Log in

Relevant bibliographies by topics / Spectrophotometric detection with diode matrix (DAD) / Journal articles

To see the other types of publications on this topic, follow the link: Spectrophotometric detection with diode matrix (DAD).

Journal articles on the topic 'Spectrophotometric detection with diode matrix (DAD)'

Author: Grafiati

Published: 24 April 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 33 journal articles for your research on the topic 'Spectrophotometric detection with diode matrix (DAD).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Petukhova, Svetlana Andreyevna, Daniil Nikolayevich Olennikov, and Vera Mikhaylovna Mirovich. "TRITERPENE COMPOUNDS OF THE ABOVE GROUND ORGANS OF THE BUPLEURUM SCORZONERIFOLIUM WILLD. OF THE BAIKAL REGION FLORA." chemistry of plant raw material, no. 4 (December 27, 2019): 215–22. http://dx.doi.org/10.14258/jcprm.2019045354.

Full text

Abstract:

Representatives of the genus Bupleurum L. in the composition of biologically active substances accumulate triterpene compounds (derivatives of α-amyrin and β-amyrin). Triterpene glycosides isolated from plants of the genus Bupleurum are called saikosaponinov, buplevrozidy, skorzonerozidy. Plants of the genus Bupleurum in the underground organs accumulate triterpene compounds in an amount of from 1 to 7%. Triterpene compounds of plants of the genus Bupleurum possess a hepatoprotective, antiviral, cytostatic effect. We have studied the triterpene compounds of the aerial organs of Bupleurum scorz

APA, Harvard, Vancouver, ISO, and other styles

2

Veizerová, L., J. Piešťanský, K. Maráková, et al. "Comparison of column-coupled electrophoresis with liquid chromatography methods in food analysis of quinine." Acta Facultatis Pharmaceuticae Universitatis Comenianae 59, no. 1 (2012): 67–80. http://dx.doi.org/10.2478/v10219-012-0011-y.

Full text

Abstract:

Comparison of column-coupled electrophoresis with liquid chromatography methods in food analysis of quinineComparison of column-coupled electrophoresis with liquid chromatography methods in food analysis of quinine (QUI) is presented in this work. The capillary isotachophoresis (CITP) on-line coupled with capillary zone electrophoresis (CZE) and hyphenated with fibre-based spectrophotometric diode array detection (DAD) was compared with, (i) high performance liquid chromatography (HPLC) method with DAD detection, and (ii) HPLC method with fluorescence detection (FD). These methods were compare

APA, Harvard, Vancouver, ISO, and other styles

3

Vaclavik, Lukas, Frantisek Benes, Marie Fenclova, et al. "Quantitation of Cannabinoids in Cannabis Dried Plant Materials, Concentrates, and Oils Using Liquid Chromatography–Diode Array Detection Technique with Optional Mass Spectrometric Detection: Single-Laboratory Validation Study, First Action 2018.11." Journal of AOAC International 102, no. 6 (2019): 1822–33. http://dx.doi.org/10.5740/jaoacint.18-0426.

Full text

Abstract:

This paper describes a single-laboratory validation of a liquid chromatography–diode array detection (LC–DAD) method for quantification of 12 major cannabinoids in Cannabis dried plant materials, concentrates, and oils. The method met Standard Method Performance Requirements for quantitative analysis of cannabinoids in Cannabis concentrates and Cannabis dried plant materials. The LOQs were in the range 0.003–0.10% (w/w), depending on the analyte and matrix. Spike recoveries were between 96.7 and 101.3% with relative SDs (RSDs) ≤2.3%. Precision expressed as repeatability and intermediate precis

APA, Harvard, Vancouver, ISO, and other styles

4

Vaclavik, Lukas, Frantisek Benes, Marie Fenclova, et al. "Quantitation of Cannabinoids in Cannabis Dried Plant Materials, Concentrates, and Oils Using Liquid Chromatography–Diode Array Detection Technique with Optional Mass Spectrometric Detection: Single-Laboratory Validation Study, First Action 2018.11." Journal of AOAC INTERNATIONAL 102, no. 6 (2019): 1822–33. http://dx.doi.org/10.1093/jaoac/102.6.1822.

Full text

Abstract:

Abstract This paper describes a single-laboratory validation of a liquid chromatography–diode array detection (LC–DAD) method for quantification of 12 major cannabinoids in Cannabis dried plant materials, concentrates, and oils. The method met Standard Method Performance Requirements for quantitative analysis of cannabinoids in Cannabis concentrates and Cannabis dried plant materials. The LOQs were in the range 0.003–0.10% (w/w), depending on the analyte and matrix. Spike recoveries were between 96.7 and 101.3% with relative SDs (RSDs) ≤2.3%. Precision expressed as repeatability and intermedia

APA, Harvard, Vancouver, ISO, and other styles

5

Loper, Bobby L., and Kim A. Anderson. "Determination of Pyrethrin and Pyrethroid Pesticides in Urine and Water Matrixes by Liquid Chromatography with Diode Array Detection." Journal of AOAC INTERNATIONAL 86, no. 6 (2003): 1236–40. http://dx.doi.org/10.1093/jaoac/86.6.1236.

Full text

Abstract:

Abstract The following pyrethrin and pyrethroid pesticides were determined in urine and water matrixes by liquid chromatography with diode array detection (LC–DAD): pyrethrin I, pyrethrin II, tetramethrin, baythroid, bifenthrin, fenvalerate, phenothrin, allethrin, resmethrin, cis-permethrin, and trans-permethrin. In addition, 3-phenoxybenzyl alcohol, a metabolite of various pyrethroids, was also successfully determined by the analytical method. The matrix extraction was simple, inexpensive, and fast, using only sodium chloride and acetonitrile. The acetonitrile extract was filtered and analyze

APA, Harvard, Vancouver, ISO, and other styles

6

Michiu, Delia, Maria-Ioana Socaciu, Melinda Fogarasi, et al. "Implementation of an Analytical Method for Spectrophotometric Evaluation of Total Phenolic Content in Essential Oils." Molecules 27, no. 4 (2022): 1345. http://dx.doi.org/10.3390/molecules27041345.

Full text

Abstract:

Over the past decade, there has been growing interest in polyphenols’ research since these compounds, as antioxidants, have several health benefits, such as preventing neurodegenerative diseases, inflammation, cancer, cardiovascular diseases, and type 2 diabetes. This study implements an analytical method to assess the total phenolic content (TPC) in essential oils using Folin–Ciocalteu’s phenol reagent and quantifies the individual phenolic compounds by liquid chromatography. Thus, the research design and methodology included: (1) extraction of essential oil from dried thyme leaves by hydrodi

APA, Harvard, Vancouver, ISO, and other styles

7

Ghinea, Ioana Otilia, Maria Daniela Ionica Mihaila, Giorgiana-Valentina Blaga (Costea), et al. "HPLC-DAD Polyphenolic Profiling and Antioxidant Activities of Sorghum bicolor during Germination." Agronomy 11, no. 3 (2021): 417. http://dx.doi.org/10.3390/agronomy11030417.

Full text

Abstract:

The purpose of this study was to assess the suitability of the Romanian Albanus hybrid of Sorghum bicolor as a potential functional food ingredient. Ultrasound-assisted extraction in different solvents, together with spectrophotometric and chromatographic methods, was used to monitor the variation in total phenolic and flavonoid content and the antioxidant activity of raw sorghum grains before and during short germination periods (24, 36 and 48 h). The High-Performance Liquid Chromatography with Diode-Array Detection (HPLC-DAD) investigation of the extracts revealed that the ungerminated sorgh

APA, Harvard, Vancouver, ISO, and other styles

8

Vasyliev, Georgii S., Victoria I. Vorobyova, and Olga V. Linyucheva. "Evaluation of Reducing Ability and Antioxidant Activity of Fruit Pomace Extracts by Spectrophotometric and Electrochemical Methods." Journal of Analytical Methods in Chemistry 2020 (December 14, 2020): 1–16. http://dx.doi.org/10.1155/2020/8869436.

Full text

Abstract:

The component profiles of apricot, grape, and black currant pomace extracts have been analyzed using HPLC coupled to diode-array detection and tandem mass spectrometry (HPLC-DAD-MS). The predominant components in grape, apricot, and black currant pomace extracts were phenolic acids and flavonols. The redox behavior of apricot, black currant, and grape pomace water extracts was evaluated by means of cyclic voltammetry. Also, individual substances mainly present in the extracts were analyzed. The results of electrochemical testing were compared to traditional chemical techniques of potassium fer

APA, Harvard, Vancouver, ISO, and other styles

9

Vidal, Òscar, Xavier Castilla, Núria Aliaga-Alcalde, et al. "Determination of Curcuminoids by Liquid Chromatography with Diode Array Detection: Application to the Characterization of Turmeric and Curry Samples." Current Analytical Chemistry 16, no. 2 (2020): 95–105. http://dx.doi.org/10.2174/1573411014666180629125729.

Full text

Abstract:

Background: A simple, rapid and efficient method for the determination of curcumin and other polyphenols in turmeric and curry samples was here developed. The method relied on sample extraction with methanol and extract analysis by liquid chromatography with diode array detection (HPLC-DAD). Methods: The separation of components was carried out in reversed-phase mode using an elution gradient based on 0.1% (v/v) formic acid aqueous solution and acetonitrile as the components of the mobile phase. Chromatograms were recorded at 420 nm for specific monitoring of curcumin and related compounds. Re

APA, Harvard, Vancouver, ISO, and other styles

10

Capitán-Vallvey, Luis Fermin, Ramon Checa-Moreno, and Natalia Navas. "Rapid Ultraviolet Spectrophotometric and Liquid Chromatographic Methods for the Determination of Natamycin in Lactoserum Matrix." Journal of AOAC INTERNATIONAL 83, no. 4 (2000): 802–8. http://dx.doi.org/10.1093/jaoac/83.4.802.

Full text

Abstract:

Abstract Two rapid and simple methods were developed for the determination of natamycin in lactoserum matrix by ultraviolet (UV) spectrophotometry and liquid chromatography (LC) with diode-array detection. The methods involve protein precipitation with methanol, followed by centrifugation. No cleanup is necessary. The applicable concentrations of natamycin in lactoserum range from 2 to 500 mg/L for samples analyzed by both methods. The detection and quantitation limits are 0.07 and 0.23 mg/L, respectively, for the UV spectrophotometric method and 0.1 and 0.32 mg/L, respectively, for the LC met

APA, Harvard, Vancouver, ISO, and other styles

11

Bittová, Miroslava, Eliška Krejzová, Vendula Roblová, Petr Kubáň, and Vlastimil Kubáň. "Monitoring of HPLC profiles of selected polyphenolic compounds in sea buckthorn (Hippophaë rhamnoides L.) plant parts during annual growth cycle and estimation of their antioxidant potential." Open Chemistry 12, no. 11 (2014): 1152–61. http://dx.doi.org/10.2478/s11532-014-0562-y.

Full text

Abstract:

AbstractPresented work summarizes the data about polyphenolic profiles in various plant parts (leaves, shoots, berries) of sea buckthorn (Hippophaë rhamnoides L.) during the annual growth cycle. A reversed-phase high performance liquid chromatography method (RP-HPLC) coupled with diode-array detection (DAD) was optimized for determination of catechin, epicatechin, gallic acid, p-coumaric acid, caffeic acid, ferulic acid, rutin (quercetin 3-rutinoside) and quercitrin (quercetin 3-rhamnoside). The content of these polyphenolic compounds was monitored in extracts of sea buckthorn plant samples fr

APA, Harvard, Vancouver, ISO, and other styles

12

Durán-Guerrero, Schwarz, Fernández-Recamales, Barroso, and Castro. "Characterization and Differentiation of Spanish Vinegars from Jerez and Condado de Huelva Protected Designations of Origin." Foods 8, no. 8 (2019): 341. http://dx.doi.org/10.3390/foods8080341.

Full text

Abstract:

Thirty one Jerez vinegar samples and 33 Huelva vinegar samples were analyzed for polyphenolic and volatile compound content in order to characterize them and attempt to differentiate them. Sixteen polyphenolic compounds were quantified by means of ultraperformance liquid chromatography method with diode array detection (UPLC–DAD), and 37 volatile compounds were studied by means of stir bar sorptive extraction–gas chromatography–mass spectrometry (SBSE–GC–MS). Spectrophotometric CIELab parameters were also measured for all the samples. The results obtained from the statistical multivariate trea

APA, Harvard, Vancouver, ISO, and other styles

13

Pawłowicz, Kamil, Dominika Ludowicz, Marta Karaźniewicz-Łada, Kamil Wdowiak, and Judyta Cielecka-Piontek. "Analysis of the Composition of Lyophilisates Obtained from Aloe arborescens Gel of Leaves of Different Ages from Controlled Crops." Molecules 26, no. 11 (2021): 3204. http://dx.doi.org/10.3390/molecules26113204.

Full text

Abstract:

The aim of the study is to evaluate the composition of lyophilisates obtained from Aloe arborescens leaf gel at the age of one to four years. The leaves were obtained from controlled crops, which allowed to exclude environmental factors as variables. It was confirmed that the lyophilisates obtained from different years of Aloe arborescens leaf gel varied in chromatographic analyses in terms of aloin A and aloenin A content (high-performance liquid chromatography with diode-array detection HPLC-DAD, high-performance liquid chromatography with tandem mass spectrometric detection HPLC-MS/MS). Sim

APA, Harvard, Vancouver, ISO, and other styles

14

Dabetić, Nevena, Vanja Todorović, Manuela Panić, Ivana Radojčić Redovniković, and Sladjana Šobajić. "Impact of Deep Eutectic Solvents on Extraction of Polyphenols from Grape Seeds and Skin." Applied Sciences 10, no. 14 (2020): 4830. http://dx.doi.org/10.3390/app10144830.

Full text

Abstract:

In the past few years, research efforts have focused on plant exploitation for deriving some valuable compounds. Extraction has been usually performed using petrochemical and volatile organic solvents, but nowadays, increased recognition of environmental pollution has prompted the utilization of green solvents as alternatives. Therefore, the aim of the present study was to exploit deep eutectic solvents (DES) (choline chloride: citric acid and choline chloride: glucose) as solvents for extracting valuable phenolic antioxidants from grapes. Investigation was conducted on ten grape varieties, ob

APA, Harvard, Vancouver, ISO, and other styles

15

Antognoni, Fabiana, Giulia Potente, Roberto Mandrioli, et al. "Fruit Quality Characterization of New Sweet Cherry Cultivars as a Good Source of Bioactive Phenolic Compounds with Antioxidant and Neuroprotective Potential." Antioxidants 9, no. 8 (2020): 677. http://dx.doi.org/10.3390/antiox9080677.

Full text

Abstract:

Sweet cherries (Prunus avium L.) are highly appreciated fruits for their taste, color, nutritional value, and beneficial health effects. In this work, seven new cultivars of sweet cherry were investigated for their main quality traits and nutraceutical value. The phytochemical profile of three classes of phenolic compounds and the antioxidant activity of the new cultivars were investigated through high-performance liquid chromatography with diode array detection (HPLC-DAD) and spectrophotometric assays, respectively, and compared with those of commonly commercialized cultivars. Cyanidine-3-O-r

APA, Harvard, Vancouver, ISO, and other styles

16

El-Kafrawy, Dina S., Tarek S. Belal, Mohamed S. Mahrous, Magdi M. Abdel-Khalek, and Amira H. Abo-Gharam. "Validated Spectrophotometric and RP-HPLC–DAD Methods for the Determination of Ursodeoxycholic Acid Based on Derivatization with 2-Nitrophenylhydrazine." Journal of AOAC INTERNATIONAL 100, no. 3 (2017): 677–85. http://dx.doi.org/10.5740/jaoacint.16-0286.

Full text

Abstract:

Abstract This work describes the development, validation, and application of two simple, accurate, and reliable methods for the determination of ursodeoxycholic acid (UDCA) in bulk powder and in pharmaceutical dosage forms. The carboxylic acid group in UDCA was exploited for the development of these novel methods. Method 1 is the colorimetric determination of the drug based on its reaction with 2-nitrophenylhydrazine hydrochloride in the presence of a water-soluble carbodiimide coupler [1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride] and pyridine to produce an acid hydrazide deri

APA, Harvard, Vancouver, ISO, and other styles

17

Baj, Jacek, Wojciech Flieger, Dominika Przygodzka, et al. "Application of HPLC-QQQ-MS/MS and New RP-HPLC-DAD System Utilizing the Chaotropic Effect for Determination of Nicotine and Its Major Metabolites Cotinine, and trans-3′-Hydroxycotinine in Human Plasma Samples." Molecules 27, no. 3 (2022): 682. http://dx.doi.org/10.3390/molecules27030682.

Full text

Abstract:

The routine techniques currently applied for the determination of nicotine and its major metabolites, cotinine, and trans-3′-hydroxycotinine, in biological fluids, include spectrophotometric, immunoassays, and chromatographic techniques. The aim of this study was to develop, and compare two new chromatographic methods high-performance liquid chromatography coupled to triple quadrupole mass spectrometry (HPLC-QQQ-MS/MS), and RP-HPLC enriched with chaotropic additives, which would allow reliable confirmation of tobacco smoke exposure in toxicological and epidemiological studies. The concentratio

APA, Harvard, Vancouver, ISO, and other styles

18

Tuzimski, Tomasz, and Tomasz Rejczak. "A QuEChERS-Based Sample Preparation Method for the Analysis of 5-Nitroimidazoles in Bovine Milk by HPLC–DAD." Journal of AOAC INTERNATIONAL 100, no. 6 (2017): 1671–80. http://dx.doi.org/10.5740/jaoacint.17-0213.

Full text

Abstract:

Abstract In this study, a simple, cost-effective, and sensitive HPLC diode-array detection method was developed for the simultaneous determination of six different 5-nitroimidazoles [metronidazole, 2-hydroxymethyl-1-methyl-5-nitro-1H-imidazole, dimetridazole (DMZ), ronidazole, ornidazole, and ipronidazole] in bovine milk samples. A QuEChERS-based sample preparation procedure was optimized by evaluating different cleanup sorbents, including zirconium-based sorbents (Z-Sep and Z-Sep+), C18, and primary–secondary amine (PSA), as well as EMR-Lipid cleanup solution. Acceptable analytical performanc

APA, Harvard, Vancouver, ISO, and other styles

19

Tran, Jonathan, Aaron C. Elkins, German C. Spangenberg, and Simone J. Rochfort. "High-Throughput Quantitation of Cannabinoids by Liquid Chromatography Triple-Quadrupole Mass Spectrometry." Molecules 27, no. 3 (2022): 742. http://dx.doi.org/10.3390/molecules27030742.

Full text

Abstract:

The high-throughput quantitation of cannabinoids is important for the cannabis industry. As medicinal products increase, and research into compounds that have pharmacological benefits increase, and the need to quantitate more than just the main cannabinoids becomes more important. This study aims to provide a rapid, high-throughput method for cannabinoid quantitation using a liquid chromatography triple-quadrupole mass spectrometer (LC-QQQ-MS) with an ultraviolet diode array detector (UV-DAD) for 16 cannabinoids: CBDVA, CBDV, CBDA, CBGA, CBG, CBD, THCV, THCVA, CBN, CBNA, THC, Δ8-THC, CBL, CBC,

APA, Harvard, Vancouver, ISO, and other styles

20

Gaballah, Mohamed S., Xin Li, Zijia Zhang, et al. "Determination of Tetracycline, Oxytetracycline, Sulfadiazine, Norfloxacin, and Enrofloxacin in Swine Manure Using a Coupled Method of On-Line Solid-Phase Extraction with the UHPLC–DAD." Antibiotics 10, no. 11 (2021): 1397. http://dx.doi.org/10.3390/antibiotics10111397.

Full text

Abstract:

The use of various veterinary antibiotics (VAs) in animal husbandry raises serious concerns about the development of antibiotic resistance. Antibiotics such as tetracycline, oxytetracycline, sulfadiazine, norfloxacin, and enrofloxacin are the most frequently used antimicrobial compounds in animal husbandry and generate large eco-toxicological effects; however, they are still difficult to determine in a complex matrix such as swine manure. This study has developed an effective method for detecting five VAs in swine manure using Ultra-High-Performance Liquid Chromatography–Diode Array Detector (

APA, Harvard, Vancouver, ISO, and other styles

21

Madej, Katarzyna, Aleksandra Chmiołek, Kamila Szlachta, and Wojciech Piekoszewski. "HPLC-DAD Analysis of Hemp Oil Supplements for Determination of Four Cannabinoids: Cannabidiol, Cannabidiolic Acid, Cannabinol and Delta 9-Tetrahydrocannabinol." Separations 8, no. 12 (2021): 227. http://dx.doi.org/10.3390/separations8120227.

Full text

Abstract:

Growing consumer interest in hemp oilseed supplements requires quality control. Therefore, appropriate, effective and verified analytical methods are needed for the determination of some bioactive cannabinoids in them. The aim of the study is to present an extended (compared to our previous research) validated high performance liquid chromatography with diode array detection (HPLC-DAD) method for the determination of four cannabinoids (cannabidiol, cannabidiolic acid, cannabinol and delta-9-tetrahydrocannabinol) in an oil matrix, which was used to determine these cannabinoids in seven commerci

APA, Harvard, Vancouver, ISO, and other styles

22

He, Li, Pang, et al. "A Beta/ZSM-22 Zeolites-Based-Mixed Matrix Solid-Phase Dispersion Method for the Simultaneous Extraction and Determination of Eight Compounds with Different Polarities in Viticis Fructus by High-Performance Liquid Chromatography." Molecules 24, no. 19 (2019): 3423. http://dx.doi.org/10.3390/molecules24193423.

Full text

Abstract:

Viticis Fructus (VF) was named Manjingzi as a commonly used traditional Chinese medicine (TCM) targeting various pains and inflammation for more than 2000 years. To guarantee the quality of Viticis Fructus, a simple, quick and eco-friendly Beta/ZSM-22 zeolites-based-mixed matrix solid-phase dispersion method (B/Z-MMSPD) was established for simultaneous extraction and determination of eight compounds (two phenolic acids, two iridoid glycosides, vanillin and three flavonoids) with different polarities from Viticis Fructus by high performance liquid chromatography coupled with a diode array detec

APA, Harvard, Vancouver, ISO, and other styles

23

Tuzimski, Tomasz, Tomasz Rejczak, Dominika Pieniążek, Grzegorz Buszewicz, and Grzegorz Teresiński. "Comparison of SPE/d-SPE and QuEChERS-Based Extraction Procedures in Terms of Fungicide Residue Analysis in Wine Samples by HPLC–DAD and LC-QqQ-MS." Journal of AOAC INTERNATIONAL 99, no. 6 (2016): 1436–43. http://dx.doi.org/10.5740/jaoacint.16-0277.

Full text

Abstract:

Abstract Two different extraction and clean-up protocols, based on either the SPE/dispersive SPE (d-SPE) or the quick, easy, cheap, effective, rugged, and safe approach, were optimized and compared for determination of six selected fungicides (benalaxyl, metalaxyl, triadimenol, tebuconazole, diniconazole, and epoxiconazole) in wine samples. The pilot study was performed by applying HPLC with diode-array detection, and optimized procedures were easily transferred to the LC triple-quadrupole MS system. Both extraction procedures presented good performance for all the analytes, with recoveries in

APA, Harvard, Vancouver, ISO, and other styles

24

Ide, Alessandra Honjo, and José Manuel Florêncio Nogueira. "Determination of Hydrophilic UV Filters in Real Matrices Using New-Generation Bar Adsorptive Microextraction Devices." Separations 6, no. 4 (2019): 45. http://dx.doi.org/10.3390/separations6040045.

Full text

Abstract:

In the present contribution, new-generation bar adsorptive microextraction devices combined with microliquid desorption, followed by high-performance liquid chromatography–diode array detection (BAµE-µLD/HPLC–DAD) are proposed for the determination of two very polar ultraviolet (UV) filters (2-phenylbenzimidazole-5-sulfonic acid (PBS) and 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid (BZ4)) in aqueous media. Different sorbents were evaluated as BAµE coating phases, in which polystyrene–divinylbenzene polymer showed the best selectivity for the analysis of both UV filters, with average extr

APA, Harvard, Vancouver, ISO, and other styles

25

Rico, Xiana, Beatriz Gullón, and Remedios Yáñez. "Environmentally Friendly Hydrothermal Processing of Melon by-Products for the Recovery of Bioactive Pectic-Oligosaccharides." Foods 9, no. 11 (2020): 1702. http://dx.doi.org/10.3390/foods9111702.

Full text

Abstract:

Melon by-products, that currently lack high value-added applications, could be a sustainable source of bioactive compounds such as polysaccharides and antioxidants. In this work, melon peels were extracted with water to remove free sugars, and the water-insoluble solids (WISs) were subjected to hydrothermal processing. The effect of temperature on the composition of the obtained liquors and their total phenolic content was evaluated. The selected liquors were also characterized by matrix assisted laser desorption/ionization-time of flight mass spectroscopy (MALDI-TOF MS), fourier transform inf

APA, Harvard, Vancouver, ISO, and other styles

26

Śliwka-Kaszyńska, Magdalena, Marek Ślebioda, Anna Brillowska-Dąbrowska, et al. "Multi-Technique Investigation of Grave Robes from 17th and 18th Century Crypts Using Combined Spectroscopic, Spectrometric Techniques, and New-Generation Sequencing." Materials 14, no. 13 (2021): 3535. http://dx.doi.org/10.3390/ma14133535.

Full text

Abstract:

The textile fragments of the funeral clothes found in the 17th and 18th century crypts were subjected to spectroscopic, spectrometric, and microbial investigation. The next-generation sequencing enabled DNA identification of microorganisms at the genus and in five cases to the species level. The soft hydrofluoric acid extraction method was optimized to isolate different classes of dyes from samples that had direct contact with human remains. High-performance liquid chromatography coupled with diode matrix and tandem mass spectrometry detectors with electrospray ionization (HPLC-DAD-ESI-MS/MS)

APA, Harvard, Vancouver, ISO, and other styles

27

Jornet-Martínez, Neus, Adrián Ortega-Sierra, Jorge Verdú-Andrés, Rosa Herráez-Hernández, and Pilar Campíns-Falcó. "Analysis of Contact Traces of Cannabis by In-Tube Solid-Phase Microextraction Coupled to Nanoliquid Chromatography." Molecules 23, no. 9 (2018): 2359. http://dx.doi.org/10.3390/molecules23092359.

Full text

Abstract:

Because of its inherent qualities, in-tube solid-phase microextraction (IT-SPME) coupled on-line to nanoliquid chromatography (nanoLC) can be a very powerful tool to address the new challenges of analytical laboratories such as the analysis of traces of complex samples. This is the case of the detection of contact traces of drugs, especially cannabis. The main difficulties encountered in the analysis of traces of cannabis plants on surfaces are the low amount of sample available (typically < 1 mg), the complexity of the matrix, and the low percentages of cannabinoic compounds in the samples

APA, Harvard, Vancouver, ISO, and other styles

28

Budisulistiorini, S. H., X. Li, S. T. Bairai, et al. "Examining the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol formation during the 2013 Southern Oxidant and Aerosol Study (SOAS) at the Look Rock, Tennessee, ground site." Atmospheric Chemistry and Physics Discussions 15, no. 5 (2015): 7365–417. http://dx.doi.org/10.5194/acpd-15-7365-2015.

Full text

Abstract:

Abstract. A suite of offline and real-time gas- and particle-phase measurements was deployed at Look Rock, Tennessee (TN), during the 2013 Southern Oxidant and Aerosol Study (SOAS) to examine the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol (SOA) formation. High- and low-time resolution PM2.5 samples were collected for analysis of known tracer compounds in isoprene-derived SOA by gas chromatography/electron ionization-mass spectrometry (GC/EI-MS) and ultra performance liquid chromatography/diode array detection-electrospray ionization-high-resolution quadrup

APA, Harvard, Vancouver, ISO, and other styles

29

Budisulistiorini, S. H., X. Li, S. T. Bairai, et al. "Examining the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol formation during the 2013 Southern Oxidant and Aerosol Study (SOAS) at the Look Rock, Tennessee ground site." Atmospheric Chemistry and Physics 15, no. 15 (2015): 8871–88. http://dx.doi.org/10.5194/acp-15-8871-2015.

Full text

Abstract:

Abstract. A suite of offline and real-time gas- and particle-phase measurements was deployed at Look Rock, Tennessee (TN), during the 2013 Southern Oxidant and Aerosol Study (SOAS) to examine the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol (SOA) formation. High- and low-time-resolution PM2.5 samples were collected for analysis of known tracer compounds in isoprene-derived SOA by gas chromatography/electron ionization-mass spectrometry (GC/EI-MS) and ultra performance liquid chromatography/diode array detection-electrospray ionization-high-resolution quadrup

APA, Harvard, Vancouver, ISO, and other styles

30

Nguyen, Phu Hoang. "Determination of cysteamine in animal feeds by high performance liquid chromatography with diode-array detection (HPLC-DAD)." Science and Technology Development Journal 21, no. 2 (2018). http://dx.doi.org/10.32508/stdj.v21i2.427.

Full text

Abstract:

A HPLC-DAD method for the determination of cysteamine supplementation in commercial animal feeds was developed. Samples were extracted with a mixture of 0.5 % hydrochloric acid – acetonitrile (90:10, v/v), matrix interferences were removed with a C18 cartridge, cysteamine was derivatized using 5,5'-dithiobis-(2-nitrobenzoic) acid (DTNB) as Ellman's reagent targeting to the thiol group in the molecule. Quantification of cysteamine was performed on a c18 column with DAD at 323 nm. The developed method had LOD of 1.1 mg/l, good linearity of the calibration curve (R2 ≥ 0.9998), high recoveries (&g

APA, Harvard, Vancouver, ISO, and other styles

31

Maurer, Hans H. "Position of chromatographic techniques in screening for detection of drugs or poisons in clinical and forensic toxicology and/or doping control." Clinical Chemistry and Laboratory Medicine (CCLM) 42, no. 11 (2004). http://dx.doi.org/10.1515/cclm.2004.250.

Full text

Abstract:

AbstractThis paper reviews chromatographic screening procedures for simultaneous detection of several drug classes relevant to clinical and forensic toxicology or doping control in urine or blood using gas chromatography-mass spectrometry (GC-MS), liquid chromatography coupled with a diode-array detector (LC-DAD) or a mass spectrometer (LC-MS). The pros and cons of the different techniques and procedures are discussed leading to the following conclusions and perspectives. GC-MS, especially in the electron ionization full-scan mode, is still the method of choice for comprehensive screening prov

APA, Harvard, Vancouver, ISO, and other styles

32

dos Reis, Marina, Fabiano Silva, Fernando Madureira, Eugênia Vargas, Lucas Oliveira, and Renata Lopes. "Development and Validation of a Method for Ionic Dyes Determination in Guava Fibrous Matrix Using Reverse Phase Chromatography." Journal of the Brazilian Chemical Society, 2021. http://dx.doi.org/10.21577/0103-5053.20210105.

Full text

Abstract:

In this work, a method for food dyes determination in fibrous fruit pulps was developed. The analytes Tartrazine, Twilight Yellow FCF, Erythrosine, Orange G and Allura Red were analyzed by reverse phase chromatography with diode array (DAD) detection. The sample preparation consisted of a simple procedure, based on initial pH adjustment of the sample (pH = 10.0), followed by an extraction with acetonitrile (5.0 mL and agitation for 30 s), ultrasonic (5 min) and centrifugation (4000 rpm, 20 ºC, for 20 min). The supernatant had its pH adjusted to 3.0, followed by filtration. The method was valid

APA, Harvard, Vancouver, ISO, and other styles

33

Fernández-Poyatos, María del Pilar, Antonio Ruiz-Medina, Carlos Salazar-Mendías, and Eulogio J. Llorent-Martínez. "Spectrophotometric determination of the antioxidant properties and characterization of the phenolic content by high-performance liquid chromatography–diode array detection–tandem mass spectrometry (HPLC–DAD–MS/MS) of Berberis hispanica Boiss. & Reut. leaves." Analytical Letters, June 8, 2020, 1–12. http://dx.doi.org/10.1080/00032719.2020.1775628.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!