In comparison with lead-acid or carbon-zinc batteries LIBs have a supreme energy density (>200 Wh kg-1), cycle life (up to 3000 cycles), and energy efficiency (>95 %). Despite their huge advantages, however, the use of non-aqueous electrolytes (e.g., LiBF4, LiPF6)...

11. Isolation of four tocotrienol homologues and plastochromanol-8 from plant oils and the rapid ‘green’ analysis of nine tocochromanols in cold-pressed plant oils via superficially porous particle packed column technology and supercritical fluid chromatography.

Georgijs Baskirovs

Oral presentation

In the present study, four tocotrienol (T3) homologues and plastochromanol-8 (PC-8) were isolated from plant oils; Linum usitatissimum (PC-8), Bixa orellana (γ-T3 and δ-T3), and Triticum spelta bran (α-T3 and β-T3) by supercritical fluid chromatography (SFC). The optimized method of tocopherols, tocotrienols, and PC-8 separation via SFC with UV detection was validated on a biphenyl...

9. Qualitative fingerprinting of psychoactive pharmaceuticals, illicit drugs, and related human metabolites in wastewater during the COVID-19 pandemic in Riga, Latvia

Ingus Perkons (Institute of Food Safety, Animal Health and Environment "BIOR")

Oral presentation

Multiple studies have outlined that the COVID-19 pandemic and government interventions to curb the spread of the virus are likely to have an effect on mental health and substance use patterns [1]. In this study, we explored the presence of psychoactive pharmaceuticals, illicit drugs and related human metabolites in 24-h composite wastewater samples that were sampled weekly over the period of...

15. Recent trends in pesticide analysis by two-dimensional liquid chromatography - mass spectrometry

Aris Jansons

Oral presentation

Pesticide residues and their degradation products can persist on harvested food, as well as in the environment, therefore representing a risk to human and animal health and the environment. The challenges for the pesticide residue analysis are the huge number of possible residues, the chemical diversity of the pesticides, the variety of matrices, and the control of the statutory maximum...

14. SEPARATION OF BLACK ALDER BARK EXTRACTS USING SOLID PHASE EXTRACTION TO OBTAIN FRACTIONS WITH IMPROVED PROPERTIES

Matiss Pals (Latvian State Institute of Wood chemistry)

Oral presentation

Black alder bark (Alnus glutinosa) refers to the lignocellulosic biomass which together with the main cell wall components contains a wide range of polyphenolic extractives including diarylheptanoids which are recognized as a natural antioxidants [1]. Therefore, black alder bark extract is a resource with wide range of possible practical application including antioxidative additives in...

12. SYNTHESIS OF IRON HEXACYANOFERRATE IMOBILISED ON CELLULOSE ACETATE FOR CAESIUM SORPTION FROM AQUATIC ENVIRONMENTS

Ugis Eismonts

Oral presentation

The present study aims development of iron hexacyanoferrate (PB) cellulose acetate (CA) sorbent for the removal of radioactive caesium, rubidium, and thallium from contaminated water environments. The synthesis of PB-CA sorbent conducted by ultrasound assisted micro nozzle technique provided in situ immobilisation of sorbent particles on chemically cleaned of non-used cigarette butt fiber...

1. TEMPERATURE EFFECT ON THE YIELD OF METHANE FROM BOG SLUDGE AND REED RAW MATERIALS

Mr Aleksandrs Pučkins, Sergejs Osipovs

Oral presentation

Biogas is a gaseous energy resource that can be obtained by anaerobic fermentation using biomass. The main component of biogas is methane (CH4) and carbon dioxide (CO2), which also includes other gases with certain physical properties. Biogas is a renewable energy resource that does not pollute the environment and the air. Biogas production reduces landfill growth and reduces water and soil...

5. THE OPPORTUNITIES AND CHALLENGES OF CHEMICAL PROFILING OF HERBAL EXTRACTS USING CHROMATOGRAPHIC ANALYSIS

Ms Ance Bārzdiņa (Riga Stradiņš University, Department of Pharmaceutical Chemistry, Dzirciema 16, Riga, Latvia; Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, Kaļķu street 1, Latvia)

Oral presentation

Medicinal plants have a very complex composition with hundreds of chemical components[1]. With the ever-growing market of herbal medicines, the quality control and safety of these products have become an important issue. The currently used analytical methods provided by pharmacopeias can’t provide a comprehensive chemical description of herbal medicines, so recently a chemical profiling method...