CN104076121A - Preparation method of gel-type CO2 indicator - Google Patents

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

A kind of gel-type CO 2the preparation method of indicator

Technical field

The present invention relates to a kind of indicator product, be specifically related to a kind of gel-type CO₂the preparation method of indicator.

Background technology

When the storage of fruits and vegetables and controlled atmosphere, need to be to CO₂carrying out Real-Time Monitoring, is mainly at present to adopt instrument to the CO in environment₂enter to detect, but instrument cost is too high, and the gas sensing original paper usability of instrument impermanent, needing periodic replacement, this has all improved storage cost, but it does not have universality.Develop a kind of fast, convenience, low price, indicative function be obvious, the CO with broad applicability₂responsive type indicating label is very necessary.

Summary of the invention

The object of the invention is to overcome the deficiency that above-mentioned prior art exists, a kind of gel-type CO is provided₂the preparation method of indicator.

Object of the present invention realizes by following processing step:

Compound concentration is 10%～90% ethanolic solution;

Take 0.07～0.12g methyl red and be dissolved in 100mL ethanolic solution, obtain methyl red ethanolic solution standby;

Take 0.08～0.15g bromthymol blue and be dissolved in 100mL ethanolic solution, obtain bromthymol blue ethanolic solution standby;

Measure 10～55mL methyl red ethanolic solution and mix with 15～50mL bromthymol blue ethanolic solution, dilute 10 times, obtain indicator solution;

Get indicator solution that 100mL makes in beaker, add 3～8mL glycerine, in 55～80 ℃ of thermostat water baths, heat, while arriving rated temperature, drop into 1.2～2.2g methylcellulose, take out beaker and rapidly under magnetic stirring apparatus constantly high-speed stirred make it form even methocel solution.With temperature, slowly decline, solution viscosity increases.Rotor resistance is increasing, when rotor is motionless, takes out, and obtains finished product.

The beneficial effect that the present invention has is:

The present invention can utilize the CO in change color display environment₂content, by CO invisible in pack environment₂gas content turns to visual color index, facilitates user to understand gas content and changes, and has both saved instrument testing cost, has avoided again blindly operation.

Accompanying drawing explanation

Fig. 1 is this gel-type CO₂the standard color comparison card of indicator, indication be CO in environment₂content is the color in 0,1.8%, 4.1%, 8.3%, 12.7%, 26.0%, 50.5%, 84.6% time respectively.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, not departing under the prerequisite of the present invention's conception, can also make some distortion and improvement.These all belong to protection scope of the present invention.

Embodiment 1

Compound concentration is 10% ethanolic solution;

Take 0.07 methyl red and be dissolved in 100mL ethanolic solution, obtain methyl red ethanolic solution standby;

Take 0.15g bromthymol blue and be dissolved in 100mL ethanolic solution, obtain bromthymol blue ethanolic solution standby; Measure 10mL methyl red ethanolic solution and mix with 50mL bromthymol blue ethanolic solution, dilute 10 times, obtain indicator solution;

Get indicator solution that 100mL makes in beaker, add 3mL glycerine, in 55 ℃ of thermostat water baths, heat, while arriving rated temperature, drop into 2.2g methylcellulose, take out beaker and rapidly under magnetic stirring apparatus constantly high-speed stirred make it form even methocel solution.With temperature, slowly decline, solution viscosity increases.Rotor resistance is increasing, when rotor is motionless, takes out, and obtains finished product.

This indicator is applicable to CO in environment₂content is in 0～100% fast detecting.

Embodiment 2

Compound concentration is 90% ethanolic solution;

Take 0.12g methyl red and be dissolved in 100mL ethanolic solution, obtain methyl red ethanolic solution standby;

Take 0.08g bromthymol blue and be dissolved in 100mL ethanolic solution, obtain bromthymol blue ethanolic solution standby;

Measure 55mL methyl red ethanolic solution and mix with 15mL bromthymol blue ethanolic solution, dilute 10 times, obtain indicator solution;

Get indicator solution that 100mL makes in beaker, add 8mL glycerine, in 80 ℃ of thermostat water baths, heat, while arriving rated temperature, drop into 1.2g methylcellulose, take out beaker and rapidly under magnetic stirring apparatus constantly high-speed stirred make it form even methocel solution.With temperature, slowly decline, solution viscosity increases.Rotor resistance is increasing, when rotor is motionless, takes out, and obtains finished product.

Embodiment 3

Compound concentration is 50% ethanolic solution;

Take 0.09g methyl red and be dissolved in 100mL ethanolic solution, obtain methyl red ethanolic solution standby;

Take 0.12g bromthymol blue and be dissolved in 100mL ethanolic solution, obtain bromthymol blue ethanolic solution standby;

Measure 25mL methyl red ethanolic solution and mix with 35mL bromthymol blue ethanolic solution, dilute 10 times, obtain indicator solution;

Get indicator solution that 100mL makes in beaker, add 5mL glycerine, in 80 ℃ of thermostat water baths, heat, while arriving rated temperature, drop into 1.5g methylcellulose, take out beaker and rapidly under magnetic stirring apparatus constantly high-speed stirred make it form even methocel solution.With temperature, slowly decline, solution viscosity increases.Rotor resistance is increasing, when rotor is motionless, takes out, and obtains finished product.

This indicator is applicable to CO in environment₂content is in 0～100% fast detecting.

Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (1)

1. a gel-type CO₂the preparation method of indicator, is characterized in that, described preparation method comprises following processing step:

(1) ethanolic solution that compound concentration is 10%～90%;

(2) take 0.07～0.12g methyl red and be dissolved in 100mL ethanolic solution, obtain methyl red ethanolic solution standby;

(3) take 0.08～0.15g bromthymol blue and be dissolved in 100mL ethanolic solution, obtain bromthymol blue ethanolic solution standby;

(4) measure 10～55mL methyl red ethanolic solution and mix with 15～50mL bromthymol blue ethanolic solution, dilute 10 times, obtain indicator solution;

(5) get the indicator solution that 100mL step (4) makes, add 3～8mL glycerine, in 55～80 ℃ of waters bath with thermostatic control heating, while arriving rated temperature, drop into 1.2～2.2g methylcellulose, take out and rapidly under magnetic stirring apparatus constantly high-speed stirred make it form even methocel solution.With temperature, slowly decline, solution viscosity increases.Rotor resistance is increasing, when rotor is motionless, takes out, and obtains finished product.