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Microwave-Assisted Extraction of Phenolic Compounds and Antioxidants for Cosmetic Applications Using Polyol-Based Technology
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Microwave-Assisted Extraction of Phenolic Compounds and Antioxidants for Cosmetic Applications Using Polyol-Based Technology

Published on: August 23, 2024

Soil microbial communities respond differently to three chemically defined polyphenols.

Michael A Schmidt1, Allison J Kreinberg, Javier M Gonzalez

  • 1Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, USA.

Plant Physiology and Biochemistry : PPB
|April 3, 2013
PubMed
Summary

Soil polyphenols like tannins impact microbial communities. While methyl gallate and epigallocatechin gallate altered microbial populations, none of the tested polyphenols significantly affected ammonia oxidizers or supported growth.

Keywords:
AOAAOBAOXAmmonia oxidizing speciesCLPPCommunity level physiological profiling (CLPP)DGGEDenaturing gradient gel electrophoresis (DGGE)EGCgMicroresp™R(0)Soil nitrogen cycleTanninammonia monooxygenase geneammonia-oxidizing archaeaammonia-oxidizing bacteriaamo-Acommunity level physiological profilingdenaturing gradient gel electrophoresisepigallocatechin gallateqPCRreal time quantitative polymerase chain reactionstarting fluorescence

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Area of Science:

  • Soil microbiology
  • Environmental chemistry
  • Plant-soil interactions

Background:

  • High molecular weight polyphenols, such as tannins, can influence soil microbial communities by acting as substrates or selective agents.
  • Understanding polyphenol fate and effects is crucial for soil health and ecosystem function.

Purpose of the Study:

  • To investigate the respiration of three phenolic compounds by soil microorganisms.
  • To assess the impact of these compounds on the abundance and diversity of soil bacteria and archaea, including ammonia oxidizers.

Main Methods:

  • Incubation of acidic silt loam soil with methyl gallate, epigallocatechin gallate, or oenothein B for two weeks.
  • Measurement of polyphenol respiration using the Microresp™ system.
  • Analysis of metabolic and genetic diversity via community level physiological profiling (CLPP) and denaturing gradient gel electrophoresis (DGGE).
  • Quantification of total and ammonia-oxidizing microbial populations using real-time quantitative polymerase chain reaction (qPCR).

Main Results:

  • Methyl gallate was respired more effectively than higher molecular weight tannins but less than glucose.
  • Methyl gallate and epigallocatechin gallate induced unique genetic and physiological microbial populations compared to glucose.
  • No tested polyphenols supported microbial growth or altered ammonia-oxidizing bacterial or archaeal populations.

Conclusions:

  • Polyphenols exhibit varying degrees of microbial respiration, with monomeric forms being more readily utilized.
  • Certain polyphenols can select for distinct microbial communities, influencing soil microbial ecology.
  • Further research with diverse polyphenols and soil types is necessary to fully understand their role in soil microbiology.