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Identifying changes in soybean protein properties during high-moisture extrusion processing using dead-stop

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This summary is machine-generated.

High-moisture extrusion of soybean protein isolate (SPI) causes significant physico-chemical changes. These include denaturation, aggregation, and depolymerization, impacting protein structure and properties.

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Dead-stop operationExtruded meat analogHigh-moisture extrusionProtein propertySoybean protein

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Area of Science:

  • Food Science
  • Protein Chemistry
  • Material Science

Background:

  • Soybean protein isolate (SPI) is a key ingredient in plant-based foods.
  • Understanding its behavior during high-moisture extrusion is crucial for product development.
  • Previous studies have explored extrusion effects, but detailed physico-chemical changes require further investigation.

Purpose of the Study:

  • To investigate the physico-chemical transformations of SPI during high-moisture extrusion.
  • To provide detailed evidence on SPI structural and chemical modifications under extrusion conditions.
  • To elucidate the impact of water, heat, and shear on SPI.

Main Methods:

  • Samples of SPI were collected from different zones of an extruder during a dead-stop operation.
  • Analysis included denaturation enthalpy, extractable protein content, protein subunit content, and average protein molar mass.
  • Changes in secondary structure (beta-sheet ratio) and surface hydrophobicity were also assessed.

Main Results:

  • Denaturation enthalpy and extractable protein were lowest in zone 3 (150°C).
  • Protein subunit content was minimal in zone 4, while average molar mass peaked in zone 3.
  • Extrusion increased beta-sheet content, decreased unordered content, and altered surface hydrophobicity.
  • SPI underwent swelling, denaturation, aggregation, and depolymerization.

Conclusions:

  • High-moisture extrusion significantly alters SPI's physico-chemical properties.
  • The process involves complex changes including denaturation, aggregation, and depolymerization.
  • These modifications are driven by the combined effects of water, heat, and mechanical shear during extrusion.