Acid Protease
Bulk Enzyme for Brewing, Distilling, Feed & Protein Hydrolysis
Wholesale acid protease from Aspergillus niger for distilleries, breweries, feed mills, hydrolysate and seasoning manufacturers, and the distributors who supply them. Available in 25 kg drums, activity 50,000–100,000 U/g, optimal pH 2.0–5.0, 30–50 °C. Ships globally to 80+ countries. Request a free 100 g trial with COA to validate in your process before bulk order.
Years experience
Countries shipped
ISO
Acid Protease Enzyme Powder
50,000 – 100,000 U/g
Applications
Bulk acid protease for businesses that buy by the drum: distilleries and fuel-ethanol plants, breweries, feed mills and premix companies, hydrolysate and seasoning manufacturers, tanneries, and the distributors who serve them. Choose your application and request a quote.
Alcohol & Spirits
Releases amino nitrogen from grain protein in acidic mashes, so yeast is better fed. For baijiu, whisky, grain spirit and fuel-ethanol plants; dose is set from your grain bill in a trial.
Learn more →Brewing
Breaks down the protein fractions behind chill haze and raises wort amino nitrogen in high-adjunct brewing. For breweries and brewing-ingredient distributors; dose is set on your own grist.
Learn more →Animal Feed
Active at the low pH of the stomach and proventriculus, supporting protein digestibility in poultry and swine diets. For feed mills, premix and feed-additive companies.
Learn more →Protein Hydrolysis
Produces peptides and free amino acids from soy, pea, whey, and collagen at pH 3.0–4.5 and 45 °C for controlled hydrolysate manufacturing.
Learn more →Soy Sauce & Seasonings
Accelerates moromi-stage protein breakdown in koji-based soy sauce and miso production. Supports umami development and can shorten maturation timelines in controlled fermentation lines.
Learn more →Leather Processing
Supports bating and dehairing at acidic pH, helping reduce reliance on harsher chemical treatments. Suitable for cleaner grain surface control and lower effluent burden.
Product Specifications
| Enzyme Name | Acid Protease (EC 3.4.23.18) |
| Activity | 50,000 – 100,000 U/g |
| Optimal pH | 2.0 – 5.0 |
| Optimal Temperature | 30°C – 50°C |
| Appearance | Light yellow to brown powder |
| Source | Aspergillus niger |
| Shelf Life | 12 months (sealed, cool, dry place) |
| Packaging | 25 kg fiber drums / custom packaging |
| MOQ | 25 kg |
| Certifications | ISO 9001, HALAL, KOSHER, Food Grade |
Why Source From Us
Low-pH stability
Aspergillus niger–sourced acid protease remains active across pH 2.0–5.0, delivering reliable performance in acidic fermentations and other low-pH workflows.
Complete documentation
Each batch ships with COA, TDS, ISO 9001, HALAL, KOSHER, and Food Grade statements to simplify QA and export compliance in 80+ markets.
Tailored activity grades
Select 50,000 U/g for feed or 100,000 U/g for concentrated hydrolysis, brewing, distilling, and condiment processes requiring precise dosing.
Small MOQ & global supply
MOQ from 25 kg with 12-month shelf life and worldwide logistics. Trial quantities available for validation before full-scale procurement.
Frequently Asked Questions
What is acid protease and what does it do?
Acid protease is a low-pH endoprotease that hydrolyses peptide bonds, converting proteins into peptides and amino acids. Industrial users apply it in acidic mashes, fermentations, feed lines, and hydrolysis plants.
What is the EC number of acid protease?
EC 3.4.23.18. Classified as an aspartic-type endoprotease with acidic process suitability.
What's the difference between acid protease, neutral protease, and alkaline protease?
Acid protease works at pH 2–5, neutral protease near pH 6–7, alkaline protease above pH 8. Selection depends on substrate, process pH, and performance needs.
Is acid protease the same as aspartic acid protease?
Yes, both terms describe enzymes with a catalytic mechanism involving two aspartate residues for stable activity in acidic environments.
How much acid protease do I dose in a baijiu or whisky mash?
It depends on grain bill, solids, pH and temperature, so there is no single figure that transfers between plants. Share your process data and we will propose a starting dose for a trial on your own mash.
Is your acid protease food grade, HALAL, and KOSHER?
Yes, supplied with Food Grade, HALAL, and KOSHER documentation plus COA and TDS for QA and procurement.
What's the optimal pH and temperature for acid protease?
Optimal pH 2.0–5.0 and 30–50 °C, matching acidic fermentation, low-pH mashing, and controlled hydrolysis conditions.
How do I request a free sample and COA?
Complete the contact form with application, substrate, pH, and batch size. We will send a free 100 g sample with COA and quote bulk supply within 24 h.
Get a Free Sample & Quote
For manufacturers, distributors and resellers: tell us the product or grade, the quantity, your application and the destination country. Provide substrate type, process pH and temperature, and desired hydrolysis outcome. We’ll recommend grade (50k or 100k U/g), ship a 100 g trial with COA, and quote for 25 kg drums within 24 h.
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