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Solid Phase Extraction (SPE) plays a foundational role in analytical chemistry by isolating specific compounds from mixtures prior to laboratory analysis. It improves accuracy in toxicology, pharmaceutical quality control, clinical diagnostics,

food safety testing, environmental water evaluation, and forensic examination. As analytical instruments such as LC-MS/MS and GC-MS become more sophisticated, sample-purification standards rise, making SPE a critical bridge between raw samples and clean analytical readiness.

SPE employs adsorbent-packed cartridges or disks through which liquid samples pass. Analytes bind to the stationary phase while impurities wash away. Key steps include conditioning, sample loading, washing, and elution. Sorbent chemistry selection—reversed-phase, normal-phase, ion-exchange, or mixed-mode—determines extraction success. Polymer-based, silica-based, and carbon sorbents allow precise matching with sample properties.

Automation has transformed SPE workflows. Robotic systems handle high-throughput extraction for pharmaceutical screening and environmental monitoring laboratories. Micro-SPE and dispersive SPE provide alternatives for low-volume samples and rapid processing. Miniaturized sorbent formats and SPE…