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Tytuł:
Effect of the Addition of Apple Pomace and Erythritol on the Antioxidant Capacity and Antidiabetic Properties of Shortbread Cookies
Autorzy:
Raczkowska, Ewa
Wojdyło, Aneta
Nowicka, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/31341114.pdf
Data publikacji:
2024-05-17
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
apple pomace
erythritol
shortbread cookies
LC-MS
antidiabetic activity
antioxidant activity
Opis:
Apple processing into juice generates vast amounts of a by-product, namely fruit pomace, which poses a serious problem for the processing industry. At the same time, fruit pomace features a high health potential. The aim of the present study was to develop recipes of 8 variants of cookies with wheat flour substituted by apple pomace (0, 10, 30 and 50% of flour weight), sweetened with sucrose and erythritol. The cookies were analyzed for their nutritional value; antioxidant capacity (ABTS•+ scavenging activity and oxygen radical absorption capacity – ORAC); the ability to inhibit α-amylase, α-glucosidase and pancreatic lipase; and consumer acceptability. In total, 13 phenolic compounds were identified in the cookies with pomace. Cookies with 50% addition of apple pomace had an approximately 8-fold higher content of dietary fibre than traditional products (without the apple pomace) and simultaneously reduced energy value (by 32.6 and 40.5 kcal/100 g of cookies sweetened with sucrose and erythritol, respectively). The antioxidant capacity of cookies was 0.032–0.316 mmol TE/100 g in the ABTS assay and 1.153–2.070 mmol TE/100 g when ORAC was determined. The IC50 enabling α-amylase and α-glucosidase inhibition ranged from 138.1 to 221.8 mg/mL and from 976.4 to 1374.9 mg/mL, respectively. The anti-lipase activity of cookies with the addition of 50% apple pomace and erythritol was the highest (IC50 of 7.3 mg/mL). Both antioxidant capacity and antidiabetic potential increased significantly with the increasing proportion of pomace in cookies. Replacing sucrose with erythritol favorably influenced the consumer assessment. The study results show that the proposed products can be a perfect alternative to traditional sweet snack products, especially for consumers with diet-related diseases. The feasibility of using waste raw materials, which are a challenge to the food industry, has been proven as well.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 147-161
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metabolomic analysis of biological material using LC-MS in the quest for urinary system cancer biomarkers - review
Autorzy:
Szuberla, Wiktoria
Wrona, Maria
Powiązania:
https://bibliotekanauki.pl/articles/31342652.pdf
Data publikacji:
2024
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
mass spectrometry
metabolomics
LC-MS
kidney cancer
renal cell carcinoma
bladder cancer
spektrometria mas
metabolomika
rak nerki
rak nerkowokomórkowy
rak pęcherza moczowego
Opis:
Renal cell carcinoma (RCC) and bladder cancer (BC) are among the most frequently diagnosed urinary system cancers worldwide. They are characterized by high mortality and recurrence rates. In response to the rising incidence and mortality rates, scientists are exploring innovative diagnostic and therapeutic methods. Metabolomics, which analyzes metabolite levels, may enable early diagnosis and monitoring of therapy progress. Compared to other omics technologies, it focuses on the outcomes of metabolite activity, providing a unique perspective on processes occurring in cancer cells. Metabolomic analyses utilize techniques such as mass spectrometry. These methods allow the identification of biomarkers and precise determination of the chemical composition of biological samples. However, the most commonly used method is liquid chromatography-mass spectrometry (LC-MS), which enables the most comprehensive screening of cancer metabolomes. Recent studies show significant progress in recognizing characteristic metabolites associated with urological cancers, although this area remains partially unexplored. Research on circulating metabolites, especially those present in easily accessible samples like blood or urine, demonstrates promising potential in clinical practice. Study results reveal differences in metabolic profiles between various stages of cancer development, which may have clinical significance. The future of this field involves an increasing number of clinical cohorts, standardization of sample preparation, and further improvements in instrument sensitivity and speed. LC-MS-based metabolomics has the potential to contribute to the improvement of diagnostics, therapy, and the quality of life of patients with some urological cancers. However, challenges, such as the lack of uniform methodologies and understanding of metabolite determinants, require further research and innovation.
Źródło:
Chemical Technology & Biotechnology; 2024, 4; 70-75
2720-6793
Pojawia się w:
Chemical Technology & Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Contribution to the Study of Traces of Psychotropic Substances Inside Miniature Vessels and Collared Flasks of the Eneolithic Funnel Beaker culture (FBC) from Poland
Autorzy:
Taras, Halina
Zakościelna, Anna
Osak, Marcin
Buszewicz, Grzegorz
Teresiński, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/38620704.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
psychoactive substances
miniature vessels
Eneolithic
SE group of the FBC
Polska
GC-MS/MS
LC-MS/MS
Opis:
The text presents the results of laboratory analyses conducted on vegetal intoxicating substances identified on the walls of selected pottery forms discovered at Polish sites attributed to the south-eastern group of the FBC. The samples taken from miniature vessels and collared flasks were examined using the GC-MS/MS method (triple quadrupole) and then the reference method LC-MS/MS (linear ion trap). As a result of the research, psychotropic substances were identified in four samples: papaverine, scopolamine and atropine.  
Źródło:
Analecta Archaeologica Ressoviensia; 2023, 18; 97-102
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Betaxanthin Profiling in Beta vulgaris Leaves and Gymnocalycium mihanovichii Grafted Cacti: A Comprehensive Study
Autorzy:
Spórna-Kucab, Aneta
Tekieli, Anna
Knapek, Magdalena
Zużałek, Marta
Wybraniec, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/24024625.pdf
Data publikacji:
2023-12-05
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
beet
betalains
colorants
grafted cactus
LC-MS
secondary metabolites
Opis:
This study was focused on the identification and quantification of betaxanthins using high-performance liquid chromatography with a diode array detector coupled to electrospray ionisation mass spectrometry (HPLC-DAD-ESI-MS) in leaves of various cultivars of Beta vulgaris (beet) and Gymnocalycium mihanovichii grafted cacti. In G. mihanovichii grafted cacti, four betaxanthins, namely histidine-Bx, histamine-Bx, serine-Bx, and proline-Bx, were tentatively identified in the yellow, orange, pink, and red varieties, with contents ranging from 0.09 to 1.55 mg/kg fresh weight (FW). Betaxanthins were not detected in the green cactus. Histidine-Bx was the prevailing betaxanthin compound in the majority of cultivars. Fifteen betaxanthins were successfully identified in the leaves of five B. vulgaris cultivars (cv.): Snow Ball, Boldor, Cylindra, Rhubarb, and Round Dark Red. Leaves of yellow beet (cv. Boldor) had the highest total betaxanthin content (20.4 mg/kg FW), while white beet (cv. Snow Ball) had the lowest one (3.43 mg/kg FW). The leaves of red cultivars had comparable betaxanthin contents, ranging from 13.4 to 18.8 mg/kg FW, similary to the yellow cultivar, indicating their potential as valuable sources of betaxanthins. There was no single dominant betaxanthin in B. vulgaris leaves. The leaves of B. vulgaris were found to be a richer source of betaxanthin than the grafted cactus G. mihanovichii, which opens up new prospects for research into the potential utilization of these compounds in the industry.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2023, 73, 4; 375-384
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technika LC-MS/MS jako metoda oznaczania izoprostanów: krótki przegląd literatury
LC-MS/MS as a method for the determination of isoprostanes: a brief review
Autorzy:
Król, Magdalena B.
Brzeźnicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2188852.pdf
Data publikacji:
2023-05-19
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
markery stresu oksydacyjnego
izoprostany
peroksydacja lipidów
zastosowanie izoprostanów
LC-MS/MS
izomery prostaglandyn
oxidative stress markers
isoprostanes
lipid peroxidation
application of isoprostanes
prostaglandin isomers
Opis:
Izoprostany to duża grupa związków, które budową przypominają prostaglandyny. Powstają jako produkty wolnorodnikowej reakcji utleniania wielonienasyconych kwasów tłuszczowych i występują powszechnie we wszystkich tkankach oraz płynach biologicznych ciała w możliwym do oznaczenia stężeniu. Od 2018 r. oznaczanie izoprostanów techniką wysokosprawnej chromatografii cieczowej lub gazowej sprzężonej ze spektrometrią mas jest uznawane za złoty standard wśród oznaczeń markerów stresu oksydacyjnego w kontekście oksydacyjnych uszkodzeń lipidów. Publikacja jest syntetycznym przeglądem najnowszej literatury dotyczącej wykorzystania izoprostanów jako markera peroksydacji lipidów z użyciem techniki wysokosprawnej chromatografii cieczowej sprzężonej z tandemową spektrometrią mas. Przedstawiono w niej wyniki badań wykorzystujące oznaczanie izoprostanów w pracy klinicystów i wskazano potencjał zastosowania tych oznaczeń do monitoringu osób pracujących w narażeniu na szkodliwe substancje oraz ich przydatność w badaniach dotyczących stylu życia. Med. Pr. 2023;74(2)
Isoprostanes are a large group of compounds formed as products of free radical oxidation of polyunsaturated fatty acids, which are isomers of prostaglandin. They are present in all body tissues and biological fluids in quantifiable concentrations. Since 2018, the determination of isoprostanes by chromatographic technique with mass spectrometry is the golden standard of the oxidative stress markers determination in relation to oxidative damage to lipids. The publication is a synthetic review of recently published articles on the use of isoprostanes as a marker of lipid peroxidation determined with the liquid chromatography with tandem mass spectrometry technique. It presents the results of research using isoprostanes as a marker in medicine, in monitoring people working in exposure to harmful substances and in lifestyle research. Med Pr. 2023;74(2)
Źródło:
Medycyna Pracy; 2023, 74, 2; 119-125
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Triterpene Saponin Composition of White, Yellow and Red Beetroot (Beta vulgaris L.)
Autorzy:
Spórna-Kucab, Aneta
Tekieli, Anna
Skalicka-Woźniak, Krystyna
Grzegorczyk, Agnieszka
Świergosz, Tomasz
Wybraniec, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2051041.pdf
Data publikacji:
2022-06-06
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
betavulgarosides
Beta vulgaris L
food composition
LC-MS/MS
oleanolic acid
saponins
Opis:
Beta vulgaris L. is an important source of bioactive saponins – a group of secondary metabolites – that have spurred a growing interest due to their health-promoting properties. This study aimed to gain information on triterpene saponin profile of the peel and flesh of white, yellow and red beet of six cultivars – Snow Ball, Boldor, Ceryl, Chrobry, Forono and Tytus – harvested in Poland, in the same region. Twenty four saponins with oleanolic acid, hederagenin, akebonoic acid and gypsogenin as aglycons were identified and quantified by liquid chromatography/tandem mass spectrometry (LC-ESI-MS/MS). Among them, betavulgaroside I, II, III and IV were the major compounds, but the quantitative profile of saponins was found to be dependent on beet cultivar and root part, respectively. The highest content of saponins was found in the peel of yellow B. vulgaris Boldor (20812 mg/kg fresh weight, fw), while the lowest saponin content was determined in the flesh of white B. vulgaris Snow Ball (497 mg/kg fw). In addition, the total saponin content in peel and flesh in yellow beet (26054 mg/kg fw) was much higher than the total content in peel and flesh in red beet Tytus (8364 mg/kg fw) and white beet Snow Ball (1204 mg/kg fw). This is the first report on the profile of saponins in white and yellow beets.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 159-170
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kryteria kwalifikujące samozatrudnionego jako pracownika półzależnego (część 1)
Criteria qualifying a self-employed person as a semi-dependent employee. Part 1
Autorzy:
Kobroń-Gąsiorowska, Łucja
Powiązania:
https://bibliotekanauki.pl/articles/2055467.pdf
Data publikacji:
2022-02-17
Wydawca:
Wyższa Szkoła Humanitas
Tematy:
pracownik półzależny
środki produkcji
samozatrudniony
art. 22 k.p.
stosunek pracy
podejście celowe
interpretacja teleologiczna
a semi-independent employee
means of production
self-employed
art. 22 LC
employment relationship
target approach
teleological interpretation
Opis:
Obecny stan prawny chroniący tylko pracowników w rozumieniu art. 2 k.p. oraz w nieznacznej części zleceniobiorców przyczynia się do pogorszenia sytuacji samozatrudnionych półzależnych, wywołując w rezultacie skutki wręcz odwrotne do zamierzonych, tj. inkluzji aksjologii funkcji ochronnej na niepracownicze formy świadczenia pracy. W związku z tymi wątpliwościami pojawiają się postulaty zasadniczego podwyższenia standardów ochronnych, a nawet swoistej deregulacji w tym zakresie. Autorka zakłada istnienie kategorii pośredniej samozatrudnionych, którzy są również ekonomicznie zależni od swoich kontrahentów. Zatem należałoby podjąć dyskusję, czy mogliby oni zostać zaliczeni pośrednio do pracowników, co w konsekwencji skutkowałoby zastosowaniem wobec nich przynajmniej niektórych praw pracowniczych. Obecnie nie podejmuje się prawie żadnej dyskusji na temat „kategorii pośredniej” czy określenia kryteriów mogących zakwalifikować taki charakter obowiązków i zależności do stosunku pracy.
The current legal status protecting only employees within the meaning of Art. 2 of the Labor Code and in a small part of contractors, contributes to the deterioration of the situation of semi-dependent self-employed workers, resulting in effects that are opposite to the intended ones, i.e., the inclusion of the axiology of the protective function into non-employee forms of work. In connection with these doubts, there are demands to increase protection standards and even deregulate in this respect substantially. The author assumes the existence of an intermediate category of the self-employed, who are also economically dependent on their contractors. Therefore, it should be discussed whether they could be classified indirectly as employees, which would result in applying at least some employee rights to them. At present, there is hardly any discussion about the „intermediate category” or the definition of criteria that would qualify such nature of obligations and dependence on the employment relationship.
Źródło:
Roczniki Administracji i Prawa; 2021, 3, XXI; 157-169
1644-9126
Pojawia się w:
Roczniki Administracji i Prawa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scutellaria baicalensis: the end of the flavone biosynthesis pathway
Autorzy:
Elkin, Y.N.
Kulesh, N.I.
Shishmarev, V.M.
Kargin, V.M.
Manyakhin, A.Y.
Powiązania:
https://bibliotekanauki.pl/articles/2142056.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Chinese skullcap
LC-MS analysis
OMe flavones
oroxylin A
root bark
wogonin
Opis:
The report demonstrates that plenty of methylated flavones of the plant, as the end product of the flavone biosynthesis pathway, are concentrated in the root bark, which largely remains in the waste that makes up 7% w/w of the commercial root and is discarded. The study of the waste extract showed that the last enriched with monomethylated flavones wogonin and oroxylin A, along with some polymethylated ones represent an end of the biosynthesis pathway of flavones in the plant. In addition to wogonin, 7 known methylated flavones were found for the first time in the root bark. Due to a high content of wogonin and oroxylin A in the extract, these flavones were concentrated using preparative liquid chromatography. As a result, the obtained complex of these two target flavones turned out to be 0.8% w/w of the waste. Such morphologically specific accumulation of methylated flavones at the root boundary raises the question of their role in plant life.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2022, 64, 1; 39-43
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Note on Gödel-Dummet Logic LC
Autorzy:
Robles, Gemma
Méndez, José M.
Powiązania:
https://bibliotekanauki.pl/articles/2033854.pdf
Data publikacji:
2021-07-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Intermediate logics
Gödel-Dummet logic LC
Opis:
Let \(A_{0},A_{1},...,A_{n}\) be (possibly) distintict wffs, \(n\) being an odd number equal to or greater than 1. Intuitionistic Propositional Logic IPC plus the axiom \((A_{0}\rightarrow A_{1})\vee ...\vee (A_{n-1}\rightarrow A_{n})\vee (A_{n}\rightarrow A_{0})\) is equivalent to Gödel-Dummett logic LC. However, if \(n\) is an even number equal to or greater than 2, IPC plus the said axiom is a sublogic of LC.
Źródło:
Bulletin of the Section of Logic; 2021, 50, 3; 325-335
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecotoxicological effect of heavy metals in free-living ciliate protozoa of Lake Maracaibo, Venezuela
Autorzy:
Castro Echavez, Fernando Luis
Marín-Leal, Julio César
Powiązania:
https://bibliotekanauki.pl/articles/2048501.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
contamination
ecotoxicological tests
lethal concentration LC50
microbiological indicators of early warning
toxicity
Opis:
Multiple anthropogenic agents have turned Lake Maracaibo into a hypereutrophic environment. Heavy metals resulting from the steel and oil industry augment pollution in the lake. There is a lack of research on the ecotoxicological effect of heavy metals in protozoa. To evaluate the ecotoxicological effect of Cr 3+ , Cr6+ , Cd2+ , Pb2+ and Ni2+ on free-living ciliated protozoa and to identify suitable ciliated protozoa candidates for bioindicators of water quality; we estimated the lethal concentration for 50% of the protozoa population (LC50 ) in samples from two stations (S1 : narrow of Maracaibo and S2 : South of the lake) using ecotoxicological tests in the Sedgewick–Rafter chamber and Probit analysis. The general toxicity patterns obtained for S1 protozoa (Euplotes sp. and Oxytricha sp.) were Cr3+ > Cd2+ > Pb2+ > Cr6+ > Ni2+ ; and those corresponding to S2 (Coleps sp. and Chilodonella sp.) were Cr6+ > Cr3+ > Cd2+ > Pb2+ >Ni2+. We found statistically significant difference (p < 0.05) in the LC50 of protozoa exposed to Cr3+, Cr6+, Ni2+ and Pb2+ when comparing the two sampling stations. The differences observed in toxicity patterns are probably the result of various kinds of protozoa adaptation, possibly induced by various sources, levels and incidents of exposure to heavy metals contamination of the protozoa studied and to the physicochemical conditions prevailing in the two selected stations. The levels of tolerance observed in the present study, allow us to infer that S2 ciliates are the most susceptible to the contaminants studied and can be used as possible microbiological indicators that provide early warning in studies of contamination by heavy metals in Lake Maracaibo.
Źródło:
Journal of Water and Land Development; 2021, 51; 102-116
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous determination of lopinavir, saquinavir and ritonavirin in human plasma using liquid chromatography – ion trap mass spectrometry
Autorzy:
Lipiński, Marcin
Bielawski, Krzysztof P.
Słomińska, Ewa M.
Smoleński, Ryszard T.
Powiązania:
https://bibliotekanauki.pl/articles/1891025.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
antiviral therapy
lopinavir
saquinavir
ritonavir
LC/MS
Opis:
Background: Lopinavir, saquinavir, and ritonavir are viral protease inhibitors (PIs) developed for and widely used in the therapy of human immunodeficiency virus (HIV)-related disease. These compounds are also active in vitro against the pathogens causing tuberculosis, malaria and coronavirus infections. PIs have been regarded as a platform for the design of inhibitors targeting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-encoded proteases. This study aimed to develop a liquid chromatography/mass spectrometry (LC/MS) procedure for accurate simultaneous determination of concentrations of these three PIs in the plasma. Methods: Samples of human plasma were protein precipitated with 0.3 M zinc sulfate in a water/methanol solution (30:70, v/v). The extracts were analyzed with reversed-phase chromatography coupled with the electrospray ionization (ESI) source of the ion trap mass detector operating in mEass spectrometry (MS) and tandem mass spectrometry (MS/MS) modes. Results: Calibration curves demonstrated good linearity from 0.01 to 10 µg/mL and acceptable reproducibilities and recoveries. Conclusions: The described procedure proves that a very basic ion-trap LC/MS system could be applied for selective, rapid, and precise determination of antiviral protease inhibitors.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 60-67
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioinformatic insight into Portulaca oleracea L. (Purslane) of Bulgarian and Greek origin
Autorzy:
Balabanova, V.
Hristov, I.
Zheleva-Dimitrova, D.
Sugareva, P.
Lozanov, V.
Gevrenova, R.
Powiązania:
https://bibliotekanauki.pl/articles/2117810.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Portulaca oleracea
LC–HRAMS
secondary metabolites
descriptive analysis
multivariate statistics
Opis:
Portulaca oleracea L. (Portulacaceae) is used as functional food and its nutritional and therapeutic properties are related to the high levels of organic and fatty acids, polyphenols, polysaccharides and cyclo-dopa amides. This study presents a strategy based on liquid chromatography – high resolution accurate mass spectrometry method (LC – HRAMS) and bioinformatic methods to analyze 33 purslane accessions originating from 11 floristic regions in Bulgaria together with 5 accessions of Greek provenance. Extracts were obtained by microwave extraction. Based on the LC-MS metabolic “fingerprints” of assayed samples, a purslane metabolic database was developed. LC-MS data were proceeded with Software application Compound Discover 2.0 (Thermo Fischer Sci., USA). Principal Component Analysis (PCA) combined with both descriptive and differential analyses were used to find marker metabolites to distinguish different geographical regions. The differential analysis of the Bulgarian and Greek samples allowed the identification of 50 marker metabolites. Based on accurate masses, retention times, fragmentation patterns in MS/MS, comparison with commercial standards and literature data, these secondary metabolites were identified after detailed analysis of Volcano-plots. For the first time, 29 compounds are reported. The identified compounds were used to perform a study of the biosynthetic pathways of purslane secondary metabolites using Kyoto Encyclopedia of Genes and Genomes (KEGG) software platform. The statistical treatments identified marker compounds that can be used to distinguish the origin of accession set. Combining LC-MS data with multivariate statistical analysis was shown to be effective in studying the purslane metabolites, allowing for integration of chemistry with geographic origin.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2020, 62, 1; 7-21
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
Autorzy:
Van, H.T.
Nguyen, T.T.
Ton, H.T.T.
Dinh, K.T.T.
Le, V.S.
Pham, T.V.
Tran, G.B.
Powiązania:
https://bibliotekanauki.pl/articles/2096309.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rothmannia wittii
extract
phytochemical composition
antibacterial activity
LC-MS
Opis:
Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 301-307
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive current control of three-phase matrix converter with GaN HEMT bidirectional switches
Autorzy:
Nowaszewski, K.
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/202007.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive control
matrix converter
GaN HEMT
LC filter
bidirectional switch
Opis:
This paper presents an analysis and simulation studies of three-phase matrix converter with GaN HEMT bidirectional switches with predictive control of grid currents and converter output currents. Two methods of grid currents shaping are described and compared. The first method is based on calculations of instantaneous grid reactive power and the second one uses the active power of the load. The analyzed converter works with the resistive-inductive load, and from the grid side the LC filter with damping resistor has been used.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1077-1085
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The defect analysis of Inconel 738LC with computed tomography inspection
Autorzy:
Ciećko, Andrzej
Kamiński, Łukasz
Wierzba, Patrycja
Powiązania:
https://bibliotekanauki.pl/articles/175802.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computed tomography
CT
material defects
Inconel 738LC
tensile test
chemical analysis
material properties
nondestructive
Inconel
Opis:
In the present paper, computed tomography (CT) inspection is shown. The CT inspection method allowed to rate the density of defects hidden inside a material, which has a significant role in the live material. The method allows to evaluate the reliability of tensile test’s results. In our analysis, the position of crack propagation was determined by CT, and the tensile test was performed to check the accuracy of the nondestructive method. The tensile tests were performed on Inconel 738LC [1] samples.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 3; 80-83
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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