Cumulative CAMAG Bibliography Service CCBS

Our CCBS database includes more than 11,000 abstracts of publications. Perform your own detailed search of TLC/HPTLC literature and find relevant information.

The Cumulative CAMAG Bibliography Service CCBS contains all abstracts of CBS issues beginning with CBS 51. The database is updated after the publication of every other CBS edition. Currently the Cumulative CAMAG Bibliography Service includes more than 11'000 abstracts of publications between 1983 and today. With the online version you can perform your own detailed TLC/HPTLC literature search:

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      129 071
      Comparison of high-performance thin-layer with overpressured layer chromatography combined with direct analysis in real time mass spectrometry and direct bioautography for tansy root
      Ágnes M. MÓRICZ*, T.T. HÄBE, P.G. OTT, G.E. MORLOCK
      (*Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022 Budapest, Hungary; moricz.agnes@atk.hu)

      J Chromatogr A, 1603, 355–360 (2019). Samples were ethyl acetate root macerates of fully flowered Tanacetum vulgare (Asteraceae). HPTLC on silica gel (classical irregular particles vs. Lichrosphere with spherical particles) previously washed with methanol, dried for 5 min at room temperature, perimeter-sealed with a polymer coat, and heated for 30 min at 100 °C. Separation with toluene or with toluene – n-hexane 7:3, in classical capillary flow or in OPLC (overpressured layer chromatography). For OPLC, off-line infusion was used (closed mobile phase (MP) outlet, automatically stopping development); external pressure 50 bar, rapid MP flush 175 and 350 µL, MP flow rate 250 and 500 µL/min, 1830 and 3475 µL MP, development time 446 s and 424 s. Derivatization by immersion into vanillin – sulfuric acid reagent, followed by 5 min heating at 110 °C; or into PABA reagent (500 mg p-aminobenzoic acid, 18 mL glacial acetic acid diluted, 20 mL water, 1 mL o-phosphoric acid, 60 mL acetone), followed by 5 min heating at 140 °C. Effect-directed analysis using automated immersion: A) for free radical (DPPH•) scavengers; B) for activity against Gram-negative bacteria using Aliivibrio fischeri bioluminescence assay; C) for activity against Gram-positive bacteria with Bacillus subtilis bioassay. Four active polyynes were identified as hexadiynylidene-epoxy-dioxaspiro-decane (1), pontica epoxyde (nonene-triynyl-vinyl-oxirane) (2), tetradeca-triine-en-one (3) and trans-(hexadiynylidene)-dioxaspiro-decene (4), by hyphenating OPLC to quadrupole-orbitrap HRMS without eluent, using a DART interface (Direct Analysis in Real-Time, needle voltage 4kV, grid voltage 50 V, helium as gas, temperature 500 °C, full scan in positive ionization mode in m/z range 100-750). Polyynes (3) and (4) were coeluting in HPTLC but not in OPLC, demonstrating that (4) is not produced by oxidation during the DART-MS procedure. Separation with OPLC compared to HPTLC was performed in a shorter time and with better resolution at the same time. Layers with spherical particles gave higher resolution; zone distortions occurring in OPLC due to dissolved air in MP were prevented by previous MP sonication.

      Classification: 3b, 3d, 4e, 5a, 8b, 9, 32e
      127 005
      Utilization of a crown ether/amine‐type rotaxane as a probe for the versatile detection of anions and acids by Thin‐Layer Chromatography.
      S. MIYAGAWA, M. KIMURA, S. KAGAMI, T. KAWASAKI, Y. TOKUNAGA* (*Department of Materials Science and Engineering, University of Fukui, Bunkyo, Fukui, Japan; tokunaga@u-fukui.ac.jp)

      Chem. Asian J. 15(19), 3044-3049 (2020). The studied rotaxane combines a dibenzocrown of 8 ethers (DB24C8) with an axle chain (Ax) containing two amines, one of them in an aniline group, allowing stability of the rotaxane even when the other one is unprotonated. TLC on silica gel in 4 steps, with detection under UV light or after derivatization with phosphomolybdic acid in ethanol. (1) Before the synthesis of the rotaxane, unprotonated Ax was isolated by preparative TLC of the protonated Ax obtained by addition of HCl or toluenesulfonic acid (TsOH); the mobile phases were chloroform – methanol 10:1 and toluene – tetrahydrofurane 3:2, respectively. The isolated molecules were confirmed as totally unprotonated Ax by NMR, suggesting a complete loss of HCl and TsOH on the silica gel layer. (2) After synthesis, unprotonated rotaxane, pure vs. monoprotonated by the addition of 10 different acids (and purified by column chromatography CC), was applied on TLC plates and developed with dichloromethane – acetone – water 3:16:1; the hRF values were very different, depending on the counter-anions from the used acids. (3) The same behavior (except with sulfuric acid) was observed under the same conditions when CC was omitted (unprotonated rotaxane samples were mixed with each of the acids, or with two acids at the same time for acid-competitive TLC analysis). (4) When unprotonated rotaxane was applied under the same conditions as in step (3) with the sodium salts instead of the acids, the behavior was similar (except for the shapes of the spots, due to the salts in excess). The rotaxane can thus be used for the TLC separation and detection of sodium salts, by forming salts of protonated rotaxane with the anion afforded by these sodium salts. The rotaxane protonation seems to be promoted by the methanol of the spotting mixture; indeed, when step (3) was performed with the mobile phase chloroform – methanol 10:1, a second zone appeared because methanol formed a salt with the rotaxane (identified by NMR).

      Classification: 4e, 5a, 5b, 17a
      55 017
      Long chain phenols
      A. DURRANI, G. SUN, J. TYMAN

      Synthesis of oxidative degradation products from the methylated component. Phenols of anacardium occidentale and other phenolic lipids: confirmation of the structure of the parent phenols and of a related material. Lipids 17, 561-569 (1982). Isolation of the degradation products of anacardic acid, cardol, 2-methyl-cardol and cardanol by TLC on silica with a) chloroform, b) chloroform ethyl acetate 95:5, c) chloroform - petrol ether 6:4. Detection and visualization acc. to J. Caplin and J. Tyman, J. Chem. Res. 5, 34-35, 11, 0321- 0351 (1982).

      Classification: 5a, 7, 32e
      57 011
      The role of electric interaction in the retention index concept
      H. LAMPARCZYK

      Universal interaction indices for GLC, HPLC and TLC. Chromatographia 20, 283-288 (1965). Proposal of universal interaction indices used in TLC, GLC and HPLC, which can be easily calculated from commonly used retention parameters, such as Rf values, relative retention times etc. Presentation of the calculation examples for polycyclic aromatic hydrocarbons and n-alkanes. Demonstration of the application of the electric interaction indices for studying the retention mechanism.

      Keywords:
      Classification: 2b, 5a, 5b
      57 042
      Clathration of n-alkanes on thin-layer chromatography plates
      G. KOVACHEV, T. MINCHEVA, M. DACHEVA

      V. Danube Symposium on Chromatography, Yalta, November 11-16, 1985. TLC of n-alkanes on silica with hexane - ether 1:1. Identification with Rhodamine GG. Extraction from scraped area with ether.

      Classification: 5a
      63 020
      Congruent cuticular hydrocarbons
      K.E. ESPELIE*, H.R. HERMANN, (*Dep. of Entomology, Univ. of Georgia, Athens, GA 30602, USA)

      Biochemical systematics and ecology 16, 505-508 (1988). TLC of hydrocarbons on silica with hexane - ether - formic acid 40:10:1. Visualization under UV after spraying with a 0.2% ethanolic solution of 2',7'-dichlorofluorescein. The hydrocarbon fractions were recovered from silica by elution with chloroform - methanol and analysed by GC.

      Classification: 5a
      66 044
      (Enantioselective intramolecular Diels-Alder reactions of tienes synthesized from monosaccharides
      P. HERCZEGH*, M. ZELY, L. SZILAGYI, I. BAJZA, GY. BATTA, Z. DINYA, R. BOGNAR, (*Inst. of Chem., Univ. Kossuth Lajos, H-4000 Debrecen, Hungary)

      Magyar Kemiai Folyóirat 96, 20-27 (1990). TLC of trienes on silica with hexane – ether 9:1. Detection under UV 254 nm and/or by spraying with sulfuric acid in 10% ethanol, heating at 110°C.

      Classification: 5a
      68 065
      Studies of the oil of Mimusops Elengi seed
      B. MANDAL*, C.R. MAITY, (*Dep. of Chemistry, B.N. Mahavidyalaya, Itachuna, 712147 Hooghly, W.B. India)

      Acta Alimentaria, 20, 103-107 (1991). TLC of oxygenated or cyclopropene fatty acids and their methyl esters on silica with hexane - ether - acetic acid 79:20:1. Detection by spraying with concentrated sulfuric acid.

      Classification: 5a