The science behind high-purity starch plant protein extraction & how to achieve it

The primary challenge in the plant protein industry, especially when working with starch plants like peas, faba beans, mung beans and lentils, is extracting high-purity protein isolates (>90%) with consistent functionality, such as solubility, gel formation and emulsification properties, while keeping production processes resource-efficient and cost-effective.

This is where advanced technologies, like Flottweg’s decanters, Sedicanter® and belt presses, come into play. These solutions are built to handle the most pressing issues in protein production while optimizing protein extraction to maximize the value of byproducts & reducing resource consumption.

Why is high-purity plant protein so important and how hard is it to achieve?

Producing high-purity plant protein isolates from starch plants like peas, faba beans, mung beans and lentils is a demanding process that requires precision and efficiency. The challenge lays in extracting & processing the protein with consistent quality, functionality and scalability. Here are some of the key obstacles manufacturers face when targeting protein isolates with over 90% purity:

1. Balancing purity with yield

Achieving high protein purity often comes at the expense of overall yield. The more refined the separation process, the greater the risk of protein loss. Manufacturers must strike a delicate balance between maximizing yield and maintaining the desired level of purity.

2. Preserving functional properties

High-purity protein isolates must retain their natural functionality – solubility, emulsification and gel formation – for use in premium applications like plant-based meat and dairy alternatives. Harsh extraction methods or poorly calibrated processes can damage these properties, reducing the protein’s market value.

3. Dealing with raw material variability

The protein content and quality of raw materials like peas and lentils can vary significantly based on crop conditions, regional differences and storage methods. This variability complicates the extraction process, making it challenging to maintain consistent product quality across batches.

4. Minimizing contamination and impurities

To meet food-grade standards, even trace impurities in protein isolates can render the product unsuitable for premium markets. Efficient separation of starch, fibers and other residues is critical to achieving the highest levels of purity.

5. Managing coagulation and separation efficiency

The coagulation phase, where proteins are precipitated and isolated, requires precise pH control and optimal equipment performance. Inefficient systems can result in incomplete separation, leading to lower purity and wasted resources.

Why it all matters: High-purity plant protein isolates are essential for the ever-expanding plant-based food industry. Achieving this level of quality allows manufacturers to deliver proteins that meet really strict standards while minimizing resource use and waste. Flottweg’s solutions tackle these issues head-on, helping manufacturers consistently achieve exceptional purity, functionality and efficiency.

Flottweg solutions for starch plant protein extraction

1. Customized processes for maximum yield and purity

Flottweg offers both individual machines and complete turnkey systems for plant protein production. These systems extract protein with purity levels of over 90%, ensuring high-quality isolates suitable for the food industry. By adapting equipment configurations to specific crops and production needs, Flottweg machines allow maximum yield and efficiency at every stage.

• Multi-stage extraction and coagulation processes ensure protein purity and functionality.

• Gentle handling during extraction maintains native protein properties like solubility and gel formation.

• Modular designs allow production capacities to range from 200-20,000kg/hour to 441-44,100 kg/hour.

2. Advanced centrifuge technology

Flottweg’s decanters and Sedicanter® centrifuges allow the separation of the individual components of the starch plants – protein, fibers and starch – from each other and thus enable the option to be marketed separately.

Decanters:

• Separate dissolved proteins from solids in the initial extraction phase.

• Handle high solid loads efficiently, reducing energy and water consumption.

Sedicanter®:

• Specifically designed for challenging protein isolate separations.

• Combines the capabilities of a decanter and separator, achieving exceptional purity and maintaining protein functionality.

3. Byproduct management

Starch extraction from plants like peas and lentils generates valuable byproducts, including fibers and proteins, which can be refined into secondary products to maximize resource utilization and profitability. Flottweg’s belt presses and nozzle separators play a critical role in managing these byproducts efficiently and sustainably.

• Fibers: After separating starch, Flottweg’s belt presses dewater the remaining fibers, preparing them for use as high-value animal feed or as raw materials for industrial applications.

• Proteins: Flottweg’s Sedicanter® enables the recovery of proteins during starch extraction, turning them into functional isolates suitable for food-grade or feed-grade applications.

• Starch: The primary output, starch, undergoes purification using Flottweg’s nozzle separators, ensuring it meets the highest food-grade quality standards for applications in food, pharmaceuticals, and industrial uses.

4. Sustainability and resource optimization

Flottweg technologies are built with environmental responsibility in mind, integrating energy-efficient designs and water recycling systems to minimize waste.

• Reduced water usage through efficient recycling during extraction processes.

• Optimized energy consumption with features like the Simp Drive® gearbox.

• Virtually zero waste streams as all raw material components are utilized.

With yields exceeding 75% and purity levels above 90%, Flottweg ensures exceptional functionality while maintaining sustainability and cost-efficiency.

Whether you’re producing protein isolates, concentrates or utilizing byproducts like starch and fibers, Flottweg machines transform starch plant processing into an efficient, profitable and environmentally friendly operation. Contact us for an audit.