Mostly, the common SPE cartridges are syringe-type devices which are made of polyethylene materials. There are two pieces of patches which are made of polypropylene or glass fiber.
In the middle of the patches, it is often filled with a certain amount of chromatographic adsorbent. The upper end of the SPE cartridge is open, and the lower end is the liquid outlet. After flow through the adsorbent, the liquid will expel from the outlet. According to the volume of space above the adsorbent in the cartridge, the specification can be ranged from 1 ml, 3 ml, 6 ml, 10 ml, 15 ml, 20 ml, 30 ml, 60 ml and so on.
Also, the SPE cartridges of special specification can be manufactured according to specific application requirements. From the appearance, most of the SPE cartridges are the syringe type. Some of the cartridges are in a funnel shape, which is convenient for loading more samples at one time when in manual manipulation.
The SPE cartridge without sieve plate is a new kind of one body style cartridge. Using the special processing on C18 and C8 bonded silica gel adsorbent, this kind of SPE cartridge has relatively high mechanical strength and strong toughness.
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