Enzymatic Bioconversion of Hop Isoalpha Acids for Light Stability
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Solution Overview
Problem
Traditional methods for producing beer bittering agents using hop-derived isoalpha acids are inefficient, leading to light instability and the formation of skunky flavors and aromas, and rely on hazardous chemicals like sodium borohydride, which are not environmentally friendly or consumer-preferred.
Innovation Solution
A process using ketoreductase enzymes to bioconvert isoalpha acids into light-stable dihydro-(rho)-isoalpha acids, eliminating the need for sodium borohydride and leveraging natural enzymes for a more sustainable and consumer-friendly production method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional chemical reduction using sodium borohydride is used to produce dihydro-(rho)-isoalpha acids, then light stability is achieved, but safety and environmental friendliness deteriorate due to hazardous chemical reagents
Solution Approach 1:
The patent introduces ketoreductase enzymes as intermediary biocatalysts to replace the direct chemical reduction process using sodium borohydride. The enzyme acts as a mediator that facilitates the reduction of isoalpha acids to dihydro-(rho)-isoalpha acids through a biological pathway, eliminating the need for hazardous chemical reagents while maintaining product light stability
Solution Approach 2:
The patent substitutes the chemical reduction mechanism (using sodium borohydride) with a biological enzymatic reduction mechanism (using ketoreductase). This replacement transitions from a chemical-based process to a biology-based process, achieving the same chemical transformation without the harmful effects of chemical reagents
2Ease of operation
If isoalpha acids are used as bittering agents, then natural occurrence is maintained, but light stability deteriorates leading to skunky flavor formation
Solution Approach 1:
The patent applies preliminary enzymatic reduction to isoalpha acids before they are used as bittering agents. By pre-converting isoalpha acids to dihydro-(rho)-isoalpha acids using ketoreductase, the product is prepared in advance with enhanced light stability properties, preventing the formation of skunky flavors during storage and distribution
3Ease of manufacture
If conventional bittering methods are used, then traditional brewing processes are maintained, but utilization efficiency of bittering compounds deteriorates
Solution Approach 1:
The patent changes the chemical structure parameter of the bittering compounds by reducing isoalpha acids to dihydro-(rho)-isoalpha acids. This structural modification increases the utilization efficiency of bittering compounds, allowing brewers to achieve the desired bitterness with less material while maintaining compatibility with traditional brewing processes
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 process achieves high-yield conversion of isoalpha acids to dihydro-(rho)-isoalpha acids under mild conditions, providing a stable and natural bittering agent that can be used in beverages without the risks associated with chemical reagents, enhancing product stability and consumer acceptance.
Implementation Method 1
A process using ketoreductase enzymes to bioconvert isoalpha acids into light-stable dihydro-(rho)-isoalpha acids
Implementation Method 2
the portion of the isoalpha acids which is responsible for the photochemistry has been altered by reduction of a carbonyl group
Data Source
AI summary
The present invention relates to a process for producing a beer tittering agent via enzyme catalyzed bioconversion of hop-derived isoalpha acids to dihydro-(rho)-isoalpha acids and to the novel enzyme catalysts which may be employed in such a process.