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Method for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric crystal

A technology of microcrystalline cellulose and cholesteric liquid crystal, applied in the field of liquid crystal materials, can solve problems such as the blank of ascidian cellulose, and achieve the effects of stable suspension, simple operation and environmental friendliness

Inactive Publication Date: 2010-12-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research and development of sea squirt cellulose is almost blank

Method used

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  • Method for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric crystal
  • Method for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric crystal
  • Method for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric crystal

Examples

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Embodiment 1

[0044] Example 1. A method for extracting microcrystalline cellulose from sea squirts. Include the following steps:

[0045] (1) Soak and wash the sea squirt with distilled water, dissect the sea squirt and discard the internal organs, leaving only the coat of the sea squirt, and then scrape off the outermost layer of thin skin and discard it, leaving only the rest;

[0046] (2) Soak the retained vesicle with strong alkali for 12 hours to remove the protein and lipid contained therein;

[0047] (3) Under the condition of 65°C, react the capsules from which proteins and lipids have been removed in a buffer solution containing bleach made from acetic acid and sodium hydroxide for 3 hours, and repeat this step 5 times, each time Renew the aforementioned buffer solution;

[0048] (4) Place the sample obtained in step (3) on a watch glass, and then put it into a constant temperature blast drying oven to dry at 40°C;

[0049] (5) After drying, pulverize it to micron or millimete...

Embodiment 2

[0052] Example 2. A method for extracting microcrystalline cellulose from sea squirts. Wherein the step (2) is to soak the retained vesicle with strong alkali for 24 hours to remove the protein and lipid contained therein; said strong alkali is 5wt% sodium hydroxide solution. Step (3) is to react the capsules from which proteins and lipids have been removed in a buffer solution containing bleach made from acetic acid and sodium hydroxide at 90°C for 1 hour, and repeat this step twice, each time Both need to refresh the aforementioned buffer solution; the bleaching agent is sodium chlorate. Step (4) is to place the sample obtained in step (3) on a watch glass, and then put it into a constant temperature blast drying oven to dry at 60°C. All the other are with embodiment 1.

Embodiment 3

[0053] Example 3. A method for extracting microcrystalline cellulose from sea squirts. Wherein the step (2) is to soak the retained vesicle with strong alkali for 6 hours to remove the protein and lipid contained therein; said strong alkali is 10wt% potassium hydroxide solution. Step (3) is under the condition of 40 ℃, will remove protein and lipid in the buffer solution containing bleaching agent made with acetic acid and sodium hydroxide to react for 5h, this step reaction is repeated 8 times, each time Both need to refresh the aforementioned buffer solution; the bleaching agent is sodium chlorite. Step (4) is to place the sample obtained in step (3) on a watch glass, and then put it into a constant temperature blast drying oven to dry at 20°C. All the other are with embodiment 1.

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Abstract

The invention relates to a method for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric crystal, which comprises the steps of: soaking the sea squirts with distilled water, cleaning and only reserving tunics with thin skin scraped out; soaking the tunics with strong base for 6-24h to remove protein and lipid; subjecting the tunics in a buffering solution at 40-90 DEG C to reaction for 1-5h, and repeating the step 2-8 times; placing obtained cellulose on watch glass for drying; crushing to a micrometer or millimeter level; pouring into a beaker containing a proper amount of concentrated acid for hydrolysis, stirring to react for 30min-6h, and adding a large amount of distilled water again for terminating the reaction; and repeatedly centrifuging and dialyzing to remove acid in suspension so as to ensure that the solution outside a dialysis bag to be neutral or subacid finally, and then evaporating for concentration to obtain the lyotropic cholesteric crystal. The method has simple reaction processes, easier control of technological method, rich raw material resources, low cost, good repeatability, environmental protection, no toxicity and lower cost, is easier for mass production, and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and more specifically relates to the innovation of methods for extracting microcrystalline cellulose from sea squirts and preparing lyotropic cholesteric liquid crystals. Background technique [0002] F.Reinitzer first observed the liquid crystal phenomenon in 1888. When he measured the melting point of organic matter, he found that some organic matter would form an opaque turbid liquid after melting; continue heating to become a transparent anisotropic solution. Because the mesophase of the turbid liquid has properties similar to crystals, it is named liquid crystal. [0003] It is well known that liquid crystal materials can be used as displays. But in addition, it is also used in many fields, for example, the foam in detergent is a kind of lyotropic liquid crystal. Lamellar liquid crystals can be used as lubricants because they can slide relative to each other. Some high-m...

Claims

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Application Information

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IPC IPC(8): D21B1/02
Inventor 朴光哲张丽红宋广杰李健荣木村恒久
Owner QINGDAO UNIV OF SCI & TECH
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