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Related Concept Videos

Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an organic...

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Phenolic Acid Distribution in Wheat Pearling Fractions Using Microwave-Assisted Extraction.

Kemashalini Kirusnaruban1, Nicola Gasparre1, Ruchira Nandasiri1,2

  • 1Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.

Foods (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Controlled pearling of wheat enriches outer layers with phenolic acids, valuable bioactive compounds. Microwave-assisted extraction with water offers an efficient and eco-friendly method for recovery.

Keywords:
microwave-assisted extractionpearled fractionsphenolic acidstotal phenolic contentwheat

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Area of Science:

  • Agricultural Science
  • Food Chemistry
  • Nutraceuticals

Background:

  • Phenolic acids are key bioactive compounds in wheat (Triticum aestivum L.), influencing nutritional and functional traits.
  • Their distribution within the wheat kernel is uneven, with higher concentrations typically found in outer layers.

Purpose of the Study:

  • To investigate the impact of progressive pearling on the distribution of phenolic acids in wheat.
  • To evaluate microwave-assisted extraction (MAE) using water for phenolic acid recovery.

Main Methods:

  • Three wheat varieties were subjected to progressive pearling (5-45% outer layer removal).
  • Phenolic acids were extracted using MAE with water and analyzed via HPLC-DAD.
  • Total phenolic content (TPC) and individual phenolic acids were quantified in different kernel fractions.

Main Results:

  • The 10% pearled fraction (PF100) showed the highest TPC, indicating enrichment in outer bran and sub-aleurone layers.
  • Outer kernel tissues had the highest gallic acid content, while the endosperm had significantly lower levels of various phenolic acids.
  • TPC and individual phenolic acids decreased with increased pearling depth, confirming a clear localization gradient.

Conclusions:

  • Controlled pearling effectively concentrates phenolic acids in specific wheat fractions.
  • MAE with water is an efficient and environmentally friendly method for extracting phenolic acids from wheat.
  • These findings support the development of functional ingredients by optimizing wheat processing for phenolic acid enrichment.