Bromelain Enzyme for Leather and Hide Processing
Soften hides and remove epidermis in tannery bating operations using bromelain as an effective alternative to pancreatic protease enzymes at pH 5.0–8.0.
Tannery wet processing involves a series of enzymatic and chemical operations to convert raw hides into leather suitable for tanning. Two operations are particularly suited to bromelain application: epidermis removal (dehairing and grain cleaning) and bating (removal of non-structural proteins from the corium). Traditionally, bating has used pancreatic enzyme preparations — primarily trypsin and chymotrypsin from porcine pancreas — to selectively hydrolyse non-fibrous proteins in the hide corium after liming. Pancreatic preparations have several practical limitations: they are by-products of the meatpacking industry with inherently variable supply and activity; they are active only in a narrow alkaline pH range; and they require careful control to avoid fibroin degradation. Bromelain (EC 3.4.22.32), a cysteine protease from pineapple stem, offers complementary or alternative bating action with different substrate specificity. Bromelain is active across a broader pH range (5.0–8.0) and hydrolyses non-structural proteins — elastin, non-fibrous collagen degradation products, and proteoglycans — in the hide corium. Its cysteine protease mechanism is distinct from the serine protease mechanism of trypsin, providing different selectivity that can be advantageous for specific leather types. In dehairing, bromelain has been evaluated as a component of enzyme-assisted dehairing systems that aim to reduce sodium sulfide use. At pH 7.5–8.5 and 30–35°C, bromelain weakens the hair follicle attachment by hydrolyzing proteins at the dermal papilla and inner root sheath, allowing hair removal with lower sulfide concentrations. In unhairing and soaking, bromelain at lower doses cleans the epidermis surface and removes keratinised debris from the grain surface, contributing to grain clarity in the final leather. For bating, bromelain at pH 6.0–8.0 and 35–42°C, dosed at 0.1–0.5% on pelt weight, selectively removes non-structural proteins without significantly degrading the fibrillar collagen that forms the leather structure. For leather goods where very soft handle is required — garment leather, glove leather, nappa leather — bromelain can be used at higher dosage and extended contact time to achieve intensive bating. Our bromelain is produced from Ananas comosus stem, standardised at 600–2,400 GDU/g, supplied with HALAL certification and ISO 9001 documentation for tannery procurement.
Enzyme-Assisted Dehairing — Reduced Sulfide
Bromelain at 0.05–0.2% on hide weight in the unhairing paddle (pH 8.0–9.5, 30–35°C, 2–4 hours) weakens the hair follicle attachment by hydrolysing proteins at the papilla, allowing hair loosening with 20–40% reduction in sodium sulfide dosage. Reduced sulfide improves effluent quality (lower sulfide BOD), reduces hydrogen sulfide generation, and improves grain quality by limiting sulfide-induced fibre swelling.
Bating — Cattle Hide for Upholstery Leather
Bromelain at 0.1–0.2% on pelt weight (pH 6.5–8.0, 37–40°C, 60–120 minutes) selectively removes elastin and non-fibrous proteins from the corium, improving temper, reducing stiffness, and enhancing tanning penetration in cattle hides for upholstery and automotive leather. The result is uniform, consistent bating across the pelt with reduced variability compared to pancreatic preparations.
Intensive Bating for Garment and Glove Leather
Garment and glove leathers require maximum softness through intensive protein removal. Bromelain at 0.3–0.5% on pelt weight at pH 6.0–7.5 and 38–42°C for 2–4 hours provides deep bating of non-structural proteins, producing a highly extensible, soft corium. The broad pH optimum of bromelain (5.0–8.0) allows more flexible pH adjustment during intensive bating without the narrow pH window of trypsin-based preparations.
Grain Surface Cleaning and Epidermis Removal
After liming, residual epidermis and keratinised surface layers can cause grain defects in finished leather. Bromelain at 0.02–0.1% on pelt weight in a short soak (pH 7.0–8.0, 30°C, 30–60 minutes) hydrolyses residual keratin and surface proteins, improving grain clarity and reducing the appearance of grain defects in the finished leather surface.
| Parameter | Value |
| Activity range | 600 – 2,400 GDU/g |
| Optimal pH | 5.0 – 8.0 |
| Optimal temperature | 30°C – 55°C |
| Form | Light yellow to tan powder |
| Shelf life | 24 months (sealed, cool, dry place) |
| Packaging | 25 kg drums / custom packaging |
Perguntas Frequentes
How does bromelain compare to pancreatic (trypsin) bating enzymes in leather?
Pancreatic trypsin is a serine protease optimally active at pH 7.5–9.0, derived from porcine pancreas with inherent supply variability. Bromelain is a cysteine protease from pineapple stem with a broader pH optimum (5.0–8.0), allowing more flexible pH management during bating. Their substrate specificities differ: trypsin cleaves at arginine and lysine residues; bromelain cleaves at a broader range of sites. In practice, bromelain can substitute or complement pancreatic preparations, and tanneries may use them in combination for tailored bating profiles.
What is the bating endpoint and how is it measured in leather processing?
Bating endpoint is assessed by the float test (pelt sinks slowly in water when correctly bated), pelt flexibility, vein pattern visibility on the flesh side, and grain surface appearance. For intensive bating (garment leather), extended float time and high flexibility are the targets. Underbated hides feel stiff and show poor temper; overbated hides may show grain looseness or collagen surface damage. Adjust bromelain dose and contact time based on these physical assessments across pelt trials.
Is bromelain Halal-suitable for tanneries supplying Muslim-majority markets?
Yes. Bromelain is derived from Ananas comosus (pineapple), a plant source, and is inherently Halal. Our bromelain is HALAL certified by an accredited certification body. For tanneries processing hides into leather for Muslim-majority markets (Middle East, Southeast Asia) where Halal leather processing is required, plant-derived bromelain is preferred over porcine pancreatic preparations which may carry Halal compliance issues in some markets.
What documentation is provided for tannery procurement?
We supply COA with protease activity (GDU/g and/or casein method U/g), TDS covering pH and temperature activity profiles relevant to bating and dehairing conditions, MSDS, ISO 9001 certificate, and HALAL certification. For tanneries requiring it, we can also provide heavy metal absence data, microbiological safety data, and country-of-origin documentation. Technical support for dosage trials is available through our enzyme applications team.
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