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:
- Full text search: Enter a keyword, e.g. an author's name, a substance, a technique, a reagent or a term and see all related publications
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Phytochem. Anal. 20, 19-23 (2009). TLC of curcumin (1), demethoxycurcumin (2), and bisdemethoxycurcumin (3) from the rhizomes of Curcuma longa on silica gel with hexane – chloroform – methanol 10101 as mobile phase. Quantitative determination by recording the chromatogram using a digital scanner and analyzing the density of the TLC spot with the Scion Image software. The hRf values of (1), (2), and (3) were 42, 25, and 18, respectively. Selectivity regarding matrix was given. Linearity was between 0.375 and 6 µg/spot for all curcuminoids. The intermediate precision of the method was satisfactory. Recovery was 101.9 % for (1), 104.8 % for (2), and 101.5 % for (3). The limits of detection and quantification were 43 and 143 ng/spot for (1), 69 and 230 ng/spot for (2), and 73 and 242 ng/spot for (3). The method was compared with an official densitometric method, and the analytical results were not significantly different.
Computer averaging of TLC raw data strong improvement of quantitative Circular TLC Data. J. Planar Chromatogr. 2, 138-141 (1989). To overcome structure signals of the HPTLC-plates the concept of multiple scanning at changed angles of a planar chromatogram rotated stepwise was used. The procedure does not falsify raw data and has nothing to do with any kind of smoothing. The authors work with the mean values but do not touch the original raw data.
Anal. Chim. Acta 641 (1-2), 52-58 (2009). Comparison of classical filtering techniques (Savitzky–Golay, Adaptive Degree Polynomial Filter, Fourier denoising, Butterworth and Chebyshev IIR filters) and wavelet shrinkage (31 mother wavelets, 3 thresholding techniques and 11 decomposition levels) with the original noisy signal and a reference signal which was denoised experimentally by averaging 64 measurements. The best similarity to the reference signal was obtained with filters, however the signal was slightly oversmoothed. The wavelet shrinkage method gave less denoised signals. There was a significant influence of the thresholding technique and decomposition level, and best conditions were at level 2 or 3 and soft thresholding), whereas changing of the mother wavelet almost did not change the result. The presented results can be used as general recommendations for denoising densitometric fingerprints before applying further chemometric algorithms. The best choices were Savitzky–Golay filter of appropriate window width (optimized against autocorrelation) or wavelet shrinkage with Haar wavelet, soft thresholding and high decomposition level.
8. Integration problems in QTLC. J. Planar Chromatogr. 2, 128-132 (1989). Some integration problems in quantitative TLC are illustrated. A prepared program simulates chromatograms with different position, concentrations, and shapes of chromatographic peaks. The results of integration are presented and discussed. In TLC it is necessary to find the correct peak start. Evaluation of a small peak after a big one can be done more precisely than the evaluation of a small one in front of a large one.
J. Planar Chromatogr. 28, 126-132 (2015). TLC of 17 morphine derivatives on RP phase with 3 different mobile phases, (1) methanol - 0.02 M ammonium hydroxide, (2) methanol - 0.7 M ammonium hydroxide, and (3) methanol - 0.02 M acetic acid. In each case, the individual mobile phases contained 30-90 % (v/v; in 10 % increments) of methanol as an organic modifier. Detection by absorbance measurement at 254 nm. RP-TLC can be used for the characterization of the lipophilicity of semisynthetic derivatives of morphine.
J. Chromatogr. 500, 661-671 (1990). Development of a system making color reactions on TLC plates amenable to computer handling. Identification of unknown substances using corrected Rf values and color reactions by means of computerized retrieval from large data base, based on a series of four color reactions carried out in sequence on the same spot and by numeric encoding of the observed color with a color reference chart. Comparison of the identification power with that of GC. GC retention indices and UV absorption maxima can also be introduced in the identification program. Use of a single TLC system with color reactions provides about the same identification power as a single GC system and can be increased by using two or more different TLC systems in parallel.
J. Planar Chromatogr. 28, 115-118 (2015). TLC of 35 compounds on RP-18 and cyano phase with six modifiers (acetonitrile, acetone, dioxane, propan-2-ol, methanol, and tetrahydrofurane). The extrapolated Rm data were recomputed and compared to HPLC results with 2 modifiers. HPLC (in gradient mode) and TLC perform in comparable manner in the lipophilicity assessment of the investigated model compounds. With its simplicity, it is a strong argument to use TLC in lipophilicity studies.
Proc. 6th Int. Symp. Instrum. Planar Chromatogr., (Interlaken 1991), Inst. Chromatogr., Bad Dürkheim, FRG, 273-282 (1991). Densitometry by slit scanning mode was compared with processing mode using a video camera. A sugar TLC-chromatogram was used as example; chromatographic data not stated.