High-Protein Snack Development via Direct Expansion Extrusion Process Optimization

Overview

This research platform focuses on developing high-protein puffed snacks through Direct Expansion (DX) extrusion processes. The approach addresses a key challenge in extruded snack manufacturing: controlling product texture by managing the expansion of the extrudate. By characterizing the glass transition temperature (Tg) and viscoelasticity of the melt under simulated extrusion conditions, the platform enables prediction and optimization of DX product properties. The goal is to create melt compositions with high plant protein and starch content that expand as effectively as systems enriched with whey proteins, opening new possibilities for nutritious, high-protein snack products.

Technical specifications

Key research capabilities:

• High-pressure rheometer cell for measuring melt rheological properties under simulated extrusion conditions, enabling characterization of glass transition temperature and viscoelasticity without extrusion artifacts
• Ingredient screening methodology to identify formulations delivering desirable viscoelasticity properties for expansion
• Protein modification techniques, including hydrolysis and surface hydrophilicity enhancement, to strengthen interactions between plant proteins and starch
• Compatibility analysis between starch and proteins to optimize DX product texture
• Machine learning and probabilistic data analysis tools to quantify the impact of process parameters and system variables on final product quality
• Established analytical methods for evaluating protein chemistry, protein-protein and protein-starch interactions, and DX product quality attributes

Target applications:

• High-protein puffed snacks with improved nutritional profiles
• Plant-protein-enriched extruded products
• Expanded product lines leveraging alternative protein sources such as cowpea and other plant proteins

Technology readiness level

This research is at an early-to-mid development stage, building on validated findings that starch type influences melt rheology and expansion, and that molecular dispersion of fibers in starch phases provides textural benefits. Prior work has demonstrated expansion of DX products with high whey protein content using both CO2-assisted and conventional extrusion methods. Future validation will involve systematic ingredient screening, protein modification studies, and application of machine learning models to predict and optimize product outcomes. The platform is positioned for collaborative development with industry partners interested in advancing high-protein extruded snack technology.