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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Studied by Different Chromatographic Techniques. Chromatographia 63 (Supplement 13), S81 - S86 (2006). TLC of isoquinoline alkaloids (chelidonine, chelerythrine, sanguinarine, coptisine and berberine) in Chelidonium plant organs on silica gel with chloroform - methanol 2:1, and methylene chloride - methanol 97:3. Quantification by densitometry at UV 254 nm. Detection is very sensitive because of fluorescence of alkaloids without purification. Comparison with HPLC, showing that the TLC methodis the most simple, accurate, reproducible and convenient analytical technique for fast investigations and routine determination of Chelidonium alkaloids.
J. Chromatogr. A 1043 (1-2), 243-251 (2007). Presentation of the coupling of planar chromatography with direct analysis in real time time-of-flight mass spectrometry (DART-TOF-MS) for the first time. By cutting the plate within a track led to substance zones positioned on the plate edge, the interested zones were directly introduced into the DART gas stream to obtain the mass signals instantaneously within seconds, giving the detectability in the very low ng/zone-range on the example of isopropylthioxanthone. The coupling was perfectly suited for identification and qualitative purposes, but for quantification of results the analytical response and the repeatability were strongly dependent from proper manual positioning of the HPTLC plate into the excited-state gas stream of the ion source. By using stable isotope-labeled standards the drawback can be overcome demonstrated with the example of caffeine, and the analytical response (r2 of 0.9892) and repeatability (RSD < ±5.4%, n = 6) were improved to a high extent. The spatial resolution by an in-house-built plate holder system was shown to be better than 3 mm; the decay of the signal was observed. Comparison of the efficacy of this new coupling to a plunger-based extraction device for HPTLC/electrospray ionization–MS. The detectability of latter showed to be down to the pg/zone-range, e.g. the limit of quantification for isopropylthioxanthone to be 100 pg/zone. The repeatability was comparable (RSD ± 6.7%), however, without the need of internal standard correction, and the analytical response slightly better (r2 of 0.9983). The spatial resolution was 2 mm or 4 mm depending on the plunger head used.
CBS 100, 9 (2008). The drying step contributes significantly to the overall experimental variability of the TLC system. Comparison of different drying procedures demonstrated that homogenous, rapid and heatless drying by the automatic developing chamber ADC 2 reduced the overall standard deviation by up to a factor of 3 compared to manual use of a hair dryer.
J. Liq. Chromatogr. Relat. Technol. 31, 250-262 (2008). Analytical and preparative TLC of saponins (arganine A, C, D, and tieghemelin in the seed of Tieghemella heckelii) on silica gel with chloroform - methanol - 0.5 % TFA 12:8:1. Detection by spraying with a solution of 2 % cerium sulfate in 5.6 % sulfuric acid.
Abstract No. 9402, IHCB (2009). HPLC and HPTLC methods were developed for the simultaneous estimation of vasicine and vasicinone in Sida cordifolia and Sida acuta roots. HPTLC of vasicine and vasicinone on silica gel with ethyl acetate - methanol - ammonia 40:10:1. Quantitative determination by absorbance measurement at 300 nm. Linearity was 320-960 ng/spot (vasicine) and 80-400 ng/spot (vasicinone). Linearity by HPLC was 4-20 µg/mL. The HPTLC method was more suitable because of high throughput and low analysis time.
J. Planar Chromatogr. 23, 230-232 (2010). HPTLC of (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epigallocatechin gallate, (-)-epicatechin gallate, procyanidin B2, procyanidin A2, and methylxanthines (theobromine and caffein) on cellulose with n-propanol - water - acetic acid 20:80:1 in a horizontal chamber. Detection by dipping for 1 s into 4-dimethylaminocinnamaldehyde detection reagent. Quantitative determination by absorbance measurement at 655 nm. By densitometry LOD for (-)-epicatechin and procyanidin B2 was 0.2 and 2 ng/zone, respectively; LOQ was 0.4 ng and 4 ng/zone, respectively. These limits were lower by a factor 50 for (-)-epicatechin and by a factor of 10 for procyanidin B2 than those obtained by HPLC. The TLC method gave a more accurate result for the (-)-epicatechin content of baking chocolate than the HPLC method which was also more time-consuming.
J. Planar Chromatogr. 23, 415-419 (2010). The paper summarizes the classification and applicability of centrifugal layer chromatography and rotation planar chromatography (RPC). The combination of TLC with centrifugal force resulted in the introduction of centrifugal layer chromatography which was renamed rotation planar chromatography because the abbreviation CLC had been used for column liquid chromatography. In analytical RPC three development modes are possible - circular, anticircular, and linear. On-line and off-line sample application, separation, and detection can be combined. RPC is suitable for analytical, micro-preparative, and preparative separations. The term RPC covers five basic techniques: normal chamber, micro-chamber, ultra-micro chamber, column and sequential RPC. Most RPC methods are applicable to preparative separation of a single sample. Analytical RPC is rarely used.
J. Sep. Sci. 33, 1954-1958 (2010). HPTLC of clofentezine in medical herb extracts on silica gel with tetrahydrofuran - n-heptane 3:7. After drying for 20 min, the plate was turned 90 ° and developed with ethyl acetate - n-heptane 1:4. Quantitative determination by absorbance measurement at 254 nm. Limits of detection and quantification were 230 and 700 ng/zone respectively. The average recovery (by standard addition) was 55.8 %.