Jan 2, 2006 · Figure 3 - Typical mass chromatogram of volatile residue in hexane caused by PTFE/silicone septa: a) hexane extract of a piece of septum; b) vial septum was punctured once by a syringe to sample 1 μL hexane for GC analysis; c) hexane in the last vial was reanalyzed after 3 days; and d) analyzed immediately after 100 μL hexane was added from one vial to another (the septum was punctured 10

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A GC septum is located at the top of the injection port and serves two functions: 1) providing a leak-free seal to maintain carrier gas pressure inside the system. 2) handling repeated puncturing by a syringe needle for sample introduction purposes without severe coring or leaking. Temperature-Programming: When performing temperature-programmed

Ensure optimal performance of your GC instrument with bleed and temperature optimized Aijiren Tech™ BTO and TR-Green Septa. Made of low-bleed silicone, these septa have excellent mechanical properties, are ideal for demanding GC-MS applications, and may be used reliably up to 400 °C.

tearing of the GC inlet septa leading to septa siloxane contamination peaks in the chromatogram. Rough edges may be removed by smoothing with a fine sandpaper. Unblocking Syringes All syringes block occasionally, however if regular blockages are encountered it is likely that there is a problem with the syringe maintenance program, needle

Inlet Septa for Gas Chromatography. Advanced Green inlet septa eliminate sticking and reduce coring. Bleed temperature optimized (BTO) inlet septa are preconditioned and ready to use with low-bleed, mass spec capillary columns. Our long-life septa are specially formed for extended use, meaning less downtime. Explore Aijiren's complete portfolio

HPLC & GC Certified Screw Vial & Cap Kits for 2 mL Samples. Precleaned, EPA certified assembled kits; includes 40 mL screw vials and 24 mm. open top screw caps. 0.3 and 1.5 mL screw top vial-cap kits for analysis of small sample volumes. For use with environmental analyses under EPA regulations.

May 29, 2021 · Gas chromatography (GC) and gas chromatography–mass spectrometry (GC-MS) represent powerful tools for the quantitative and structural analysis of plant lipids. Here, we outline protocols for the isolation, separation, and derivatization of plant lipids for subsequent GC and GC-MS analysis. Plant lipids are extracted with organic solvents and

PTFE/silicone septa are always best. What force is required to penetrate the septum? Generally, silicone septa are more easily pierced than red rubber or butyl septa. For thicker, hard-to-pierce septa, a small gauge (23 gauge) needle may be required, or a stronger S-needle can be used. Preslit septa are the best option for

The 25 m × 0.25 mm × 3 µm capillary column, CPQ (Varian Inc., Middelburg, The Netherlands) was used. The oven temperature program was as follows: initially, 40°C held for 2 min, then ramped 10°C/min to 140°C, next ramped 5°C/min into 270°C and held for 3 min. The auto sampler for the GC–MS system equipped with SPME Carboxen-PDMS

Features. The preferred septum for autosamplers. Pre-pierced for extended life and reduced coring. Ideal for overnight runs. Up to 400 injections per septum. Plasma coating eliminates sticking. Maximum injection port temperature 350 °C. Soft, 45 Durometer, easy on autosampler needles. Blister packaging for cleanliness and convenience.

Jul 10, 2012 · Different septa shown in Figures 2A–2D used in this study were obtained from various sources, including: SGE Analytical Science (Australia, part number 041904; suggested application maximum temperature of 400°C); yellow PTFE coated (part number 041827 suggested application maximum temperature of 200°C); Aijiren Tech BTO (part number THC31303230 no suggestion of application maximum

Septa and cap compatibility ‒ septa that are too thick may prevent proper cap fitting; Crimp vs. screw cap closures; Screw caps are more often used for LC and LC/MS; Crimp caps work well for GC and GC/MS applications, help avoid sample tampering, and are recommended for working with volatile compounds

PTFE septa are not resealable and should not be used with highly volatile solvents, short cycle times or multiple injection methods. PTFE septa are rarely used for GC applications. Polyethylene (PE) septa and integral molded closures Chemically resistant polyethylene septa are molded into single-piece caps.

Aijiren's 2 mL crimp vials and 11 mm crimp vial caps are the perfect fit for HPLC and GC autosamplers across a wide variety of applications, including pharmaceutical, environmental, energy and fuels, forensics, materials science, biopharmaceutical, proteomics, and metabolomics. The 2 mL crimp cap vial is especially powerful with GC, GC/MS