Carboxylic acid ester hydrolyzes to form carboxylic acidReaction example Reaction description: This reaction is the hydrolysis of carboxylic acid ester under alkaline conditions, and then acidic post-treatment to generate the corresponding carboxylic acid and alcohol.reaction mechanism A: Hydroxide ions attack the ester carbonyl group to form a tetrahedral intermediateB: Under...

The crimp-sealed vial is a type of sample bottle used in instruments such as gas chromatography and liquid chromatography. Its sealing is achieved through the crimp cap. Here are the methods for crimp-sealed vial sealing: Manual Crimper: The manual crimper is a common sealing tool used to manually crimp the...

Transparent storage sample bottles are made of glass, and when discussing this material, it is essential to mention the coefficient of linear expansion, which indicates the change in the length of glass per degree of temperature change. In simple terms, it reflects the glass's ability to withstand significant temperature variations....

Sample bottles come with three types of caps: crimp caps, snap caps, and screw caps. Each sealing method has its own advantages. Crimp Caps Crimp caps compress the septum between the bottle rim and the crimped aluminum cap. This provides excellent sealing, effectively preventing sample evaporation. The position of the...

Thin-Layer Chromatography (TLC) is based on the affinity separation of compounds in a mixture. It is a widely used universal separation method for sample identification and quantification. TLC can be employed to analyze substances from various categories, including pesticides, steroids, alkaloids, lipids, nucleic acids, glycosides, sugars, and fatty acids. In...

1. Introduction and Applications of Melting Point Capillary Tubes: Melting point capillary tubes are small glass tubes primarily used for determining the melting point of substances. In experiments, the substance to be tested is loaded into the melting point capillary tube, heated to melt and then cool to solidify, and...