Good morning.
TLC method used by both the U.S. and other countries.
In the U.S. it is used relatively infrequently. The reason for the economic.
2% of the U.S. population consumes 25% of resources and produce 50% of the garbage on the planet, as the dollar is an international means of payment everywhere.
Therefore controlling the organization in the United States can afford to use expensive equipment, such as LC-MS solutions for trivial problems. Method of fire "from anti-aircraft guns on the wheel (a small bird)" certainly is not effective for the cost of transporting guns and ammunition, but allows for the luck to kill a bunch of sparrows with one shot for many miles. While under favorable conditions, can kill a sparrow tiny pebble from a slingshot, and th (rubber bands), but you need to know the habits of sparrows and the place where they can come up during feeding a few meters. It should be noted that if a fire does not know how, fatally unlucky or sparrows there's the gun will not help.
It is important to note that many companies producing equipment for HPLC have offices located within the United States. In addition, HPLC requires the use of standards, it is good business for the FDA.
There is another point. Work on the HPLC chromatograph as an operator can be a week to teach not only rights but also a monkey. Very stable type of device for reproducible results over time. This allows us to use for data collection is very low-skilled operator who can pay less.
And with TLC harder - the method must "feel" and this comes only with long practice.
In the European Union HPLC dragged lower, but the quantitative TLC is also not apply - the most well-known company in the field of densitometry is an American Kamaga.
Europeans are more like different types of spectroscopy, titration, although the HPLC and GC do not disdain.
Historically, WHO is actively promoting the TLC-considered that the use of this method is useful for finding gross counterfeit drugs and reduces the cost of backward African countries.
I came across the interesting work of Cubans.
About our business. During Soviet times, technical policy corresponded approximately to the current technical politki Europe, except for some nuances - the USSR in the 80 years refused to produce the NMR and was unable to master the manufacture of HPLC chromatographs except for the original UPLTS MiLiChrome.
Tech Culture for civilian enterprises electronics industry did not reach the level of production of precision products, and the military and without instrumentation were a lot of work. Therefore, HPLC was used little and is actively used by GLC (because there was a list of the serial range of gas chromatographs).
Now the technical policy is absent as such, one obezyannichine / copying others' actions without understanding the meaning - about how people imitate monkeys in the circus / - then under the United States is under the Europe.
However some are of use to quantify the TLC still remained from the days of SEV - see for example Sorbpolimer from Krasnodar.
Again, you can get in touch with a reputable Gennady Plahoniem (Garry) on anchem.ru
A very strong school of TLC was in University of Tartu (Estonia), Professor Miles has worked seriously and densitometry.
But with the destruction of the Soviet Union and Estonia's accession to the EU to all this came kaput. Estonia as a state was not viable - the customers for its industry had been in Russia and the raw materials it received from the same place. After separation of Estonians fell on bad times - they are so impoverished that was taken for metal scrap not only monuments in Tallinn, but all the copper wire grid ..
From "brothers-Slavs" - very strong developments in quantitative TLC were in Bulgaria (Sharshunova, Petets and Kopec) and Czechoslovakia.
Translation of Google, has not been edited. Therefore, for the ugly text - excuse.
