Fresh Cut Lemon Preservation via Chemical Covering Liquid and Vacuum Packaging
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Solution Overview
Problem
Current methods for preserving fresh cut lemons at room temperature fail to maintain their natural organoleptic properties for more than two months, with existing solutions like freezing or refrigeration limiting the preservation duration to a maximum of one month, and previous attempts at room temperature preservation only achieving 2 to 2.5 months.
Innovation Solution
A method involving the addition of a specific covering liquid comprising lemon juice, lime juice, ascorbic acid, citric acid, salt, and sodium metabisulphite, followed by deaeration and vacuum packaging with a nitrogen or water vapor atmosphere, optionally under high pressure, to maintain the freshness of fresh cut lemons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If freezing or refrigeration is used to preserve fresh cut lemon, then preservation duration is extended to one month, but the natural organoleptic properties are compromised and storage conditions require energy consumption
Solution Approach 1:
The invention changes the chemical parameters of the preservation system by introducing a specific covering liquid composition containing ascorbic acid, citric acid, salt, and sodium metabisulphite. This chemical parameter change enables preservation at room temperature (20°C) for 2-2.5 months, eliminating the need for refrigeration energy consumption while extending preservation duration beyond conventional room temperature methods
Solution Approach 2:
The invention applies vacuum packaging to create an inert atmosphere environment that removes oxygen and other gases from the packaging headspace. This inert environment prevents oxidative degradation and microbial growth, enabling extended preservation at room temperature without refrigeration energy input
2Use of energy by stationary object
If room temperature preservation in plastic and glass packaging is attempted, then energy consumption is reduced, but preservation duration is limited to 2 to 2.5 months
Solution Approach 1:
The invention modifies the chemical composition parameters by adding specific concentrations of ascorbic acid (0.1-1g/L), citric acid (0.1-1g/L), salt (0.1-1g/L), and sodium metabisulphite (0.1-1g/L) to the covering liquid. These parameter changes enhance the preservation efficacy, extending duration from 2-2.5 months to potentially longer periods while maintaining organoleptic properties at room temperature
Solution Approach 2:
The invention creates a composite preservation system combining multiple functional components: lemon juice (60-80% of covering liquid), lime juice (20-40% of covering liquid), and various additives (ascorbic acid, citric acid, salt, sodium metabisulphite). This composite formulation synergistically extends preservation duration while maintaining sensory qualities
3Ease of manufacture
If conventional preservation methods are used, then processing is simple, but the organoleptic properties deteriorate after two months maximum
Solution Approach 1:
The invention performs preliminary action by preparing the covering liquid with precise composition ratios and adding it to the lemon pieces before vacuum packaging. This preliminary preparation ensures that protective agents are already in place, extending organoleptic property duration from 2 months to potentially longer periods while maintaining simple processing
Solution Approach 2:
The invention applies vacuum packaging to create an inert atmosphere that prevents degradation reactions. This simple yet effective technique extends the duration of organoleptic properties from 2 months to potentially longer periods without complicating the manufacturing process
4Duration of action of stationary object
If vacuum packaging with covering liquid is applied, then preservation duration extends to 2-2.5 months at room temperature, but the process complexity increases
Solution Approach 1:
The invention merges multiple preservation functions into a single integrated system: the covering liquid provides chemical protection (antioxidants, antimicrobials), while vacuum packaging provides physical protection (oxygen removal). This combination achieves extended preservation duration without proportionally increasing process 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
This method effectively preserves fresh cut lemons at room temperature for a minimum of four months and up to two years when refrigerated, while maintaining their natural organoleptic properties.
Implementation Method 1
the addition of a covering liquid to the container housing the portions of cut lemon, said liquid combining lemon juice, lime juice, ascorbic acid, citric acid, salt and sodium metabisulphite
Implementation Method 2
vacuum packaging by the addition of an nitrogen or water vapor atmosphere
Implementation Method 3
vacuum packaging by the addition of an nitrogen or water vapor atmosphere
Implementation Method 4
after the deaeration and packaging, there may be an additional treatment step at high pressures of fresh cut lemon introduced in the covering liquid, of at least 300-600 MPa
Data Source
AI summary
The invention relates to a method for preserving fresh cut lemon, comprising at least the following steps: (a) the addition of a covering liquid to the container housing the portions of cut lemon, said liquid combining lemon juice, lime juice, ascorbic acid, citric acid, salt and sodium metabisulphite; (b) the deaeration of the covering liquid; and (c) vacuum packaging.