Which Protease Do I Need: Acid, Neutral or Alkaline?

Choose a protease that works in your process pH range, then compare the quality of the resulting protein hydrolysate. Matching pH is the first filter; solubility, flavour, peptide profile and processing cost determine the final choice.

Begin with the protein and the purpose

Protein hydrolysis can be used to change texture, increase soluble material or develop a particular ingredient. Specify the protein source, pretreatment, solids loading and required endpoint. A protease that performs well on a soluble assay substrate may behave differently on heat-aggregated or poorly dispersed protein.

Use the listed ranges as a shortlist

The current Scientific & Technical listings give pH ranges of 2.3–6.5 for acidic protease, 6.5–8.5 for neutral protease and 7.5–10.5 for alkaline protease. They are screening boundaries, not universal optima. Confirm the current technical data and stability at your temperature and hold duration.

Compare product quality at matched hydrolysis

Different cleavage preferences can produce different peptide mixtures. Equal product volumes, or even the same nominal activity number from different assays, need not produce comparable hydrolysis. Measure a consistent hydrolysis indicator and the functional property that matters. Do not assume that more cleavage always improves flavour or performance.

Account for pH adjustment

A process requiring substantial acid or alkali addition can change salt content, taste and downstream handling. Include these effects when comparing enzymes. Measure pH during treatment, and record the quantity of any titrant added rather than assuming the starting pH remains constant.

Frequently asked questions

Is alkaline protease the strongest option?

There is no universal ranking. Performance depends on protein, conditions and the desired product.

Can I use detergent protease in food?

Select a preparation documented as suitable for the intended food process. Detergent and food grades are not interchangeable.

Troubleshooting

• Protein remains poorly dispersed: assess preparation and pH effects independently of hydrolysis.
• Hydrolysis is high but function is poor: compare earlier endpoints and the finished formulation.

Evidence and scope

These are proposed development comparisons, not validated production recipes or guaranteed performance results. Use current grade-specific technical data for the starting dose and operating conditions. Record the enzyme lot and assay definition, and confirm performance in the finished process before scale-up.

Related technical guides

Why Is My Protein Hydrolysate Bitter? A Protease Trial Guide

How to Design an Enzyme Screening Trial That Gives Useful Results

Process development and supply

Share your feedstock, batch size, temperature and pH profile, treatment time and target specification with Scientific & Technical. Select a relevant product below to see current pack sizes, price and availability, and buy online. For blends and kits, confirm the component selection and conditions against your intended application.

Follow each preparation’s technical and safety data sheets, including storage and handling instructions. Avoid generating enzyme dust or aerosols.