Beta-Glucanase for Grain Biofuel and Barley Ethanol Processing
Improve starch accessibility and reduce mash viscosity in barley-based ethanol fermentation by hydrolysing beta-glucan with a targeted enzyme treatment.
Barley is an important feedstock for first-generation grain ethanol production in regions where it is cost-competitive with corn and wheat, particularly in Northern Europe, Canada, and Australia. However, barley's high beta-glucan content (3–7% dry weight) creates a significant processing challenge in wet-milling and dry-milling ethanol plants. During mashing and liquefaction, beta-glucans from barley cell walls dissolve into the mash, raising viscosity dramatically and creating operational problems that directly affect ethanol yield and plant throughput. High-viscosity barley mash causes cavitation in centrifugal pumps, reduces heat transfer efficiency in heat exchangers and coolers, limits the maximum solids loading achievable without mixing problems, slows separation in decanting centrifuges, and reduces contact between alpha-amylase and starch granules during liquefaction — all of which reduce ethanol yield per tonne of grain processed. Beta-glucanase (EC 3.2.1.6 and EC 3.2.1.4) applied in the mashing or liquefaction step hydrolyses barley beta-glucan into low-molecular-weight fragments, rapidly reducing mash viscosity. This allows higher dry solids loading (improving reactor productivity per unit volume), better alpha-amylase access to starch (improving starch conversion efficiency), and smoother pump and separator operation. In barley ethanol production, beta-glucanase is typically dosed alongside alpha-amylase and protease in the liquefaction step at pH 5.0–6.0 and 50–65°C, or as a pre-treatment in a dedicated 40–50°C mash rest for 15–30 minutes. Commercial ethanol plants report 5–15% improvement in ethanol yield from barley after beta-glucanase treatment, primarily from improved starch accessibility and higher achievable solids loading. Dosage is typically 50–200 g per tonne of barley grain, adjusted to the beta-glucan content of the specific barley variety and the target mash viscosity. Our beta-glucanase is produced from Trichoderma reesei and Aspergillus niger, active at pH 4.0–6.5 and 40–65°C, and supplied at 10,000–100,000 U/g with ISO 9001 certification and full technical documentation.
Barley Mash Viscosity Reduction
Beta-glucanase at 50–150 g/tonne of barley added during mashing or as a pre-treatment rest at 40–50°C for 20–30 minutes reduces mash viscosity from 50–200 cP to below 15 cP, depending on barley variety and solids loading. This allows mixing at higher dry solids (32–35% vs. typical 28–30%), improving reactor productivity per unit volume without additional capital investment in larger vessels.
Improved Alpha-Amylase Starch Conversion
Intact beta-glucan cell walls physically block alpha-amylase access to starch granules in barley endosperm. Beta-glucanase at the pre-liquefaction step dissolves this cell wall barrier, exposing starch granules to alpha-amylase and improving conversion efficiency by 3–8%. In commercial plants where alpha-amylase cost is significant, beta-glucanase pre-treatment can reduce required alpha-amylase dosage while achieving the same DE (dextrose equivalent) in the liquefied mash.
Centrifuge and Separator Throughput
Decanting centrifuges and disc stack separators in barley ethanol plants show significant throughput reductions at high mash viscosity. Beta-glucanase reduces viscosity before centrifugation, improving separation efficiency and reducing centrifuge speed requirements. Plants processing barley report 10–20% improvement in centrifuge throughput at equivalent G-force when beta-glucanase is included in the process enzyme cocktail.
Whole Stillage and Thin Stillage Processing
Residual beta-glucan in whole stillage and thin stillage from barley ethanol production raises viscosity in evaporators and driers, increasing energy consumption and maintenance frequency. Beta-glucanase added to the thin stillage prior to evaporation reduces viscosity, improving heat transfer and reducing fouling on evaporator surfaces. This is increasingly relevant as plants optimize DDGS quality and evaporator efficiency.
| Parameter | Value |
| Activity range | 10,000 – 100,000 U/g |
| Optimal pH | 4.0 – 6.5 |
| Optimal temperature | 40°C – 65°C |
| Form | Light brown to tan powder |
| Shelf life | 12 months (sealed, cool, dry place) |
| Packaging | 25 kg drums / custom packaging |
Frequently Asked Questions
Why is beta-glucanase important in barley ethanol production?
Barley contains 3–7% beta-glucan, which dissolves during mashing and raises mash viscosity dramatically. High viscosity reduces pump efficiency, limits maximum solids loading, slows starch access by amylase, and reduces centrifuge throughput. Beta-glucanase depolymerises these glucan chains, reducing viscosity rapidly and allowing the plant to operate at higher solids loading, better starch conversion, and improved equipment efficiency — translating directly into higher ethanol yield per tonne of barley.
At what stage of ethanol production is beta-glucanase added?
Beta-glucanase is most effective when added early in the process — during the mash preparation step or as a dedicated pre-mash rest at 40–50°C for 15–30 minutes before the main liquefaction step. It can also be co-dosed with alpha-amylase at the beginning of liquefaction (pH 5.0–6.5, 50–65°C), where it reduces viscosity rapidly. Early addition allows maximum contact time with substrate before starch gelatinisation changes the physical properties of the mash.
Can beta-glucanase be used in corn-barley blend mashes?
Yes. Beta-glucanase is particularly effective in barley-corn or barley-wheat blend mashes where barley provides the majority of beta-glucan. Dosage can be proportional to the barley fraction, with corn-dominant mashes requiring much lower beta-glucanase dosing. The enzyme is fully compatible with alpha-amylase, glucoamylase, and protease in standard enzyme cocktails used in grain ethanol liquefaction and saccharification.
What activity grade of beta-glucanase is recommended for ethanol production?
For ethanol production, higher activity grades (50,000–100,000 U/g) are more cost-efficient because they allow lower inclusion mass at equivalent enzyme activity, reducing handling and dosing volumes in large-scale plants. Our 100,000 U/g grade on request is well-suited for commercial ethanol plants processing high volumes of barley. Lower activity grades (10,000–50,000 U/g) are appropriate for pilot-scale trials and smaller plants where handling flexibility is more important than dose volume optimisation.
Request Beta-Glucanase for Barley Ethanol Production
Provide your substrate type, process pH/temperature, and viscosity reduction target. We'll suggest activity grade, dispatch a free 100 g sample with documentation, and quote bulk pricing within 24 hours.
Get Quote