Enzyme Explorer · Food & fermentation
Lactase
Develop lactose hydrolysis for dairy and selected ingredient processes, with residual lactose measured against your required specification.
01 / Understand the chemistry
How does lactase work?
β-Galactosidase hydrolyses lactose to glucose and galactose. Selected enzymes can also catalyse transgalactosylation under suitable conditions. Acid-active and neutral lactase grades can have different process uses.
Match the dairy conditions
pH, temperature and treatment time determine which enzyme grade is suitable.
Process schematic · symbols represent substrates and products, rather than an atom-by-atom chemical structure.
02 / Select by outcome
Lactase applications in industry and research
Start with the result you need, then choose the enzyme grade and the measurement.
Reduce lactose in a defined product.
MEASURE SUCCESSMeasure residual lactose, sweetness and storage outcome.
PROCESS DECISIONCheck enzyme grade, microbiological controls and the process stage.
Convert lactose in a whey-derived stream.
MEASURE SUCCESSMeasure lactose and individual sugar concentrations.
PROCESS DECISIONConsider salt, solids and substrate concentration.
Compare hydrolysis and transgalactosylation.
MEASURE SUCCESSMeasure lactose, monomers and oligosaccharides separately.
PROCESS DECISIONA single glucose readout may not resolve all product pathways.
03 / Methods & measurement
How to measure lactase activity
ONPG is a convenient model substrate for β-galactosidase. Confirm dairy performance using lactose and a validated lactose method or chromatography.
Make a better selection
What matters when choosing a grade?
The E. coli structural example illustrates β-galactosidase architecture; it does not establish the source or suitability of a commercial food-grade lactase.
Confirm source, grade, activity method, formulation, storage and compatibility. Use stability data for the selected preparation; an optimum measured for one protein does not define every product’s operating window.
From screening to production
Plan a useful lactase trial
Set a matched control
Use your actual material. Keep pH, temperature, residence time and mixing identical in the untreated control, so physical processing effects are separated from enzyme action.
Screen dose and time
Compare a dose ladder and take a time course. State activity units and their assay definition, and express dose against a clear feedstock or process basis.
Validate the endpoint
Measure residual lactose, sweetness and storage outcome. Assess retained activity, downstream quality and cost per useful outcome before increasing scale.
04 / Go deeper
Lactase guides and scientific resources
ExPASy ENZYME ↗
Accepted reaction and EC nomenclature. Reaction summaries adapted; CC BY 4.0.
BRENDA ↗
Organism-specific functional data and original literature references.
RCSB PDB ↗
Experimental structural record used in the molecular view.
UniProt ↗
Individual protein sequences and functional evidence.
Lactase: common selection questions
What does lactase produce?
β-Galactosidase hydrolyses lactose to glucose and galactose. Selected enzymes can also catalyse transgalactosylation under suitable conditions. Acid-active and neutral lactase grades can have different process uses.
How do I test lactase for my process?
ONPG is a convenient model substrate for β-galactosidase. Confirm dairy performance using lactose and a validated lactose method or chromatography.
What should I check before buying lactase?
The E. coli structural example illustrates β-galactosidase architecture; it does not establish the source or suitability of a commercial food-grade lactase. Share your feedstock, operating conditions, target outcome and required documentation when requesting a grade recommendation.
Discuss your lactase application
Tell us your substrate, process conditions and target outcome.