Fiber-Optic Sensor with a Chitosan/Poly(vinyl alcohol) Cladding for the Determination of Ethanol in Alcoholic Beveragest

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  • KURAUCHI Yoshiaki
    Department of Applied Chemistry, Faculty of Engineering, Oita University
  • YANAI Takayuki
    Department of Applied Chemistry, Faculty of Engineering, Oita University
  • EGASHIRA Naoyoshi
    Department of Applied Chemistry, Faculty of Engineering, Oita University
  • OHGA Kazuya
    Department of Applied Chemistry, Faculty of Engineering, Oita University

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  • Fiber-Optic Sensor with a Chitosan/Poly(vinyl alcohol) Cladding for the Determination of Ethanol in Alcoholic Beverages.

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説明

A fiber-optic sensor having a chitosan/poly(vinyl alcohol) blended membrane as the cladding and a Teflon protective coating was fabricated to determine ethanol in alcoholic beverages. The response was explained on the basis of an increase in the critical angle of the optical fiber by ethanol, which was induced by a shrinkage of the cladding membrane, leading to an increase in the refractive index. Crosslinking of the cladding membrane with glutaraldehyde enhanced the sensor sensitivity in the 0-70v/v% ethanol-content range. The Teflon coating removed interferences from sugars and organic acids commonly present in alcoholic beverages. The response time was within 2min for 50v/v% ethanol and the relative standard deviation was within 1.7% in 20 repeated determinations during a 2-week period. A linear relationship was obtained between the response and the ethanol content in the 0-70v/v% range. The sensor was applied to the determination of ethanol in shochu, sake, wine, whiskey and beer and the results were consistent with the certified values and values obtained by the conventional specific-gravity method.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 10 (1), 213-217, 1994

    社団法人 日本分析化学会

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