Foaming Freeze-Dried Coffee via Gas-Containing Additives
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Solution Overview
Problem
Existing instant coffee compositions, particularly freeze-dried ones, lack the foaming capability when reconstituted with hot water due to insufficient surface-active species at the internal pore surfaces, resulting in a poorer foam performance compared to spray-dried coffee powders, and methods to achieve foaming in freeze-dried coffee often alter its appearance and bulk density, making it unsuitable for consumer standards.
Innovation Solution
A foaming instant coffee composition with a bulk density of 0.16 to 0.45 g/cm3 is created by incorporating a foamable component with closed pores or clathrates containing gas into a freeze-dried or agglomerated coffee matrix, using a process that involves mixing the foamable component with an aqueous coffee extract, freezing, and then freeze-drying or agglomerating to maintain the desired bulk density and visual characteristics while enhancing foaming capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas injection and spray-drying are used to create foaming coffee composition, then foaming capability is improved, but the method cannot be applied to freeze-dried coffee and alters appearance and bulk density
Solution Approach 1:
The invention utilizes freeze-dried coffee particles with inherent porous structure created during the freeze-drying process. These pores are formed when ice crystals sublimate, leaving void spaces that can trap gas. The porous structure is maintained throughout subsequent processing, allowing the particles to foam when reconstituted with hot water without requiring gas injection or spray-drying.
Solution Approach 2:
The invention changes the physical parameters of the coffee processing by using freeze-drying instead of spray-drying, and by controlling the freezing and drying conditions to create optimal pore structure. By adjusting freezing temperature, drying rate, and particle size, the invention achieves foaming capability in freeze-dried coffee while maintaining appearance and bulk density within consumer-acceptable ranges.
2Reliability
If spray-drying is used to retain gas bubbles in coffee composition, then foaming is achieved, but the elevated temperatures degrade flavor and appearance
Solution Approach 1:
The invention exploits the phase transition of water from liquid to solid (freezing) and then from solid to gas (sublimation) during freeze-drying. This phase transition process creates a porous structure that traps gas bubbles without requiring high-temperature spray-drying. The low-temperature freeze-drying process preserves flavor and appearance while achieving foaming capability through the porous matrix formed during sublimation.
3Reliability
If bulk density is reduced to enhance foaming, then foam volume increases, but the coffee composition becomes unsuitable for consumer standards
Solution Approach 1:
The invention creates local porosity within individual coffee particles rather than reducing the bulk density of the entire coffee composition. The freeze-drying process creates pores within each particle, and gas bubbles are trapped within these particle-level pores. This localized foam generation mechanism allows the coffee to produce significant foam volume while maintaining the bulk density of the overall composition within consumer-acceptable ranges (typically 0.15-0.25 g/cm³).
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 resulting coffee composition retains the visual and taste characteristics of standard freeze-dried coffee while achieving a significant foaming effect, with enhanced foam volume and stability upon reconstitution, meeting consumer expectations for strength and appearance.
Implementation Method 1
said particles comprising a continuous phase comprising an instant coffee matrix and a non continuous phase comprising particles of a foamable component containing a gas
Implementation Method 2
particles of a foamable component containing a gas
Implementation Method 3
freezing, and then freeze-drying or agglomerating
Implementation Method 4
freeze-drying
Implementation Method 5
agglomerated granular instant coffee composition
Data Source
AI summary
The present invention provides a foaming instant coffee composition comprising particles having a bulk density of from 0.16 to 0.45 g/cm3, said particles comprising a continuous phase comprising an instant coffee matrix and a non-continuous phase comprising particles of a foamable component containing a gas.