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<p>Several organic polymers and sol-gel derived porous silica were investigated as cladding material of a fused silica optical fiber as well as a solid phase microextraction (SPME) material in an effort to develop an evanescent wave optical fiber chemical sensor (EW-OFCS) for detecting acetylsalicylic acid (ASA) in aqueous sample solutions. A dip-coating method was adopted for coating a polymer on the fiber core surface of a bent optical fiber probe (BOFP) as a cladding/SPME membrane. Among the polymers investigated, it was found that cellulose triacetate (CTA) can function as a SPME material for concentrating ASA from aqueous sample solution into CTA membrane coated on BOFP surface. The ASA concentrated into the CTA membrane was detected by passing a light beam through the BOFP and detecting the fiber optic EW absorption signal at ASA’s intrinsic peak absorption wavelength (310 nm). No chemical reaction was involved in the developed sensor and no chemical reagent is needed in using the sensor for detecting ASA in an aqueous sample solution. The sensor response is reversible because SPME is a reversible process. This SPME-EW-OFCS achieved a detection limit of 0.72 µg/mL for detecting ASA in aqueous sample solutions. The sensor has been used for analyzing ASA in pharmaceutical Aspirin products, and obtained analytical results agree well with a conventional UV/Vis absorption spectrometric method.</p>

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An Optical Fiber Acetylsalicylic Acid Sensor Using a Cellulose Triacetate Cladding on Fiber Core Surface for Solid Phase Extraction

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Jason D. McCaslin,
  • Josiah W. Miller,
  • Shiquan Tao

摘要

Several organic polymers and sol-gel derived porous silica were investigated as cladding material of a fused silica optical fiber as well as a solid phase microextraction (SPME) material in an effort to develop an evanescent wave optical fiber chemical sensor (EW-OFCS) for detecting acetylsalicylic acid (ASA) in aqueous sample solutions. A dip-coating method was adopted for coating a polymer on the fiber core surface of a bent optical fiber probe (BOFP) as a cladding/SPME membrane. Among the polymers investigated, it was found that cellulose triacetate (CTA) can function as a SPME material for concentrating ASA from aqueous sample solution into CTA membrane coated on BOFP surface. The ASA concentrated into the CTA membrane was detected by passing a light beam through the BOFP and detecting the fiber optic EW absorption signal at ASA’s intrinsic peak absorption wavelength (310 nm). No chemical reaction was involved in the developed sensor and no chemical reagent is needed in using the sensor for detecting ASA in an aqueous sample solution. The sensor response is reversible because SPME is a reversible process. This SPME-EW-OFCS achieved a detection limit of 0.72 µg/mL for detecting ASA in aqueous sample solutions. The sensor has been used for analyzing ASA in pharmaceutical Aspirin products, and obtained analytical results agree well with a conventional UV/Vis absorption spectrometric method.