Deep grain processing (maltodextrin, starches, amino acids)

01Overview and value chain

Markers: [EC: Non-GMO traceability & ISO 14040 life-cycle standards | OECD: Food systems & industrial biotechnology | Regulator: FDA (US), EFSA (EU), MARA (China)]

Deep grain processing separates corn or wheat into its component parts (starch, gluten, germ) via wet milling, then hydrolyzes the starch enzymatically into maltodextrin, glucose syrups and fermentation feedstock, ultimately producing B2B ingredients spanning food-grade sweeteners, modified starches for paper and packaging, and fermentation-derived feed amino acids. Cargill and Archer Daniels Midland (ADM) together process a large share of the roughly $18.6 billion 2025 US deep-grain-processing market; ADM’s Q1 2026 results highlighted its Carbohydrate Solutions segment alongside new plant-based ingredient launches (ProFam soy isolates, Arcon soy concentrates) in May 2026. Roquette Freres specializes in wheat deep processing, with its NUTRALYS wheat protein hydrolysate (≥83% protein) and textured wheat protein products serving the plant-based meat sector as of its December 2025 product catalog. Ingredion markets functional native starches such as NOVATION Indulge, a clean-label, non-GMO corn starch for gelling and film-forming applications in dairy and dairy-alternative products. In China, Fufeng Group — one of the world’s largest amino acid producers — raised threonine, lysine and specialty amino acid prices by RMB 100-500 per tonne in March 2026 due to rising raw-material costs, while maintaining leading positions in monosodium glutamate, animal nutrition and xanthan gum; Meihua Holdings reported 2025 full-year revenue of RMB 24.2 billion and net profit of RMB 3.28 billion (+19.72% year-on-year) driven by ramping lysine and isoleucine capacity at its Jilin subsidiary, though Q1 2026 results showed margin pressure from falling amino acid prices, prompting the company to divest its Thailand factory to concentrate capacity.

The key directions of deep grain processing are:

1. Wet milling and fractionation: separating corn or wheat into starch, gluten/protein, germ and fiber fractions via soaking, grinding and centrifugal or membrane separation.
2. Enzymatic starch hydrolysis: converting purified starch into maltodextrin and glucose syrups of varying dextrose equivalent (DE) via sequential alpha-amylase liquefaction and glucoamylase saccharification.
3. Fermentation-derived amino acids: using purified glucose syrup as fermentation feedstock for bacteria (Corynebacterium glutamicum) producing feed-grade lysine, threonine and related amino acids.
4. Functional and modified starches: physically or chemically modifying starch granules for food, paper, textile and biodegradable-packaging applications.

Sectoral value chain

[Grain receiving & steeping] ──> [Wet milling & fractionation] ──> [Enzymatic starch hydrolysis]
                                                                                  │
                                                                     (Amino acid fermentation on glucose syrup)
                                                                                  │
     [B2B ingredient release: food, feed, paper] <──── [Drying, purity testing & certification] <───┘

Value chain levels

Cross-cutting technologies of the sector:

• Alpha-amylase liquefaction: thermostable alpha-amylase (from Bacillus licheniformis) randomly cleaves internal alpha-1,4 bonds in gelatinized starch at 95-105°C, sharply reducing viscosity and converting starch paste into a dextrin mixture.
• Glucoamylase saccharification: glucoamylase (from Aspergillus niger) together with debranching pullulanase sequentially cleaves glucose units from the non-reducing ends of dextrin chains, producing high-purity glucose syrup with dextrose equivalent above 96.
• Corynebacterium glutamicum lysine fermentation: this bacterium ferments purified glucose syrup via the aspartate pathway, secreting L-lysine into the culture broth for downstream membrane ultrafiltration and ion-exchange purification into crystalline feed-grade lysine.

02US

The United States leads global deep grain processing infrastructure, anchored by Cargill and ADM’s integrated corn wet-milling and amino-acid production, supported by USDA import-substitution incentives.

Cargill and ADM’s integrated corn processing, Ingredion’s functional starch portfolio, USDA lysine import-substitution push

• Cargill and ADM: together process a large share of the roughly $18.6 billion 2025 US deep-grain-processing market, with ADM’s Q1 2026 results highlighting its Carbohydrate Solutions segment alongside new plant-based ingredient launches (ProFam soy isolates, Arcon soy concentrates) in May 2026.
• Ingredion: markets functional native starches such as NOVATION Indulge, a clean-label, non-GMO corn starch for gelling and film-forming applications in dairy and dairy-alternative products.
• USDA import-substitution incentives: federal support for domestic feed-amino-acid (lysine, threonine) production capacity in the Corn Belt aims to reduce US dependency on Chinese amino-acid imports.

03CN

China dominates global amino acid production through ultra-large-scale fermentation facilities, while navigating a 2026 market downturn in amino acid prices even as capacity continues to expand.

Fufeng Group’s March 2026 price increase, Meihua Holdings’ capacity ramp-up amid margin pressure, green-chemistry mandates

• Fufeng Group: one of the world’s largest amino acid producers, raised threonine, lysine and specialty amino acid prices by RMB 100-500 per tonne in March 2026 due to rising raw-material costs, while maintaining leading domestic positions in monosodium glutamate, animal nutrition products and xanthan gum.
• Meihua Holdings: reported 2025 full-year revenue of RMB 24.2 billion and net profit of RMB 3.28 billion (+19.72% year-on-year) driven by ramping lysine and isoleucine capacity at its Jilin subsidiary, though Q1 2026 results showed sharp margin pressure (net profit down 88.42% year-on-year) from falling amino acid prices, prompting the company to divest its Thailand factory to concentrate global capacity.
• Green-chemistry mandates: China’s 14th Five-Year Plan requires deep-grain-processing plants to adopt closed-loop water systems and reduce chemical-oxygen-demand emissions, driving investment in membrane-filtration lines that recover valuable gluten protein from wastewater streams.

04EU

The European Union’s deep grain processing focuses on wheat fractionation for plant-based protein and non-GMO-verified, traceable ingredient supply chains.

Roquette’s wheat protein leadership, non-GMO traceability requirements, life-cycle-assessment standards

• Roquette Freres: specializes in wheat deep processing, with its NUTRALYS wheat protein hydrolysate (≥83% protein) and textured wheat protein products serving the plant-based meat sector as of its December 2025 product catalog, alongside GLUCIDEX maltodextrin.
• Non-GMO traceability: EU consumer demand requires full grain supply-chain traceability, with raw material verified non-GMO (Non-GMO Project equivalent) and confirmed via PCR testing of each batch.
• Life-cycle-assessment standards: European starch plants increasingly apply ISO 14040 life-cycle-assessment methodology to minimize the carbon footprint of processing operations, supporting export credibility for modified starches used in biodegradable packaging.

05Leading companies and research institutes

06Tech stack and innovations

The deep grain processing stack combines mechanical fractionation with sequential enzymatic and fermentation biocatalysis:

1. Cascading enzymatic starch hydrolysis:
   • Thermostable alpha-amylase liquefies gelatinized starch at 95-105°C by randomly cleaving internal alpha-1,4 bonds, then glucoamylase and debranching pullulanase sequentially cleave glucose units from dextrin chains at 60°C, producing glucose syrup with dextrose equivalent above 96.
2. Maltodextrin DE classification:
   • Maltodextrin, a partial starch hydrolysis product with dextrose equivalent (DE) between 3 and 20, is engineered for specific functional properties: low DE (5-10) gives a thick, strong film-forming texturizer with minimal sweetness, while high DE (15-20) gives high solubility and moderate sweetness.
3. Wet wheat fractionation:
   • Ground wheat dough is washed over rotating screens, separating raw starch milk from the elastic, insoluble gluten protein, which is then dewatered on vacuum filters and gently dried in ring flash dryers at low temperature to prevent protein denaturation.

07Value chains and production pipelines

Industrial pipeline for producing crystalline maltodextrin and feed-grade lysine at an FSSC 22000-certified corn plant

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Steeping & corn germ    │ ───> │ 2. Starch & gluten          │
│    separation                   │      │    isolation                    │
└───────────────────────────┘      └───────────────────────────┘
                                                 │
                                                 ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Maltodextrin drying &    │ <─── │ 3. Enzymatic starch        │
│    packaging                    │      │    liquefaction (jet cooker)    │
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. L-lysine fermentation   │ ───> │ 6. Lysine isolation, HPLC  │
│    (Corynebacterium)           │      │    testing & packing            │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Steeping and corn germ separation

Corn kernels are steeped in water with 0.2% SO2 at 50°C for 48 hours, then coarsely ground on disc mills, with the lighter germ fraction separated on hydrocyclones for oil extraction.

Stage 2: Starch and gluten isolation

The degermed corn mash is finely ground, fiber is separated on curved screens, and starch and gluten protein are separated on high-speed centrifuges, with the dewatered corn gluten (over 60% protein content) dried for feed markets.

Stage 3: Enzymatic starch liquefaction (jet cooker)

A 35%-solids starch slurry is treated with alpha-amylase and heated to 105°C under 6 bar pressure via jet cooker, then held in a tubular reactor for two hours to produce a DE-15 dextrin.

Stage 4: Maltodextrin drying and packaging

The dextrin syrup is filtered through membrane filter presses, decolorized with activated carbon and ion-exchange demineralized, then spray-dried into finished maltodextrin powder.

Stage 5: L-lysine fermentation (Corynebacterium)

A portion of the glucose syrup is directed to a 100 m³ fermenter as carbon feedstock, inoculated with Corynebacterium glutamicum and fermented for 72 hours with ammonia water feed maintaining pH 7.0 and supplying nitrogen.

Stage 6: Lysine isolation, HPLC testing and packing

The fermentation biomass is ultrafiltered and concentrated by evaporation, lysine is crystallized in vacuum crystallizers and fluid-bed dried, purity-tested by HPLC, then aseptically packed into 25 kg valve bags.