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Search results for: GPC
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3-Monochloropropane-1,2-diol in Infant Foods and Human Breast Milk: Determination by GC-MS
Publication3-Monochloropropane-1,2-diol is one of the food borne contaminants called chloropropanols. Over the last decade plenty of analytical methods was developed in order to determine 3-monochloropropane-1,2-diol in its free and bound form in various foodstuffs with the use of GC-FID, GC-ECD, LC-TOFMS and finally GC-MS, which is now widely used in laboratories. The aim of this research was the determination of 3-monochloropropane--1,2-diol...
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Validated GC–MS method for determination of bisphenol a and its five analogues in dietary and nutritional supplements
PublicationBisphenol A (BPA) and its analogues showing structural and functional similarity to BPA are commonly applied in various industrial applications and thus are becoming ubiquitous in the environment. At the same time there is increasing scientific evidence that exposure to these chemicals may lead to adverse health effects in human and wildlife. In recent years dietary and nutritional supplements dedicated for athletes have become...
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Jerzy Demkowicz dr inż.
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Discrete-time predictive control design based on overparameterized delay-plant models and identified cancellation order.
PublicationPraca dotyczy uogólnionego sterowania predykcyjnego (GPC) obiektami opisanymi dyskretnoczasowymi modelami CARIMA z uproszczeniami (nieminimalnych, przeparametryzowanych) oraz o niezerowym opóźnieniu transportowym. Optymalne sterowanie predykcyjne wyznacza się na podstawie minimalnowariancyjnego oszacowania przyszłej odpowiedzi sterowanego obiektu. Poprzez analizę warunków rozwiązywalności zadania syntezy sterownika GPC, sformułowano...
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Wyjaśnienie przyczyn pocienienia rur w piecu technologicznym PC-1 na instalacji DRW II
PublicationWykonano analizę przyczyn korozji rur pieca instalacji DRW w oparciu o badania wizualne, SEM, EDX oraz literaturowe. W ciągu 5 lat eksploatacji nastąpiły znaczne ubytki korozyjne rur w wyniku procesów korozyjnych. Z uwagi na zbyt wysoką temperaturę rurek pieca nastąpił proces wysokotemperaturowego pylenia metalu.
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GC-MS analysis, antidiabetic and antioxidant activity of methanolic extract of pluteus cervinus: an in vitro and in silico approach
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PCR amplification with primers based on IS2404 and GC-rich repeated sequence reveals polymorphism in Mycobacterium ulcerans
PublicationOpracowano prostą w wykonaniu metodę genotypowania szczepów bakterii z gatunku Mycobacterium ulcerans. Polimorfizm genetyczny 32 badanych izolatów Mycobacterium ulcerans odzwierciedla ich geograficzne pochodzenie z rejonów Afryki Centralnej, Ameryki Południowej i Łacińskiej, Azji Południowo-Wschodniej, Malezji oraz Australii.
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GC-FID determination of C2-C4 aliphatic monocarboxylic acids in aqueous samples preceded by solvent extraction
PublicationEkstrakcja za pomocą eteru metylo-tert-butylowego (MTBE) została wykorzystana do izolacji krótkołańcuchowych alkanowych kwasów monokarboksylowych (2-4 atomy węgla w cząsteczce) z próbek o matrycy wodnej. Całkowita wydajność dwukrotnej ekstrakcji z próbek wodnych kwasów: octowego, propionowego i masłowego wynosiła odpowiednio ok. 55% , ok. 90% i ponad 90%. Wydajności ekstrakcji są porównywalne z wartościami uzyskiwanymi w przypadku...
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The application of isotopically labeled analogues for the determination of small organic compounds by GC/MS with selected ion monitoring
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Increased concentration of Taq DNA polymerase as a solution for GC-rich templates from clinical and environmental samples
PublicationDNA polymerase is an enzyme which plays crucial role in replication and DNA repair. It found application in PCR (polymerase chain reaction) where catalyses process of in vitro DNA synthesis. To meet the demands posed by mod- ern diagnostic, molecular biology or genetic engineering it is necessary to improve DNA polymerases to obtain new or better features useful in these fields. So far implemented modifications in majority are...
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Przegląd programów 2D oraz 3D do fotogrametrii na przykładzie PC- Rect oraz PhotoModeler
PublicationW pracy został podjęty temat przeglądu programów do fotogrametrii. Stwierdzono, że lawinowy rozwój informatyki sprawił, że eksperci zajmujący się zawodowo tematem zdarzeń drogowych pozyskali dostęp do specjalistycznego oprogramowania wspomagającego rekonstrukcję wypadków komunikacyjnych. Różnorodność problematyki rekonstruowania zdarzeń drogowych narzuciła konieczność stworzenia eksperckiego oprogramowania specjalnej grupy aplikacji....
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A novel method of Mycobacterium tuberculosis complex strain differentiation using polymorphic GC-rich gene sequences.
PublicationTuberculosis is one of the leading infectious diseases. In this work, a new genotyping method of Mycobacterium tuberculosis (Mtb) complex strain is presented. 27 Mtb genomes were analyzed for the presence of length polymorphism within polymorphic GC-rich gene sequences. Four genes, Rv3345c, Rv3507, Rv0747 and Rv3511, showing variation in length depending on the Mtb strain were selected for designing primer sequences flanking variable...
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Method development and validation for optimized separation of the major polyphenolics in propolis extracts using GC-MS method
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Research on the separation properties of empty-column gas chromatography (EC-GC) and conditions for simulated distillation (SIMDIS)
PublicationThe paper presents the results of investigations on new procedures of determination of selected cleaning additives in diesel fuel. Two procedures: one-step analysis using gas chromatography with flame ionization detection (GC-FID) or mass spectrometry (GC-MS) and a two-step procedure in which normal-phase high-performance liquid chromatography (NP-HPLC) was used for preliminary separation of the additives, were compared. The additive...
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Application of Electronic Nose Based on Fast GC for Authenticity Assessment of Polish Homemade Liqueurs Called Nalewka
PublicationThe possibility of application of electronic nose based on fast GC for differentiation of three types of cherry liqueurs, namely Polish homemade liqueurs called nalewka, commercially available liqueurs labeled as nalewka, and commercial liqueurs, was investigated. This device was equipped with two parallel connected columns with different stationary phases coupled to two ultrasensitive flame ionization detectors (μ-FIDs). Four...
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Krystian Zawadzki dr hab. inż.
PeopleKrystian Zawadzki is associate professor in the Department of Finance at the Faculty of Management and Economics of the Gdańsk University of Technology; member of the Polish Olympic Academy at the Polish Olympic Committee; coordinator of the Stock Exchange School (Warsaw Stock Exchange) in Gdańsk; Head of postgraduate studies "Capital Investments and Personal Finance Management"; member of the audit committee of the sports club...
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Marek Blok dr hab. inż.
PeopleMarek Blok in 1994 graduated from the Faculty of Electronics at Gdansk University of Technology receiving his MSc in telecommunications. In 2003 received Ph.D. and in 2017 D.Sc. in telecommunications from the Faculty of Electronics, Telecommunications and Informatics of Gdańsk University of Technology. His research interests are focused on application of digital signal processing in telecommunications. He provides lectures, laboratory...
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Energy-Aware Scheduling for High-Performance Computing Systems: A Survey
PublicationHigh-performance computing (HPC), according to its name, is traditionally oriented toward performance, especially the execution time and scalability of the computations. However, due to the high cost and environmental issues, energy consumption has already become a very important factor that needs to be considered. The paper presents a survey of energy-aware scheduling methods used in a modern HPC environment, starting with the...
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Zastosowanie funkcji kształtu elementu skończonego w modulacji szerokości impulsów na przykładzie modulacji dwufazowej z kompensacją napięcia niezrównoważenia w trójpoziomowym falowniku napięcia 3l-NPC
PublicationPrzedstawiono problem modulacji napięcia jako problem wyznaczania współrzędnych punktu figury lub bryły geometrycznej. Do wyznaczenia współczynników wypełnień w modulacji szerokości impulsów zastosowano funkcje kształtu elementu skończonego. Wskazano zalety takiego podejścia i możliwości uogólnienia algorytmu modulacji. Opisano algorytm modulacji dwufazowej SVPWM z kompensacją oscylacji napięcia niezrównoważenia z jednoczesną stabilizacją...
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Degradibility in vitro of polyurethanes based on synthetic atactic poly[)R,S)-3-hydroxybutyrate
PublicationThe aim of the paper was to determine the degradibility of aliphatic polyurethanes in hydrolytic and oxidative solutions. DSC, GPC, density, polymer surface morphology were studied.
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OCENA JAKOŚCI DESTYLATÓW ROLNICZYCH WYKONANYCH ZA POMOCĄ PROTOTYPU ELEKTRONICZNEGO NOSA I FAST/FLASH GC
PublicationPrzedstawiono wyniki badań oceny jakości destylatów rolniczych przy pomocy prototypu elektronicznego nosa i komercyjnego elektronicznego nosa typu Fast/Flash GC - HERACLES II. Prototyp był wyposażony w zestaw sześciu półprzewodnikowych czujników firmy FIGARO. HERACLES II wyposażony był w dwie kolumny chromatograficzne z różną polarnością fazy stacjonarnej oraz dwa detektory FID. Frakcję lotną próbek destylatu rolniczego wytwarzano...
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Development and validation of a GC–MS/MS method for the determination of 11 amphetamines and 34 synthetic cathinones in whole blood
PublicationPurpose Psychoactive compounds that contain a phenylethylamine structure (such as amphetamine-type stimulants and synthetic cathinones) are one of the major classes of stimulants on the recreational drug market. Approximately 670 new psychoactive substances (NPS) are monitored only in Europe; however, new psychoactive compounds are being developed for illicit trade each year. In this context, the development of new analytical procedures...
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Crystallographic studies of piperazine derivatives of 3-methyl-5-spirofluorenehydantoin in search of structural features of P-gp inhibitors
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Chromatografia gazowa z detekcją olfaktometryczną (GC-O) w analizie żywności. Cz. I. Charakterystyka metody
PublicationW ostatnich latach prowadzone są intensywne badania nad aktywnością sensoryczną poszczególnych składników zapachów żywności, a także napojów alkoholowych i nad zależnościami pomiędzy zapachem, a składem chemicznym lotnej frakcji tych produktów. Z oczywistych powodów największe zastosowanie w oznaczaniu lotnych substancji zapachowych znajduje chromatografia gazowa z różnymi wariantami detekcji. Większość osiągnięć w tej dziedzinie...
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<title>Distributed embedded-PC-based control and data acquisition system for TESLA cavity controller and simulator</title>
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Evaluation of the suitability of electronic nose based on fast GC for distinguishing between the plum spirits of different geographical origins
PublicationPlum spirits are obtained exclusively via the alcoholic fermentation and distillation of meaty plums or must composed of plums, with or without stones. The European countries such as Poland, the Slovak Republic, the Czech Republic, Bulgaria and Romania are the leading producers of this alcoholic beverage. Information about the authentication of plum spirits produced in different countries can be found in the published literature....
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Dual-Setting Bone Cement Based On Magnesium Phosphate Modified with Glycol Methacrylate Designed for Biomedical Applications
PublicationMagnesium phosphate cement (MPC) is a suitable alternative for the currently used calcium phosphates, owing to beneficial properties like favorable resorption rate, fast hardening, and higher compressive strength. However, due to insufficient mechanical properties and high brittleness, further improvement is still expected. In this paper, we reported the preparation of a novel type of dual-setting cement based on MPC with poly(2-hydroxyethyl...
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Analysis of pesticide residue in tomato samples using analytical protocol based on application of QuEChERS technique and GC-ECD system
PublicationQuEChERS sample preparation method was used for the determination of 10 pesticides and their metabolites in tomato samples, coupled to gas chromatography with electron capture detector (GCECD). The experimental parameters including oven temperature program, amount of the sample and purifying agent were optimized. The GC-ECD method was validated in terms of linearity, selectivity and recovery. The limits of detection (LODs) of the...
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Metodyka rozdzielania i oznaczania lotnych inhibitorów fermentacji w brzeczkach fermentacyjnych ciemnej fermentacji, techniką GC-MS
PublicationW pracy przedstawiono opracowaną w wyniku badań metodykę identyfikacji i oznaczania inhibitorów fermentacji w brzeczkach fermentacji ciemnej z biomasy ligno-celulozowej, z wykorzystaniem ekstrakcji ciecz-ciecz w sprzężeniu z chromatografią gazową ze spektrometrem mas (LLE-GC-MS). W ramach badań dokonano doboru korzystnych warunków ekstrakcji ciecz-ciecz, w tym: pH, objętości rozpuszczalnika ekstrakcyjnego, czasu ekstrakcji oraz warunków...
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LC-PDA-MS and GC-MS Analysis of Scorzonera hispanica Seeds and Their Effects on Human Breast Cancer Cell Lines
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PCR-Based Genotyping of Mycobacterium tuberculosis with New GC-Rich Repeated Sequences and IS6110 Inverted Repeats Used as Primers.
PublicationW pracy przedstawiono nową metodę genotypowania Mycobacterium tuberculosis. Zastosowanie oligonukleotydu Mtb1 5'-CCG-GCG-GGG-CCG-GCG-G lub Mtb2 5'-CGG-CGG-CAA-CGG-CGG-C wraz z oligonukleotydami specyficznymi do terminalnych sekwencji elementu insercyjnego IS6110 pozwala na różnicowanie szczepów Mycobacterium tuberculosis w metodzie PCR. Opracowana metoda może być wykorzystana w badaniach epidemiologicznych gruźlicy.
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Optimization of a novel procedure for determination of VOCs in water and human urine samples based on SBSE coupled with TD-GC-HRMS.
PublicationPodczas ozanczania lotnych związków chlorowcoorganicznych (t.j. bromodichlorometanu, dibromochlorometanu, bromoformu I tetrachloroetylenu) z próbek wody I moczu ludzkiego wykorzystano technikę ekstrakcji za pomocą ruchomego elementu sorpcyjnego typu Twister połączonego z desorpcją termiczną analitów do kolumny chromatografu gazowego wyposażonego w wysokosprawny spektrometr mas. Przeprowadzono optymalizację czasu (30 min) i prędkości...
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Determination of benzodiazepines and Z-hypnotic drugs in whole blood samples by GC–MS/MS: Method development, validation and application
PublicationBenzodiazepines (BZDs) and Z-drugs are widely used as anxiolytics, sedative hypnotics, anticonvulsants and muscle relaxants. “Designer benzodiazepines” (DBZDs) are a new psychoactive substance class consisting of benzodiazepine derivatives that are not allowed for medical use and are known for being used recreationally. From a toxicologist standpoint, the huge number of such substances implicate a necessity for developing fast...
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Chemical Characteristics and Thermal Oxidative Stability of Novel Cold-Pressed Oil Blends: GC, LF NMR, and DSC Studies
PublicationPlant oils contain a high content of unsaturated fatty acids. Studies of food products have revealed a considerable disproportion in the ratio of ω6 to ω3. This article presents information on the healthful qualities of eight new oil blends that contain a beneficial proportion of ω6 to ω3 fatty acids (5:1), as well as their degradation during heating at 170 and 200 °C. The fatty acid profile was analyzed by gas chromatography (GC),...
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Chromatografia gazowa z detekcją olfaktometryczną (GC-O) w analizie żywności. Cz. II. Metody i zastosowania
PublicationWygląd olfaktogramów ściśle zależy od procedury izolacji analitów oraz od stosowanej metody ilościowej. W pracy omówiono i porównano najczęściej stosowane metody ilościowe, takie jak: metody częstości detekcji, metody rozcieńczania do progu wyczuwalności i metody bezpośredniej intensywności.Szczególny nacisk położono na zastosowania omawianej techniki w analizie i ocenie jakości żywności. Przedstawiono liczne przykłady badań mających...
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Investigation of edible oils oxidation stability using photooxidation and SPME/GC method for determination of volatile compounds - preliminary investigation
PublicationOdporność olejów roślinnych na oksydatywną degradację prowadzącą do zjełczenia jest istotnym parametrem w ocenie jakości olejów. Artykuł przedstawia nową obiecującą metodę analizy lotnych produktów reakcji utleniania olejów. Jako czynnik przyspieszający proces utleniania olejów zastosowano promieniowanie ultrafioletowe. Badania zostały przeprowadzone przy zastosowaniu mikroekstrakcji do fazy stacjonarnej połaczonej z kapilarną...
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Urine metabolic fingerprinting using LC–MS and GC–MS reveals metabolite changes in prostate cancer: A pilot study
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APPLICATION OF RESPONSE SURFACE MODELING FOR OPTIMIZATION AND DETERMINATION OF MALONDIALDIALDEHYDE BY VORTEX-ASSISTED DISPERSIVE LIQUID-LIQUID MICROEXTRACTION AND GC-FID
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Modeling of wind wave induced sediment transport in the coastal zone of polish marine areas (Southern Baltic)
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Pore size distribution of PC-X (porous carbon materials obtained at various temperatures)
Open Research DataThese data contain pore size distribution of PC-700 (porous carbon materials obtained at 700°C), PC-800 (porous carbon materials obtained at 800°C) and PC-900 (porous carbon materials obtained at 900°C) analyzed by the nitrogen adsorption/desorption technique.
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Cryptocurrencies as a Speculative Asset: How Much Uncertainty is Included in Cryptocurrency Price?
PublicationThe aim of this paper is to examine the relationship between uncertainty indices (Geopolitical Uncertainty Index and Global Economic Policy Uncertainty Index) and cryptocurrencies. This study evaluated the behavior of cryptocurrencies with the evolution of uncertainties (GPU, EPU) on returns and volatility in terms of safe heaven as in traditional specualtive assets it increases their volaitility and reduces risk. For this purpose,...
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Method for the simultaneous determination of monoaromatic and polycyclic aromatic hydrocarbons in industrial effluents using dispersive liquid-liquid microextraction with GC-MS
PublicationWe present a new method for simultaneous determination of 22 monoaromatic and polycyclic aromatic hydrocarbons in postoxidative effluents from the production of petroleum bitumen using dispersive liquid-liquid microextraction coupled to gas chromatography and mass spectrometry. The eight extraction parameters including the type and volume of extraction and disperser solvent, pH, salting out effect, extraction and centrifugation...
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Utilization of standards generated in the process of thermal decomposition chemically modified silica gel for a single point calibration of a GC/FID system
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Comparison of Evaluation of Air Odour Quality in Vicinity of Petroleum Plant Using a Prototype of Electronic Nose Instrument and Fast GC Technique
PublicationThe paper presents the results of investigation on classification of the ambient air samples collected in a vicinity of the LOTOS Group S.A. petroleum plant with respect to odour. The investigations were carried out with an electronic nose prototype and a commercial electronic nose of Fast GC-type – HERACLES II. The prototype was equipped with a set of six semiconductor sensors by FIGARO Co. and a photoionization sensor of PID-type....
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Analysis of pesticide residue in fruits and vegetables using analytical analytical protocol based on application of QuEChERS technique and GC-ECD system
PublicationQuEChERS sample preparation method was used for the determination of 10 pesticides and their metabolites in fruits (apple, grape) and vegetables (tomato, paprika), coupled to gas chromatography with electron capture detector (GC-ECD). The experimental parameters including amount of the sample, types of solvents, extraction time and types of sorbent at the purification stage were optimized. The GC-ECD method was validated in terms...
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REcomMEndations for DIAgnostics and MaNagemenT of Arterial Hypertension in Adults Aged 65 Years and Older for General Practitioners — REMEDIA NT 65+ GP
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Process Control and Investigation of Oxidation Kinetics of Postoxidative Effluents Using Gas Chromatography with Pulsed Flame Photometric Detection (GC-PFPD)
PublicationThis article presents the results of investigations on the use of headspace analysis and gas chromatography with pulsed flame photometric detection (HSA-GC-PFPD) to evaluate the effectiveness of oxidation of postoxidative effluents from the production of bitumens. Samples of effluents from the bitumen oxidation unit were used in the experiments. In addition, the kinetics of effluent oxidation was also investigated. The content...
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Rapid method for the determination of organochlorine pesticides and PCBs in fish muscle samples by microwave-assisted extraction and analysis of extracts by GC-ECD
PublicationA procedure for the multiresidue determination of organochlorine pesticides and polychlorinated biphenyls in fish muscle samples has been developed. The method is based on the microwave-assisted extraction (MAE) of food samples from an acetonitrile-water (95 + 5, v/v) mixture followed by SPE cleanup of the extracts and analysis by GC with an electron capture detector. MAE operational parameters, such as the extraction solvent,...
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The potential role of fatty acids in prostate cancer determined by GC–MS analysis of formalin-fixed paraffin-embedded tissue samples
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Miniaturized, green salting-out liquid–liquid microextraction coupled with GC–MS used to evaluate biogenic amines in wine samples
PublicationMonitoring of the biogenic amines (BAs) content in food products, including wine, is important due to the health and safety of consumers and from the quality control point of view. In a given study, simultaneous derivatization and salting-out liquid–liquid microextraction (SALLME) coupled with GC–MS for BAs determination from wine samples was developed. For the optimization the Box-Behnken design was applied, where three independent...