Academic literature on the topic 'HPLC.DAD (High Performance Liquid Chromatograph-Diode Array Detector)'

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Journal articles on the topic "HPLC.DAD (High Performance Liquid Chromatograph-Diode Array Detector)"

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Tuzimski, Tomasz. "Determination of Pesticides in Water Samples from the Wieprz-Krzna Canal in the czysko-Wodawskie Lake District of Southeastern Poland by Thin-Layer Chromatography with Diode Array Scanning and High-Performance Column Liquid Chromatography with Diode Array Detection." Journal of AOAC INTERNATIONAL 91, no. 5 (2008): 1203–9. http://dx.doi.org/10.1093/jaoac/91.5.1203.

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Abstract High-performance thin-layer chromatography with diode array scanning (TLC-DAD) and high-performance column liquid chromatography with a diode array detector (HPLC-DAD) were used to screen water samples for pesticides. Atrazine, clofentezine, chlorfenvinphos, hexaflumuron, terbuthylazine, lenacyl, neburon, bitertanol, and metamitron were enriched from canal water samples by solid-phase extraction (SPE) on octadecyl silane (C18)/styrene-divinylbenzene-1, C18, C18 Polar Plus, and cyanopropyl (CN) cartridges. Recovery rates were high for all extraction materials except CN, for which values for all pesticides were lower. SPE was used for both preconcentration and fractionation of the analytes. Analytes were eluted by means of methanol and dichloromethane. Methanol eluates were analyzed by HPLC-DAD and dichloromethane eluates by TLC-DAD. The method was validated for precision, repeatability, and accuracy. Calibration graphs were linear between 0.1 and 50.0 g/mL for all pesticides, and correlation coefficient (r) values were between 0.9994 and 1.000 as determined by HPLC-DAD. Calibration graphs were linear between 0.1 and 1.5 g/spot for all pesticides, and r values were between 0.9899 and 0.9987 as determined by TLC-DAD. The limit of detection was between 0.04 and 0.23 g/spot for TLC-DAD and 0.02 and 0.45 g/mL for HPLC-DAD.
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Cebrián-Tarancón, Cristina, José Oliva, Miguel Ángel Cámara, Gonzalo L. Alonso, and M. Rosario Salinas. "Analysis of Intact Glycosidic Aroma Precursors in Grapes by High-Performance Liquid Chromatography with a Diode Array Detector." Foods 10, no. 1 (2021): 191. http://dx.doi.org/10.3390/foods10010191.

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Nowadays, the techniques for the analysis of glycosidic precursors in grapes involve changes in the glycoside structure or it is necessary the use of very expensive analytical techniques. In this study, we describe for the first time an approach to analyse intact glycosidic aroma precursors in grapes by high-performance liquid chromatography with a diode array detector (HPLC-DAD), a simple and cheap analytical technique that could be used in wineries. Briefly, the skin of Muscat of Alexandria grapes was extracted using a microwave and purified using solid-phase extraction combining Oasis MCX and LiChrolut EN cartridges. In total, 20 compounds were selected by HPLC-DAD at 195 nm and taking as a reference the spectrum of phenyl β-D-glucopyranoside, whose DAD spectrum showed a first shoulder from 190 to 230 nm and a second around 200–360 nm. After that, these glycosidic compounds were identified by High-performance liquid chromatography–quadrupole time-of-flight mass spectrometry (HPLC-qTOF-MS). Disaccharides hexose pentose were the most abundant group observed with respect to the sugars and monoterpendiols the main aglycones found.
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Yang, Fangliang, Guoxiang Sun, and Jiao Chen. "Development of a HPLC-DAD method combined with multicomponent chemometrics and antioxidant capacity to monitor the quality consistency of compound bismuth aluminate tablets by comprehensive quantified fingerprint method." Analytical Methods 9, no. 27 (2017): 4082–90. http://dx.doi.org/10.1039/c7ay00916j.

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A high performance liquid chromatography (HPLC) coupled with diode array detector method was developed to monitor the quality consistency of a classical compound preparation, compound bismuth aluminate tablet.
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Seo, Chang-Seob, and Kwang-Hoon Song. "Phytochemical Characterization for Quality Control of Phyllostachys pubescens Leaves Using High-Performance Liquid Chromatography Coupled with Diode Array Detector and Tandem Mass Detector." Plants 11, no. 1 (2021): 50. http://dx.doi.org/10.3390/plants11010050.

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Phyllostachys pubescens leaves are cultivated in a number of Asian countries and have been used for antipyretic and diuretic effects since ancient times, especially in Korea. The purpose of this study was to develop and validate of analytical method for quality control of P. pubescens leaves using high-performance liquid chromatography with diode array detector (HPLC–DAD) and liquid chromatography with tandem mass spectrometry (LC–MS/MS) detection. HPLC–DAD analysis was conducted with a Gemini C18 column, and distilled water–acetonitrile (both with 0.1% (v/v) formic acid) mobile-phase system. For the LC–MS/MS analysis, all markers were separated with a Waters ACQUITY UPLC BEH C18 column and gradient flow system of distilled water containing 0.1% (v/v) formic acid and 5 mM ammonium formate–acetonitrile. In both method, major components were detected at 2.13–11.63 mg/g (HPLC–DAD) and 0.12–19.20 mg/g (LC–MS/MS). These methods were validated with respect to linearity (coefficient of determination >0.99), recovery (95.22–118.81%), accuracy (90.52–116.96), and precision (<4.0%), and were successfully applied for the quantitative analysis of P. pubescens leaves.
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Wang, Hong Jun, Tie Zhong Zhou, Hong Jiang, et al. "The Establishment of the Fingerprint of Bangduling Oral Liquid by the High Performance Liquid Chromatography-Diode Array Detector." Advanced Materials Research 694-697 (May 2013): 1047–50. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.1047.

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Bangduling (BDL) oral liquid, which is a new research and development herbal preparation, comprises four traditional Chinese medicines (TCM): Radix Scutellariae, Cortex Phellodendri Chinensis, Folium Isatidis, and Radix et Rhizoma Rhei. A simple, reliable and reproducible method, based on a high performance liquid chromatography-diode array detector (HPLC-DAD) method, for establishing fingerprint of complex herbal medicine BDL oral liquid was described firstly. In order to develop and validate this HPLC-DAD method, Kromasil C18 column (S-5μm, 4.6 mm × 250 mm) was used with gradient mobile phase at the column temperature of 30°C. The mobile phase was consisted of methanol and water containing 0.1% phosphoric acid. UV wavelength was set at 254 nm. Ten batches of BDL preparations were used to establish the HPLC fingerprint. In addition, the contents of baicalin in the preparations were also determined. Validation of the analytic method was evaluated by stability, precision and repeatability test. Calibration curve for baicalin showed good linearity with R2 = 0.9992. The relative standard deviations (RSDs) value of the relative retention time and peak area in the stability, precision and repeatability test, were less than 1% and 5%, respectively. The similarity of 10 batches of BDL oral liquid was more than 0.958, which showed the preparations from different batch productions were consistent. This established determination method could be efficient to the quality control of BDL oral liquid.
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Narzullo, Saidov, Smelova Natalia, Garna Natalya, Koretnik Oksana, Khanina Nataliia та Gubar Svetlana. "Development of HPLC method for quantitative determination of new perspective APhI with anti-ulcer activity of trіаzоprazol". ScienceRise: Pharmaceutical Science, № 6(16) (28 грудня 2018): 41–46. https://doi.org/10.15587/2519-4852.2018.153387.

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<strong>Aim.</strong>&nbsp;Development of optimal, high-precision, reproducible method of quantitative determination of triazoprazole in substance using the method of high performance liquid chromatography. <strong>Materials and methods.</strong>&nbsp;Physico-chemical (high-performance liquid chromatography) and mathematical (statistical processing of results) methods of research were used to achieve this goal. Chromatography was performed on a liquid chromatograph Agilent 1290 Infinity II with diode-array (LC&nbsp;1290) detector and quadrupole-time-of-flight (QTOF 6530) mass analyzer. Fixed phase: chromatographic column 100&times;2.1 mm, filled with silica gel octadecylsilyl for chromatography Р Zorbax Eclipse Plus C18, with particle size 3,5 mkm. Mobile phase А: 0.1&nbsp;% formic acid solution S in water S. Mobile phase В: 0,1&nbsp;% formic acid solution S in acetonitrile S. Flow rate of the mobile phase: 0,6 ml/min. Temperature of the column: 30 &ordm;С. Volume of the injection: 5 mkl. Detector &ndash; diode-array (DAD). Detecting: by wavelength 248 nm. Detector settings (Q-TOF): type of ionization: positive, electrospray (+ ESI); metering mode: scanning ion with a mass from 100 to 1000 u.; voltage on the fragmentator 100 V; nitrogen temperature 350 С; nitrogen consumption 10 ml/min; nebulizer pressure 35 PSI; voltage on the capillary 4 Kv. The chromatographic separation was carried out with gradient elution on column filled with silica gel octadecylsilyl. <strong>Results</strong><strong>.</strong>&nbsp;Content of active ingredient in the substance of triazoprazole meets the requirements of regulated limits of quantitative content. Therefore, the proposed method can be used in the process of pharmaceutical development and standardization of the dosage form. Solvent and mobile phase do not interfere in conditions of the proposed method for determining the active substance. It testifies about specificity of the proposed method. <strong>Conclusions</strong><strong>.</strong>&nbsp;High-precision and reproducible method of quantitative determination of triazoprazole in substance using the method of high performance liquid chromatography was developed
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Zhu, Yanqin, Qinhong Yin, and Yaling Yang. "A comparative study of HPLC-DAD and UPLC-UV methods for simultaneous determination of 11 polyphenols in Moringa oleifera leaves." Tropical Journal of Pharmaceutical Research 20, no. 11 (2021): 2371–79. http://dx.doi.org/10.4314/tjpr.v20i11.20.

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Purpose: To develop, validate and compare two chromatographic methods - high performance liquid chromatography with diode array detector ((HPLC-DAD) and high performance liquid chromatography with ultraviolet detection (UPLC-UV) for the effective analysis of polyphenols in Moringa oleifera leaves.Methods: HPLC-DAD and UPLC-UV methods were applied for the accurate determination of eleven major polyphenols in Moringa oleifera leaves. The chromatographic conditions of the eleven polyphenols was determined on two C18 column by gradient elution with 0.5 % phosphoric acid solution -acetonitrile as the eluate, and at a flow rate of 1.0 and 0.5 mL/min for HPLC-DAD and UPLC-UV methods, respectively. Detector parameter of UPLC-UV was fixed at 203 nm. The assay methods were validated systematically.Results: The instrumental methods (HPLC-DAD and UPLC-UV) had good linearity, precision,repeatability and recovery. For both methods, quantification limits of UPLC-UV (0.057 - 0.363 μg/mL) were lower than those of UPLC-UV (0.094 - 1.532 μg/mL). The UPLC method with a shorter running time and more sensitive detection was applied in comparing to the HPLC method. After optimization and evaluation, the baseline of 11 compounds was separated effectively within 68 and 34 min, respectively.Conclusion: The developed HPLC-DAD and UPLC-UV assays were successfully utilized for thesimultaneous analysis of eleven major polyphenols and can readily be utilized as quality control tools for Moringa oleifera leaves in China, with UPLC-UV method showing better separation, lower organic solvent usage and shorter analytical period.
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Bittová, Miroslava, Dita Hladůvková, Vendula Roblová, Stanislav Kráčmar, Petr Kubáň, and Vlastimil Kubáň. "Analysis of Organic Acids, Deacetyl Asperulosidic Acid and Polyphenolic Compounds as a Potential Tool for Characterization of Noni (Morinda citrifolia) Products." Natural Product Communications 10, no. 11 (2015): 1934578X1501001. http://dx.doi.org/10.1177/1934578x1501001107.

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Organic acids, deacetyl asperulosidic acid (DAA) and polyphenolic compounds in various noni ( Morinda citrifolia L.) products (4 juices, 4 dry fruit powders and 2 capsules with dry fruit powder) were analyzed. Reversed-phase high-performance liquid chromatography (RP-HPLC) coupled with a variable wavelength detector (VWD) and electrospray ionization time-of-flight mass spectrometer (ESI-TOF MS) was applied for simultaneous analysis of organic acids (malic, lactic, citric and succinic acid) and DAA. An RP-HPLC method with diode-array detector (DAD) was developed for the analysis of polyphenolic compound content (rutin, catechin, quercitrin, kaempferol, gallic acid, caffeic acid and p-coumaric acid). The developed methods can contribute to better characterization of available noni products that is required from the consumers. In our study, we discovered significant dissimilarities in the content of DAA, citric acid and several phenolic compounds in some samples.
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Szewczyńska, Małgorzata, and Małgorzata Pośniak. "Doxorubicin hydrochloride. Determination in workplace air with high performance liquid chromatography." Podstawy i Metody Oceny Środowiska Pracy 34, no. 2(96) (2018): 115–31. http://dx.doi.org/10.5604/01.3001.0012.1025.

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This article presents a method for measuring doxorubicin hydrochloride in workplace air with HPLC with diode array detector (DAD). The method is based on adsorption inhalable fraction of doxorubicin hydrochloride aerosol on glass fiber filter, desperation with water, and chromatographic analysis. The analysis was performed in reverse phase (mobile phase – 0.05 mol/L hydrophosphate disodum and acetonitrile (65:35) with pH – 3 with 0.5 mL/L triethylamine) on C18 column. The measurement range was 0.06 – 1 μg/m3 for 4800-L air sample. The limit of detection (LOD) was 0,0005 μg/ml and the limit of quantification (LOQ) was 0,0015 μg /ml. The developed method of doxorubicin hydrochloride determination has been recorded as an analytical procedure (see appendix).
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Riley-Saldaña, Christian Anabí, María del Rocío Cruz-Ortega, Mariano Martínez Vázquez, Iván De-la-Cruz-Chacón, Marisol Castro-Moreno, and Alma Rosa González-Esquinca. "Acetogenins and alkaloids during the initial development of Annona muricata L. (Annonaceae)." Zeitschrift für Naturforschung C 72, no. 11-12 (2017): 497–506. http://dx.doi.org/10.1515/znc-2017-0060.

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AbstractIn plants, the presence and distribution of specialized metabolites during the early stages of development are not documented enough, even though their biosynthesis is one of the most important strategies for survival. In this study, five alkaloids and four acetogenins were detected inAnnona muricataL. during early development seedling, including three phases of root emergence and three of seedling formation. Hexane and alkaloid extracts were obtained from each organ, which were analyzed in a gas-mass chromatograph and in a high-performance liquid chromatograph coupled with a photodiode array UV detector (HPLC-DAD). This research shows the presence of the acetogeninscis-uvarimicin IV, mosinone, muricina B, andcis-annonacin-10-one, as well as of the alkaloids reticuline, coreximine, anonaine, asimilobine, and nornuciferine, both groups with a variable organ-specific distribution, related with the formation of organs and tissues.
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Dissertations / Theses on the topic "HPLC.DAD (High Performance Liquid Chromatograph-Diode Array Detector)"

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Lindholm, Johan. "Development and Validation of HPLC Methods for Analytical and Preparative Purposes." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4442.

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Book chapters on the topic "HPLC.DAD (High Performance Liquid Chromatograph-Diode Array Detector)"

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Carvalho, Daniel. "Optimization of an HPLC-DAD Method for Quercetin Detection." In ATHENA Research Book, Volume 2. University of Maribor, University Press, 2023. http://dx.doi.org/10.18690/um.4.2023.47.

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High-performance liquid chromatography (HPLC) is one of the most used liquid chromatographic techniques owing to its versatility that allows an optimal resolution. Quercetin (QUE), a polyphenol, has received increasing attention due to its antioxidant properties. Efforts have been made to overcome the traditional poor oral bioavailability of quercetin, requiring the development of analytical techniques for quercetin detection in different matrices. The main objective of this work was the optimization of a HPLC-Diode Array Detector (DAD) method for quercetin. An optimization process was conducted to guarantee the best conditions and results. Detection and quantification were executed with a reverse phase C-18 column. Different mobile phase (MP) compositions, flow rates, and wavelengths (with DAD) were studied. Better results were achieved with a MP composition of water:acetonitrile:methanol (55:40:5), with 1.5% acetic acid at a 1.3 mL/minute flow rate, with good results regarding chromatogram resolution, and quercetin quantification and detection.
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Conference papers on the topic "HPLC.DAD (High Performance Liquid Chromatograph-Diode Array Detector)"

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Nenadović, Milena, Katja Kržišnik, Polonca Trebše, and Mojca Bavcon Kralj. "Effect of Time, pH, Alcohol and Sugar Content on Nicotine Re-lease from Pouches Available on Slovene Market." In Socratic lectures 10. University of Lubljana Press, 2024. http://dx.doi.org/10.55295/psl.2024.ii7.

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Abstract: Tobacco-free nicotine pouches, first introduced in Sweden, are made as a less hazardous product for cigarette consumers. Instead of tobacco leaves, they consist of nicotine-containing powder and other ingredients such as water, salts, natural aromatic oils and others, that will boost the flavor and effect and make it last longer. This research aimed to investigate the extraction efficiency of nicotine from poaches of different brands. The effects of alcohol and sugars present in saliva at different pHs and consumption times were investigated as well. We optimized a High performance liquid chromatography with diode-array detection method (HPLC-DAD) for nicotine determination and its quantification. We used reversed-phase chromatography (RP-HPLC), and a mixture of sodium hydrogen carbonate and acetonitrile as a mobile phase (85:15, v/v). Different brands of nicotine pouches were used. Nicotine extraction rate showed positive linear dependence on time. The percentage of extraction was measured at different intervals, up to two hours, without getting a plateau. Nicotine extraction lowers with the increasing volume of saliva. The obtained results have shown that the increasing ethanol concentration in saliva (from 5-40 %) leads to a higher extraction rate, coming up to 85 %. In the case of sugar addition, the results were variable. Experiments with White fox pouches have shown that extraction of nicotine decreases with a higher concentration. On contrary, Siberia pouches do not exhibit that correlation. When it comes to pH, we used pH range that usually varies in saliva and the results have shown no significant differences. Keywords: Nicotine, Pouches, HPLC-DAD, Extraction
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Li, Lanqing, Zhenmin Zhang, Genyun Tang, and Bin Huang. "High Performance Liquid Chromatography-Diode Array Detection (HPLC-DAD) method for the determination of three components in the leaves of Stauntonia Brachyanthera from different regions." In International Conference on Agri-Photonics and Smart Agricultural Sensing Technologies (ICASAST 2022), edited by Jiandong Hu. SPIE, 2022. http://dx.doi.org/10.1117/12.2657097.

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Shim, Youn Young, Clara Olivia, Xian-Guo Zou, Young Jun Kim, and Martin Reaney. "Stability of Novel Peptides (linusorbs) in Flaxseed Meal Fortified Gluten-free Bread." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/mfmf5716.

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Flaxseed meal is rich in water-soluble gums and, as such, can improve texture in gluten-free products. Flaxseed bioactive-antioxidant peptides, linusorbs (LOs, a.k.a. cyclolinopeptides), are a class of molecules that may contribute health-promoting effects. The effects of dough preparation, baking, and storage on flaxseed-derived LOs stability in doughs and baked products are unknown. Gluten-free (GF) bread dough and bread were prepared with flaxseed meal and the LO content was determined in the flaxseed meal, bread flour containing the flaxseed meal, bread dough, and bread. The LO content during storage (0, 1, 2, and 4 weeks) at different temperatures (−18 °C, 4 °C, and 22−23 °C) was determined by high-performance liquid chromatography-diode array detection (HPLC-DAD). The content of oxidized LOs like [1–9-NαC],[1(Rs,Ss)-MetO]-linusorb B2 (LO14) were substantially constant in flaxseed meal and flour produced from flaxseed meal under all conditions for up to four weeks. However, during GF-bread production LOs decreased. Due to microbial contamination dough could not be stored at either 4 or 21°C, and bread could only be stored for one week at 21°C. Up to four weeks of storage was possible for bread and dough at −18 °C and bread at 4 °C without the loss of LOs. The LOs change during processing and storage. The concentration of reduced LOs in flour and meal were much higher than measured in dough and bread. There was not a corresponding increase in oxidized LOs. The LOs in flaxseed meal-fortified bread were stable for products stored at low temperatures to preserve LOs. This study is the first of the impact of baking conditions on LOs content and quality.
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