Purity can then be checked by thin layer chromatography on a microcrystalline cellulose plate using either a system of butanol-acetic acid-water, n-propanol-water, or methanol-water.
22.
In the analysis of a chemical reaction by thin layer chromatography ( TLC ), the reagent can also be used ( usually 0.2 % solution in either n-butanol or in ethanol ).
23.
The test's lack of specificity and tendency to produce false positives means it is not widely used for presumptive drug testing, although it does still play a role as a thin layer chromatography stain.
24.
Its electron acceptors were characterized by its discoverers Krumholz and Bryant, who used ultraviolet absorbance to measure caffeate disappearance, thin layer chromatography to identify benzenoids, and the phenol sulphuric method for determining carbohydrate content.
25.
More advanced analytical techniques, such as thin layer chromatography, high performance liquid chromatography, and mass spectrometry may also be useful in initially characterizing the chemical composition of lichens or when spot tests are unrevealing.
26.
In the development of thin layer chromatography plates with diazotized p-nitroaniline spray, cryogenine produces a purple spot ( as does sinicuichine, another biphenylquinolizidine lactone alkaloid found in " Heimia " species ).
27.
Measurement techniques include chromatography ( by silver ion chromatography on thin layer chromatography plates, or small high-performance liquid chromatography columns of silica gel with bonded phenylsulfonic acid groups whose hydrogen atoms have been exchanged for silver ions ).
28.
To test for patulin contamination, a variety of methods and sample preparation methods have been employed including thin layer chromatography ( TLC ), gas chromatography ( GC ), high-performance liquid chromatography ( HPLC ), capillary electrophoresis.
29.
With position 10 sufficiently shielded reaction with chloromethyl benzyl ether produced the di ( chloromethyl ) adduct which was further converted to the dithiophenyl compound "'63 "'using thiophenol, isolation of which required thin layer chromatography.
30.
The first test, using thin layer chromatography ( TLC ) revealed the ink contained no iron, and was based on a synthetic dye called nigrosine, patented and commercially available in 1867, and in general use in writing inks by the 1870s.
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