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a to indicate co 2 Food Freshness Indicator Cards for Characteristic Gases

A characteristic gas and freshness technology, applied in the field of food freshness indicator cards and production, can solve problems such as easy occurrence of safety problems, large gaps in real conditions, low accuracy, etc. shelf life effect

Inactive Publication Date: 2017-11-07
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, consumers mainly judge the freshness of food through sensory analysis. This method has a low degree of accuracy and a large gap with the real situation, which is prone to safety problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] to indicate CO 2 A method for making a food freshness indicator card for a characteristic gas, the specific steps are as follows:

[0031] (1) Polylactic acid pretreatment: Use a high-speed universal pulverizer to pretreat the polylactic acid sample by pulverizing it, and pass through a 20-mesh sieve after pulverization to obtain polylactic acid powder;

[0032] (2) Production of polylactic acid-based film: polylactic acid powder is dissolved in chloroform, the solid-liquid ratio of polylactic acid and chloroform is 3:100 (w / v), heated in a water bath at 40°C for 30 minutes to accelerate the dissolution of polylactic acid, and spread on glass by casting method On the abrasive tool, dry at room temperature for 2 hours to prepare a polylactic acid base film (the recommended thickness of the base film is 50-100 μm);

[0033] (3) Preparation of indicator solution: The mass ratio of bromothymol blue powder to methyl red powder is 2:3 (w / w), dissolved in 70% ethanol solution...

Embodiment 2

[0039] to indicate CO 2 A method for making a food freshness indicator card for a characteristic gas, the specific steps are as follows:

[0040] (1) Polylactic acid pretreatment: Use a high-speed universal pulverizer to pretreat the polylactic acid sample by pulverizing it, and pass through a 20-mesh sieve after pulverization to obtain polylactic acid powder;

[0041] (2) Production of polylactic acid-based film: polylactic acid powder is dissolved in chloroform, the solid-liquid ratio of polylactic acid and chloroform is 3:100 (w / v), heated in a water bath at 40°C for 30 minutes to accelerate the dissolution of polylactic acid, and spread on glass by casting method On the abrasive tool, after drying at room temperature for 2 hours, the polylactic acid-based film was prepared;

[0042] (3) Preparation of indicator solution: The mass ratio of bromothymol blue powder to methyl red powder is 2:3 (w / w), dissolved in 70% ethanol solution (v / v), stirred by magnetic force for 1 hou...

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Abstract

The invention relates to a food freshness indicator card taking indicated CO2 as a characteristic gas and a manufacturing method of the food freshness indicator card. The manufacturing method comprises the following steps: firstly, crushing a polylactic acid sample, dissolving by chloroform, after heating in water bath, laying on a clean glass grinding tool through a tape-casting process, and drying to prepare a basal membrane; and dissolving bromothymol blue powder and methyl red powder in an ethanol solution, after stirring, uniformly mixing with polyethylene glycol and methylcellulose powder, laying on the basal membrane, drying to obtain the indicator card, independently packing the indicator card, and adding a drying agent into the indicator card for controlling the humidity surrounding the indicator card and improving the accuracy of discoloring generated after CO2 is absorbed by the indicator card. According to the manufacturing method, a self-made polylactic acid membrane is used as the indicator card basal membrane and is smooth in surface, uniform in texture and bright and translucent in appearance, and thus vision errors are furthest reduced. Due to invention and application of the freshness indicator card, consumers can purchase healthy and high-quality foods, and Chinese food safety is greatly improved.

Description

technical field [0001] The invention belongs to the field of food packaging, relates to the optimization of the polylactic acid film production process, especially a method to indicate CO 2 A food freshness indicator card for a characteristic gas and a production method thereof. Background technique [0002] Food freshness is one of the most important factors affecting food quality, safety, price and sales. It determines the purchase intention of consumers, the profits of manufacturers and sellers, and at the same time, it also affects the health and safety of consumers' diet. Therefore, how to identify the freshness of food has become a research hotspot in the food field. [0003] At present, consumers mainly judge the freshness of food through sensory analysis. This method has a low degree of accuracy and a large gap with the real situation, which is prone to safety problems. Therefore, developing the food freshness index card and evaluating the freshness of food with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78C08J7/04C08J5/18
Inventor 陈野邢玥
Owner TIANJIN UNIV OF SCI & TECH
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