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Chromatography

Figure 3: Influence of the particle size Conditions: SPE Column type: CHROMABOND® HR-X polypropylene columns 45 µm or 85 µm, 3 mL, 60 mg; Sample pretreatment: addition of 0.25 mL 1 mol/L KH2PO4 buffer pH 2.5 to 10 mL water sample solution; Conditioning: 3 mL methanol, 3 mL KH2PO4 buffer (25 mmol/L pH

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Chromatography

Determination of residues of sweeteners in fresh water In water analysis the investigation of residues of sweeteners has gained more importance in the last few years. With the increased consumption of reduced calorie products, many sweeteners are widely distributed in the environment unchanged (without degradation).  This is also true for

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Chromatography

  Filtration of polar samples A polar aqueous sample requires a hydrophilic membrane.  The hydrophilic membrane of the cellulose mixed esters (MV) syringe filter has very low adsorption of dissolved substances and is suitable for such sample. If the sample additionally contains water-soluble oligomers and polymers (especially biological macromolecules) a

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Chromatography

Always the right syringe filter For the preparation of complex samples including after successful derivatization of the analytes, a rapid filtration is required.  This is necessary to protect the instrument from damage by particulates.  Most analysts simply use the first syringe filter they find in the lab.  However, often that

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Chromatography

Applications of the wide pore RP phases NUCLEODUR® 300 The NUCLEODUR® 300 RP phases are used for the analysis of biological macromolecules like proteins (s. appl. nos. 126580, 126800, 126570) and peptides (s. appl. no. 126610). Separations of protein and peptide mixtures with wide pore RP phases can be also

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