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Preparation method of gel-type CO2 indicator

An indicator, gel-type technology, applied in the field of preparation of gel-type CO2 indicator, can solve the problems of high instrument cost, lack of universality, and non-permanent use of gas sensing components, avoiding blind operation, The effect of saving the cost of instrument testing

Inactive Publication Date: 2014-10-01
天津市食品加工工程中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the storage and controlled atmosphere preservation of fruits and vegetables, it is necessary to control CO 2 Real-time monitoring, currently mainly using instruments to measure CO in the environment 2 However, the cost of the instrument is too high, and the gas sensing element of the instrument is not permanent and needs to be replaced regularly, which increases the storage cost, but it is not universal

Method used

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  • Preparation method of gel-type CO2 indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare a 10% ethanol solution;

[0016] Weigh 0.07 methyl red and dissolve in 100mL ethanol solution to obtain methyl red ethanol solution for subsequent use;

[0017] Weigh 0.15g bromothymol blue and dissolve in 100mL ethanol solution to obtain bromothymol blue ethanol solution for subsequent use; measure 10mL methyl red ethanol solution and 50mL bromothymol blue ethanol solution and mix, dilute 10 times to obtain indicator solution;

[0018] Take 100mL of the prepared indicator solution into a beaker, add 3mL of glycerin, heat in a constant temperature water bath at 55°C, put in 2.2g of methyl cellulose when the rated temperature is reached, take out the beaker and rapidly stir it continuously under a magnetic stirrer at a high speed. It forms a homogeneous methylcellulose solution. As the temperature decreases slowly, the viscosity of the solution increases. The resistance of the rotor is getting bigger and bigger, and when the rotor does not move, it is taken ou...

Embodiment 2

[0021] Prepare a 90% ethanol solution;

[0022] Weigh 0.12g methyl red and dissolve in 100mL ethanol solution to obtain methyl red ethanol solution for later use;

[0023] Weigh 0.08g bromothymol blue and dissolve in 100mL ethanol solution to obtain bromothymol blue ethanol solution for subsequent use;

[0024] Measure 55mL of methyl red ethanol solution and 15mL of bromothymol blue ethanol solution, mix them, and dilute 10 times to obtain indicator solution;

[0025] Take 100mL of the prepared indicator solution into a beaker, add 8mL of glycerin, heat in a constant temperature water bath at 80°C, put in 1.2g of methyl cellulose when the rated temperature is reached, take out the beaker and rapidly stir it continuously under a magnetic stirrer at a high speed. It forms a homogeneous methylcellulose solution. As the temperature decreases slowly, the viscosity of the solution increases. The resistance of the rotor is getting bigger and bigger, and when the rotor does not mov...

Embodiment 3

[0027] Prepare a 50% ethanol solution;

[0028] Weigh 0.09g methyl red and dissolve in 100mL ethanol solution to obtain methyl red ethanol solution for later use;

[0029] Weigh 0.12g bromothymol blue and dissolve in 100mL ethanol solution to obtain bromothymol blue ethanol solution for subsequent use;

[0030] Measure 25mL of methyl red ethanol solution and 35mL of bromothymol blue ethanol solution, mix them, and dilute 10 times to obtain indicator solution;

[0031] Take 100mL of the prepared indicator solution into a beaker, add 5mL of glycerin, heat in a constant temperature water bath at 80°C, put in 1.5g of methyl cellulose when the rated temperature is reached, take out the beaker and rapidly stir it continuously under a magnetic stirrer at a high speed. It forms a homogeneous methylcellulose solution. As the temperature decreases slowly, the viscosity of the solution increases. The resistance of the rotor is getting bigger and bigger, and when the rotor does not mov...

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Abstract

The invention relates to a preparation method of a gel-type CO2 indicator. The preparation method comprises the following steps: preparing a 10% to 90% ethanol solution; dissolving 0.07g to 0.12g of methyl red into 100ml of ethanol solution to obtain a methyl red ethanol solution; dissolving 0.08g to 0.15g of bromothymol blue into 100ml of ethanol solution to obtain a bromothymol blue ethanol solution; mixing 10ml to 55ml of methyl red ethanol solution with 15ml to 50ml of bromothymol blue ethanol solution, and diluting the mixture for 10 times to obtain an indicator solution; and adding glycerinum into 100ml of prepared indicator solution, heating the mixed solution in a water bath at the constant temperature of 55 to 80 DEG C, adding 1.2g to 2.2g of methylcellulose when the solution is at the target temperature, and continuously stirring the solution at a high speed to obtain a uniform methylcellulose solution. While the temperature is lowered, the viscosity of the solution is increased. When a rotor is stationary, the finished product is obtained. The indicator is suitable for rapid detection on CO2 with the content of 0 to 100 percent in an environment.

Description

technical field [0001] The invention relates to an indicator product, in particular to a gel-type CO 2 The preparation method of the indicator. Background technique [0002] During the storage and controlled atmosphere preservation of fruits and vegetables, it is necessary to control CO 2 Real-time monitoring, currently mainly using instruments to measure CO in the environment 2 However, the cost of the instrument is too high, and the gas sensing element of the instrument is not permanent and needs to be replaced regularly, which increases the storage cost, but it is not universal. To develop a CO 2 Sensitive indicator labels are necessary. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies in the above-mentioned prior art, and to provide a gel-type CO 2 The preparation method of the indicator. [0004] The object of the present invention is achieved through the following process steps: [0005] Prepare an ethanol ...

Claims

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Application Information

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IPC IPC(8): G01N31/22G01N21/78
Inventor 胡云峰崔瀚元贺业鑫
Owner 天津市食品加工工程中心
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