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Journal articles on the topic 'Chromatographically'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Akash, S. Ingale1* Rushikesh J. Lohar2 Sunita G. Maharaj2 Girish N. Patil2 Prashant B. More2 Devendra D. Talele3 Makrand R. Patil1 Rahulsingh U. Khairnar1 Vishwas S. More1. "HPLC Analysis And Isolation Of Rutin From Stem Bark Of Ginkgo Biloba L." International Journal in Pharmaceutical Sciences 2, no. 9 (2024): 1230–35. https://doi.org/10.5281/zenodo.13834350.

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Ginkgo biloba L., a plant belongs to the Ginkgoaceae is characterized by a very wide spectrum of various plant constituents. Rutin is that the major flavonoid glycoside found in gingko is that the rhamno glucoside of the flavonoid quercetin has been referred to as vitamin P or the porousness issue. Many studies had been done for the isolation of rutin by completely different chromatographically methodology. During this study rutin was isolated from ginkgo bilobo by precipitation and fractional solubilizations while not the utilization of any chromatographical technique. The isolated rutin was

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2

Mash, Eugene A. "Stereocontrolled Manipulations of Chromatographically Resolved Pyranosides." Synlett 1991, no. 08 (1991): 529–38. http://dx.doi.org/10.1055/s-1991-20789.

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3

Krupčík, J., J. Mydlová, I. Špánik, B. Tienpont, and P. Sandra. "Computerized separation of chromatographically unresolved peaks." Journal of Chromatography A 1084, no. 1-2 (2005): 80–89. http://dx.doi.org/10.1016/j.chroma.2004.09.073.

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4

Gulyas, H., M. Reich, and I. Sekoulov. "Characterization of a Biologically Treated Wastewater from Oil Reclaiming: Recording of Low Molecular Weight Organics and Estimation of Humic Substances." Water Science and Technology 29, no. 9 (1994): 195–98. http://dx.doi.org/10.2166/wst.1994.0478.

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Wastewater originating from oil reclaiming (COD about 300 mg/l, TOC about 70 mg/l) which was pretreated by equalization, neutralization, adsorption to activated sludge from a publicly owned treatment work, flocculation, and flotation and finally oxidized in an activated sludge process was analyzed for humic acids and gas chromatographically detectable organic compounds. The humic acid concentration was estimated to represent about 15% of the COD. Hydrocarbons were detected in activated sludge, but no hydrocarbons were identified gas chromatographically. In the two analyzed wastewater samples e

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5

Geffe, Mario, Lars Andernach, Oliver Trapp, and Till Opatz. "Chromatographically separable rotamers of an unhindered amide." Beilstein Journal of Organic Chemistry 10 (March 21, 2014): 701–6. http://dx.doi.org/10.3762/bjoc.10.63.

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Surprisingly stable formamide rotamers were encountered in the tetrahydroisoquinoline and morphinan series of alkaloids. We investigated the hindered rotation around the amide bond by dynamic high-performance liquid chromatography (DHPLC) and kinetic measurements of the interconversion of the rotamers which can readily be separated by HPLC as well as TLC. The experimental results of the different methods were compared to each other as well as to results obtained by DFT calculations.

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6

Hellgeth, J. W., and L. T. Taylor. "FTIR Detection of Liquid Chromatographically Separated Species." Journal of Chromatographic Science 24, no. 11 (1986): 519–28. http://dx.doi.org/10.1093/chromsci/24.11.519.

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7

Naiker, Mani. "β-Damascenone-yielding precursor(s) from Cabernet Sauvignon grapes". South Pacific Journal of Natural and Applied Sciences 19, № 1 (2001): 11. http://dx.doi.org/10.1071/sp01003.

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β-Damascenone, a potent aroma component of in a variety of grapes and wines, has a sensory threshold of approximately 2ng/L in water. This C13 norisoprenoid ketone is principally generated from hydrolyzable precursors, which was glycosidically bound. Isolation of β-damascenone-yielding precursors from Cabernet Sauvignon grape skins using C18 reversed phase chromatography followed by droplet countercurrent chromatography yielded multiple chromatographically distinguishable precursor fractions. The existence of multiple precursors was further evident from the varying ratios of 3-hydroxy- β-damas

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8

Mauk, Marcia R., Federico I. Rosell, and A. Grant Mauk. "Chromatographically Distinguishable Heme Insertion Isoforms of Human Hemopexin†." Biochemistry 46, no. 51 (2007): 15033–41. http://dx.doi.org/10.1021/bi701821a.

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9

MASH, E. A. "ChemInform Abstract: Stereocontrolled Manipulations of Chromatographically Resolved Pyranosides." ChemInform 23, no. 10 (2010): no. http://dx.doi.org/10.1002/chin.199210332.

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10

Mohamed, Tarik A., Mohamed H. Abd El-Razek, Ibrahim A. Saleh, et al. "Artemisia herba-alba sesquiterpenes: in silico inhibition in the ATP-binding pocket." RSC Advances 13, no. 28 (2023): 19530–39. http://dx.doi.org/10.1039/d3ra02690f.

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11

Lassfolk, Robert, Atte Aho, Dmitry Yu Murzin, and Reko Leino. "Hydrogenation of crude and purified d-glucosone generated by enzymatic oxidation of d-glucose." RSC Advances 10, no. 51 (2020): 30476–80. http://dx.doi.org/10.1039/d0ra05512c.

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12

Alalwiat, Ahlam, Sarah E. Grieshaber, Bradford A. Paik, Kristi L. Kiick, Xinqiao Jia, and Chrys Wesdemiotis. "Top-down mass spectrometry of hybrid materials with hydrophobic peptide and hydrophilic or hydrophobic polymer blocks." Analyst 140, no. 22 (2015): 7550–64. http://dx.doi.org/10.1039/c5an01600b.

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13

Stucki, Martin, Radmila Moudry, Christoph Kempf, Adames Omar, Andreas Schlegel, and Peter G. Lerch. "Characterisation of a chromatographically produced anti-D immunoglobulin product." Journal of Chromatography B: Biomedical Sciences and Applications 700, no. 1-2 (1997): 241–48. http://dx.doi.org/10.1016/s0378-4347(97)00319-8.

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14

Arora, Ashoni, Larry Moeller, and James Froeschle. "Safety and Immunogenicity of a New Chromatographically Purified Rabies." Journal of Travel Medicine 11, no. 4 (2006): 195–200. http://dx.doi.org/10.2310/7060.2004.19001.

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15

Messner, Christoph B., Oliver M. D. Lutz, Matthias Rainer, et al. "Structure and Dynamics of Chromatographically Relevant Fe(III)-Chelates." Journal of Physical Chemistry B 118, no. 42 (2014): 12232–38. http://dx.doi.org/10.1021/jp505193y.

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16

Vecsernye´s, Miklo´s, Istva´n Jo´ja´rt, Julianna Jo´ja´rt, Ferenc Laczi, and Ferenc A. La´szlo´. "Presence of chromatographically identified oxytocin in human sensory ganglia." Brain Research 414, no. 1 (1987): 153–54. http://dx.doi.org/10.1016/0006-8993(87)91337-0.

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17

Chand, Satish, and Martin G. Banwell. "Biomimetic Preparation of the Racemic Modifications of the Stilbenolignan Aiphanol and Three Congeners." Australian Journal of Chemistry 60, no. 4 (2007): 243. http://dx.doi.org/10.1071/ch07044.

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A chromatographically separable mixture of the racemic modification, (±)-1, of the stilbenolignan (–)-aiphanol and congeners (±)-2–4 has been generated by a silver(I)-mediated and potentially biomimetic oxidative coupling of piceatannol (5) with sinapic alcohol (6).

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18

Chen, Si, Yongchun Xu, Yu Tang, et al. "Pretreatment by recyclable Fe3O4@Mg/Al-CO3-LDH magnetic nano-adsorbent to dephosphorize for the determination of trace F− and Cl− in phosphorus-rich solutions." RSC Advances 10, no. 72 (2020): 44361–72. http://dx.doi.org/10.1039/d0ra07761e.

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Synthesized recyclable Fe<sub>3</sub>O<sub>4</sub>@Mg/Al-CO<sub>3</sub>-LDH magnetic nano-adsorbent is utilized to dephosphorize phosphorous-rich solutions but leave F<sup>−</sup> and Cl<sup>−</sup> to be detected chromatographically.

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19

Kitney, Stuart P., Seyed M. Sajedin, Vincent Rocher, Fei Cheng, and Stephen M. Kelly. "Silicon diimide gel as an efficient stationary phase in thin layer chromatography for acid-sensitive organic compounds." Chem. Commun. 53, no. 80 (2017): 11080–82. http://dx.doi.org/10.1039/c7cc04952h.

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Mesoporous silicon diimide gel (Si(NH)<sub>2</sub>)<sub>n</sub> is a suitable, efficient, and stable stationary phase for thin layer chromatography, that has the capacity to separate organic compounds chromatographically without decomposing acid-sensitive functions or bonds.

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20

Terrab, Abdel, Dan Pawlak, Pat Spaay, Debra Hoppensteadt, and Jawed Fareed. "Further Removal of Factor V Related Antigen From Bovine Thrombin by Utilizing a Membrane-Filtration Step." Clinical and Applied Thrombosis/Hemostasis 14, no. 2 (2008): 135–40. http://dx.doi.org/10.1177/1076029607308866.

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Topical bovine thrombin is commonly used during surgery to maintain hemostasis and is rarely associated with abnormalities in hemostasis, including coagulopathies and bleeding. Coagulopathies may be related to the formation of cross-reactive antibodies to bovine factor V. Effectiveness of a new filtration step to remove factor V/Va from bovine thrombin was evaluated. A highly sensitive and specific Western blot capable of detecting minute amounts of factor V/Va and/or its fragments was developed. Samples were evaluated for bovine factor V related antigens using the Western blot method and a co

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21

Ong, Shaowei, Hanlan Liu, Xiaoxing Qiu, Ganapati Bhat, and Charles Pidgeon. "Membrane Partition Coefficients Chromatographically Measured Using Immobilized Artificial Membrane Surfaces." Analytical Chemistry 67, no. 4 (1995): 755–62. http://dx.doi.org/10.1021/ac00100a011.

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22

Jokipii, A. M. M., K. Kiviranta, and L. Jokipii. "Gas chromatographically quantitated lactate in empyema and other pleural effusions." European Journal of Clinical Microbiology 6, no. 6 (1987): 731–33. http://dx.doi.org/10.1007/bf02013087.

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23

Moiseenkov, Alexander M., and Boris A. Czeskis. "Synthesis of some monoterpenols via cyclopropylcarbinyl rearrangement." Collection of Czechoslovak Chemical Communications 51, no. 6 (1986): 1316–22. http://dx.doi.org/10.1135/cccc19861316.

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Condensation of appropriately substituted aldehydes and Grignard reagents leads to cyclopropyl alcohols V - VIII chromatographically separated in all cases into individual diastereoisomers. Perchloric acid catalyzed cyclopropylcarbinyl rearrangement of V - VIII (as a mixture of diastereoisomers or individual isomers) gives unsaturated monoterpenols IX - XII with high regio- and stereospecifity.

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24

Xia, Jinmei, Wenhai Xiao, Xihuang Lin, et al. "Ion Mobility-Derived Collision Cross-Sections Add Extra Capability in Distinguishing Isomers and Compounds with Similar Retention Times: The Case of Aphidicolanes." Marine Drugs 20, no. 9 (2022): 541. http://dx.doi.org/10.3390/md20090541.

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The hyphenation of ion mobility spectrometry with high-resolution mass spectrometry has been widely used in the characterization of various metabolites. Nevertheless, such a powerful tool remains largely unexplored in natural products research, possibly mainly due to the lack of available compounds. To evaluate the ability of collision cross-sections (CCSs) in characterizing compounds, especially isomeric natural products, here we measured and compared the traveling-wave IMS-derived nitrogen CCS values for 75 marine-derived aphidicolanes. We established a CCS database for these compounds which

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25

Butler, V. P., J. F. Morris, T. Akizawa, et al. "Heterogeneity and lability of endogenous digitalis-like substances in the plasma of the toad, Bufo marinus." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 271, no. 2 (1996): R325—R332. http://dx.doi.org/10.1152/ajpregu.1996.271.2.r325.

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Three major groups of endogenous digitalis-like substances (EDLS) have been identified in the plasma of the toad, Bufo marinus. One group of compounds, present in fresh plasma, is composed of chromatographically homogeneous polar conjugates, principally bufadienolide 3-sulfates, which exhibit relatively weak Na(+)-K(+)-adenosinetriphosphatase (ATPase) inhibitory activity. A second and larger group of compounds, also found in fresh plasma, includes chromatographically heterogeneous conjugates, which are effective inhibitors of Na(+)-K(+)-ATPase; these compounds possess properties similar to tho

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26

Addy, M. E. "Several Chromatographically Distinct Fractions of Desmodium adscendens Inhibit Smooth Muscle Contractions." International Journal of Crude Drug Research 27, no. 2 (1989): 81–91. http://dx.doi.org/10.3109/13880208909053942.

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27

Vinci, John C., and Luis A. Colón. "Surface chemical composition of chromatographically fractionated graphite nanofiber-derived carbon dots." Microchemical Journal 110 (September 2013): 660–64. http://dx.doi.org/10.1016/j.microc.2013.08.002.

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28

Dravid, Vinayak P., Shengzhong Liu, and Manfred M. Kappes. "Transmission electron microscopy of chromatographically purified solid state C60 and C70." Chemical Physics Letters 185, no. 1-2 (1991): 75–81. http://dx.doi.org/10.1016/0009-2614(91)80143-l.

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29

MacKenzie, Ian Z., Johann Bichler, Gerald C. Mason, et al. "Efficacy and safety of a new, chromatographically purified rhesus (D) immunoglobulin." European Journal of Obstetrics & Gynecology and Reproductive Biology 117, no. 2 (2004): 154–61. http://dx.doi.org/10.1016/j.ejogrb.2004.03.009.

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30

Mayekar, Narayan V., Sandip K. Nayak, and Subrata Chattopadhyay. "TiCl3 as a New Catalyst for the Imino Diels-Alder Reaction." Natural Product Communications 1, no. 9 (2006): 1934578X0600100. http://dx.doi.org/10.1177/1934578x0600100913.

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Titanium(III) chloride was found to be an effective catalyst for the imino Diels-Alder reaction between an imine (generated in situ) and an activated alkene in acetonitrile at ambient temperature. The reaction proceeds smoothly to afford the corresponding adduct as a mixture of chromatographically separable cis- and trans isomers in moderate to good yields.

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31

Tilley, Leann, and GB Ralston. "Effect of Erythrocyte Spectrin on Actin Self-Association." Australian Journal of Biological Sciences 40, no. 1 (1987): 27. http://dx.doi.org/10.1071/bi9870027.

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The polymerization of pyrene-labelled skeletal muscle actin has been monitored in the presence of chromatographically purified spectrin dimers and tetramers. A small but consistent effect of spectrin binding on the critical concentration was observed for actin polymerized in the presence of 1 mM MgCI2. These data were analysed using the principle of linked functions.

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32

Smolarz, Helena D., and Tadeusz Krzaczek. "Phytochemical studies of the herb, Tragopogon orientalis L. (Asteraceae). 2. Components of a methanol extract." Acta Societatis Botanicorum Poloniae 57, no. 1 (2014): 93–105. http://dx.doi.org/10.5586/asbp.1988.009.

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Vitexin, orientin, isoorientin, luteolin and apigenin were isolated from the herb, <em>Tragopogon orientnlis</em> L. The occurrence of quercetin and the phenolic acids: chlorogenic, homoprotoca-techuic, protocatechuic, caffeic, gentysic, p-hydroxybenzoic, m-hydroxybenzoic o-hydroxyphenylacetic, p-hydroxyphenylacetic, p-cumaric, syringic, vanillic, ferulic and salicylic, and of the sugars: glucose, fructose and sucrose was demonstrated chromatographically.

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33

McCurdy, Teresa R., Varsha Bhakta, Louise J. Eltringham-Smith, Sharon Gataiance, Alison E. Fox-Robichaud, and William P. Sheffield. "Comparison of Methods for the Purification of Alpha-1 Acid Glycoprotein from Human Plasma." Journal of Biomedicine and Biotechnology 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/578207.

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Alpha-1 acid glycoprotein (AGP) is a highly glycosylated, negatively charged plasma protein suggested to have anti-inflammatory and/or immunomodulatory activities. Purification of AGP could be simplified if methods that exploit its high solubility under chemically harsh conditions could be demonstrated to leave the protein in its native conformation. Procedures involving exposure of AGP to hot phenol or sulphosalicylic acid (SSA) were compared to solely chromatographic methods. Hot phenol-purified AGP was more rapidly cleared from mice in vivo following intravenous injection than chromatograph

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34

Dräger, Marius, and Amit Basu. "Galactan synthesis in a single step via oligomerization of monosaccharides." Beilstein Journal of Organic Chemistry 10 (November 13, 2014): 2658–63. http://dx.doi.org/10.3762/bjoc.10.279.

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Galactans ranging in length from one to five residues were prepared in a single step by treatment of the glycosyl donor 2,3,4-tri-O-benzoyl-β-D-galactopyranosyl fluoride with lanthanum perchlorate in the presence of an initiator alcohol. The product oligosaccharides were readily chromatographically separable. This oligomerization was used to synthesize a pentagalactan in a single step from monosaccharide building blocks in reasonable overall yields.

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35

Mamaghani, Manouchehr, and Alireza Alizadehnia. "Enzyme Catalysed Kinetic Resolution of Racemic Methyl 3-acethylbicyclo [2.2.1] hept-5-ene-2-carboxylate using pig's liver esterase†." Journal of Chemical Research 2002, no. 8 (2002): 386–87. http://dx.doi.org/10.3184/030823402103172400.

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Racemic methyl 3- endo-acetylbicyclo[2.2.1]hept-5-ene-2- exo-carboxylate and methyl 3- exo-acetylbicyclo[2.2.1]hept-5-ene-2- endo-carboxylate were prepared (as a 1:1 mixture in 98% yield) from (E)-methyl 4- oxo-2-pentenoate, using Diels–Alder methodology. The mixture was separated chromatographically and resolved into the enantiomers by pig liver esterase (PLE) with low to high ee's (98%).

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36

Mollin, Jiří, Jitka Dopitová, and Oldřiška Staňková. "Tautomerization of acetylacetone and relation of the tautomerization constant to other equilibrium parameters." Collection of Czechoslovak Chemical Communications 52, no. 12 (1987): 2850–58. http://dx.doi.org/10.1135/cccc19872850.

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The relative partial pressures of acetylacetone above mixed aqueous-organic solutions were measured chromatographically and the Gibbs energies of acetylacetone transfer from water to the mixed solvents were determined and separated into contributions from the keto and enol forms. The tautomerization equilibrium was related to other thermodynamic equilibria and the Gibbs energy of transfer of the keto form was correlated with that of acetone.

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37

Djinovic, Vesna, and Tibor Sabo. "Preparation and characterization of facial and meridional isomers of uns-cis-(ethylenediamine-N, N'-di-3-propionato)(S-arginine)cobalt(III) chloride dihydrate." Journal of the Serbian Chemical Society 67, no. 5 (2002): 367–72. http://dx.doi.org/10.2298/jsc0205367d.

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Both theoretically possible geometrical isomers, facial and meridional, of uns-cis-(ethylenediamine-N,N?-di-3-propionato)(S-arginine)cobalt(III) chloride dihydrate were prepared by the reaction of sodium uns-cis-(ethylenediamine-N,N?-di-3-propionato)( carbonato)cobaltate(III) with S-arginine at 75 ?C. The complexes were isolated chromatographically and characterized by elemental analysis as well as electron absorption and infrared spectroscopy.

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38

Moffett, R. Bruce. "Angiotensinogen in Cerebrospinal Fluid Corresponds Chromatographically to the ?-Form of Plasma Angiotensinogen." Journal of Neurochemistry 49, no. 3 (1987): 841–45. http://dx.doi.org/10.1111/j.1471-4159.1987.tb00970.x.

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39

Pirkle, William H., and Daniel S. Reno. "Extension of chromatographically-derived molecular recognition concepts to first order asymmetric transformations." Journal of the American Chemical Society 109, no. 23 (1987): 7189–90. http://dx.doi.org/10.1021/ja00257a047.

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40

Herzig, Christian M., Wilhelm Schoeppe, and Jürgen E. Scherberich. "Angiotensinase A (aminopeptidase A): properties of chromatographically purified isoforms from human kidney." Journal of Chromatography A 625, no. 1 (1992): 73–82. http://dx.doi.org/10.1016/0021-9673(92)87223-u.

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41

Pantoja, C. V., B. C. Norris, and C. M. Contreras. "Diuretic and natriuretic effects of chromatographically purified fraction of garlic (Allium sativum)." Journal of Ethnopharmacology 52, no. 2 (1996): 101–5. http://dx.doi.org/10.1016/0378-8741(96)01396-7.

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42

Davis, Anthony P., and Patrick J. Gallagher. "1,1,3,3-Tetraethyl-1,3-disilaisoindolines; Chromatographically stable silicon-based protection for primary amines." Tetrahedron Letters 36, no. 18 (1995): 3269–72. http://dx.doi.org/10.1016/0040-4039(95)00462-l.

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43

Naidoo, Ravendra, Amit Singh, Sunil K. Arya, et al. "Surface-immobilization of chromatographically purified bacteriophages for the optimized capture of bacteria." Bacteriophage 2, no. 1 (2012): 15–24. http://dx.doi.org/10.4161/bact.19079.

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44

Burnouf, T., C. W. Chang, Y. P. Kuo, Y. W. Wu, Y. H. Tseng та C. Y. Su. "A chromatographically purified human TGF-β1 fraction from virally inactivated platelet lysates". Vox Sanguinis 101, № 3 (2011): 215–20. http://dx.doi.org/10.1111/j.1423-0410.2011.01486.x.

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45

van der Meer, R. A., and J. A. Duine. "Covalently bound pyrroloquinoline quinone is the organic prosthetic group in human placental lysyl oxidase." Biochemical Journal 239, no. 3 (1986): 789–91. http://dx.doi.org/10.1042/bj2390789.

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Treatment of purified human placental lysyl oxidase with 2,4-dinitrophenylhydrazine (DNPH) resulted in a large spectral change and inhibition of enzyme activity. Proteolytic degradation of the derivatized enzyme yielded only one single coloured product, which was spectrally and chromatographically identical with the C-5 hydrazone of PQQ (pyrroloquinoline quinone) and DNPH. Since this represents the first example of a PQQ-containing enzyme in man, possible implications of the finding are discussed.

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46

Grainger, James, V. Vikram Reddy, and Donald G. Patterson. "Hexachlorodibenzo-p-Dioxin Isomer Differentiation by Capillary Gas Chromatography Fourier Transform Infrared Spectroscopy." Applied Spectroscopy 44, no. 1 (1990): 41–46. http://dx.doi.org/10.1366/0003702904085903.

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Vapor-phase infrared spectra of the 10 hexachlorodibenzo- p-dioxin isomers were recorded at low microgram concentrations. A unique infrared spectrum was observed for each chromatographically separated or spectrally subtracted mixture component. The structures for individual isomers in each isomer pair were assigned by qualitative valence bond evaluations and empirically derived quantitative estimations of ether linkage asymmetric stretching frequencies and by correlations with characteristic aromatic skeletal stretching vibration patterns.

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47

Раджабов, А. Ш., У. Хасанов, С. С. Исхакова та ін. "Аналитические возможности термодесорбционного спектрометра с поверхностно-ионизационным детектированием молекул органических веществ в воздухе". Журнал технической физики 93, № 3 (2023): 417. http://dx.doi.org/10.21883/jtf.2023.03.54855.203-22.

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Abstract This paper presents the results of research on the development of a mathematical model of thermal desorption spectrometry with a surface ionization method for detecting molecules of organic substances, as well as an analysis of the capabilities of a thermal desorption spectrometer operating on the basis of this method. The mathematical model of the method was developed on the basis of the regularities of thermal desorption spectrometry, as well as the regularities of surface ionization of molecules of organic substances under non-stationary conditions. The spectrometer consists of a s

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48

Kráľová, Katarína, Dušan Loos, and Jozef Čižmárik. "Quantitative Relationships Between Inhibition of Photosynthesis and Lipophilicity of Piperidinoethyl Alkoxyphenylcarbamates." Collection of Czechoslovak Chemical Communications 59, no. 10 (1994): 2293–302. http://dx.doi.org/10.1135/cccc19942293.

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Piperidinoethyl esters of 2-, 3- and 4-alkoxy substituted phenylcarbamic acids (PAPC) inhibit photosynthetic processes in alga Chlorella vulgaris and spinach chloroplasts. These inhibitory activities of PAPC were correlated with chromatographically determined lipophilicity characteristics log k' (from HPLC) and Kovats indices KIO (from gas chromatography) using parabolic and bilinear model. Both theoretical models are suitable for description of studied correlations, however from the viewpoint of statistical analysis Kubinyi's bilinear model gives better results.

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49

Nellaiappan, K., R. Ramakrishnan, and M. Jameela Banu. "Evidence for the presence of quinone methide isomerase in the metacercarial cyst of Microphallus sp. (Trematoda: Microphallidae)." Parasitology 103, no. 2 (1991): 299–303. http://dx.doi.org/10.1017/s0031182000059576.

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The white colour of the cyst wall of the metacercaria of Microphallus sp., even in the presence of dihydroxy phenol and phenoloxidase, is due to proteins generated through a possible quinone methide interaction. The quinone methide isomerase converts the phenoloxidase mediated quinone into β-hydroxy catechol. Formation of catechol from quinone by cyst extracts was observed spectrophotometrically and chromatographically. This enzyme is involved in detoxification of excess quinone and β-sclerotization of the cyst wall.

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Banwell, Martin G., Cai Chun, Alison J. Edwards та Markus M. Vögtle. "Competitive Intramolecular Diels - Alder Reactions of bis-α,β-Unsaturated Ester Derivatives of Enzymatically Derived and Enantiopure cis-1,2-Dihydrocatechols. Enantiodivergent Synthesis of Monochiral Bicyclo[2.2.2]oct-2-enes". Australian Journal of Chemistry 56, № 9 (2003): 861. http://dx.doi.org/10.1071/ch03112.

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Abstract:

bis-Crotonate and related α,β-unsaturated ester derivatives of readily available and enantiomerically pure cis-1,2-dihydrocatechols engage, upon heating in refluxing toluene, in two competitive intramolecular Diels–Alder reactions to give varying mixtures of chromatographically separable and pseudo-enantiomeric bicyclo[2.2.2]oct-2-enes. Such adducts, many of which have been characterized by single-crystal X-ray analysis, are likely to serve as useful building blocks in natural products synthesis.

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