Abstract: The invention relates capillaries which are filled with or which can be filled with particulate sorbents. Said capillaries are sealed with a frit on at least one end. The frit is made of a monolithic inorganic or organic material which is directly polymerized into the capillary or which is introduced into the first capillary in the form of a second capillary filled with monolithic material.

Abstract: The present invention provides a column endpiece for a chromatography column. The column endpiece includes a base part, an extension piece for a discharge tube, and a frit. The frit produces a pressure drop per unit length that is at least twice as great as the pressure drop per unit length created in the sorbent packing when the eluent is flowing through.

Abstract: The invention relates to polyamides which are derivatized with polymerizable double bonds and are obtainable by reaction of the amino groups of the polyamide with an amino-reactive compound which contains a polymerizable double bond, or by reaction of the carboxyl groups of the polyamide with a carboxyl group-reactive compound which contains a polymerizable double bond. Examples of amino-reactive compounds which contain a polymerizable double bond are the anhydrides of ethylenically unsaturated carboxylic acids, such as acrylic acid chloride or anhydride, methacrylic acid chloride or anhydride, or vinylazlactone derivatives. An example of a carboxyl group-reactive compound is allylamine.These derivatized polyamides can be converted into polymer-modified base polymers (typically block polymers) with improved properties. These polymer-modified base polymers are suitable as adsorbents for chromatography and as carriers for enzymes.

Abstract: A stable, aqueous, substantially alcohol-free lipid standard solution, comprising water, at least one lipid, and an effective lipid-solubilizing amount of both a non-ionic detergent and an ionic detergent. A simple, convenient method for making such a solution is provided.

Abstract: In a method for detection and/or assay of hydroperoxides (or, indirectly, of substances, such as cholesterol or glucose, which react to liberate hydroperoxides) using an assay reagent comprising a water-soluble iodide, a redox catalyst and a stabilizer, an improvement is provided wherein when the determination is made in the presence of protein, the redox catalyst concentration in the reagent is 5-500 .mu.M and the stabilizer concentration in the reagent is 5-100 mg/l. A corresponding improvement in the assay reagent is also provided.