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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      82 009
      Reversed-phase thin-layer chromatographic determination of the hydrophobicity parameters of nonsteroidal anti-inflammatory drugs
      E. FORGACS, T. CSERHATI, R. KALISZAN, P. HABER, A. NASAL, (Inst. of Chem., Chem. Res. Centre, Hungarian Acad. of Sci., P.O. Box 17, H-1525 Budapest, Hungary)

      J. Planar Chromatogr. 11, 383-387 (1998). The lipophilicity and specific hydrophobic surface area of 18 nonsteroidal anti-inflammatory drugs have been determined by RP TLC for subsequent studies of quantitative structure-activity relationships (QSAR). The mobile phases were mixtures of water and methanol containing 59 mM acetic acid, sodium acetate, or sodium chloride. The lipophilicity and specific hydrophobic surface area were calculated from the linear relationship between the actual RM value of the solutes and the concentration of methanol in the mobile phase. RP TLC on silica gel impregnated by overnight development in n-hexane - paraffin oil with water - methanol mixtures; the methanol concentration ranged from 0 to 35% in steps of 5%. The solute spots were revealed by their UV absorbance.

      Keywords:
      Classification: 2d
      88 013
      Study of the hydrolytic cleavage of alkyl ligands from the surface of chemically bonded stationary phases by means of selected analytical techniques
      G. KOWALIK, T. KOWALSKA*, (*Inst. of Chem., Silesian Univ., 9 Szkolna Street, 40-006 Katowice, Poland)

      J. Planar Chromatogr. 14, 224-233 (2001). Review of findings on the susceptibility of the organic chemically bonded ligands to hydrolytic cleavage from the silica matrix for the most common TLC-type stationary phases, i.e. RP-18, RP-8, CN and DIOL. This process was induced by repeated (i.e. one-, two-, four-, and eightfold) development of these phases with mixed mobile phases comprising methanol, water, and buffers of different pH. Quantification of the extent of hydrolytic cleavage of the different ligands from the silica gel surface was basically achieved by means of Raman spectroscopy, although other analytical techniques like elemental (combustion) analysis, thermogravimetry, and differential scanning calorimetry were also employed. Also investigation of the factors influencing the efficiency of the hydrolytic cleavage.

      Keywords:
      Classification: 2d, 3b
      96 081
      Determination of the partition and distribution coefficients of biologically active compounds by reversed-phase thin-layer chromatography
      Elzbieta Brzezinska*, J. Stolarska (*Medical University of Lódz, Department of Analytical Chemistry, ul. Muszynskiego 1, 90-151 Lódz, Poland)

      J. Planar Chromatogr. 18, 443-449 (2005). TLC of six 2-[1-(4-alkylpiperazinyl)]benzothiazoles, two 2-[4-(1-alkyl)piperidinyl]benzothiazoles, three 2-(N,N’-dimethyl-1,2-ethanediamino)benzothiazoles, and 2-[1-(4-aminopiperidinyl)]benzothiazole on RP-18 in a saturated horizontal chamber with mixtures of acetone and aqueous Tris (tris(hydroxymethyl)-aminomethane) buffer (pH 7.4). The organic modifier (acetone) content varied from 40 to 85 % in 5 % increments. Detection under UV.

      Classification: 2d, 32a
      110 008
      Revisiting thin-layer chromatography as a lipophilicity determination tool
      E. GOWIN, L. KOMSTA* (*Department of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 4, 20-090 Lublin, Poland, lukasz.komsta@umlub.pl)

      Part II – is silica gel a reliable adsorbent for lipophilicity estimation? J. Planar Chromatogr. 25, 5-9 (2012). TLC of 35 simple compounds with known literature lipophilicity on silica gel with nine concentrations of six modifiers: acetone, dioxane, ethyl acetate, methylethylketone, propan-2-ol, and tetrahydrofuran as mobile phases. Different approaches for lipophilicity determination such as single TLC run, Soczewiñski-Wachtmeister equation coefficients, principal component analysis (PCA) of the retention matrix, and PARAFAC on a three-way array were applied.

      Classification: 2d
      62 016
      Analysis of multiple front formation in the wetting of thin-layer plates
      A. VELAYUDHAN, B. LILLIG, C. HORVATH, (Dep. Chem. Eng., Yale Univ., New Haven, CT 06520, USA)

      J. Chromatogr. 435, 397-416 (1988). Study of the formation of multiple fronts when pure liquids such as methanol and heptane and multi-component liquids such as ethanol - toluene mixtures flow through dry TLC layers of silica or octadecyl-silica. Measurement of the dynamics, and explanation of the formation and motion by using a model.

      Keywords:
      Classification: 2d
      68 007
      The influence of layer porosity on the flow resistance and apparent particle size of thin-layer chromatography plates
      W.P.N. FERNANDO, C.F. POOLE*, (*Dept. of Chem., Wayne State Univ., Detroit, MI 48202, USA)

      J. Planar Chromatogr. 3, 389-396 (1990). Forced flow development (OPLC) was used to determine the porosity, permeability, and apparent average particle size of commercially manufactured TLC plates and Empore sheets. Compared with columns, layers exhibit smaller values for the total porosity (eT - 0.69) and interstitial porosity (e U - 0.42).

      Keywords:
      Classification: 2d, 3b
      71 122
      Chromatographic characteristics of porphyrin ether glycerides
      J. SLIWIOK, P. KUS, A. KOZERA, (Inst. Chem., Silesian Univ., 40-006 Katowice, Poland)

      Chromatographia 34, 431-432 (1992). Reverse-phase TLC of porphyrin ether glycerides on RP-18 silica with acetone - methanol 1:1, and paraffin oil - impregnated silica with acetone - methanol 1:1. Also HPLC. Supplementary physico-chemical characteristics are given for the compounds.

      Keywords:
      Classification: 2d, 23a
      76 022
      Prediction of retention data in multiple development
      B. SZABADY, M. RUSZINKO, S. NYIREDY*, (Res. Inst. for Med. Plants, H-2011 Budakalasz, P. O. Box 11, Hungary)

      Part I. Linearly increasing development distances. J. Planar Chromatogr. 8, 279 - 283 (1995). Determination of the value RFn, the retention factor after the nth development step (i.e. the ratio of the total migration distance of the component during consecutive development steps to the chromatographic distance of the last development step). The zone width dn of a given spot (after the nth step) is also predicted. The elaborated models are supported with experimental results. - TLC and HPTLC of mixtures of furocoumarin isomers, cannabinoids, and poppy alkaloids (isopimpinellin, xanthotoxin, bergapten, psoralen, angelicin; cannabigerol, cannabichromene, cannabidiol; morphine, codeine, narcotoline, thebaine, papaverine, narcotine) on silica with chloroform and toluene as monocomponent mobile phases for furocoumarins and cannabinoids, resp. chromatography of poppy alkaloids was performed with ethyl acetate - acetone - hexane - methanol - dichloromethane - diethylamine 113:113:226:19:19:1. Detection and evaluation under UV 313 nm for furocoumarin isomers, at 200 nm for cannabinoids, and at 280 nm for alkaloids.

      Keywords:
      Classification: 2d