Post Archive

April 2017

Chromatography

Harvest Time · QuEChERS Time “Quick, Easy, Cheap, Effective, Rugged and Safe“ – those are the demands on sample preparation in modern food analysis. The QuEChERS method, introduced by Anastassiades et al. 2003 [1], and the subsequent development of ready-to-use mixes meet these demands. QuEChERS became the method of choice

Read More
Chromatography

Particle size 2.7 or 5 µm? The phases NUCLEOSHELL® RP 18 and RP 18plus are both offered with particle sizes 2.7 µm and 5 µm. The 2.7 µm core-shell particle has a solid core (silicium dioxide) with a diameter of 1.7 µm and a porous shell (silica gel) with a

Read More
Chromatography

Core-shell phases – RP 18 or RP 18plus? Over the last few years, modern core-shell technology has developed some highly efficient HPLC stationary phases.  These new stationary phases meet the demand for high resolution separations with short analysis times at moderate pressures. Reversed Phase (RP) core-shell silicas with other modifications

Read More
Chromatography

High Performance Thin Layer Chromatography Although HPTLC plates have been commercially available since the end of the 1970s, only few TLC users have experience with HPTLC. Previous generation TLC used silica with a particle size distribution of 5–17 µm.  The use of narrowly fractionated silica – particle size 2–10 µm

Read More