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Journal articles on the topic 'Alkaloids – Separation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Yatsimirsky, Anatoly K. "Host-Guest Chemistry of Alkaloids." Natural Product Communications 7, no. 3 (2012): 1934578X1200700. http://dx.doi.org/10.1177/1934578x1200700320.

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Binding of alkaloids by different hosts (native and modified cyclodextrins, cucurbiturils, calixarenes, and metal complexes of porphyrin and Salphen-type ligands), as well as receptor properties of alkaloid based hosts are reviewed. With alkaloids as guests, the largest binding constants and most significant spectral changes, in particular strong fluorescence enhancements induced by complexation with isoquinoline alkaloids, are observed with cucurbituril hosts. Cyclodextrins are successfully employed for improvement of solubility and for chiral separation of alkaloids of different types. Recep

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2

Petruczynik, Anna. "Analysis of alkaloids from different chemical groups by different liquid chromatography methods." Open Chemistry 10, no. 3 (2012): 802–35. http://dx.doi.org/10.2478/s11532-012-0037-y.

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AbstractAlkaloids are biologically active compounds widely used as pharmaceuticals and synthesised as secondary methabolites in plants. Many of these compounds are strongly toxic. Therefore, they are often subject of scientific interests and analysis. Since alkaloids — basic compounds appear in aqueous solutions as ionized and unionized forms, they are difficult for chromatographic separation for peak tailing, poor systems efficiency, poor separation and poor column-to-column reproducibility. For this reason it is necessity searching of more suitable chromatographic systems for analysis of the

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3

Slavík, Jiří, and Leonora Slavíková. "Quaternary Alkaloids from Thalictrum minus subsp. elatum (JACQ.) STOY. et STEFANOV." Collection of Czechoslovak Chemical Communications 57, no. 3 (1992): 573–78. http://dx.doi.org/10.1135/cccc19920573.

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Quaternary alkaloids berberine (chloride, 0.18%) and, after transformation into the iodides, magnoflorine (iodide, 1.06%), jatrorrhizine (iodide, 0.066%), thalphenine (iodide, 0.040%) and thalifendine (iodide, 0.021%) were isolated, after separation of the tertiary bases (0.38%) from the root of Thalictrum minus subsp. elatum (JACQ.) STOJ. et STEFANOV of Czechoslovak origin (1.8% alkaloid content). The aerial parts (0.013% alkaloids) in their quaternary fraction contain only negligible amounts of magnoflorine, berberine, and coptisine (which is the first time coptisine was found in the Thalict

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4

Kopp, Thomas, Liesa Salzer, Mona Abdel-Tawab, and Boris Mizaikoff. "Efficient Extraction of Pyrrolizidine Alkaloids from Plants by Pressurised Liquid Extraction – A Preliminary Study." Planta Medica 86, no. 01 (2019): 85–90. http://dx.doi.org/10.1055/a-1023-7419.

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AbstractPyrrolizidine alkaloids and their corresponding pyrrolizidine alkaloid-N-oxides are secondary plant constituents that became the subject of public concern due to their hepatotoxic, pneumotoxic, genotoxic, and cytotoxic effects. In contrast to the well-established analytical separation and detection methods, only a few studies have investigated the extraction of pyrrolizidine alkaloids/pyrrolizidine alkaloid-N-oxides from plant material. In this study, we have applied pressurized liquid extraction with the aim of evaluating the effect of various parameters on the recovery of pyrrolizidi

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5

AL-Khateeb, Iqbal Hasan. "A New Method for the Isolation and Purification of Trigonelline as Hydrochloride from Trigonella foenum-graecum L." Baghdad Science Journal 16, no. 3 (2019): 0550. http://dx.doi.org/10.21123/bsj.2019.16.3.0550.

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Separation of Trigonelline, the major alkaloid in fenugreek seeds, is difficult because the extract of these seeds usually contains Trigonelline, choline, mucilage, and steroidal saponins, in addition to some other substances. This study amis to isolate the quaternary ammonium alkaloid (Trigonelline) and choline from fenugreek seeds (Trigonella-foenum graecum L.) which have similar physiochemical properties by modifying of the classical method. Seeds were defatted and then extracted with methanol. The presence of alkaloids was detected by using Mayer's and Dragendorff's reagents. In this work,

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6

Correa, Diana Isabel, Edgar Pastene-Navarrete, Luis Bustamante, Marcelo Baeza, and Julio Alarcón-Enos. "Isolation of Three Lycorine Type Alkaloids from Rhodolirium speciosum (Herb.) Ravenna Using pH-Zone-Refinement Centrifugal Partition Chromatography and Their Acetylcholinesterase Inhibitory Activities." Metabolites 10, no. 8 (2020): 309. http://dx.doi.org/10.3390/metabo10080309.

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Preparative separation of three lycorine type alkaloids from Rhodolirum speciosum (Amaryllidaceae) was successfully carried out using pH-zone-refinement centrifugal partition chromatography (CPC) using the solvent system methyl-tert-butyl ether/acetonitrile/water (4:1:5, v/v/v) in descending mode. Using this system, Alkaloid 1 (165.7 mg, 88.2%, purity), 2 (60.1 mg, 97.7% purity) and 3 (12.3 mg, 84.4% purity) were obtained in one step. For structure elucidation, the pure alkaloids were subjected to spectroscopy analysis using nuclear magnetic resonance experiments (1H-NMR, 13C-NMR) and gas chro

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7

ZHANG, Mengting, Dandan GONG, Wanyang SUN, and Guoxiang SUN. "Separation of alkaloids using radial chromatography and its separation efficiency." Chinese Journal of Chromatography 36, no. 10 (2018): 1045. http://dx.doi.org/10.3724/sp.j.1123.2018.05016.

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8

Ma, Xiaoli, Hongwei Chen, Sisi Zhu, Pengfei Tu, and Yong Jiang. "Trimeric and Dimeric Carbazole Alkaloids from Murraya microphylla." Molecules 26, no. 18 (2021): 5689. http://dx.doi.org/10.3390/molecules26185689.

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Seventeen new carbazole alkaloid derivatives, including a trimeric carbazole racemate, (±)-microphyltrine A (1), 15 dimeric carbazole racemates, (±)-microphyldines A–O (2–16), and a C-6–C-3″-methyl-linked dimeric carbazole, microphyldine P (17), were isolated from the leaves and stems of Murraya microphylla (Merr. et Chun) Swingle. The structures of the new compounds were elucidated on the basis of HRESIMS and NMR data analysis. The optically pure isomers of these isolated carbazole alkaloids were obtained by chiral HPLC separation and their absolute configurations were determined by electroni

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9

Sivagnanam, Kumaran, Emy Komatsu, Susan Patrick, Christoph Rampitsch, Hélène Perreault, and Tom Gräfenhan. "Rapid Screening of Ergot Alkaloids in Sclerotia by MALDI-TOF Mass Spectrometry." Journal of AOAC INTERNATIONAL 99, no. 4 (2016): 895–98. http://dx.doi.org/10.5740/jaoacint.16-0117.

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Abstract Ergot is a common disease of wheat and other cereal grains that is predominantly caused by Claviceps purpurea in the field, often affecting crop yield in addition to the environment. Infected grain can be contaminated with dark sclerotia, which contain fungal metabolites such as ergot alkaloids. The occurrence of ergot alkaloids in cereal grain is a major health concern for humans and livestock. Effective and rapid screening of these mycotoxins is crucial for producers, processors, and consumers of cereal-based food and feed grain. Established methods of ergot alkaloid screening based

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10

Dymek, Aleksandra, Jarosław Widelski, Krzysztof Kamil Wojtanowski, Paulina Płoszaj, Rostyslav Zhuravchak, and Tomasz Mroczek. "Optimization of Pressurized Liquid Extraction of Lycopodiaceae Alkaloids Obtained from Two Lycopodium Species." Molecules 26, no. 6 (2021): 1626. http://dx.doi.org/10.3390/molecules26061626.

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Alkaloids of the Lycopodiaceae family are of great interest to researchers due to their numerous properties and wide applications in medicine. They play a very important role mainly due to their potent antioxidant, antidepressant effects and a reversible ability to inhibit acetylcholinesterase (AChE) enzyme activity. This property is of immense importance due to the growing problem of an increasing number of patients with neurodegenerative diseases in developed countries and a lack of effective and efficient treatment for them. Numerous studies have shown that Lycopodiaceae alkaloids are a ric

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11

Kiełczyński, R., and M. Bryjak. "Molecularly imprinted membranes for cinchona alkaloids separation." Separation and Purification Technology 41, no. 3 (2005): 231–35. http://dx.doi.org/10.1016/j.seppur.2004.03.021.

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12

Shen, Xiuwei, Jianshe Ma, Xianqin Wang, Congcong Wen, and Meiling Zhang. "Toxicokinetics of 11 Gelsemium Alkaloids in Rats by UPLC-MS/MS." BioMed Research International 2020 (July 15, 2020): 1–13. http://dx.doi.org/10.1155/2020/8247270.

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Gelsemium elegans (Gardn. & Champ.) Benth. is a plant belonging to the genus Gelsemium (family Gelsemiaceae), and its main components are alkaloids. It is a Chinese traditional medicinal plant and notoriously known as a highly toxic medicine. However, a method has not yet been found for the simultaneous detection of 11 Gelsemium alkaloids in rat plasma, and the toxicokinetics of 11 Gelsemium alkaloids after intravenous administration has not been reported. In this work, we have developed a sensitive and rapid method of ultraperformance liquid chromatography/tandem mass spectrometry (UPLC-M

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13

Wei, Xiaodong, Hongling Shen, Lijun Wang, Qingyan Meng, and Wenjie Liu. "Analyses of Total Alkaloid Extract ofCorydalis yanhusuoby Comprehensive RP × RP Liquid Chromatography with pH Difference." Journal of Analytical Methods in Chemistry 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/9752735.

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A comprehensive two-dimensional (2D) reverse phase (RP) liquid chromatography (LC) method is developed for alkaloid analysis. This offline comprehensive 2D method is developed using different pH values. With a pH value of 10.5, most alkaloids appear in the form of neutral molecules possessing high retention factors based on their polarity, while the alkaloid polarity order is changed when the pH value decreased to 3.0. The performance of pH modulated 2D LC is demonstrated with 8 alkaloid standards which resulted in orthogonal separation. The developed method is then applied to total alkaloid s

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14

Ryan, Suzanne M., Kathleen D. DeBoer, and John D. Hamill. "Alkaloid production and capacity for methyljasmonate induction by hairy roots of two species in Tribe Anthocercideae, family Solanaceae." Functional Plant Biology 42, no. 8 (2015): 792. http://dx.doi.org/10.1071/fp15045.

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In addition to producing medicinally important tropane alkaloids, some species in the mainly Australian Solanaceous tribe Anthocercideae, sister to genus Nicotiana, are known to also contain substantial levels of the pyridine alkaloids nicotine and nornicotine. Here, we demonstrate that axenic hairy root cultures of two tribe Anthocercideae species, Cyphanthera tasmanica Miers and Anthocercis ilicifolia ssp. ilicifolia Hook, contain considerable amounts of both nicotine and nornicotine (~0.5–1% DW), together with lower levels of the tropane alkaloid hyoscyamine (<0.2% DW). Treatment of grow

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15

Betz, Joseph M., Kevin D. White, and Ara H. Der Marderosian. "Gas Chromatographic Determination of Yohimbine in Commercial Yohimbe Products." Journal of AOAC INTERNATIONAL 78, no. 5 (1995): 1189–94. http://dx.doi.org/10.1093/jaoac/78.5.1189.

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Abstract The bark of Pausinystalia yohimbe [K. Schumann] Pierre (Rubiaceae), long valued as an aphrodisiac in West Africa, recently has been promoted in the United States as a dietary supplement alternative to anabolic steroids for enhancement of athletic performance. As the number of yohimbe products on the retail market increases, concerns about their safety are raised because of the reported toxicity of yohimbine (the major alkaloid of the plant). Although plant materials are usually identified microscopically, we were unable to identify them in many of the products, because as their labels

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16

Staniak, Wójciak-Kosior, Sowa, et al. "Applicability of a Monolithic Column for Separation of Isoquinoline Alkalodis from Chelidonium majus Extract." Molecules 24, no. 19 (2019): 3612. http://dx.doi.org/10.3390/molecules24193612.

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Isoquinoline alkaloids are the main group of secondary metabolites present in Chelidonium majus extracts, and they are still the object of interest of many researchers. Therefore, the development of methods for the investigation and separation of the alkaloids is still an important task. In this work, the application potential of a silica-based monolithic column for the separation of alkaloids was assessed. The influence of the organic modifier, temperature, salt concentration, and pH of the eluent on basic chromatographic parameters such as retention, resolution between neighboring peaks, chr

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17

Petruczynik, Anna, Justyna Misiurek, Tomasz Tuzimski, and Monika Waksmundzka-Hajnos. "Application of Mobile Phases Containing Ionic Liquid for HPLC Analysis of Selected Isoquinoline Alkaloids." Journal of AOAC INTERNATIONAL 100, no. 6 (2017): 1652–59. http://dx.doi.org/10.5740/jaoacint.17-0211.

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Abstract An HPLC procedure on a polar reversed-phase column with mobile phases containing ionic liquid (IL) was developed for the analysis of selected alkaloids from different chemical groups. We aimed to obtain optimal conditions for the separation of alkaloids because widely used silica-based stationary phases exhibit a silanol effect, rendering analysis of basic analytes extremely difficult. Retention, separation selectivity, peak symmetry, and system efficiency were examined in various eluent systems containing different concentrations of IL and acetonitrile. The obtained results revealed

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18

Hurlbut, Jeffrey A., Justin R. Carr, Emma R. Singleton, et al. "Solid-Phase Extraction Cleanup and Liquid Chromatography with Ultraviolet Detection of Ephedrine Alkaloids in Herbal Products." Journal of AOAC INTERNATIONAL 81, no. 6 (1998): 1121–27. http://dx.doi.org/10.1093/jaoac/81.6.1121.

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Abstract A solid-phase extraction (SPE) cleanup and a liquid chromatographic (LC) method with UV detection is presented for analysis of up to 7 ephedrine alkaloids in herbal products. Alkaloids from herbal products are extracted with acidified buffer, isolated on a propylsulfonic acid SPE column, eluted with a high-ionic-strength buffer, and separated by LC with detection at 255 nm. LC separation is performed by isocratic elution on a YMC phenyl column with 0.1 M sodium acetate-acetic acid (pH = 4.8) containing triethyl-amine and 2% acetonitrile. Ephedrine alkaloids are completely separated in

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19

Žorž, M., J. Culig, Z. Kopitar, D. Milivojevic, A. Marušič, and M. Bano. "HPLC Method for Determination of Ergot Alkaloids and Some Derivatives in Human Plasma." Human Toxicology 4, no. 6 (1985): 601–7. http://dx.doi.org/10.1177/096032718500400606.

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1 Ergot alkaloids and their dihydrogenated methanesulphonate (ms) salts were determined and measured in human plasma. 2 High-performance liquid chromatography (HPLC) with fluorometric detection was used for separation of ergot alkaloids in plasma. 3 Several ergot alkaloids and their derivatives, including lysergide (LSD), can be identified in cases of poisoning.

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20

Nie, Lirong, Xueting Feng, Hang Song, Zicheng Li, and Shun Yao. "A new integrated method of magnetic separation of isoquinoline alkaloids from Coptis chinensis based on their magnetized derivatives and key physical properties." New Journal of Chemistry 44, no. 17 (2020): 7105–15. http://dx.doi.org/10.1039/d0nj00731e.

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21

Szabó, Beata, Ágnes Lakatos, Tamás Kõszegi, György Kátay, and L. Botz. "Thin-Layer Chromatography-Densitometry and Liquid Chromatography Analysis of Alkaloids in Leaves of Papaver somniferum Under Stress Conditions." Journal of AOAC INTERNATIONAL 88, no. 5 (2005): 1571–78. http://dx.doi.org/10.1093/jaoac/88.5.1571.

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Abstract The effect of stress conditions on the concentrations of secondary metabolites were examined during various developmental stages of Papaver somniferum plants. P. somniferum plants were grown in laboratory conditions (Budakalász). The experiment consisted of 22 treatments. Significantly different alkaloid contents can be observed under different stress conditions. In general, the alkaloid contents of plants are very low; therefore, a highly sensitive and reliable method has to be developed for analysis. The amount of alkaloids was measured by 2 separation and detection techniques. Accu

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22

Chowdhury, B. K., S. K. Hirani, and P. Bhattacharyya. "High-performance liquid chromatographic separation of carbazole alkaloids." Journal of Chromatography A 369 (January 1986): 258–60. http://dx.doi.org/10.1016/s0021-9673(00)90129-8.

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23

Sun, Shao-Wen, Shoei-Sheng Lee, Li-Yun Chen, and Chien-Kuang Chen. "Separation of aporphine alkaloids by micellar electrokinetic chromatography." Journal of Chromatography A 767, no. 1-2 (1997): 277–84. http://dx.doi.org/10.1016/s0021-9673(96)01093-x.

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24

Táborská, Eva, Hana Bochořáková, Hana Paulová, and Jiří Dostál. "Separation of Alkaloids inChelidonium majusby Reversed Phase HPLC." Planta Medica 60, no. 04 (1994): 380–81. http://dx.doi.org/10.1055/s-2006-959508.

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25

Chowdhury, B. K., A. Mustapha, and P. Bhattacharyya. "Separation of carbazole alkaloids by gas-liquid chromatography." Journal of Chromatography A 329 (January 1985): 178–80. http://dx.doi.org/10.1016/s0021-9673(01)81913-0.

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26

Kuo, Ching-Hua, and Shao-Wen Sun. "Separation of bisbenzylisoquinoline alkaloids by micellar electrokinetic chromatography." Phytochemical Analysis 13, no. 2 (2002): 63–68. http://dx.doi.org/10.1002/pca.624.

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27

Hungerford, Natasha L., Steve J. Carter, Shalona R. Anuj, et al. "Analysis of Pyrrolizidine Alkaloids in Queensland Honey: Using Low Temperature Chromatography to Resolve Stereoisomers and Identify Botanical Sources by UHPLC-MS/MS." Toxins 11, no. 12 (2019): 726. http://dx.doi.org/10.3390/toxins11120726.

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Pyrrolizidine alkaloids (PAs) are a diverse group of plant secondary metabolites with known varied toxicity. Consumption of 1,2-unsaturated PAs has been linked to acute and chronic liver damage, carcinogenicity and death, in livestock and humans, making their presence in food of concern to food regulators in Australia and internationally. In this survey, honey samples sourced from markets and shops in Queensland (Australia), were analysed by high-resolution Orbitrap UHPLC-MS/MS for 30 common PAs. Relationships between the occurrence of pyrrolizidine alkaloids and the botanical origin of the ho

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28

Moldoveanu, SC. "Evaluation of Several Minor Alkaloid Levels in Tobacco with Separation of R- and S-Nornicotine." Beiträge zur Tabakforschung International/Contributions to Tobacco Research 25, no. 7 (2013): 649–59. http://dx.doi.org/10.2478/cttr-2013-0941.

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AbstractThe chiral separation of minor alkaloids from tobacco is of interest because R and S isomers of these compounds have differences in their physiological activity. This difference is also reflected in the physiological properties of tobaccospecificN’-nitrosamines (TSNAs), in particular that of N’-nitrosonornicotine. This compound results mainly from nornicotinenitrosation. The previously reported analytical techniques for the enantiomer separation of minor alkaloids have various shortcomings, such as the need for bidimensional chromatography or poor enantiomer separation. A new method fo

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29

Dostál, Jiří, and Milan Potáček. "Quaternary benzo[c]phenanthridine alkaloids." Collection of Czechoslovak Chemical Communications 55, no. 12 (1990): 2840–73. http://dx.doi.org/10.1135/cccc19902840.

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This review deals with the fully aromatic quaternary benzo[c]phenanthridine alkaloids in several aspects. Firstly nomenclature principles for numbering fused heterocycles are given. Then the richest botanical sources of quaternary benzo[c]phenanthridines are mentioned as well as isolation, separation and determination methods are presented. The emphasis of this survey is focused on chemical reactivity. The main pharmacological effects of quaternary benzo[c]phenanthridine alkaloids are discussed.

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30

Li, Wei-Xin, Huan Wang, and Ai-Wen Dong. "Systematic Separation and Purification of Alkaloids from Euchresta tubulosa Dunn. by Various Chromatographic Methods." Processes 7, no. 12 (2019): 924. http://dx.doi.org/10.3390/pr7120924.

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High-speed countercurrent chromatography (HSCCC) and silica gel column chromatography were used to separate and purify alkaloids from Chinese herbal medicine Euchresta tubulosa Dunn. The purpose of this study is to provide a system mode for rapid separation of alkaloids from natural products. In the experiment, the eluent of silica gel column chromatography was screened by thin layer chromatography (TLC) to obtain four components with different polarity. Then, the two-phase solvent systems of different components were selected and purified by HSCCC. Four alkaloids with relatively high content

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31

Sun, Changlei, Wei Zhao, Wenjuan Duan, et al. "Preparative separation of three isoquinoline alkaloids from Berberidis radix by pH-zone-refining countercurrent chromatography." Chemical Industry and Chemical Engineering Quarterly 24, no. 1 (2018): 1–7. http://dx.doi.org/10.2298/ciceq151220041s.

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Berberidis radix, as a traditional Chinese herbal medicine, is well known as the main source of berberine. This herbal medicine has been used for the treatment of many diseases and alkaloids including jatrorrhizine, palmatine, and berberine are major bioactive constituents. Few literatures report the preparative separation of these alkaloids from Berberidis radix. In the present study, the combinative application of ultrasonic extraction and pH-zone-refining countercurrent chromatography was used to extract and purify these alkaloids. The PZRCCC separation was performed in a two-phase solvent

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32

Chandler, Christopher M., Jeffrey W. Habig, Ashley A. Fisher, Katherine V. Ambrose, Susana T. Jiménez, and Owen M. McDougal. "Improved Extraction and Complete Mass Spectral Characterization of Steroidal Alkaloids from Veratrum Californicum." Natural Product Communications 8, no. 8 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800806.

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Four steroidal alkaloids extracted from the roots and rhizomes of Veratrum californicum were separated by high performance liquid chromatography (HPLC) and identified using high resolution electrospray ionization time of flight tandem mass spectrometry (ESI-TOF-MS/MS) as veratrosine, cycloposine, veratramine, and cyclopamine. This paper compares ethanol and benzene as extraction solvents, HPLC solvent conditions leading to good separation of steroidal alkaloids, and MS/MS fragmentation patterns for the four steroidal alkaloids which have been released to the public database MassBank.jp. The re

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Ingelse, Benno A., Jetse C. Reijenga, Mirko Flieger, and Frans M. Everaerts. "Capillary electrophoretic separation of herbicidal enantiomers applying ergot alkaloids." Journal of Chromatography A 791, no. 1-2 (1997): 339–42. http://dx.doi.org/10.1016/s0021-9673(97)00815-7.

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Nash, R. J., W. S. Goldstein, S. V. Evans, and L. E. Fellows. "Gas chromatographic method for separation of nine polyhydroxy alkaloids." Journal of Chromatography A 366 (January 1986): 431–34. http://dx.doi.org/10.1016/s0021-9673(01)93497-1.

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35

Weber, H. A., M. K. Zart, S. L. Ferguson, et al. "SEPARATION AND QUANTITATION OF ISOQUINOLINE ALKALOIDS OCCURRING IN GOLDENSEAL." Journal of Liquid Chromatography & Related Technologies 24, no. 1 (2001): 87–95. http://dx.doi.org/10.1081/jlc-100000329.

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36

Zuo, Jie, Xingyuan Zhang, Xinyu Li, et al. "Preparation of monoethyl fumarate-based molecularly imprinted polymers and their application as a solid-phase extraction sorbent for the separation of scopolamine from tropane alkaloids." RSC Advances 9, no. 34 (2019): 19712–19. http://dx.doi.org/10.1039/c9ra03542g.

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37

Gul, Rahman, Syed Umer Jan, Syed Faridullah, Samiullah Sherani, and Nusrat Jahan. "Preliminary Phytochemical Screening, Quantitative Analysis of Alkaloids, and Antioxidant Activity of Crude Plant Extracts from Ephedra intermedia Indigenous to Balochistan." Scientific World Journal 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/5873648.

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The aim of this study was to evaluate the antioxidant activity, screening the phytogenic chemical compounds, and to assess the alkaloids present in the E. intermedia to prove its uses in Pakistani folk medicines for the treatment of asthma and bronchitis. Antioxidant activity was analyzed by using 2,2-diphenyl-1-picryl-hydrazyl-hydrate assay. Standard methods were used for the identification of cardiac glycosides, phenolic compounds, flavonoids, anthraquinones, and alkaloids. High performance liquid chromatography (HPLC) was used for quantitative purpose of ephedrine alkaloids in E. intermedia

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38

Acevska, Jelena, Aneta Dimitrovska, Gjoshe Stefkov, Katerina Brezovska, Marija Karapandzova, and Svetlana Kulevanova. "Development and Validation of a Reversed-Phase HPLC Method for Determination of Alkaloids from Papaver somniferum L. (Papaveraceae)." Journal of AOAC INTERNATIONAL 95, no. 2 (2012): 399–405. http://dx.doi.org/10.5740/jaoacint.11-102.

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Abstract An HPLC method for the separation of six target alkaloids from Papaver somniferum L. (morphine, codeine, oripavine, thebaine, papaverine, and noscapine) was developed, optimized, and validated. The chromatographic behavior of these alkaloids was investigated using a reversed-phase chromatography at acidic and alkaline pH. The effects of ion-pairing agents, pH value of the mobile phase, concentration of the buffer components, mobile phase organic modifier, and column temperature were studied. Regardless of the large differences in their pKa values, all alkaloids were separated within a

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Johnson, Marimuthu alias Antonysamy, Janarthanan Gowtham, Narayanan Janakiraman, Tharmaraj Renisheya Joy Jeba Malar, Janaina E. Rocha, and Henrique D. M. Coutinho. "Phytochemical Profile of Asplenium aethiopicum (Burm. f.) Becherer Using HPTLC." Separations 7, no. 1 (2020): 8. http://dx.doi.org/10.3390/separations7010008.

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The present study was aimed to validate the phenolic, flavonoids, alkaloids and tannins profile of Aspleniuma ethiopicum (Burm. f.) Becherer methanolic extracts using HPTLC (High-performance thin-layer chromatography). The chromatographic separation was performed using the standard method. The separation methodology was optimized and phytoconstituents of A. aethiopicum methanolic extracts were separated. The methanolic extract of A. aethiopicum showed several bands identified as known phenolic compounds. The obtained flavonoids profiles were identified. HPTLC alkaloids profile of A. aethiopicu

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Sun, Changlei, Jia Li, Daijie Wang, Jinqian Yu, Xiao Wang, and Luqi Huang. "Preparative separation of alkaloids from Litsea cubeba using combined applications of pH-zone-refining and high-speed counter-current chromatography." RSC Advances 5, no. 92 (2015): 75831–37. http://dx.doi.org/10.1039/c5ra10564a.

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Blaney, B. J., R. Maryam, S.-A. Murray, and M. J. Ryley. "Alkaloids of the sorghum ergot pathogen (Claviceps africana): assay methods for grain and feed and variation between sclerotia/sphacelia." Australian Journal of Agricultural Research 54, no. 2 (2003): 167. http://dx.doi.org/10.1071/ar02095.

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Assay methods for the alkaloids of sorghum ergot (Claviceps africana) are described and compared. Sorghum ergot bodies (sclerotia/sphacelia) from various regions of Queensland and New South Wales were collected in 1997 and 2001 and assayed by spectrophotometry, thin layer chromatography, or high performance liquid chromatography (HPLC). All contained dihydroergosine (DHES) as the main alkaloid component (about 80%), with smaller amounts of dihydroelymoclavine and festuclavine. The preferred method of assay for infected sorghum and mixed feeds involved extraction into dichloromethane:methanol:e

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Papp, Elisabeth. "Fast separation of dihydro ergot alkaloids on an octylsilica column." Journal of Chromatography A 502 (January 1990): 241–42. http://dx.doi.org/10.1016/s0021-9673(01)89587-x.

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Waksmundzka‐Hajnos, Monika, Anna Petruczynik, and Gabriel Cieśla. "Temperature—the Tool in Separation of Alkaloids by RP‐HPLC." Journal of Liquid Chromatography & Related Technologies 30, no. 16 (2007): 2473–84. http://dx.doi.org/10.1080/10826070701465902.

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Srivastava, S. K., H. K. Desai, V. Vobalaboina, and S. W. Pelletier. "SEPARATION OF DITERPENOID ALKALOIDS BY HIGH PERFORMANCE CENTRIFUGAL PARTITION CHROMATOGRAPHY." Journal of Liquid Chromatography & Related Technologies 22, no. 11 (1999): 1687–97. http://dx.doi.org/10.1081/jlc-100101760.

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Válka, I., D. Walterová, M. Popova, V. Preininger, and V. Šimánek. "Separation and Quantification of Some Alkaloids fromFumaria parvifloraby Capillary Isotachophoresis." Planta Medica 51, no. 04 (1985): 319–22. http://dx.doi.org/10.1055/s-2007-969501.

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Ma, Ying, Yoichiro Ito, Edward Sokolosky, and Henry M. Fales. "Separation of alkaloids by pH-zone-refining counter-current chromatography." Journal of Chromatography A 685, no. 2 (1994): 259–62. http://dx.doi.org/10.1016/0021-9673(94)00667-9.

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Chowdhury, B. K., P. P. Rai, and P. Bhattacharyya. "Separation of carbazole alkaloids by two-dimensional thin-layer chromatography." Chromatographia 23, no. 3 (1987): 205–6. http://dx.doi.org/10.1007/bf02311481.

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Zhu, Heng, Daijie Wang, Lei Wen, et al. "Preparative separation of quaternary ammonium alkaloids from Caulis Mahoniae by conventional and pH-zone-refining counter-current chromatography." RSC Advances 6, no. 86 (2016): 83343–49. http://dx.doi.org/10.1039/c6ra14056d.

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Compared with the conventional HSCCC, PZRCCC is an efficient and rapid method for separation of quaternary ammonium alkaloids because of the high concentration of fractions and large sample loading capacity.

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Lee, Shoei-Sheng, Dong-Yi Wu, Sheng-Fa Tsai, and Chien-Kuang Chen. "Anti-Acetylcholinesterase Alkaloids from Annona glabra Leaf." Natural Product Communications 10, no. 6 (2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000625.

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Bioassay guided fractionation and separation of the EtOH extract of Annona glabra leaf against acetylcholinesterse led to the characterization of 15 alkaloids. Among them, (–)-actinodaphnine (2) and (–)-(6a S,7 R)-7-hydroxyactinodaphnine (9) are new aporphines, although (+)-2 and (±)-2 have been found in several plants. Their structures were established by spectroscopic analysis. (-)-Anolobine (5) and (-)-roemeroline (8) showed moderate inhibitory activity against eel acetylcholinesterase with IC50 values of 22.4 and 26.3 μM, respectively.

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Zalkow, Leon H., Clarita F. Asibal, Jan A. Glinski, et al. "Macrocyclic Pyrrolizidine Alkaloids from Senecio anonymus. Separation of a Complex Alkaloid Extract Using Droplet Counter-Current Chromatography." Journal of Natural Products 51, no. 4 (1988): 690–702. http://dx.doi.org/10.1021/np50058a005.

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