Mallinckrodt Silicar

Silica gel fluorescent layer (Mallinckrodt Silicar TLC 7GF), 0.5-mm thick Solvent... 

The silicic acid used for column chromatography and the Amberlite resin were Silicar CC-7 100-200 mesh purchased from Mallinckrodt Chemical Works, St. Louis, Mo. The 5% palladium on charcoal catalyst was purchased from Engelhard Industries Ltd., Newark, N. J. The tri-O-acetyl-D-glucal and the tri-O-acetyl-D-galactal (as a 70% solution in benzene) were purchased from Raylo Chemicals Limited, Edmonton, Alberta. 

Silica gel (Silicar CC-7 from Mallinckrodt Chemical, Inc.) was poured into a column (575 mm long and 1 cm diameter) and was tightly packed with the aid of a vibrator. This column was used to Isolate the dieplsulflde resin. Two grams of viscous liquid obtained as in the above section was diluted by the addition of 10 ml. of solvent mixture of toluene and acetone (100 1 by volume). The diluted s imple was then poured into the column. After the sample was completely absorbed by silica gel, the elution solvent (toluene acetone = 100 1) was run through the column. 

SilicAR (TLC-4GF, Mallinckrodt) 1 part, mixed with 40 parts Kieselgel (D5, A,H. Thomas) Solvents... 

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