Catalase for Dairy Milk — Deperoxidation Before Culture Addition
Remove residual hydrogen peroxide from cold-pasteurized milk, cream, and whey before starter culture inoculation, protecting fermentation consistency in cheese, butter, and cultured dairy production.
In dairy-producing regions where refrigeration infrastructure is limited, or where regulations permit hydrogen peroxide as an antimicrobial treatment for raw milk, H2O2 is used to extend raw milk shelf life or reduce pathogen load — a process known as cold pasteurization or chemical pasteurization. The critical step that follows is complete H2O2 removal before adding rennet, starter cultures, or other downstream processing agents, because even trace peroxide residues inhibit lactic acid bacteria, slow acidification, and disrupt curd formation. Catalase enzyme for dairy milk deperoxidation is the standard industrial method for this step. Catalase (EC 1.11.1.6) decomposes hydrogen peroxide into water and oxygen without leaving any chemical residue in the milk. In food-grade dairy applications, the enzyme must be sourced from an organism acceptable for food-contact use — typically Aspergillus niger — and supplied with the appropriate food-grade certifications. At the operating conditions of cold milk processing — typically pH 6.5–7.0 and 10–40°C — catalase enzyme maintains sufficient activity to reduce H2O2 from typical treatment levels (up to 0.08% v/v per FAO/WHO CODEX guidelines) to undetectable or trace residuals within a practical contact time of 5–30 minutes. Dosage is typically 5–20 U per mL of milk, with the final dose calibrated to the initial H2O2 concentration and desired endpoint residual. For cheese production, residual H2O2 must be negligible before rennet addition; for cultured butter and fermented dairy, the same endpoint is required before starter culture inoculation. Technical buyers for dairy plants need food-grade documentation, stable supply, and consistent activity between lots to maintain process predictability across production campaigns.
Raw milk H2O2 treatment deperoxidation
When raw milk is treated with hydrogen peroxide at 300–800 ppm to extend shelf life in warm-climate collection chains, the H2O2 must be fully removed before further processing. Catalase enzyme at 10–20 U/mL milk, added at pH 6.5–7.0 and 15–37°C, decomposes residual peroxide to below 1 ppm within 10–30 minutes. This step is typically performed in holding tanks before pasteurization or culture addition, and the enzyme is inactivated by subsequent heat treatment.
Cheese milk deperoxidation before rennet and culture addition
In cheese production, residual H2O2 in milk inhibits both starter cultures and rennet activity, leading to poor acidification, weak curd, and yield loss. Catalase enzyme at 5–15 U/mL milk reduces H2O2 to undetectable levels within 15–25 minutes at 30–37°C and pH 6.5–7.0. The enzyme treatment is followed by normal cheese-making steps — culture inoculation, rennet addition, and curd cutting — without any chemical carryover from the deperoxidation step.
Cream and butter base deperoxidation
Cream that has been treated or stored in contact with H2O2-sanitized equipment can carry peroxide residues that oxidize milk fat and inhibit cultures in cultured butter, crème fraîche, and sour cream production. Catalase enzyme treatment at 10–20 U/mL cream at pH 6.5–7.0 and 15–25°C removes peroxide before culture addition, preventing rancidity development from lipid oxidation and ensuring consistent acidification of the fermented cream.
Whey and whey protein processing deperoxidation
In whey processing for protein concentrate or isolate production, H2O2 may be used as a sanitation agent for membranes and equipment. Residual peroxide in whey can oxidize cysteine and methionine residues in whey proteins, reducing nutritional quality and creating off-flavors. Catalase enzyme treatment of whey streams at 5–15 U/mL, pH 6.0–7.0, and 20–40°C removes oxidant before membrane filtration or spray drying, protecting protein quality in the final product.
| Parameter | Value |
| Activity range | 50,000 – 200,000 U/g |
| Optimal pH | 6.0 – 8.0 |
| Optimal temperature | 20°C – 50°C |
| Form | Dark brown powder or liquid |
| Shelf life | 12 months (sealed, cool, dry place) |
| Packaging | 25 kg drums / 25 kg jerricans |
Frequently Asked Questions
Is catalase enzyme approved for dairy milk processing?
Catalase enzyme from Aspergillus niger and Micrococcus lysodeikticus has a long history of use in dairy milk deperoxidation and is recognized under relevant food enzyme regulations in major markets. For specific regulatory status — including use in cheese milk in the EU, US, and export markets — buyers should verify with their food safety authority using the enzyme's COA and technical file. We supply food-grade catalase with ISO 9001, HALAL, KOSHER, and Food Grade documentation to support compliance review. Confirm applicability in your jurisdiction before use.
How much catalase enzyme is needed to deperoxidize milk?
Typical dosage for dairy milk deperoxidation is 5–20 U of catalase activity per mL of milk, depending on the initial H2O2 concentration and required contact time. At H2O2 levels up to 300 ppm (0.03%), a dose of 5–10 U/mL at pH 6.5–7.0 and 30–37°C usually achieves full decomposition within 15–25 minutes. Higher initial H2O2 from cold-pasteurization protocols (up to 800 ppm) requires proportionally higher enzyme dose or longer contact time. Plant trials with peroxide test strips or enzymatic H2O2 assay should confirm the endpoint.
Does catalase enzyme affect milk taste, aroma, or composition?
No. Catalase enzyme decomposes H2O2 into water and oxygen, leaving no additional chemical in the milk. The enzyme itself is a protein that is denatured and inactivated by subsequent pasteurization heat treatment, so no active enzyme remains in the finished product. Correctly dosed catalase treatment does not alter milk fat, protein, or lactose composition, and does not introduce off-flavors. Overdosing can cause excessive oxygen release (foaming), which is managed by appropriate dosing and mixing.
Can catalase enzyme be used in organic or clean-label dairy production?
Catalase enzyme is derived from microbial fermentation and is a single-function processing aid — it acts on H2O2 and is inactivated by heat, leaving no active residue. Whether it qualifies for organic or clean-label certification depends on the specific certifying body, regional organic standards, and whether H2O2 itself is permitted as a dairy treatment in the relevant organic protocol. Buyers should verify enzyme acceptability under their certification standard. We can provide documentation supporting the enzyme's microbial source, processing aid status, and the absence of GMO materials where applicable.
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