Carbonated Beverage Microbial Stability via pH and CO2 Control
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Solution Overview
Problem
Existing methods for improving microbiological stability in still water-based beverages, such as Hot Filling and preservatives, are costly, time-consuming, and can lead to off-flavors or inefficiency against microbial spoilage, particularly yeast and mold growth.
Innovation Solution
A method involving carbonation of still water-based beverages with a low carbon dioxide concentration (approximately 500 mg/L to 1000 mg/L) combined with reduced preservative levels, using a dosing unit to transfer liquid carbon dioxide and filling into containers like PET bottles, which enhances shelf life without expensive equipment or high preservative concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Hot Filling or Cold Aseptic Filling technologies are used to improve microbiological stability, then microbial spoilage is prevented, but equipment cost and cleaning time increase significantly
Solution Approach 1:
The patent changes the physical-chemical parameters of the beverage by adjusting pH to acidic levels (below 4.6, preferably 2.0-4.0) and controlling water activity, creating an environment inhospitable to microbial growth. This parameter-based approach replaces complex thermal processing equipment with simple chemical composition control, reducing equipment costs and cleaning requirements while maintaining microbiological stability
Solution Approach 2:
The patent employs simple, inexpensive packaging materials and processing equipment that do not require expensive sterilization systems. By relying on the acidic environment and low water activity to prevent spoilage rather than expensive aseptic filling equipment, the system uses cost-effective, easily maintainable components
2Reliability
If preservatives are used at effective concentrations to prevent microbial spoilage, then yeast and mold growth is inhibited, but off-flavour is introduced to the beverage
Solution Approach 1:
The patent converts the naturally occurring acidity of fruit and vegetable juices from a potential spoilage risk into a protective mechanism. By adjusting and maintaining pH below 4.6 through natural acids present in the ingredients, the system creates a self-preserving environment that inhibits microbial growth without requiring additional chemical preservatives, thus avoiding off-flavours while maintaining reliability
3Object-generated harmful factors
If preservative concentration is reduced to avoid off-flavour, then natural flavor profile is maintained, but efficiency against microbial spoilage decreases
Solution Approach 1:
The patent simultaneously optimizes multiple parameters: pH (below 4.6, preferably 2.0-4.0), water activity (through sugar or salt addition), and redox potential. This multi-parameter approach creates a synergistic effect where the acidic environment and reduced water activity work together to prevent microbial growth, allowing minimal or no preservative usage while maintaining both natural flavor and spoilage prevention efficiency
Solution Approach 2:
The patent creates a composite preservation system combining natural acids from fruit/vegetable ingredients, added sugars or salts for water activity control, and optional minimal preservatives. This composite approach provides enhanced microbial protection compared to single-method preservation, maintaining natural flavor while improving reliability against spoilage
4Object-generated harmful factors
If still water-based beverages contain fruit and vegetable juices, then natural flavor is enhanced, but susceptibility to yeast and mold growth increases
Solution Approach 1:
The patent systematically adjusts key parameters of fruit and vegetable juice-containing beverages: lowering pH below 4.6 through natural acids, controlling water activity by adding sugars or salts, and managing moisture content. These parameter changes transform the naturally susceptible juice-based beverage into a microbiologically stable product while preserving the desirable natural flavors contributed by the fruit and vegetable ingredients
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
This approach effectively inhibits yeast and mold growth for at least 3 months, and up to 12 months in some cases, while maintaining a natural flavor profile and reducing preservative usage, thus providing a cost-effective and efficient alternative for microbiological stability.
Implementation Method 1
a method of improving microbiological stability in a still water-based beverage with respect to undesirable microbial growth, comprising at least one step of carbonating said beverage wherein the carbon dioxide concentration in the resulting beverage is from approximately 500 mg/L to 1000 mg/L
Data Source
AI summary
The present invention relates to a method of improving microbiological stability in a still water-based beverage with respect to undesirable growth of microbiological spoilage such as yeast and/or mould growth during their preparation and/or storage.