Summary:
The sliced ​​cake is often in the form of a nitrogen-filled package, which prevents the sliced ​​cake from being crushed on the one hand and inhibits the oxidative deterioration and mildew of the sliced ​​cake on the other hand. However, many sliced ​​cakes are packaged in the storage process, and the concentration of nitrogen, oxygen and other gases in the package will change, resulting in the cake not meeting the specified shelf life. This paper uses the independent research and development of Jinan Languang Electromechanical Technology Co.
HGA-02
The head air analyzer analyzes the gas content in the sliced ​​cake package, and briefly introduces the testing principle and test process of the device, providing a quick and simple method for the enterprise to monitor the gas content in the package.
Key words
: gas content, oxygen content, nitrogen content, carbon dioxide content, gas ratio, nitrogen-filled packaging, modified atmosphere packaging, headspace analyzer, sliced ​​cake, pastry, pouch, mold
1
,significance
The sliced ​​cake tastes sweet, soft and delicious, and is delicious and tempting. It can be used as a nutritious breakfast and a companion for a tea. It is a popular pastry food. The rich nutrients and soft characteristics of the sliced ​​cake determine its easy to be oxidized and not resistant to extrusion. Therefore, it is often necessary to fill the package with a certain amount of nitrogen to extend the shelf life of the sliced ​​cake and maintain its shape integrity. Effect. Among them, the length of the shelf life of the sliced ​​cake is mainly related to the content of gas in the nitrogen-filled package. If the nitrogen content in the package is low and the oxygen content is increased, the anaerobic environment in which the sliced ​​cake is located is destroyed, and the effect of oxygen is Under the cake, the oil and fat components in the sliced ​​cake are easily oxidized, which is easy to breed microorganisms, which is characterized by the appearance of scent and mildew on the sliced ​​cake. Therefore, monitoring the gas content in the nitrogen-filled package is important to maintain a good quality of the sliced ​​cake.
2
,status quo
Sliced ​​cakes generally use a plastic composite film or an aluminized composite film as a packaging material. At present, there is no standard for testing methods related to the content of gas components inside the package at home and abroad, but the demand for detection of internal gas components is increasingly urgent.
Figure
1
Common sliced ​​cake packaging
3
Test sample
A brand of sliced ​​cake finished packaging.
4
,Testing Equipment
use
Labthink
Languang
HGA-02
The headspace air analyzer measures the gas content of the finished package of the sliced ​​cake.
Figure
2 HGA-02
Head air analyzer
4.1
Equipment principle
The device is equipped with an oxygen sensor and a carbon dioxide sensor to test the oxygen and carbon dioxide content of the package. For food packaging, the gas inside the package is mainly composed of three kinds, namely nitrogen, oxygen and carbon dioxide gas. The sum of the contents of these three gases can be approximated as
100%
Therefore, by testing the oxygen and carbon dioxide gas content in the package, the nitrogen content can be obtained.
4.2
Scope of application
This equipment is suitable for testing the content of oxygen and carbon dioxide in the hollow packaging containers such as sealed bags, bottles, cans, etc., such as coffee, cheese, milk tea, milk powder, bread, soy flour, ready-to-eat food, medicine and other sealed bags. Or container. This equipment is not only suitable for use in laboratories, but also for the rapid and accurate evaluation of gas component content and proportion in warehouses, production lines and other occasions.
4.3
Device parameters
l
The measurement range of oxygen is
0 ~ 100%
, the measured value is
0 ~ 2%
When the measurement accuracy is
±0.1% (
Absolute value
)
The measured value is
2% ~ 100%
When the measurement accuracy is
±0.5% (
relative value
)
.
l
The measurement range of carbon dioxide is
0 ~ 100%
, the measurement accuracy is
±2%
.
l
Both oxygen and carbon dioxide sensors use imported components to ensure the accuracy of the equipment.
l
Configure the micro printer to make it easy for users to print test results at any time.
l
Portable design and dual power supply mode for battery and battery, convenient for users to use in the laboratory or production site.
l
stand by
Lystem TM
Laboratory data sharing system, unified management test results and test reports.
5
,Experimental procedure
(1)
will
10
The bag-sliced ​​cake finished package sample is divided into two parts, of which
5
The bag is tested directly, the rest
5
The bag was placed for half a month before testing.
(2)
In the test, first set the test parameters such as sampling time and analysis time on the equipment.
(3)
Apply a gasket to the surface of the sample and insert the needle into the sample through the gasket. Be careful not to insert the needle into the sliced ​​cake to avoid clogging the needle.
Figure
3
Sample preparation diagram
(4)
Click the test button, the test starts, the instrument automatically displays the test results, namely oxygen and carbon dioxide.
6
,test results
Direct test
5
The average value of the oxygen content of the bag sample is
3.69%
, the content of carbon dioxide is
0.11%
, the nitrogen content is
96.20%
After being placed for half a month
5
The average value of oxygen content in each sample is
9.07%
, the carbon dioxide content is
0.12%
, the nitrogen content is
90.81%
.
7
,in conclusion
The gas content in the nitrogen-filled packaging and the modified atmosphere packaging has an important influence on the quality assurance effect of the contents, and the content of the gas components filled in the packaging is not constant during the whole product shelf life, so the monitoring of the gas component content in the packaging is enhanced. deep meaning.
HGA-02
The top air body analyzer is specially used for testing the content of gas components in sealed bags or packaging containers. The device is easy to operate and easy to carry, and the test results are accurate and reliable, which can truly reflect the gas composition inside the package.
Labthink
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