Enzyme Liquid

Ingredients

Raw Material	% w/w (as received)	Function	Notes
Deionised water	47.55	Solvent	To 100%; quality critical
SLES 70%	14.00	Primary surfactant	9.8% active
AOS 38%	8.00	Co-surfactant	Enzyme-compatible; non-sulfate
CAPB 30%	5.00	Co-surfactant	Viscosity; mildness
Fatty alcohol ethoxylate AE-7	3.00	Nonionic surfactant	Grease cutting
Sodium citrate	4.00	Builder	Moderate chelation; enzyme-friendly
Propylene glycol (MPG)	8.00	Primary enzyme stabilizer	High loading for stability
Borax (sodium tetraborate decahydrate)	2.50	Protease inhibitor	Active-site blocking
CaCl₂·2H₂O	0.15	Calcium supplement	Structural Ca²⁺ for enzymes
Sodium chloride (NaCl)	1.50	Thickener
CMC (medium viscosity)	1.00	Thickener / anti-redeposition
Liquid protease (≥150 KNU/g)	1.50	Enzyme	Maximum loading
Liquid α-amylase (≥80 KNU/g)	1.00	Enzyme	Maximum loading
Liquid lipase (≥100 KLU/g)	0.60	Enzyme	Grease stains
Liquid mannanase (≥500 MANU/g)	0.30	Enzyme	Gum-based food soils
Liquid pectate lyase (≥500 PELU/g)	0.15	Enzyme	Fruit/vegetable stains
Optical brightener (CBS-X, 20% slurry)	0.30	Brightening
Fragrance	0.35	Aesthetic	Enzyme-compatible grade
Colourant	0.01	Aesthetic
Preservative (MIT/BIT blend)	0.14	Preservation
Citric acid (50% solution)	q.s.	pH adjustment	Target pH 7.5–7.8
Total	100.00

Addition Order & Process

Addition Order & Process (Enzyme Stabilization Protocol): 1. Charge 65% of deionised water. Heat to 30 °C; agitate at 250 rpm. 2. Add SLES 70%. Mix 10 minutes. 3. Add AOS 38% and CAPB 30%. Mix 15 minutes. 4. Add AE-7. Mix 10 minutes. 5. Add sodium citrate (dissolved). Mix 5 minutes. 6. Add propylene glycol. Mix 5 minutes. 7. Add borax. Mix 15 minutes until fully dissolved. The borate/MPG complex begins forming. 8. Add CaCl₂·2H₂O. Mix 10 minutes. Calcium ions complex with the borate/MPG network. 9. Add CMC (predispersed). Mix 15 minutes. 10. Add sodium chloride. Mix 15 minutes. Check viscosity (target: 800–1,500 cP). 11. Cool to 25 °C. Verify temperature does not exceed 25 °C before enzyme addition. 12. Add protease. Mix at 200 rpm for 5 minutes. This 5-minute holding period is critical: it allows the reversible borate-protease active-site complex to form before other enzymes are introduced. 13. Add α-amylase. Mix 5 minutes. 14. Add lipase. Mix 5 minutes. 15. Add mannanase and pectate lyase. Mix 5 minutes each. 16. Add remaining additives (brightener, fragrance, colourant, preservative). Mix 5 minutes each. 17. Adjust pH to 7.6 ± 0.2 with citric acid. Enzyme stability is maximized between pH 7.5–8.0; deviations >0.3 pH units reduce shelf life significantly. 18. Deaerate under vacuum for 15 minutes. Addition Order & Process: 1. Charge 60% of deionised water. Heat to 35 °C; agitate at 300 rpm. 2. Add SLES 70%. Mix 10 minutes. 3. Add AOS 38%, APG 50%, and CAPB 30%. Mix 15 minutes. 4. Add AE-9. Mix 10 minutes. 5. Add sodium citrate (dissolved) and GLDA. Mix 10 minutes. 6. Add propylene glycol, borax, and CaCl₂·2H₂O. Mix 10 minutes. 7. Add CMC (predispersed). Mix 15 minutes. 8. Add sodium chloride. Mix 15 minutes. Check viscosity (target: 1,000–2,000 cP). 9. Cool to 25 °C. Add protease; mix 5 minutes, then α-amylase; mix 5 minutes. 10. Add optical brightener slurry and colourant. Mix 5 minutes each. 11. Add esterquat fabric softener (pre-warmed to 35 °C). Mix 15 minutes at 200 rpm. Avoid high shear — esterquat emulsion breaking reduces deposition efficiency. 12. Add pearlescent agent dispersion. Mix 10 minutes at 150 rpm. 13. Add liquid fragrance. Mix 5 minutes. 14. Add perfume microcapsules with gentle folding action (150 rpm, 15 minutes). Do not homogenize. 15. Add preservative. Mix 5 minutes. 16. Adjust pH to 7.8 ± 0.3 with citric acid. 17. Deaerate under vacuum for 15 minutes.

Expected Parameters

Expected Parameters: pH 7.6 ± 0.2; viscosity 800–1,500 cP; active matter 18.0–22.0% w/w; enzyme activity retention ≥85% after 12 weeks at 37 °C (accelerated); ≥90% after 12 weeks at 30 °C. Shelf life: 24 months at 5–35 °C. Dosage: 45–60 g per wash. Expected Parameters: pH 7.8 ± 0.3; viscosity 1,000–2,000 cP; active matter 20.0–25.0% w/w; total fragrance loading 2.05% (0.6% microencapsulated oil + 1.0% neat oil + 0.45% capsule wall material); perfume capsule integrity ≥85%; fabric softness rating ≥4.0/5.0 (panel test, n=20). Shelf life: 24 months at 5–35 °C.

Formulation Notes

Enzyme liquids prioritize maximum enzymatic stain removal performance with a stabilization system engineered for tropical distribution (up to 40 °C) and extended shelf life (24+ months). FC-6.5 incorporates the complete borate + propylene glycol + calcium stabilization protocol at optimized concentrations.

Formulation Card FC-6.5: Enzyme-Stabilized Liquid Laundry Detergent

The FC-6.5 formulation embodies the complete enzyme stabilization science reviewed in Chapter 4, Section 4.1.6. Borate anions reversibly bind the serine residue in the protease active site; propylene glycol at 8% stabilizes the borate-enzyme complex and maintains a structured solvent environment; calcium at 0.15% (0.06% Ca²⁺) compensates for chelation losses to the citrate builder.The five-enzyme system is the most comprehensive in this chapter, adding mannanase (guar gum, ice cream, chocolate stains) and pectate lyase (fruit, vegetable, berry stains) to the standard protease-amylase-lipase triad.Water content at 47.55% is kept below 50% to reduce hydrolytic degradation rates; water activity (a_w) should be verified at <0.85 for optimal enzyme shelf life.

The protocol in Table 6.2 generalizes beyond FC-6.5 to any enzyme-containing liquid detergent. The three-pillar stabilization system (borate inhibition + glycol solvent structuring + calcium supplementation) has been validated across pH 7.0–8.5 and water contents of 30–60%.The critical process control is the 5-minute protease-borate complexation holding period: adding all enzymes simultaneously or adding protease at >30 °C reduces shelf-life stability by 30–50%. Formulators should also note the anionic surfactant limit for lipase compatibility — above 15% active anionics, lipase interfacial activation is suppressed, reducing performance on grease and sebum stains.#### 6.2.5 Perfumed Luxury Liquid (FC-6.6)

The perfumed luxury tier prioritizes sensorial experience — fragrance intensity, fabric softness, and visual aesthetics — while maintaining cleaning performance equivalent to the premium standard tier. FC-6.6 incorporates a fabric conditioning agent, elevated fragrance loading with dual delivery systems (neat + microencapsulated), and a visually distinctive pearlescent or clear-gel appearance.

Formulation Card FC-6.6: Perfumed Luxury Liquid Laundry Detergent

The fragrance system in FC-6.6 at 2.05% total loading is approximately 4× the standard tier (0.4%) and 2× the premium tier (0.7% neat + 0.6% encapsulated). The dual delivery architecture provides both immediate impact (neat perfume in the bottle and during washing) and extended release (microcapsules depositing on fabric and rupturing under friction during wear).The esterquat fabric softener at 2% (1.8% active) provides cationic conditioning through electrostatic deposition on negatively charged cotton fibers (zeta potential −20 to −40 mV), with biodegradation superior to legacy DHTDMAC systems.The pearlescent agent at 0.5% creates visual differentiation through light-diffusing crystalline platelets of ethylene glycol distearate — a cosmetic industry technique adapted for laundry packaging impact.