Related Experiment Videos
[On precipitation in clinical dextran solutions (author's transl)]
Der Anaesthesist
|October 1, 1977
Summary
Dextran precipitation retains its original molecular weight but forms aggregates. Temperature changes trigger a three-stage precipitation process involving association, microgel formation, and final precipitation.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Dextran precipitation is a critical process in various applications.
- Understanding the behavior of dextran during precipitation is essential for process optimization.
Purpose of the Study:
- To elucidate the molecular weight distribution changes during dextran precipitation.
- To identify the stages involved in temperature-induced dextran precipitation.
Main Methods:
- Analysis of molecular weight distribution of raw and precipitated dextran.
- Observation of precipitation stages under temperature changes.
Main Results:
- Dextran precipitation maintains the raw material's molecular weight distribution.
- High molecular weight associates (aggregates) are observed in precipitated dextran.
- Precipitation occurs in three distinct stages: association, microgel formation, and exsiccation/precipitation.
Conclusions:
- Dextran precipitation is characterized by aggregate formation alongside the preservation of the original molecular weight profile.
- Temperature-induced precipitation follows a sequential process crucial for understanding dextran's phase behavior.