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Abscisic acid studied by fluorescent techniques.

B del Castillo, J Alvarez-Builla, C J Martinez-Honduvilla

    The Italian Journal of Biochemistry
    |November 1, 1977
    PubMed
    Summary
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    A new fluorimetric method was developed to detect abscisic acid (ABA) in P. pinea seed coats. This method utilizes ABA

    Area of Science:

    • Plant Biochemistry
    • Analytical Chemistry

    Background:

    • Abscisic acid (ABA) is a crucial plant hormone regulating various physiological processes.
    • Accurate quantification of ABA is essential for understanding plant responses to environmental stimuli.
    • Existing analytical methods may require significant sample preparation or lack sensitivity.

    Purpose of the Study:

    • To develop a sensitive and specific fluorimetric method for the identification and quantification of abscisic acid (ABA).
    • To apply the developed method for the recognition of ABA inhibitors in *P. pinea* seed coats.

    Main Methods:

    • Crude abscisic acid (ABA) was analyzed for its native fluorescence properties.
    • ABA samples underwent chromatographic purification to enhance fluorescence signals.
    • Oxidation of ABA using a sulfuric acid:ethanol mixture was performed to alter fluorescence characteristics.

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    Main Results:

    • Crude ABA exhibited intrinsic fluorescence at specific excitation and emission wavelengths (λex 340, λem 425 nm).
    • A linear relationship was observed between fluorescence response and ABA concentration (0.04–0.38 µg/mL).
    • Chromatographic purification and chemical oxidation significantly enhanced and shifted ABA's fluorescence emission spectra.

    Conclusions:

    • A robust fluorimetric method for ABA detection and quantification was successfully developed.
    • The method demonstrated utility in identifying ABA inhibitors within *P. pinea* seed coat extracts.
    • This fluorimetric approach offers a sensitive alternative for ABA analysis in plant research.