Enzyme Granule Core and Salt Coating for Storage Stability
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Solution Overview
Problem
Enzymes in powder detergents face instability due to environmental aggressors, leading to reduced storage stability and performance.
Innovation Solution
Combining a reducing agent, peroxide decomposing catalyst, multivalent cation, acidic buffer, and a salt coating in the core or coating of enzyme granules to enhance stability, with the salt coating comprising at least 60% by weight of a salt with high humidity, encapsulating the core to form a continuous layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzymes are added to powder detergents to improve detergency, then cleaning performance is improved, but storage stability deteriorates due to environmental aggressors
Solution Approach 1:
The granule is divided into a core component (containing enzyme and stabilizers) and a coating component (protective layer). This segmentation allows the enzyme to be protected within the core while the coating provides external defense against environmental aggressors, resolving the contradiction between maintaining enzyme activity and protecting against harmful factors.
Solution Approach 2:
Stabilizers including reducing agents, peroxide decomposing catalysts, multivalent cations, and acidic buffers are incorporated into the core before exposure to environmental aggressors. This prior cushioning creates a protective chemical environment that prevents enzyme inactivation before harmful effects can occur, thereby improving storage stability while countacting environmental aggressors.
2Reliability
If a protective coating is applied to enzyme granules, then storage stability is improved, but device complexity increases
Solution Approach 1:
The protective function is extracted from the core enzyme granule and implemented as a separate coating layer. This allows the core to remain relatively simple while the coating provides the necessary protection, resolving the contradiction by separating the protective function from the enzyme-containing core.
Solution Approach 2:
The granule uses a composite structure with a core containing enzyme and stabilizers, and a coating providing protective functions. This composite approach allows each component to be optimized independently - the core for enzyme stability and the coating for protection - thereby improving storage stability without excessively complicating the overall structure.
3Reliability
If multiple stabilizers are incorporated into the core, then enzyme stability is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple stabilizers (reducing agents, peroxide decomposing catalysts, multivalent cations, and acidic buffers) are merged into a single core formulation. This consolidation allows all stabilizing functions to be incorporated in one manufacturing step rather than requiring separate addition steps for each stabilizer, thereby improving enzyme stability without proportionally increasing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly improves the storage stability of enzymes in granular detergents, maintaining enzyme activity over time even in the presence of aggressive components.
Implementation Method 1
the core or the coating comprises a peroxide decomposing catalyst selected from the group consisting of a catalase and a salt of V, Co, Mn, or Fe
Implementation Method 2
a peroxide decomposing catalyst selected from the group consisting of a catalase and a salt of V, Co, Mn, or Fe
Implementation Method 3
the coating comprises a salt wherein the coating makes up 5-70% by weight relative to the core and comprises at least 60% by weight w/w of a salt having a constant humidity at 20°C of at least 60%
Implementation Method 4
the core or the coating comprises an acidic buffer in an amount of 0.1-10% by weight relative to the core
Implementation Method 5
the core comprises a salt of a divalent or trivalent cation in an amount of 0.1-15% as anhydrous salt by weight of the core
Data Source
AI summary
The stability of enzymes in a powder detergent can be very significantly improved by the combination of four measures: • Addition of reducing agent/peroxide decomposing catalyst/antioxidant to the core or the coating • Addition of a multivalent cation to the core • Addition of an acidic buffer to the core or to the coating • Applying a salt coating onto the core.