From 0.9 g extract the STS-12 rotor yielded more recovery of 110.4 mg total with amounts varying from 11.2 mg to 64 mg of the sutherlandins and apparent increased separation efficiency as noted by less volume of each fraction peak. A clear liquid ink that is combined with both resin and pigments to make up the vast majority of the ink but is diluted with a solvent that is 80:20 which is the ratio of solvent and solute in the blend. The rotor holds more layers and increased length of tubing. Flexographic Solvent Blend 80:20 is a chemical solvent ink that is a Propyl blend of both N-Propanol and N-Propyl Acetate. Leading plate supplies have tested and approved Flexo Wash cleaning solutions to ensure the cleaning liquid and equipment do not damage and tear the plates in any way. The same extract was fractionated in the new STS-12 rotor of the same outside dimensions but with more radial channels forming 12 loops of the tubing instead of 4. The Flexo Wash cleaning liquids for plates are all designed to clean different types of printing plates: Photopolymer, HD plates, letterpress and laser engraved plates. The yield of purified flavonoids from 0.9 g extract varied from 8.6 mg to 54 mg of the sutherlandins for a total of 85.3 mg. In the spiral tubing support rotor, STS-4 for high-speed counter-current chromatography, several polar butanol aqueous solvent systems were selected using a log K plot, and the novel flavonol glycosides (sutherlandins A–D) were well separated by the optimized solvent system (ethyl acetate:n-butanol:acetic acid:water 5:1:0.3:6 by vol.).
Spiral countercurrent-chromatography has great potential for improving the capacity and efficiency of purification of secondary metabolites, and here we describe applications useful for the isolation of flavonoids from the widely used South African medicinal plant, Sutherlandia frutescens (L.) R. Sarah investigated the swelling dynamics of a nematic LCE film immersed in a binary solvent system. Tower 229-S Solvent (80/20 Solvent) is a moderately fast drying general purpose flexographic ink thinning solvent and cleaner for solvent based flexographic ink.
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