Colour Fade From Detergent Enzymes: Cellulase Dosing and Alkalinity Limits in a Multi-Enzyme Blend

A customer wore and washed a black garment, it faded, and the item came back as a quality return; the detergent was described as a heavy-cellulase, stacked multi-enzyme formula with strong alkali and AES and MES oil dissolvers. The mechanism is the same one that makes cellulase useful: it cuts surface cellulose, and on dark dyed cotton the removed surface carries dye with it, so dose, alkalinity and mechanical action stack together. Protease in the same bottle wants a mildly alkaline base, pH 10 or below for a liquid and pH 11 or below for a powder; stronger alkali or acid holds the enzyme back.

Cold-water formulas are built around 20-30 C water and keep alkalinity and oxidisers down so the enzymes stay alive. So a formula that stacks heavy cellulase on strong alkali is fighting its own protease and overdosing the one enzyme that touches the fibre.

Single cellulase concentrate. What you get: Cellulase alone, packed for detergent makers and industrial laundries in 25 kg or 1000 L. Where it fits: You already run protease, amylase and lipase and want to set the fabric-care dose on its own. Watch-out: The easiest grade to overdose on dark cotton.

3-in-1 blend (protease, amylase, lipase). What you get: Stain removal only: protein, starch and fat, no fibre action. Where it fits: Boosters and liquids where fabric care is not a claim; a private-label booster spec lists exactly these three with cellulase only as an option. Watch-out: No pilling or colour-brightness claim possible.

4-in-1 blend (adds cellulase). What you get: Stain removal plus fabric life and colour retention in one granule. Where it fits: Powder detergents. Watch-out: The cellulase share is fixed by the blender, so you cannot turn it down for a colour-care variant.

5-in-1 blend (adds mannanase). What you get: Covers thickener and gum stains as well. Where it fits: Premium liquids; verify activity and quality control before trusting the enzyme count. Watch-out: More enzymes means more stability work in a liquid.

Powder detergent enzymes are coated granules: the enzyme is built onto a starch carrier and coated so the strong alkali in a powder cannot kill it in storage, while liquid detergent takes the liquid enzyme. German-market formulators rank a granule on three things beyond its cost: low dust, because granulation is the worker-protection and allergy control, storage stability, and activity density quoted per gram of granule. They are also told to check particle size distribution and residual dust on every granulated lot.

Industrial laundry buyers are pointed at granulated cellulase made specifically for powder detergent, and at suppliers who can show scale and delivery, not only a datasheet. Across the cellulase orders we have shipped, buyers commonly add neutral protease, lipase and alpha-amylase, and laundry detergent is rarely named as the application: most blend buyers build the system themselves and do not say so. Most of those buyers are in the US, with Germany, Canada and France next.

Bulk enzyme pricing is not on a spot list; it moves with activity units, form (liquid versus microgranulate or powder) and minimum order quantity, so a quote request without those three is a quote you cannot compare. Ask every supplier to quote against one specification: declared activity in U/g with the assay method, a batch-to-batch tolerance such as ±10 %, minimum guaranteed activity rather than nominal, particle size, dusting, bulk density, moisture, storage stability, and compatibility with your bleach, builders, surfactants and optical brighteners. Ask for the recommended dose in grams of enzyme per ton of finished detergent, the MOQ and annual capacity, and whether it ships in drums or supersacks; one distributor lists 88-lb drums and 2,205-lb supersacks for granular laundry enzymes.

Minimum orders for 4-in-1 granules are quoted at 500 kg and 1,000 kg, which is why a private-label start-up planning a 500, 2,000 or 10,000 unit first run usually starts with a blend rather than four separate enzymes. That start-up spec reads: protease, amylase and lipase, cellulase or mannanase as an option, fragrance-free, cold-water performance, no chlorine bleach, and the actual enzyme activity declared rather than a line saying it contains enzymes. Cellulase concentrates for detergent makers and industrial laundries come in 25 kg and 1000 L packs; for a trial, ask for the smallest pack the supplier will split.

Enzymes are proteins, not chemical additives, and the quality of the enzyme preparation decides the cleaning power you can claim, so a cheaper granule with a lower declared activity is not a saving.