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Related Experiment Video

Updated: Jun 28, 2026

Quantitative 31P NMR Analysis of Lignins and Tannins
05:57

Quantitative 31P NMR Analysis of Lignins and Tannins

Published on: August 2, 2021

Vanillin-condensed tannin study using flow injection spectrophotometry.

E C Ferreira1, A R Nogueira

  • 1Departamento de Quimica, Universidade Federal de São Carlos, P.O. Box 676, 13560-970 São Carlos SP, Brazil.

Talanta
|October 31, 2008
PubMed
Summary

This study developed a flow injection system for analyzing condensed tannins using the vanillin reaction. The method accurately quantifies tannins in plants like guandu, offering advantages over manual procedures.

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Area of Science:

  • Analytical Chemistry
  • Plant Biochemistry

Background:

  • Condensed tannins are important plant compounds with varying structures.
  • Accurate quantification of condensed tannins is crucial for plant analysis.
  • The vanillin assay is a common method for tannin determination.

Purpose of the Study:

  • To develop and validate a flow injection analysis (FIA) system for the kinetic reaction between vanillin and condensed tannins.
  • To assess the influence of reaction time and tannin polymerization on the assay.
  • To evaluate the FIA method for quantifying condensed tannins in forage legumes, specifically guandu (Cajanus cajan).

Main Methods:

  • Utilized a flow injection system with spectrophotometric detection.
  • Employed (-)-epicatechin as an analytical standard due to its structural similarity to tannin units.

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Last Updated: Jun 28, 2026

Quantitative 31P NMR Analysis of Lignins and Tannins
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Quantitative 31P NMR Analysis of Lignins and Tannins

Published on: August 2, 2021

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

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  • Investigated the time-dependent kinetics of the vanillin-condensed tannin reaction.

    • Main Results:

    • The vanillin-condensed tannin reaction is time-dependent and influenced by the degree of tannin polymerization.
    • The FIA system enabled accurate quantification of condensed tannins in guandu without overestimation.
    • Achieved a high sample throughput (approx. 60 samples/hour) with a low detection limit (1.05 mg/L) and excellent precision (R.S.D. <1%).

    Conclusions:

    • The developed flow injection system provides an efficient and accurate method for determining condensed tannin content.
    • This automated approach offers significant advantages over traditional manual vanillin assays.
    • The method is suitable for analyzing condensed tannins in various plant matrices, including forage legumes.