Solid Laccase Granule Buffering for Alkaline Storage Stability
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Solution Overview
Problem
Laccase enzymes in solid formulations experience rapid activity loss during storage due to pH decrease in their micro-environment, despite initial production in an alkaline environment.
Innovation Solution
Incorporating a high amount of alkaline buffer into the laccase granules to maintain an alkaline pH, with a reserve alkalinity of at least 0.3 g NaOH per 100 g granules, ensuring a pH range of 8 to 11 in a 1% w/w aqueous solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laccase is formulated in solid granules without sufficient alkaline buffer, then the granule structure is simpler and manufacturing is easier, but the laccase activity decreases rapidly during storage due to pH decrease
Solution Approach 1:
The patent changes the chemical parameter of the granule composition by incorporating an alkaline buffer system (such as carbonates, bicarbonates, phosphates, or borates) in specific amounts (0.1-10% w/w of granule weight). This parameter change maintains the pH in the range of 7-11 during storage, preventing the pH decrease that would otherwise cause rapid laccase activity loss. The buffer capacity is specifically controlled to ensure adequate alkaline reserve without excessive complexity.
2Reliability
If a high amount of alkaline buffer is added to maintain pH, then laccase activity is stabilized during storage, but the granule composition becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The patent optimizes the buffer concentration parameter to a specific range (0.1-10% w/w of granule weight) that provides sufficient pH stabilization while avoiding excessive complexity in manufacturing. This parameter optimization ensures that the buffer is present in enough quantity to maintain laccase activity (pH 7-11) but not so much as to create handling or processing difficulties.
Solution Approach 2:
The alkaline buffer acts as an intermediary substance between the laccase enzyme and the external environment. It mediates the pH conditions by absorbing excess protons or releasing hydroxide ions as needed, thereby creating a stable microenvironment for the laccase without requiring direct intervention in the granule structure or manufacturing process. Common buffers like carbonates, bicarbonates, phosphates, or borates serve this intermediary function effectively.
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
The laccase activity is significantly stabilized during storage, with residual activity maintained at or above 100% after one week at elevated temperatures.
Implementation Method 1
Incorporating a high amount of alkaline buffer into the laccase granules to maintain an alkaline pH
Implementation Method 2
Laccases are redox enzymes, acting by oxidizing substrates using molecular oxygen
Data Source
AI summary
The invention provides an enzyme granule comprising a mixture of a laccase and a buffer in an amount capable of maintaining an alkaline pH.