25 Aluminium sheets 20 x 20 cm

Precoated Kieselguhr or mixed Silica gel/Kieselguhr plates are only of small importance nowadays. Kieselguhr layers are used like cellulose layers for the TLC separation of polar and moderately polar substances. Polyamide, on the other hand , is used for the separation of flavonoids and other phenolic substances.

Layer thickness: 170 - 220 µm

Deviation of layer thickness per plate: ≤ 30 µm

Chromatografic testings:

A) colour test

hRf-values

- bleu vif organol, colour test, lipophile:

20 - 30

- Ceres Black G, colour test, lipophile: 50 - 60

- ceres Violet brn, colour test, lipophile: 60 - 70

Typical value determined on a conditioned sheet

Eluent: toluene (45% rel. humidity)

B) PHB- Ester

- phb-methylester, phb-ester-test: 20 - 30

- phb-ethylester, phb-ester-test: 30 - 40

- phb-propylester, phb-ester-test: 40 - 50

Typical value determined on a sheet

Eluent: Pentane/ glacial acetic acid (88/12 v/v)