Dual Desiccant Packaging for Freeze-Dried Bacteria
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Solution Overview
Problem
Freeze-dried lactic acid bacteria mixed with oral rehydration solution (ORS) powder face challenges in maintaining viability due to moisture sensitivity, leading to limited storage stability and unpredictable losses in activity, especially in ambient conditions, which is critical in developing countries where diarrhea treatment relies on these probiotics.
Innovation Solution
A packaging solution using two desiccants: one integrated into the aluminum foil and the other as anhydrous ORS powder, which functions as a desiccant to control moisture levels, ensuring the product's viability by removing moisture in two steps, thereby extending the shelf life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional aluminum foil packaging is used to protect freeze-dried lactic acid bacteria, then moisture barrier protection is provided, but moisture molecules can still penetrate through the foil and edges, compromising storage stability
Solution Approach 1:
The patent introduces desiccant material as an intermediary substance between the bacteria and the external environment. This desiccant acts as a mediator that actively absorbs moisture molecules that penetrate through the aluminum foil packaging, providing an additional protective layer that compensates for the foil's imperfect moisture barrier properties.
Solution Approach 2:
The packaging system combines multiple materials with complementary functions: aluminum foil provides the primary moisture barrier, while the desiccant material provides active moisture absorption. This composite approach creates a multi-layered protection system where each material addresses specific aspects of moisture control, significantly enhancing overall storage stability.
2Object-affected harmful factors
If desiccant sachets are incorporated into the package to remove moisture from headspace, then moisture control is improved, but desiccant material may leak and contaminate the product
Solution Approach 1:
The patent merges the desiccant material directly with the oral rehydration solution (ORS) powder, eliminating the need for separate sachets. This integration ensures that the desiccant and ORS are always in the correct proportions and prevents any possibility of desiccant leakage, as the desiccant is distributed uniformly within the ORS matrix.
Solution Approach 2:
The desiccant material serves dual functions: it acts as a moisture absorber to protect the bacteria during storage, and simultaneously serves as part of the oral rehydration solution that will be consumed by the patient. This multi-functionality eliminates the need for separate desiccant containment and ensures safe consumption.
3Object-affected harmful factors
If physical desiccant materials like molecular sieves are used, then water absorption occurs at all humidity levels, but absorption ceases when pore spaces are filled, making them ineffective at high humidity
Solution Approach 1:
The patent changes the fundamental parameter of the desiccant material from physical adsorption (molecular sieves with fixed pore capacities) to chemical hydration (hydrate-forming salts). This parameter change allows the desiccant to continuously absorb moisture through chemical reaction rather than physical saturation, maintaining effectiveness even at high humidity levels where physical desiccants would be saturated.
Solution Approach 2:
The desiccant utilizes phase transitions in the form of hydrate formation, where anhydrous salts transition to hydrated crystal structures by absorbing water molecules. This phase change mechanism provides continuous moisture absorption capacity that is not limited by fixed pore spaces, allowing the desiccant to function effectively across a wide range of humidity conditions.
4Object-affected harmful factors
If hydrate-forming salts are used as desiccants, then water is taken up until first hydrate forms, but no further water is taken up until second hydrate level is reached, causing breathing and deliquescence
Solution Approach 1:
The patent carefully selects and adjusts the parameters of the hydrate-forming salt system, including the specific salt type, crystal structure, and particle size distribution. These parameter changes are optimized to ensure that the salt forms hydrates progressively without sudden phase transitions, preventing breathing effects and deliquescence while maintaining stable humidity control throughout the package.
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 combination of desiccants in the packaging effectively maintains the viability of freeze-dried lactic acid bacteria, achieving at least 12 months of shelf life at 30°C, with potential for longer storage times at lower temperatures, significantly improving storage stability and maintaining bacterial activity.
Implementation Method 1
desiccant material contained in the sachets is typically in powder or granular form... that bind water molecules within the pore spaces of a material
Implementation Method 2
One solution to maintaining a particularly low or virtually nonexistent level of moisture within a package is to incorporate sachets of desiccant material into the internal space of the package to remove the moisture from the headspace of the package
Implementation Method 3
the second desiccant being anhydrous ORS... functions as a desiccant to control moisture levels, ensuring the product's viability by removing moisture in two steps
Data Source
AI summary
A method of packaging of products that are sensitive to moisture is provided, consequently prolonging the shelf-life of such a product, more specifically prolonging the shelf-life of freeze dried lactic acid bacteria mixed with oral rehydration solution (ORS) powder. The packaging includes two desiccants: one desiccant integrated in the foil material and the second desiccant being the anhydrous ORS.