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<p>In this work, the optical properties of natural plant pigment chlorophyll are harnessed for the detection of the potentially hazardous polycyclic aromatic hydrocarbon anthracene by observing the variations in the absorption, photoluminescence, and Fourier transform infrared spectra of chlorophyll with the addition of the analyte. A low-cost, environmentally benign approach is employed, utilizing naturally extracted chlorophyll from locally available and inexpensive plant leaves. The principle of sensing is based on the inhibition of chlorophyll's effective absorption due to the inner filter effect provided by anthracene, which consequently reduces the photoluminescence intensity of chlorophyll. A limit of detection as low as 1.77 picomolar (pM) was observed, which is significantly better than reported in many earlier works. The sensing probe showed efficient detection of anthracene for real-life samples as well, collected from areas adjacent to oil exploration sites. This research highlights the importance of environmentally friendly chlorophyll fluorescence as a potential sustainable tool for diverse sensing applications.</p>

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Highly Efficient Fluorescence Sensing of Polycyclic Aromatic Hydrocarbon Anthracene by Chlorophyll

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Siddhartha Protim Bharadwaj,
  • Purabi Gogoi,
  • Chayanika Chetia,
  • Roshmi Pangyok,
  • Mondeep Gohain,
  • Pankaj Dutta

摘要

In this work, the optical properties of natural plant pigment chlorophyll are harnessed for the detection of the potentially hazardous polycyclic aromatic hydrocarbon anthracene by observing the variations in the absorption, photoluminescence, and Fourier transform infrared spectra of chlorophyll with the addition of the analyte. A low-cost, environmentally benign approach is employed, utilizing naturally extracted chlorophyll from locally available and inexpensive plant leaves. The principle of sensing is based on the inhibition of chlorophyll's effective absorption due to the inner filter effect provided by anthracene, which consequently reduces the photoluminescence intensity of chlorophyll. A limit of detection as low as 1.77 picomolar (pM) was observed, which is significantly better than reported in many earlier works. The sensing probe showed efficient detection of anthracene for real-life samples as well, collected from areas adjacent to oil exploration sites. This research highlights the importance of environmentally friendly chlorophyll fluorescence as a potential sustainable tool for diverse sensing applications.