A method for preparing chitosan oligosaccharides by ultrasonic-hydraulic cooperative cavitation

A technology of oligomeric chitosan and hydraulic cavitation, which is applied in the field of preparation of oligomeric chitosan, can solve problems such as energy waste, weakening, and unstable functions, and achieve the effects of high efficiency and low energy consumption

Active Publication Date: 2018-04-10
GUANGXI UNIVERSITY OF TECHNOLOGY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This heating not only causes waste of energy, but also is not conducive to the treatment of heat-sensitive substances (such as biology, medicine, etc.); another serious problem of ultrasonic cavitation, in the limited space conditions of laboratories and small-scale small containers, The effect is good, but when the application is scaled up to pilot scale or larger, there will be very unstable functional weakening phenomenon

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing chitosan oligosaccharides by ultrasonic-hydraulic cooperative cavitation
  • A method for preparing chitosan oligosaccharides by ultrasonic-hydraulic cooperative cavitation
  • A method for preparing chitosan oligosaccharides by ultrasonic-hydraulic cooperative cavitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of method utilizing ultrasonic-hydraulic cooperative cavitation to prepare chitosan oligosaccharides comprises the following steps:

[0037] The first step: dissolving chitosan: adding high-molecular-weight chitosan into a solvent and dissolving it to form a chitosan solution, the solvent being one of an aqueous solution of inorganic acid, an aqueous solution of organic acid or a slightly acidic buffer solution, Wherein, the mass concentration of the described inorganic acid aqueous solution or organic acid aqueous solution is 1%-13%, the pH of the buffer solution is 3-5, and the mass concentration of the chitosan solution is 1g / L-10g / L, the relative molecular mass of the high molecular weight chitosan is greater than 2×10 6 , the degree of deacetylation is greater than 60%; the inorganic acid is hydrochloric acid, the organic acid is formic acid, acetic acid, lactic acid or citric acid, and the buffer solution is acetic acid-sodium acetate or citr...

Embodiment 2

[0052] Embodiment 2: a kind of method utilizing ultrasonic-hydraulic synergistic cavitation to prepare chitosan oligosaccharide, it is basically the same as embodiment 1, difference is: the structure of ultrasonic-hydraulic cavitator is different, the described in this embodiment Ultrasonic-hydrodynamic cavitator4 (eg Figure 4 (shown) is composed of an ultrasonic transducer 41 and a hydraulic cavitation device, and the ultrasonic transducer extends into the hydraulic cavitation device to generate ultrasonic waves. The hydraulic cavitation device is a Venturi tube 46, and the Venturi tube is followed by an inlet section 461, a contraction section 462, a throat 463, a diffusion section 464 and an outlet section 465 along the material flow direction, and the inlet section 461 has a material inlet 466, The ultrasonic transducer extends into the inlet section, the ratio of the angle α of the contraction section to the angle β of the divergence section is 0.5~2, and the ratio of th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
degree of deacetylationaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing chitosan oligosaccharide by utlizing ultrasonic-hydraulic collaborative cavitation. The method is characterized by performing ultrasonic-hydraulic cavitation degrading treatment on a chitosan solution in an ultrasonic-hydraulic cavitation device by adopting ultrasonic-hydraulic collaborative cavitation degrading, wherein the ultrasonic-hydraulic cavitation device comprises a constant-temperature water bath circulating water tank, a storage tank, a pump, an ultrasonic-hydraulic cavitator, a pipeline for conveying the chitosan solution, a pressure gauge and a valve. The technological process comprises the following steps: putting the chitosan solution into the storage tank, stabilizing the temperature through the circulating water tank, conveying the chitosan solution to the ultrasonic-hydraulic cavitator through the pump for cavitation degrading, adjusting the inlet pressure through the valve, and monitoring the pressure through the pressure gauge, wherein the chitosan solution subjected to cavitation degrading flows back into the storage tank. Compared with the degrading rate of the existing hydraulic cavitation device (a Venturi tube) for preparing the chitosan oligosaccharide, the degrading rate of the method disclosed by the invention is improved by at least 70 percent; the method has the characteristics of simplicity, convenience, feasibility, low energy consumption, high efficiency and the like, and has the advantage of large-scale industrial application.

Description

technical field [0001] The invention relates to a method for preparing chitosan oligosaccharides, in particular to a method for preparing chitosan oligosaccharides by means of ultrasonic-hydraulic cooperative cavitation. Background technique [0002] Generally, chitosan obtained by deacetylation of chitin has a large molecular weight and a compact crystal structure. It is insoluble in common solvents and can only be dissolved in some acidic media, which greatly limits the application of chitosan. limit. In addition, studies have shown that the properties of chitosan with different relative molecular weights are very different, and sometimes even show diametrically opposite characteristics. Many specific functions of chitosan can only be manifested when the relative molecular weight is reduced to a certain extent. The oligomeric water-soluble chitosan obtained by degrading chitosan has unique and superior physiological activity and physicochemical properties, and has a wide ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): C08B37/08
CPCC08B37/003
Inventor黄永春杨锋李利军许佳丽任仙娥黄承都黄琼谢清若张昆明
OwnerGUANGXI UNIVERSITY OF TECHNOLOGY