maggie geng on LinkedIn: Optimize Your Chromatography with Pre-Slit PTFE/Silicone Septa! Key… (2024)

What materials are HPLC or GC vials usually made of?Sample bottles usually come in materials Type I, 33-expanded borosilicate glassIt is the most chemically inert glass available and is commonly used in analytical laboratories to obtain high-quality experimental results. Its expansion coefficient is about 33x10^(-7) ℃, mainly composed of silicon and oxygen, and also contains trace amounts of boron and sodium. Type I, 51-expansion glassMore alkaline than 33-expanded glass and can be used for a variety of laboratory purposes. Its expansion coefficient is about 51x 10^(-7) ℃, mainly composed of silicon and oxygen, and also contains trace amounts of boron. Polypropylene plasticPolypropylene (PP) is a non-reactive plastic that can be used where glass is not an appropriate option. Polypropylene vials retain their seal when exposed to fire, minimizing exposure to potentially hazardous substances. The maximum operating temperature is 135 ℃.

Hot Products9mm Short Screw Thread HPLC Vials 9mm screw thread caps, septa, and vials are designed especially for use with Agilent's and other rotating or robotic arm samplers 2ml. 9mm 12X32mm vials are manufactured of Type 1 Class A or Amber, Type 1 Class B borosilicate glass, and include a write-in patch for sample identification. Available in clear and amber. Caps are made of high-quality polypropylene to exact manufacturing tolerances and lined in a controlled manufacturing environment. Available cap colors include yellow, red, green, and blue. Our septa use only the highest quality materials to ensure proper function and can be pre-slit to ease needle penetration. Designed for single injection and/or short sample cycles, particularly for LC applications. The absence of an elastomer layer reduces the potential for contamination.We can provide OEM labels and packaging.

We all know that food is related to human survival, but do you know that gas chromatography technology plays an important role in our daily diet? It is widely used in food safety testing without our knowing it, such as analyzing and detecting gases in food packaging bags, detecting food additives, detecting food quality, and detecting pesticide residues on food surfaces.High-quality headspace vials can help laboratory personnel obtain accurate analysis results more efficiently.Aijiren offers a range of high-quality headspace vials to match different autosamplers. All headspace vials are standard vials：20mm crimp headspace vial/18mm precision screw headspace vialSuit for Varian, Tekmar, Perkin Elmer, and LEAP autosamplersMaterial: Neutral borosilicate glass tubeColor: Clear/Amber.Volume: 6ml/10ml/20ml

How do you usually store your experimental samplesAijiren's 15mm screw thread caps, septa, and vials kits are designed especially for use with Agilent's and other rotating or robotic arm samplers, compound storage, and other non-chromatography applications.The Storage vials are suitable for packaging various pharmaceutical intermediates, high-value-added chemicals, chemical reagents, biological reagents, cosmetics, essences oils, etc. It is suitable for long-term product storage and transportation and has excellent sealing performance.Main features Material: Borosilicate glass Total volume: 8 mL, 12mL Dimensions: 16.6*60 mm, 18.5*65mm Neck: 15-425 screw neck

What are the selection principles for liquid stationary phasesDifferent situations are discussed below To separate polar compounds, use polar Liquid stationary phases. At this time, the interaction between each component of the sample and the molecules of the Liquid stationary phases is mainly directional force and inductive force. The peak order of each component is in the order of polarity. The smaller the polarity, the smaller the peak will appear first. The greater the polarity, the slower the peak will appear. ; To separate non-polar compounds, use non-polar Liquid stationary phases. The intermolecular force between each component of the sample and the Liquid stationary phases is the dispersion force, and there is no special selectivity. At this time, the peaks of each component are in the order of boiling point, and the boiling point is low. peaked first. For the separation of isomers with similar boiling points, the efficiency is very low; When separating a mixture of non-polar and polar compounds, polar Liquid stationary phases can be used. At this time, the non-polar components are distilled out first. The stronger the polarity of the Liquid stationary phases, the easier it is for the non-polar components to flow out; For samples that can form hydrogen bonds. For example, for the separation of alcohol, phenol, amine and water, polar or hydrogen bonding Liquid stationary phases are generally selected. At this time, the separation is carried out based on the hydrogen bonding ability between the components and the Liquid stationary phase molecules."Similar compatibility principle" is the general principle for selecting Liquid stationary phases. When the existing Liquid stationary phases cannot achieve satisfactory separation results, "mixed Liquid stationary phases" are often used, using two or more different properties. Differently, liquid stationary phases mixed in appropriate proportions can achieve satisfactory separation selectivity without prolonging the analysis time.

When conducting complex liquid chromatography analyses, choosing the appropriate HPLC vials is crucial. Considerations include not only the nature of the sample but also ensuring that the vials themselves do not interact with the substances being tested. High-quality HPLC vials not only provide excellent sample protection but also ensure the accuracy and repeatability of experimental results.In your liquid chromatography experiments, choose Aijiren's HPLC vials to ensure optimal sample protection and separation. We offer vials made from high-quality, inert materials to meet all your experimental needs. Trust Aijiren to make your analytical experiments more precise and reliable!

Do you know the injection methods for samplesChromatographic separation requires injecting a certain amount of sample as a "plug" in the shortest possible time. The injection method can be divided into: Gas sampleThere are roughly four sampling methods.(1) Syringe injection(2) Injection into measuring tube(3) Fixed volume injection(4) Automatic gas injection.Syringe injection and Automatic gas injection are commonly used. The advantages of syringe injection are flexible use and simple method, but the disadvantage is poor repeatability of injection volume. Automatic gas sampling uses a quantitative valve to inject samples, which has good repeatability and can be operated automatically. Liquid sampleGenerally, a microsyringe is used for sample injection, which is simple and fast. Quantitative automatic sampling can also be used, which has good repeatability. Solid sampleThe sample is usually dissolved in a solvent and injected using the same method as liquid injection. Solid samplers can also be used to inject samples.

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𝐆𝐚𝐬 𝐂𝐡𝐫𝐨𝐦𝐚𝐭𝐨𝐠𝐫𝐚𝐩𝐡𝐲 𝐭𝐢𝐩𝐬 When you use gas chromatography for analysis, the following methods to improve the degree of separation may help you: Increase the column length, which can increase the resolution; Reduce the injection volume (increase the amount of solvent for solid samples); Improve sampling technology to prevent double injection; Reduce the carrier gas flow rate; Reduce the column temperature; Increase the temperature of the vaporization chamber; Reduce the dead volume of the system. For example, the chromatographic column connection must be inserted in place, and the splitless structure vaporization chamber must be selected for splitless injection; The capillary chromatography column must be split, and an appropriate split ratio should be selected.In summary, exploring experiments according to specific conditions is necessary. For example, lowering the carrier gas flow rate and the chromatographic column temperature will broaden the chromatographic peaks, so the conditions must be changed according to the chromatographic peak shape. The ultimate goal is to achieve sufficient separation and fast peak time.

Why does baseline drift occur when using gas chromatography Baseline drift often occurs when using programmed temperature in GC. This phenomenon is usually caused by the following reasons: column bleed, inlet septa bleed, sampler contamination or detector contamination, and changes in gas flow rate. If a high-sensitivity detector is used, even minor column bleed or system contamination can cause significant baseline drift. In order to improve the reliability of qualitative and quantitative analysis, baseline drift should be reduced or eliminated as much as possible.

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Elevate your lab precision with our Micro Inserts Perfect for autosampler vials, different bottom shapes for choosing, including flat bottom, conical bottom, and conical bottom with polyspring, they ensure maximum sample recovery and easy removal. Suitable for all 1.5ml vials, they relieve syringe pressure feature self-aligning PolySpring inserts, and are compatible with various vial tops, offering versatility. Available in volumes of 150ul, 250ul, 300ul, and dimensions of 5x29mm or 6x31mm – your go-to for accurate and efficient analyses.Contact us to choose the micro insert that best suits your vials！