CN105004715A - High-sensitivity CO2 identification card - Google Patents
High-sensitivity CO2 identification card Download PDFInfo
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- CN105004715A CN105004715A CN201510345117.8A CN201510345117A CN105004715A CN 105004715 A CN105004715 A CN 105004715A CN 201510345117 A CN201510345117 A CN 201510345117A CN 105004715 A CN105004715 A CN 105004715A
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Abstract
The invention relates to a high-sensitivity CO2 identification card. The specific manufacturing comprises the steps that 1, indicating liquid is prepared, and bromothymol blue powder and methyl red powder are mixed to prepare the indicating liquid with the mixed powder concentration of 0.25 wt%; 2, an indicating working solution is prepared by dissolving the indicating liquid, glycerinum and methyl cellulose powder into distilled water; 3, 2 cm<3> of a polysulfone hollow fiber membrane and 30 ml of a indicating working solution are taken to be uniformly coated on the surface of the polysulfone membrane in a defect-free mode; aeration-drying is conducted for 10 hours at the indoor temperature to obtain the identification card. According to the high-sensitivity CO2 identification card, the used polysulfone hollow fiber membrane has certain porosity, gas is allowed to enter holes through multiple squares, the contact probability of the gas with the color indicating liquid in packaging can be increased, and the display accuracy degree and the recognition degree are increased.
Description
Technical field
The invention belongs to packaging accessory field, relate to a kind of high sensitivity CO
2tag card.
Background technology
In known technology, the storage of fruits and vegetables and controlled atmosphere, mainly adopt instrument to the CO in environment
2enter to detect, testing staff needs to possess higher educational level, and instrument cost is too high, needs periodic maintenance and maintenance, does not have universality.Develop a kind of fast, convenience, low price, indicative function be obvious, the CO with broad applicability
2responsive type indicating label is very necessary.
At present, consumer judges the freshness of food mainly through organoleptic analysis, and this method order of accuarcy is low, large with truth gap, easily safety problem occurs.Therefore, developing food products freshness indicating card, use is objective, the freshness of the method evaluation food of science has boundless prospect and potentiality.Domestic and international many companies and researcher are devoted to this work always, and in countries such as the U.S., food freshness indicating card is commercial applications in portioned product, achieves obvious progress.
The Cleaning Principle of food freshness indicating card is that some characteristic gas of utilizing food to produce in storage and particular agent produce that characteristic color reacts, temperature activation biologically and enzyme effect etc. cause indicating card to change, thus make a determination.And the base material of indicating card is the carrier of these color changing reagents or enzyme, the performance of base material will directly affect sensitivity and the stability of indicating card.
But the deixis of existing indicator is lower, needs higher concentration to change, and change not obvious, because the respiration of products such as fruit is stronger, produce more moisture, the Related products such as existing indicating card are easy mildew bacterium when long-term humidity, has a strong impact on testing result.
Summary of the invention
The object of the present invention is to provide a kind of high sensitivity CO
2tag card, adds antibacterial composition nano-ZnO in this designation card, can also improve detection sensitivity simultaneously.
The technical scheme that the present invention realizes object is:
A kind of high sensitivity CO2 tag card, the concrete steps of making are as follows:
(1) the preparation of indicator solution: Bromothymol blue powder is dissolved in 80wt% ethanolic solution with methyl red powder weight than for 2:3, use magnetic agitation 1h, powder dissolves completely, and solution colour is even, finally carry out ultrasonic process 10min, the concentration of preparation mixed-powder is the indicator solution of 0.25wt%;
(2) indicate the preparation of working fluid: indicator solution, glycerine and methylcellulose powder are dissolved in distilled water;
Indicator solution addition 5wt%, glycerine dosage 3-5wt%, methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
(3) get ps hollow fiber uf membrane 2cm
3, fetching is coated on polysulfone membrane surface with showing its even zero defect of working fluid 30ml; Aeration-drying 10 hours under room temperature, obtains tag card.
And (2) described step indicates the preparation of working fluid: indicator solution, glycerine, nano-ZnO and methylcellulose powder are dissolved in distilled water; Indicator solution addition 5wt%, glycerine dosage 3-5wt%, nano-ZnO 0.3wt% methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
Advantage of the present invention and good effect are:
1, the ps hollow fiber uf membrane that the present invention uses has certain porosity, allows gas squarely to enter hole from multiple, can increase the gas in packaging and the contact probability of colour developing indicator solution, increase display accuracy and resolution.
2, the present invention adds nano-ZnO in indicator solution, utilize the surface effect that nano-ZnO has, it is with under the condition of water and air, in the sun especially under ultraviolet irradiation, can the hole (h+) of the disintegrate electronegative electronics (e) that goes out to move freely and positively charged, there is stronger absorption magnetic action to carbon dioxide, increase detection sensitivity.
3, present invention employs the mixed indicator be made up of Bromothymol blue, methyl red two kinds of indicator, comprise Bromothymol blue, methyl red, the increase of indicating card color variable gradient, there is stronger visual impact, that also more removes indicates food freshness, provides convenient to consumer when buying.
4, the present invention adds nano-ZnO in indicator solution, can be effectively antibacterial, extends the term of life of designation card.
Embodiment
Describe embodiments of the invention in detail below, it should be noted that, the present embodiment is narrative, is not determinate, can not limit protection scope of the present invention with this.
The surface effect that the present invention utilizes nano-ZnO to have, it is with under the condition of water and air, in the sun especially under ultraviolet irradiation, can the hole (h+) of the disintegrate electronegative electronics (e) that goes out to move freely and positively charged, stronger suction-operated is had to carbon dioxide, there is antibacterial action simultaneously, effectively can extend the term of life of tag card.
Embodiment 1
A kind of high sensitivity CO2 tag card, the concrete steps of making are as follows:
(1) the preparation of indicator solution: Bromothymol blue powder is dissolved in 80wt% ethanolic solution with methyl red powder weight than for 2:3, use magnetic agitation 1h, powder dissolves completely, and solution colour is even, finally carry out ultrasonic process 10min, the concentration of preparation mixed-powder is the indicator solution of 0.25wt%;
(2) indicate the preparation of working fluid: indicator solution, glycerine and methylcellulose powder are dissolved in distilled water;
Indicator solution addition 5wt%, glycerine dosage 3-5wt%, methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
(3) get ps hollow fiber uf membrane 2cm
3, fetching is coated on polysulfone membrane surface with showing its even zero defect of working fluid 30ml; Aeration-drying 10 hours under room temperature, obtains tag card.
(4) the food freshness indicating card that prepared by the present invention can be used for instant detection (fruit, food) package interior CO
2concentration is the gas of 5% ~ 20%; Be positioned in packaging for foodstuff, CO
2concentration reaches the change of 0.9% visually distinguishable indicating card color.
Embodiment 2
Be with the difference of embodiment 1 with lower part in the present embodiment.
(2) indicate the preparation of working fluid: indicator solution, glycerine, nano-ZnO and methylcellulose powder are dissolved in distilled water;
Indicator solution addition 5wt%, glycerine dosage 3-5wt%, nano-ZnO 0.3wt% methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
Claims (2)
1. a high sensitivity CO2 tag card, is characterized in that: the concrete steps of making are as follows:
(1) the preparation of indicator solution: Bromothymol blue powder is dissolved in 80wt% ethanolic solution with methyl red powder weight than for 2:3, use magnetic agitation 1h, powder dissolves completely, and solution colour is even, finally carry out ultrasonic process 10min, the concentration of preparation mixed-powder is the indicator solution of 0.25wt%;
(2) indicate the preparation of working fluid: indicator solution, glycerine and methylcellulose powder are dissolved in distilled water;
Indicator solution addition 5wt%, glycerine dosage 3-5wt%, methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
(3) get ps hollow fiber uf membrane 2cm
3, fetching is coated on polysulfone membrane surface with showing its even zero defect of working fluid 30ml; Aeration-drying 10 hours under room temperature, obtains tag card.
2. high sensitivity CO2 tag card according to claim 1, is characterized in that: (2) described step indicates the preparation of working fluid: indicator solution, glycerine, nano-ZnO and methylcellulose powder are dissolved in distilled water; Indicator solution addition 5wt%, glycerine dosage 3-5wt%, nano-ZnO 0.3wt% methylcellulose addition 0.1wt%, stir 1h, ultrasonic process 10min, regulates solution ph to 9, obtains indicating working fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345117.8A CN105004715A (en) | 2015-06-19 | 2015-06-19 | High-sensitivity CO2 identification card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345117.8A CN105004715A (en) | 2015-06-19 | 2015-06-19 | High-sensitivity CO2 identification card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105004715A true CN105004715A (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510345117.8A Pending CN105004715A (en) | 2015-06-19 | 2015-06-19 | High-sensitivity CO2 identification card |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189620A (en) * | 2019-06-21 | 2019-08-30 | 上海海洋大学 | Fish freshness visual intelligent label, preparation method and application based on metalloporphyrin MOFs |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101695652A (en) * | 2009-10-29 | 2010-04-21 | 复旦大学 | Gas separation functional material and preparation method and application thereof |
| US20120203386A1 (en) * | 2011-02-04 | 2012-08-09 | Jim Fakos | Systems and methods for energy management and device automation system |
| CN104048958A (en) * | 2014-06-06 | 2014-09-17 | 天津科技大学 | Food freshness indicator card taking indicated CO2 as characteristic gas and manufacturing method thereof |
| CN104076121A (en) * | 2013-03-30 | 2014-10-01 | 天津市食品加工工程中心 | Preparation method of gel-type CO2 indicator |
| CN104076028A (en) * | 2013-03-30 | 2014-10-01 | 天津市食品加工工程中心 | CO2 sensitive type indicator label manufacturing method |
-
2015
- 2015-06-19 CN CN201510345117.8A patent/CN105004715A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101695652A (en) * | 2009-10-29 | 2010-04-21 | 复旦大学 | Gas separation functional material and preparation method and application thereof |
| US20120203386A1 (en) * | 2011-02-04 | 2012-08-09 | Jim Fakos | Systems and methods for energy management and device automation system |
| CN104076121A (en) * | 2013-03-30 | 2014-10-01 | 天津市食品加工工程中心 | Preparation method of gel-type CO2 indicator |
| CN104076028A (en) * | 2013-03-30 | 2014-10-01 | 天津市食品加工工程中心 | CO2 sensitive type indicator label manufacturing method |
| CN104048958A (en) * | 2014-06-06 | 2014-09-17 | 天津科技大学 | Food freshness indicator card taking indicated CO2 as characteristic gas and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189620A (en) * | 2019-06-21 | 2019-08-30 | 上海海洋大学 | Fish freshness visual intelligent label, preparation method and application based on metalloporphyrin MOFs |
| CN110189620B (en) * | 2019-06-21 | 2021-01-29 | 上海海洋大学 | Fish freshness visualization intelligent tag based on metalloporphyrin MOFs, and preparation method and application thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151028 |
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