Probiotic Soft Gel Capsule Low-Temperature Encapsulation
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Solution Overview
Problem
Existing methods for producing soft gel capsules with probiotic bacteria face challenges in maintaining viability due to sensitivity to temperature, moisture, and mechanical stress, leading to significant loss of bacteria during production and storage.
Innovation Solution
The process involves using a low fill temperature and gelatin with a lower melting point, along with careful control of water activity during production and storage, to minimize bacterial loss and ensure the survival of probiotic bacteria. This includes mixing uncoated probiotic bacteria with oil at 5-15°C, encapsulating in gelatin with a melting point of 11-28°C, and drying to a water activity of ≤0.25 to maintain bacterial viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gelatin with higher melting point is used, then the soft gel capsule shell has sufficient structural strength, but the probiotic bacteria die during production due to high temperature
Solution Approach 1:
The patent changes the key parameter of gelatin melting point from conventional high melting point (above 30°C) to low melting point (11-28°C). This parameter change allows the production process to be conducted at lower temperatures (5-15°C fill temperature) that preserve probiotic bacteria viability while still forming an intact capsule shell structure.
Solution Approach 2:
The patent employs a gelatin shell with dynamic temperature-dependent properties: at low production temperatures (5-15°C) the gelatin remains soft and moldable, allowing bacteria survival; at higher storage temperatures the gelatin provides sufficient structural strength. This dynamic behavior resolves the contradiction between low-temperature processing and high-temperature structural integrity.
2Reliability
If water activity is reduced to improve bacterial survival, then probiotic bacteria remain viable longer, but the soft gel capsule becomes brittle and leaks
Solution Approach 1:
The patent optimizes the water activity parameter to a specific range (0.15-0.25) that simultaneously satisfies two opposing requirements: low enough to preserve probiotic bacteria viability during storage, but high enough to maintain gelatin shell flexibility and prevent brittleness. This precise parameter optimization resolves the contradiction between bacterial survival and capsule integrity.
3Productivity
If drying temperature is increased to reduce production time, then manufacturing efficiency improves, but probiotic bacteria are killed during the drying process
Solution Approach 1:
The patent changes the drying temperature parameter from conventional high temperatures to low temperatures (5-15°C). Although this reduces drying speed, the extended drying time at low temperature preserves probiotic bacteria viability. The use of low melting point gelatin compensates for the slower process by maintaining shell integrity during extended low-temperature drying.
4Reliability
If conventional packaging with high water activity is used, then capsule flexibility is maintained, but bacterial viability decreases due to moisture
Solution Approach 1:
The patent changes the water activity parameter of the capsule contents to a low range (0.15-0.25) that creates a protective environment for probiotic bacteria during storage. This parameter change reduces moisture availability to levels that extend bacterial shelf life while the gelatin shell maintains sufficient flexibility for capsule integrity.
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 method significantly improves the survival rate of probiotic bacteria during production and storage, achieving a high number of viable bacteria after 12 and 24 months, with soft gel capsules maintaining at least 4 E+09 CFU/g after 12 months and 2 E+09 CFU/g after 24 months at room temperature.
Implementation Method 1
encapsulating the fill material in a soft gel capsule made of a gelatin having a melting point in the range of 11 to 28°C
Implementation Method 2
drying the soft gel capsule in one or more steps at a temperature of at the most 25°C to a water activity of at the most 0.25
Data Source
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AI summary
The present invention provides a method for producing a soft gel capsule comprising uncoated probiotic bacteria, the method comprising gentle mixing the uncoated probiotic bacteria with at least one oil to obtain a soft gel capsule fill material at a temperature in the range of 5 to 15°C, encapsulating the fill material in a soft gel capsule made of a gelatin having a melting point in the range of 11 to 28°C; and drying the soft gel capsule in one or more steps to a water activity of at the most 0.25 at a temperature of at the most 25°C, as well as soft gel capsules produced by this method. The present invention further provides a soft gel capsule comprising dried, uncoated, non-spore-forming probiotic bacteria.