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<p>Amino-functionalized polydimethylsiloxane (NH<sub>2</sub>-PDMS) was prepared through sol–gel technology and employed as an adsorbent in stirring bar adsorption extraction to assess the levels of free fatty acids (FFAs) in Antarctic krill oil during storage under varying conditions. Fourier-transform infrared spectroscopy confirmed the successful synthesis of NH<sub>2</sub>-PDMS. Under optimal extraction conditions, NH<sub>2</sub>-PDMS effectively extracted FFAs, showing excellent linearity (0.2–1000&#xa0;nmol&#xa0;g<sup>−1</sup>), extremely low limits of detection (0.09–0.46&#xa0;nmol&#xa0;g<sup>−1</sup>), and satisfactory recoveries (77.4–101.8%) and precisions (3.1–9.6%). Compared to traditional solid-phase extraction, this method simplifies the sample pretreatment process and combines separation and enrichment into a single step. Additionally, NH<sub>2</sub>-PDMS can be prepared at normal pressure and low temperature through a simple chemical reaction using common raw materials. Hence, this method offers a promising substitute to conventional techniques for FFA analysis, contributing to the maintenance of oil quality and safety.</p>

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Determination of Free Fatty Acids in Krill Oil during Storage by Stirring Bar Adsorption Extraction Based on Amination of Silicone Gel

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Siyi Wang,
  • Guijie Li,
  • Jinjuan Yang,
  • Shibing Zhang,
  • Min Fu,
  • Qi Zhao

摘要

Amino-functionalized polydimethylsiloxane (NH2-PDMS) was prepared through sol–gel technology and employed as an adsorbent in stirring bar adsorption extraction to assess the levels of free fatty acids (FFAs) in Antarctic krill oil during storage under varying conditions. Fourier-transform infrared spectroscopy confirmed the successful synthesis of NH2-PDMS. Under optimal extraction conditions, NH2-PDMS effectively extracted FFAs, showing excellent linearity (0.2–1000 nmol g−1), extremely low limits of detection (0.09–0.46 nmol g−1), and satisfactory recoveries (77.4–101.8%) and precisions (3.1–9.6%). Compared to traditional solid-phase extraction, this method simplifies the sample pretreatment process and combines separation and enrichment into a single step. Additionally, NH2-PDMS can be prepared at normal pressure and low temperature through a simple chemical reaction using common raw materials. Hence, this method offers a promising substitute to conventional techniques for FFA analysis, contributing to the maintenance of oil quality and safety.