Protease DH

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Cat No.

PDHG-001

Description

Protease DH is a high-performance specialized enzyme preparation for leather dehairing. It rapidly loosens hair follicles under mild reaction conditions, and enzymatic dehairing reduces environmental pollution compared with conventional chemical dehairing methods.

Applications

Leather dehairing
Animal hide processing

Appearance

Milky white to light yellow solid powder

Product Overview

This dehairing enzyme preparation is designed to rapidly loosen hair roots during hide processing. Dehairing performance increases with higher dosage, elevated temperature, and longer processing time, while excessive dosage or excessively high temperature may damage the grain surface.

Form

Solid powder

pH Stability

Effective pH range: 6.0-12.0

Specificity

Acts on hair-root and keratin-containing structures during animal-hide dehairing.

Optimum pH

6.0-8.0

Optimum temperature

30-40°C; effective temperature range: 20-60°C

Storage

Protect from light and keep at low temperature in a dry, well-ventilated environment during transport and storage. When stored in the original sealed packaging in a cool, dry environment, the shelf life is 12 months. Do not store above 40°C.

Warnings

Enzyme preparations are proteins. Inhalation of dust or suspended particles may cause allergic reactions in susceptible individuals. Prolonged contact with certain enzymes may irritate the skin, eyes, and mucous membranes. Splashing or vigorous agitation may create inhalable dust. Wear protective clothing, gloves, and eye or face protection.

Function

Promotes rapid loosening of hair roots and enzymatic dehairing of animal hides.

Substrates

Animal hides; keratin in the stratum corneum

Quality

Fineness (passing through 40-mesh standard sieve): ≥80%
Loss on drying: ≤8.0%
Lead (Pb): ≤5.0 mg/kg
Total arsenic (as As): ≤3.0 mg/kg
Total plate count: ≤50,000 CFU/g
Coliforms: ≤30 CFU/g
Escherichia coli: <10 CFU/g; ≤3.0 MPN/g
Salmonella (25 g): Not detectable

Protocol

Hide preparation: Thaw and wash frozen hides, then place them in a drum.
Water ratio: Hide:water = 1:1.
Enzyme dosage: Add the enzyme preparation at 0.5% of hide weight and mix thoroughly.
Process conditions: pH approximately 7.0; temperature 35°C.
Processing: Start the drum and inspect dehairing after approximately 4 hours; continue until dehairing is complete.
Scale-up check: Because leather type, source, and local operating conditions vary, conduct a small-scale test under identical production conditions before large-scale production.
Process caution: Avoid excessive dosage or process variations. For lower-quality leather, control the procedure and timing with particular accuracy.

Advantages

Rapid hair-follicle loosening under mild reaction conditions.
Conventional sodium sulfide dehairing acts on keratin disulfide bonds but generates large volumes of wastewater and can compromise leather quality.
Protease can efficiently cleave the disulfide bonds of keratin and gently promote dissociation of elastic tissue.
Compared with conventional chemical dehairing methods, enzymatic dehairing significantly reduces environmental pollution.

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Project Description:

For research and industrial use only. Not intended for personal medicinal use. Certain food-grade products are suitable for formulation development in food and related applications.

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