Gamma-Stable Dextran Solutions for Blood Separation
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Solution Overview
Problem
Conventional methods for separating red blood cells from whole blood using dextran as an aggregant face challenges due to dextran's instability under gamma irradiation, leading to molecular weight decomposition and ineffective sedimentation performance below 200 kD, which complicates the manufacturing process and increases costs.
Innovation Solution
Development of gamma-stable dextran solutions with initial molecular weights greater than 500 kD and the addition of ascorbic acid or its mineral salts, allowing for direct incorporation into the manufacturing process and maintaining effective red blood cell sedimentation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dextran solution is sterilized by gamma irradiation, then sterilization is achieved, but dextran molecular weight decomposes severely
Solution Approach 1:
Ascorbic acid serves as a protective intermediary substance that absorbs or mitigates the harmful effects of gamma irradiation on dextran molecules. The ascorbic acid is mixed with the dextran solution before sterilization, creating a protective environment that allows the dextran to withstand gamma irradiation without severe molecular weight decomposition.
Solution Approach 2:
The ascorbic acid is added to the dextran solution before sterilization to provide pre-protection against the upcoming gamma irradiation stress. This beforehand cushioning prevents the dextran from suffering severe molecular weight decomposition when exposed to gamma rays, allowing effective sterilization while preserving dextran integrity.
2Ease of manufacture
If dextran molecular weight is reduced below 200 kD, then sterilization becomes easier, but RBC sedimentation performance becomes ineffective
Solution Approach 1:
Ascorbic acid acts as a protective intermediary that enables dextran to maintain its high molecular weight (>200 kD) structure during gamma irradiation sterilization. Without ascorbic acid, the dextran would decompose to low molecular weight forms that cannot effectively aggregate RBCs. The ascorbic acid ensures the dextran remains in the effective molecular weight range throughout sterilization.
3Stability of the object's composition
If dextran is sterilized separately by autoclaving or filtering, then dextran stability is maintained, but manufacturing complexity and contamination risk increase
Solution Approach 1:
The invention merges the sterilization function with the dextran solution itself by adding ascorbic acid as a built-in protective agent. This eliminates the need for separate sterilization steps (autoclaving or filtering) that would otherwise be required to maintain dextran stability. The ascorbic acid-containing dextran solution can be sterilized directly by gamma irradiation in the same manufacturing process stream, reducing complexity and contamination risk.
Solution Approach 2:
The ascorbic acid additive provides multiple functions: it protects dextran from gamma irradiation damage, enables direct gamma sterilization of the dextran solution, and maintains dextran molecular weight stability. This multi-functionality consolidates what would otherwise require separate manufacturing steps into a single integrated process.
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 gamma-stable dextran solutions enable efficient red blood cell aggregation and sedimentation, facilitating the recovery of a large percentage of total nucleated cells, thereby simplifying the blood separation process and reducing handling errors and costs.
Implementation Method 1
exposure to gamma irradiation at a dose between 20 and 50 kGy
Implementation Method 2
dextran in water is unstable to gamma irradiation resulting in severe molecular weight decomposition of the dextran
Implementation Method 3
dextran as an aggregant to enhance the sedimentation of red blood cells from whole blood
Implementation Method 4
RBC aggregation and sedimentation
Data Source
Figure 1
AI summary
Provided herein are gamma irradiation stable dextran solutions and kits that increase the efficiency of blood separation by allowing the dextran solution to be sterilized by exposure to gamma radiation and maintain sufficient molecular weight to act as a red blood cell aggregant. The solutions contain 1-10% wt/v dextran of an initial molecular weight greater than 500kD and 2-20 wt% ascorbic acid. A non-toxic enhancer like succinate or citrate can be added. Further provided are methods of use.