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Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

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Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Related Experiment Video

Updated: Jun 3, 2025

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
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4D-printed programmable sample-/eluent-actuated solid-phase extraction device for trace metal analysis.

Chia-Hsun Kuo1, Cheng-Kuan Su1

  • 1Department of Chemistry, National Chung Hsing University, Taichung City, 402202, Taiwan, ROC.

Analytica Chimica Acta
|January 9, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel 4D-printed device for automated solid-phase extraction (SPE). The 4D-printed valves control sample flow, enabling efficient metal ion analysis with high sensitivity.

Keywords:
Four-dimensional printingNeedle valveSolid-phase extractionStimuli-responsive materialThree-dimensional printingTrace metals

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Integrating valves, manifolds, and SPE columns into a compact device presents significant fabrication challenges.
  • Four-dimensional printing (4DP) offers advanced capabilities for creating stimuli-responsive analytical devices with programmable shape-changing functions.
  • The application of 4D-printed valves for flow control in SPE remains underexplored.

Purpose of the Study:

  • To develop and demonstrate a novel 4D-printed device for automated solid-phase extraction (SPE).
  • To utilize stimuli-responsive materials and 4DP for creating programmable flow control valves.
  • To simplify and automate conventional SPE procedures for metal ion analysis.

Main Methods:

  • Digital light processing 3D printing (3DP) was used with photocurable resins, including CEA-incorporated flexible resins.
  • Two [H+]-responsive flow-actuated needle valves were fabricated and integrated with an SPE column.
  • The valves operate based on the swelling and deswelling of a stem in response to pH changes.

Main Results:

  • A semi-automatic SPE scheme was successfully developed for analyzing Mn, Co, Ni, Cu, Zn, Cd, and Pb ions.
  • The device demonstrated competitive performance when coupled with inductively coupled plasma mass spectrometry (ICP-MS), with detection limits from 0.5 to 5.9 ng/L.
  • The method's reliability was validated using certified reference materials and spike analyses in natural water and urine samples.

Conclusions:

  • This work represents the first demonstration of an SPE scheme automated by programmable actuation of 4D-printed stimuli-responsive valves.
  • The study highlights the analytical potential of tunable 4D-printed components.
  • 4DP technologies show significant promise for advancing conventional sample pretreatment devices.