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A Quick Analysis Method for Protein Quantification in Oilseed Crops: A Comparison With Standard Protocol.

Sapna Langyan1, Rakesh Bhardwaj1, J Radhamani1

  • 1ICAR-National Bureau of Plant Genetic Resources (NBPGR), New Delhi, India.

Frontiers in Nutrition
|June 17, 2022
PubMed
Summary

This study modified the Kjeldahl method for faster protein quantification in oilseed crops. Digesting whole grains instead of flour significantly reduced analysis time without compromising accuracy.

Keywords:
Kjeldahl methoddigestiondistillationflouroilseed cropsprotein quantificationtitrationwhole grain

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Area of Science:

  • Agricultural Science
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate protein quantification is crucial for plant-based food analysis and human health.
  • Existing protein analysis methods, like Kjeldahl, Bradford, and Lowry, face challenges with efficiency and sample preparation, especially for high-oil seeds.
  • Rapid and reliable protein determination methods are needed for oilseed crops.

Purpose of the Study:

  • To develop and validate a modified Kjeldahl method for rapid protein quantification in oilseed crops.
  • To improve sample preparation by using whole grains instead of finely ground flour.
  • To reduce digestion time and minimize sample cross-contamination and oil loss.

Main Methods:

  • Modification of the Kjeldahl method for protein determination in oilseed crops.
  • Direct digestion of whole oilseed grains, bypassing the grinding step.
  • Use of a modified digestion mixture to reduce digestion time and prevent frothing.
  • Statistical validation including ANOVA, Pearson correlation, and paired T-test.

Main Results:

  • The modified method using whole grains showed non-significant differences in protein content compared to the traditional flour matrix across five oilseed crops.
  • The developed method significantly reduced overall analysis time.
  • Statistical validation confirmed the accuracy and reliability of the whole-grain digestion approach.

Conclusions:

  • The novel whole-grain digestion method offers a faster and accurate alternative for protein quantification in oilseed crops.
  • This modification simplifies sample preparation, reduces risks of contamination and oil loss, and enhances analytical efficiency.
  • The validated method provides a reliable approach for routine protein analysis in the oilseed industry.