An Enzyme Often Used in Laundry — Mannanase

Mannanase (β-mannanase)

1) What this enzyme “specialises in” in the laundry

What laundry formulas callmannanasehas its core value in dealing with a very typical, but often underestimated, class of “sticky-gum stains”:

• residues that come fromguar gumand **carob gum / locust bean gumand othermannan / galactomannan / glucomannan** thickeners

• This kind of polysaccharide residue sticks to the fibres like a glue, and “sticks back” other particles of dust and grease, causing a feel and an appearance of being hard to wash, and even of greying after the wash (re-deposition / fabric greying) Cortec Corporation+3Frontiers+3Univar Solutions+3

2) The correct definition of the enzyme: which bond does it cut?

The mannanase commonly used in industry / detergents mostly refers to endo‑β‑mannanase(an endo-type β-mannanase), and its international enzyme classification is:

• EC 3.2.1.78: mannan endo‑1,4‑β‑mannosidase

• The reaction:random hydrolysis of thebonds in mannan-type 1,4‑β‑D‑mannosidic polysaccharides

• The substrates include:mannans, galactomannans, glucomannans IUBMB+1

In plain language: it is not there to “dissolve oil” or “break down protein,” but to cut the backbone of certain thickening polysaccharides into smaller fragments, so they are more easily dispersed / dissolved in the wash and carried away.

3) Why are “mannan stains” especially hard to wash? The key is mannan glue effect

Many processed foods and personal-care products use guar gum / carob gum to form thickness and a gel feel. The literature and product technical data often use “glue” to describe how this kind of polysaccharide behaves on the fibres:

• It sticks to the fibres, making it easier for grit / dust / other soils to attach

• Leading to the problems of being “hard to wash off” and of “greying / redeposition after the wash” Frontiers+2Univar Solutions+2

So the positioning of mannanase is usually:First take the “glue” apart → release the other soils that were stuck → reduce redeposition (anti-redeposition) and greying of the cloth surface。Univar Solutions+1

4) Typical sources and matching stains (the situations most often met on the laundry floor)

Examples in the literature of “guar gum” in consumer products include:BBQ sauce, ice cream, salad dressing, and somecolour cosmetics and styling hair productsand so on Frontiers+1
Suppliers’ technical data also often list “chocolate ice cream / pudding, milkshakes, salad dressing” as examples of stubborn soils related to mannan gums.Aum Enzymes

When you write an educational website article, you can use “stain type” to teach consumers to judge whether they need a detergent that contains mannanase:

• Sticky sauces / dressings(barbecue sauce, thick tomato sauce, salad dressing and so on)

• Dairy / dessert thickeners(ice cream, milkshakes, chocolate desserts)

• Gummy residues from personal-care products(the thickening systems of some hair gels / styling products, and of make-up foundations) Frontiers+2Cortec Corporation+2

5) In a laundry formula, how is it usually described and used?

In the wording of publicly available industrial / trade materials, laundry mannanase is often positioned as:

1. Removing gum-based stains (thickener-gum stains)

2. Cutting mannan → forming smaller sugar segments → dissolving in the wash liquor and being rinsed away Univar Solutions+1

3. Reducing redeposition of dirt and lowering greying of the cloth surface(because once the “glue” is taken apart, other soils are less likely to stick back to the fibres)Univar Solutions+1

6) How it is paired with other laundry enzymes

Laundry enzymes are not a single-point solution; they “divide the work.” Review literature mentions that the main enzymes most commonly found in detergents are:protease, lipase, amylase, cellulase; and it points out thatalkaline β-mannanasehas in recent years served as a stain-removal enzyme that strengthens certain laundry stages Frontiers+1

In practical writing, it is suggested that you use “the composition of the stain” to explain the pairing:

• Mannanase: deals with thickening-gum types (guar / locust bean gum and the like)

• Amylase: starch-type stains

• Protease: protein-type stains

• Lipase: grease-type stains

• Cellulase: a care-oriented use related to the microfibrils on the cotton-fibre surface / a grey, hazy appearance (depending on the product’s positioning)

Publicly available materials also mention directly that β-mannanase can be used together with other enzymes (such as cellulase, lipase and amylase) to widen the stain-removal coverage.Cortec Corporation+1

7) The performance window a “detergent-grade” mannanase needs to have

(A) pH / temperature: most are designed towards being “alkali-tolerant and temperature-tolerant”

The laundry environment is usually on the alkaline side. In research-type materials one can see some detergent-candidate β-mannanases with an alkaline optimum activity and a wide pH stability, for example:

• A study reports a β-mannanase with maximum activity at pH 9.0, 70°C, which still retains a relatively high proportion of activity at pH 7.0–10.6 , and takes the laundry removal of mannan-containing food stains as its application setting.ScienceDirect

• Structural / mechanistic research also mentions that theoptimum pH of some alkaline β-mannanases can reach the 9.5level, and discusses the features of their adaptation to alkali.PLOS

(B) A cold wash: commercial products often treat this as one of their selling points

The publicly available materials of some commercial mannanases (commonly in liquid / unit-dose form) state directly: on stains containing locust bean gum / guar gum,a cold wash can also be effective, and they are designed for “demanding formula conditions” such as high pH, a high water-phase ratio (water-rich), the presence of strong chelators, and unit dose .Novonesis+2Univar Solutions+2

8) Formula compatibility, and “why mannanase is put into premium liquid detergents / capsules”

From publicly available trade materials one can summarise several common formula claims for laundry mannanase:

• Still stable in the presence of a strong chelator(for example, chelators added for hard-water / metal-ion management)Univar Solutions+2Univar Solutions+2

• Still stable at a high water-phase ratio (water-rich)(a common challenge for liquid detergents)Univar Solutions+1

• Still usable in a high-pH formula Univar Solutions+1

• Some products also label a built-in boron-free stabilizer, a stability design for multi-enzyme detergents, and so on Novonesis

An enzyme is not “just add it and that’s enough”; it has to pass through the formula environment, the storage period and the wash conditions, and still have effective activity at the end.

9) How should the dosage be written so that it is professional?

The more rigorous approachis not to give a single fixed percentage, but to divide it into two layers:

1. The principle: decide the amount to add according to the “target stain” and the “supplier’s activity units”; the concentration / activity of products from different suppliers may differ greatly, so the **TDS / COA (technical data / test report)** must be followed.

2. A public example that can be quoted: for example, one supplier (Aum Enzymes), in its mannanase product data, gives a “product addition ratio” as a general guide (note: this is aproductpercentage, not pure enzyme protein):

• Household detergent: 0.1–0.3%

• Liquid detergent: 0.2–0.4%

• Heavy duty detergent: 0.8–1.0%

• It also lists a higher-ratio range for dishwashing / industrial use Aum Enzymes

The same document also gives the operating window of its product (an example):pH 7–12, 30–70°C(the optimum range is 35–60°C, pH 8–11). You can write this as “a typical window for a detergent-grade mannanase of this class” and clearly mark the source.Aum Enzymes

10) Suggestions for use in the laundry

1. When is mannanase especially needed?
   When the stain has a “sticky, gummy feel,” commonly from residues of sauces / desserts / thickened personal-care products, and is accompanied by secondary attachment and greying after the wash, give priority to a formula that contains mannanase.Frontiers+2Univar Solutions+2

2. The logic of a pre-treatment / soak
   If the stain is very thick (for example a clump of thick sauce), first dissolve the surface layer with water / detergent, then go into the main wash and let the enzyme work in the bath. This usually lets the enzyme reach the mannan substrate more readily than “scraping it dry and putting it straight in the wash” (this is a necessary condition of enzyme action: contact with the substrate).

3. The logic of a multi-enzyme pairing
   This kind of stain is often a compound of “thickening gum + grease + protein / starch”; using mannanase first to take the “glue” apart, then dividing the work among lipase / protease / amylase, usually makes it easier to take the stain as a whole off the fibres.Cortec Corporation+1

11) Safety and occupational health

An enzyme is a protein material; in a workplace setting,inhalation of dust or aerosolsis one of the exposure routes that most need to be managed. Publicly available occupational-health materials point out:

• When handling an enzyme preparation, avoid inhaling aerosols and avoid contact with the skin / eyes; inhalation may trigger an immune response, and repeated exposure may lead to respiratory allergy.Enzyme Technical Association+1

• Some enzyme product data also classify a concentrated enzyme directly as a “sensitizer by inhalation,” and remind people that a liquid enzyme may form an inhalable aerosol when it is splashed or stirred vigorously.Aum Enzymes

• Industry guides also mention that, throughgranulation / changing the form of the product, engineering controls and safe operation, the problem of enzyme dust can be greatly reduced.Aise+1