SPE cartridge workflow removing phospholipids from plasma samples during LC-MS sample preparation

How to Remove Matrix Phospholipids in LC-MS Sample Preparation Using SPE

Leave a Comment / LC-MS Sample Preparation / By /

Why Phospholipids Cause Ion Suppression in LC-MS Analysis Phospholipids represent one of the most significant sources of matrix effects in LC-MS analysis, particularly when dealing with biological samples like plasma and serum. These amphipathic molecules contain both hydrophobic fatty acid chains and hydrophilic phosphate head groups, making them particularly problematic for mass spectrometry workflows. The […]

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Pirani vacuum transmitter mounted on industrial roughing pump line

How to Extend Pirani Sensor Lifespan in Rough Vacuum Applications

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In rough vacuum applications—ranging from vacuum heat treatment furnaces and annealing systems to mass spectrometry roughing stages and scientific instrumentation—the Pirani sensor remains the go-to solution for reliable pressure measurement from atmosphere down to 10⁻³ Torr. The VG-SP205 Pirani Vacuum Transmitter, developed at Poseidon Scientific, uses a platinum filament and precision temperature-compensated circuitry to deliver

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Cold cathode and hot cathode vacuum gauge heads comparison

Cold Cathode vs Hot Cathode: Contamination Resistance Explained

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In high-vacuum and ultra-high-vacuum environments, ionization gauges are the workhorse for pressure measurement below 10⁻³ Torr. Yet when process gases, reactive species, or deposition byproducts are present, gauge contamination becomes a critical concern. Hot-cathode ionization gauges (HCGs) and cold-cathode ionization gauges (CCGs) both ionize gas molecules to produce a measurable current, but they differ dramatically

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SPE cartridge removing chlorophyll pigments from plant extract

SPE Method for Removing Chlorophyll from Botanical Extracts Prior to LC Analysis

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Challenges Posed by Chlorophyll and Plant Pigments in Chromatographic Analysis Chlorophyll and other plant pigments present significant analytical challenges in liquid chromatography (LC) analysis of botanical extracts. These highly colored compounds can cause severe interference through several mechanisms. First, chlorophyll’s strong UV-visible absorption can mask target analyte peaks, particularly when using UV detection at wavelengths

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Pirani vacuum transmitter wired to industrial PLC control panel

How Analog 0-10V Outputs Improve PLC Vacuum Integration

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In today’s automated vacuum systems, programmable logic controllers (PLCs) serve as the central nervous system for process monitoring and control. Whether in mass spectrometry, vacuum heat treatment, or scientific instrumentation, reliable vacuum data must reach the PLC instantly and accurately. While digital protocols offer flexibility, the analog 0-10 V output remains the most widely adopted

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laboratory optimizing SPE wash solvents during sample preparation

Optimizing SPE Wash Steps for Removal of Matrix Interference in Biological Samples

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1. Identification of Common Biological Matrix Interferences Biological samples present unique challenges for solid-phase extraction due to their complex composition. The primary matrix interferences that must be addressed during SPE wash optimization include: Lipids and Phospholipids Lipids represent one of the most significant sources of matrix suppression in LC-MS analysis. These hydrophobic compounds can accumulate

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SPE cartridge extracting antibiotic residues from honey sample

SPE Method for Extraction of Veterinary Antibiotics from Honey

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Honey Matrix Challenges Including High Sugar Content Honey presents unique analytical challenges for veterinary antibiotic residue analysis due to its complex matrix composition. As a natural product with approximately 80% sugar content (primarily fructose and glucose), honey creates significant interference issues for analytical methods. The high viscosity and sugar concentration can lead to: Column fouling

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Cold cathode gauge installed as PTR225N replacement on vacuum system

Why PTR225N-Compatible Cold Cathode Gauges Reduce Replacement Costs

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In high-vacuum coating systems, semiconductor cluster tools, and analytical instruments, the cold-cathode gauge is a critical component for monitoring pressures from 10⁻³ Torr down to 10⁻⁷ Torr. When an original-equipment-manufacturer (OEM) gauge such as the Pfeiffer PTR225N reaches end-of-life, replacement often means purchasing the identical high-priced unit or redesigning the control system. Poseidon Scientific’s VG-SM225

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Vacuum gauge reading displayed during leak detection test

How to Detect Vacuum Leaks Using Pressure Trend Analysis

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In vacuum systems for semiconductor tools, optical coating lines, vacuum furnaces, and analytical instruments, even small leaks can introduce moisture, particles, or reactive gases that ruin substrates or extend pump-down times. Early detection through pressure trend analysis turns reactive troubleshooting into proactive maintenance. The VG-SP205 Pirani Vacuum Transmitter (atmosphere to 10⁻³ Torr) and VG-SM225 Cold

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SPE cartridge purifying cosmetic extract before LC-MS analysis

SPE Cleanup Strategy for LC-MS Analysis of Cosmetic Preservatives

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Common Cosmetic Preservatives: Parabens and Phenoxyethanol Cosmetic formulations present unique analytical challenges due to their complex matrices containing emulsifiers, surfactants, oils, waxes, and various active ingredients. Among the most commonly used preservatives in cosmetics are parabens (methyl-, ethyl-, propyl-, and butyl-paraben) and phenoxyethanol. These compounds serve as antimicrobial agents to prevent microbial growth and extend

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