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Reducing Heat Without Impacting Quality: Optimizing Trypsin Inhibitor Inactivation Process in Low-TI Soybean.

Ruoshi Xiao¹, Luciana Rosso², Troy Walker¹

¹Department of Food Science and Technology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA.

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|September 13, 2025

Summary

This summary is machine-generated.

Low-trypsin inhibitor (TI) soybeans require less heat processing to improve protein digestibility. This reduces energy use and maintains nutritional quality in soybean meal production.

Keywords:

amino acids protein digestibility soybean meal trypsin inhibitor

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Area of Science:

Agricultural Science
Food Science
Biochemistry

Background:

Soybean meal is a vital protein source, but trypsin inhibitors (TIs) limit its digestibility.
Current thermal processing to inactivate TIs is energy-intensive and can reduce protein quality.

Purpose of the Study:

To evaluate the impact of reduced heat treatment on low-TI soybean cultivars.
To compare protein digestibility and TI levels between high-TI and low-TI soybeans under varying temperatures.

Main Methods:

Soybean samples (high-TI 'Glenn' and low-TI 'VT Barrack') were processed at 60, 80, 100, and 121 °C for 10 minutes.
Analyzed TI concentration, in vitro protein digestibility, and nutritional properties.

Main Results:

100 °C treatment significantly improved protein digestibility and reduced TIs in both soybean varieties.
A negative correlation between protein digestibility and TI concentration was confirmed.
Low-TI soybeans achieved high digestibility at 100 °C, unlike high-TI varieties needing higher temperatures.

Conclusions:

Low-TI soybean cultivars enable effective TI reduction and protein quality preservation with milder heat treatments (100 °C).
This approach offers significant energy savings and cost-effectiveness in soybean meal processing.