comparison of HLB and MAX SPE cartridges

Choosing Between HLB and MAX SPE for Acidic Drugs

Chemical Properties of Acidic Pharmaceuticals Acidic pharmaceuticals represent a diverse class of compounds characterized by their ability to donate protons in aqueous solutions. These drugs typically contain carboxylic acid (-COOH), sulfonic acid (-SO3H), or phenolic hydroxyl (-OH) functional groups that can dissociate to form negatively charged species. Understanding their chemical properties is fundamental to selecting […]

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Industrial vacuum gauges installed on production line

Vacuum Gauge MTBF: What Reliability Metrics Should You Track?

Define MTBF in Industrial Context Mean Time Between Failures (MTBF) quantifies the average operating hours a vacuum gauge can deliver before requiring replacement or major service. In industrial vacuum applications—mass spectrometers, vacuum furnaces, PVD coating lines, battery dry rooms, and electron-beam systems—MTBF is not a laboratory ideal but a practical reliability metric tied directly to

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SPE cleanup before LC MS analysis

LC-MS Matrix Effect Reduction Using SPE Cleanup

Sources of LC-MS Matrix Effects Liquid chromatography-mass spectrometry (LC-MS) has revolutionized analytical chemistry with its exceptional sensitivity and specificity, but it remains vulnerable to matrix effects that can compromise analytical accuracy. Matrix effects in LC-MS refer to the suppression or enhancement of analyte ionization caused by co-eluting components from the sample matrix. These effects are

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Vacuum gauge mounted on plasma sputtering chamber

How Plasma Processes Influence Vacuum Gauge Readings

Plasma Density Effect on Ionization Gauges In plasma-enhanced processes such as reactive sputtering, PECVD, and plasma etching, the vacuum chamber contains a dense cloud of ions, electrons, and excited neutrals. This external plasma directly influences ionization-type vacuum gauges because their measurement principle already relies on electron–molecule collisions to generate a measurable ion current. The VG-SM225

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endocrine disruptor extraction using SPE

SPE Sample Preparation for Endocrine Disruptor Analysis

Overview of Endocrine Disrupting Compounds Endocrine disrupting compounds (EDCs) represent a diverse class of chemical contaminants that interfere with the normal functioning of the endocrine system in humans and wildlife. These compounds mimic, block, or otherwise disrupt hormonal signaling pathways, potentially leading to reproductive abnormalities, developmental disorders, and increased cancer risks. EDCs encompass a wide

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Vacuum gauge installed on industrial metal 3D printer chamber

Vacuum Monitoring in Additive Manufacturing Systems

Vacuum-Assisted Metal Printing Requirements Additive manufacturing of metal parts—particularly electron-beam melting (EBM) and vacuum-assisted laser powder-bed fusion—relies on controlled vacuum environments to eliminate oxidation, improve melt-pool stability, and ensure defect-free microstructures. Build chambers must reach and hold pressures low enough to prevent oxygen and nitrogen pickup while still allowing efficient powder spreading and electron or

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Vacuum gauge calibrated at atmospheric pressure

Vacuum Gauge Zero Offset Adjustment Procedure

When Zero Adjustment Is Required Zero offset in vacuum transmitters refers to a systematic shift where the gauge reads a non-zero pressure at true atmosphere (≈760 Torr) or fails to approach zero at base vacuum. For Poseidon Scientific’s VG-SP205 Pirani Vacuum Transmitter and VG-SM225 Cold Cathode Vacuum Gauge, such offsets are rare thanks to factory

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environmental water pharmaceutical extraction using SPE

SPE Preconcentration of Pharmaceuticals in Surface Water

Pharmaceutical Contaminants Overview Pharmaceutical contaminants in surface water represent a growing environmental concern, with compounds ranging from non-steroidal anti-inflammatory drugs (NSAIDs) to antibiotics, hormones, and antidepressants entering aquatic systems through various pathways. These emerging contaminants typically exist at trace concentrations (ng/L to μg/L), making their detection and quantification challenging without effective preconcentration techniques. According to

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Cold cathode vacuum gauge on electron beam vacuum chamber

High Vacuum Measurement in Electron Beam Systems

Required Pressure Levels (10⁻⁵ mbar Region) Electron beam systems—scanning electron microscopes (SEM), electron-beam lithography tools, e-beam welding machines, and high-resolution analytical instruments—operate in the high-vacuum regime to ensure electrons travel in straight-line paths without scattering. At pressures above ~10⁻³ mbar (~7.5×10⁻⁴ Torr), the mean free path of residual gas molecules drops below chamber dimensions, causing

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plasma phospholipid cleanup using SPE

Removing Phospholipids from Plasma Using SPE

Phospholipid Interference in LC-MS Analysis Phospholipids represent one of the most significant challenges in liquid chromatography-mass spectrometry (LC-MS) analysis of biological samples, particularly plasma. These endogenous compounds can cause severe matrix effects, leading to ion suppression or enhancement, increased analytical variability, and reduced method sensitivity. According to Waters documentation, phospholipids are “major causes of matrix

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