Ultrasonic degradation of aqueous dextran: Effect of initial molecular weight and concentration

It was observed that when very dilute solutions of hydrogen peroxide were employed for the purpose of destroying pyrogens in aqueous dextran solutions, a marked depolymerization of the polysaccharide molecule occurred. Further study demonstrated this effect to occur over a wide range of temperature, pressure, time, and concentration of hydrogen peroxide. It was therefore possible to use hydrogen peroxide in place of the usual hydrolytic agents, such as acids, for the depolymerization of native dextran to smaller molecular weight fragments suitable for use as a blood plasma extender.

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Analysis on Influencing Factors of Degradation of Water Treatment with Ultrasonic Wave Based on GPC

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.484-485.501 ◽

2014 ◽

Vol 484-485 ◽

pp. 501-506

Author(s):

Hou Wang Li ◽

Shu Sha Zhao

Keyword(s):

Molecular Weight ◽

Water Treatment ◽

Ultrasonic Wave ◽

Influencing Factors ◽

Pollution Control ◽

Ultrasonic Frequency ◽

Long Duration ◽

Ultrasonic Technology ◽

Ultrasonic Degradation ◽

Frequency Power

To promote the application of the ultrasonic technology in pollution control, the introduction and the analysis of development of this technology, the basic theory of ultrasonic degradation and the influencing factors of ultrasonic degradation were studied in this paper. The analysis of molecular weight and distribution of wastewater and the elaboration of the influences of the ultrasonic frequency, power and the duration on the degradation were conducted by GPC. And an objective and reasonable explanation was advanced: in a certain range, proper increase of the ultrasonic frequency, power or duration would enhance its degradation; but excessive increase of the frequency, power or the increase of temperature due to long duration would decrease the degradation.

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Mass Spectrometric Analysis for High Molecular Weight Synthetic Polymers Using Ultrasonic Degradation and the Mechanism of Degradation

Analytical Chemistry ◽

10.1021/ac062304v ◽

2007 ◽

Vol 79 (11) ◽

pp. 4182-4187 ◽

Cited By ~ 38

Author(s):

Hideya Kawasaki ◽

Yoshiki Takeda ◽

Ryuichi Arakawa

Keyword(s):

Molecular Weight ◽

High Molecular Weight ◽

Synthetic Polymers ◽

Mass Spectrometric ◽

Mass Spectrometric Analysis ◽

Spectrometric Analysis ◽

Mechanism Of Degradation ◽

Ultrasonic Degradation

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DEPOLYMERIZATION OF DEXTRAN BY HYDROGEN PEROXIDE

Canadian Journal of Biochemistry and Physiology ◽

10.1139/o55-058 ◽

1955 ◽

Vol 33 (3) ◽

pp. 448-452 ◽

Cited By ~ 6

Author(s):

Irving Levi ◽

Ezra Lozinski

Keyword(s):

Hydrogen Peroxide ◽

Molecular Weight ◽

Blood Plasma ◽

Dilute Solutions ◽

Pressure Time ◽

Wide Range ◽

Aqueous Dextran

It was observed that when very dilute solutions of hydrogen peroxide were employed for the purpose of destroying pyrogens in aqueous dextran solutions, a marked depolymerization of the polysaccharide molecule occurred. Further study demonstrated this effect to occur over a wide range of temperature, pressure, time, and concentration of hydrogen peroxide. It was therefore possible to use hydrogen peroxide in place of the usual hydrolytic agents, such as acids, for the depolymerization of native dextran to smaller molecular weight fragments suitable for use as a blood plasma extender.

Download Full-text