Method for calculating volume of internal void of microcapsule based on solute volatilization system

A technology of void volume and calculation method, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problems of moisture loss, long drying time, shrinkage and degeneration of microcapsules, etc., to achieve easy operation. , The effect of reagent configuration is simple

Active Publication Date: 2019-01-29
FUZHOU UNIVERSITY
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Problems solved by technology

Although this method is simple and easy to implement, there are deficiencies: one, water easily passes through the microcapsule membrane, no matter it is the holding of microcapsules or wiping off the surface water with paper, it will cause the loss of internal moisture, thereby Cause measurement deviation; second, when drying to constant weight, the microcapsules are severely shrunk and denatured, and it is difficult to redissolve in water, so they can no longer be used; third, the drying time is long, often more than 12 hours

Method used

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  • Method for calculating volume of internal void of microcapsule based on solute volatilization system
  • Method for calculating volume of internal void of microcapsule based on solute volatilization system
  • Method for calculating volume of internal void of microcapsule based on solute volatilization system

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preparation example Construction

[0021] The preparation method of the iodine water is as follows: Weigh 0.0953-0.1588g iodine element and 2.5g potassium iodide, dilute to 1L with 30% ethanol, and dilute 5 times after preparation to obtain 0.15-0.25mmol / L iodine aqueous solution.

[0022] The determination method of the iodine elemental concentration is: take 1mL of iodine water to be tested, add 0.4mL of 1ωt% soluble starch solution, dilute to 10mL with deionized water, oscillate and mix for color development, and measure the absorbance value at 590nm after color development , calculate the concentration of elemental iodine in the iodine water to be tested according to the iodine concentration standard curve.

[0023] The calculation method of the internal void volume of the microcapsule is: a part of iodine elemental substance in the iodine water outside the microcapsule volatilizes in the air, and the other part enters the inside of the microcapsule, and simultaneously enters and exits the microcapsule membr...

Embodiment 1

[0027] The microcapsules used are sodium alginate microcapsules, such as:

[0028] First, by figure 1 It can be seen that there is no color reaction between sodium alginate solution and iodine element, indicating that this method is suitable for sodium alginate microcapsules.

[0029] The preparation method of sodium alginate is as follows: 3mL of 3ωt% sodium alginate is mixed with 3mL of deionized water, then dripped dropwise into 100mL of 2ωt% calcium chloride dihydrate solution with a 1mL pipette gun, and immobilized for 60min.

[0030] Sodium alginate microcapsules were placed in 100mL iodine water with an iodine element content of 0.16mmol / L, magnetically stirred for 90min, samples were taken at regular intervals to measure the iodine element concentration, and the volatilization curve of iodine element was drawn. As a control, the internal void volume of the microcapsules was calculated according to the mass conservation and the iodine element concentration difference b...

Embodiment 2

[0042] The microcapsules used are sodium alginate-chitosan microcapsules, and the rest of the methods remain unchanged.

[0043] The preparation method of sodium alginate-chitosan microcapsules is as follows: mix 4mL of 2.5ω% sodium alginate solution with deionized water at a ratio of 8:1, drop into 1.5ω% calcium chloride dihydrate solution, fix After 1 hour, the prepared gel beads were reacted with 0.6ω% chitosan for 15 minutes, and then treated with 0.15ω% sodium alginate solution for 5 minutes, and finally liquefied with 0.055mol / L citric acid in the capsule 30min.

[0044] The final volume in the capsule was 0.6234±0.0021mL.

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Abstract

The invention relates to a method for calculating the volume of an internal void of a microcapsule based on a solute volatilization system. According to the method, the microcapsule is placed in iodine water; an iodine elementary substance not only is volatilized but also enters the microcapsule, and goes in and out of a capsule membrane all the time, so that the inside and outside solubility of the capsule can be balanced; and compared with iodine water in which the microcapsule is not placed, the concentration difference exists. According to the mass conservation and the concentration difference, the volume of the internal void of the microcapsule can be calculated. Compared with a traditional drying method, the method for calculating the internal void of the microcapsule has the advantages that the structure property of the microcapsule is not destroyed, and the time is saved.

Description

technical field [0001] The invention belongs to the calculation field of microcapsule internal void volume, and in particular relates to a calculation method of microcapsule internal void volume based on a solute volatilization system. Background technique [0002] Negatively charged polymers can form a spatial network structure with positively charged metal ions or polymers, forming microcapsules macroscopically. Microcapsules are widely used to embed spices, foods, drugs or to immobilize enzymes or cells for fermentation. People can roughly estimate the volume of the microcapsule according to the diameter of the microcapsule, but it is difficult to measure the volume of the internal void. The calculation method of the internal void volume of microcapsules in the current literature is: wipe off the surface moisture of the prepared microcapsules, weigh the total weight, then dry to constant weight, weigh the film weight, and subtract the two to get the microcapsules The we...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/088G01N15/0893
Inventor 倪莉周康熙刘志彬张雯张晨
Owner FUZHOU UNIVERSITY
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