Sample Preparation

SPE cartridge cleanup removing endogenous compounds from plasma samples

SPE Workflow for Removing Endogenous Interferences in Plasma Samples

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1. Types of Endogenous Compounds Interfering in LC-MS Analysis Plasma samples present a complex matrix challenge for LC-MS analysis due to numerous endogenous compounds that can interfere with accurate analyte detection. These interfering substances fall into several key categories: Proteinaceous Components Proteins represent the most abundant endogenous interferents in plasma, comprising approximately 60-80 g/L. Albumin, […]

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mixed mode SPE cartridge used for complex laboratory sample cleanup

Improving Sample Cleanup Efficiency with Mixed-Mode SPE Sorbents

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Principle of Mixed-Mode SPE Interactions Mixed-mode solid phase extraction represents a sophisticated advancement in sample preparation technology that combines multiple retention mechanisms within a single sorbent. According to established literature, mixed-mode SPE columns are prevalent in drug extractions because they offer multiple binding mechanisms for improved sensitivity and excellent sample cleanup. A mixed-mode sorbent employs

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laboratory SPE elution step using solvents during LC-MS sample preparation

Optimizing SPE Elution Solvents for LC-MS Sample Preparation

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1. Importance of Elution Solvent Selection in SPE The elution step represents the culmination of solid-phase extraction (SPE) methodology, where careful solvent selection determines the success of your LC-MS sample preparation. As noted in SPE literature, “Elution is most successfully accomplished with a solvent having the highest eluotropic strength toward the sorbent being used, thereby

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SPE cartridge removing proteins during biological sample preparation

SPE Cleanup Methods for Removing Proteins from Biological Samples

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Sources of Proteins in Biological Samples Biological samples such as plasma, serum, and tissue extracts present significant analytical challenges due to their complex protein composition. Human blood contains approximately 6-8% protein by weight, with plasma and serum being particularly rich in protein fractions that contribute to increased sample viscosity and potential clotting issues. The major

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laboratory SPE cleanup workflow for fatty food samples prior to LC-MS testing

Using SPE for Cleanup of High-Fat Food Samples Prior to LC-MS Analysis

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1. Analytical Challenges in Fatty Food Matrices (Oils, Dairy, Processed Foods) High-fat food matrices present unique analytical challenges that significantly complicate LC-MS analysis. Oils, dairy products, and processed foods contain complex mixtures of lipids including triglycerides, phospholipids, cholesterol esters, and free fatty acids that can range from 5% to over 40% of the total sample

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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

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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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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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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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SPE cartridge cleaning cosmetic sample extract

SPE Sample Cleanup Strategy for Cosmetic Ingredient Analysis

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Analytical Challenges in Cosmetic Formulations Cosmetic ingredient analysis presents unique challenges due to the complex nature of cosmetic formulations. These products typically contain a diverse array of components including oils, waxes, pigments, surfactants, and preservatives that can interfere with analytical measurements. The lipid-soluble nature of many cosmetic ingredients, combined with the presence of emulsifiers and

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HLB SPE cartridge used in metabolomics sample preparation

HLB SPE Sample Preparation Workflow for Metabolomics LC-MS Analysis

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Overview of Metabolomics Workflows and Need for Clean Extracts Metabolomics has emerged as a critical analytical discipline in systems biology, pharmaceutical research, and clinical diagnostics, focusing on the comprehensive analysis of small molecule metabolites in biological systems. The success of any metabolomics study hinges on the quality of sample preparation, particularly when coupled with sensitive

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