57439-U

SPME-OC Fiber Assembly, Polydimethylsiloxane/Divinylbenzene (PDMS/DVB)

d_f 75 μm(Coating thickness includes 65 μm coating + 10 μm OC (overcoating), needle size 23 ga, pkg of 3 ea, fiber L 1 cm

• Synonym(s): SPME-Overcoated Fiber Polydimethylsiloxane/Divinylbenzene (PDMS/DVB)
• NACRES: NB.21

Properties

• material: StableFlex fiber (Polydimethylsiloxane/Divinylbenzene (PDMS/DVB)); notched pink hub
• Quality Level: 100
• needle size: 23 ga
• description: Polydimethylsiloxane/Divinylbenzene (PDMS/DVB) fiber overcoated with a layer of PDMS.
• packaging: pkg of 3 ea
• df: 75 μm (Coating thickness includes 65 μm coating + 10 μm OC (overcoating))
• technique(s): solid phase microextraction (SPME): suitable
• fiber L: 1 cm
• matrix active group: PDMS/DVB coating, Overcoated Polydimethylsiloxane/Divinylbenzene
• application(s): food and beverages
• compatibility: for use with autosampler or manual (for direct immersion into matrix or headspace analysis of volatile or semi-volatile analytes (MW 50-300+))

Description

General description

A new development in SPME fiber technology incorporates a protective overcoating on the fiber. This overcoating, which consists of polydimethylsiloxane (PDMS) serves as a barrier to protect the fiber from the matrix, which makes it more physically robust and less prone to chemical fouling. High background samples, such as many foods, pose a challenge to immersion SPME due to the presence of fats, sugars, pigments, and other macromolecules. These can stick to the SPME fiber and reduce its usable life and/or be transferred to the GC, where they may interfere with chromatographic analysis. Overcoating the fiber with PDMS reduces these problems.