Abstract: As a puffed food, donuts are generally packaged in a gas-filled package to prevent the doughnuts from being oxidized, crushed, and extended during shelf life. Therefore, it is necessary to strengthen the key monitoring of the gas composition inside the doughnut packaging to prevent the quality problems caused by the change of the proportion of the gas inside the package caused by the tight sealing of the packaging or the poor barrier property of the packaging material. In this paper, the internal gas composition of the donut nitrogen-filled package is tested by HGA-02 head air analyzer. The test process, test principle and equipment parameters are detailed, and detailed technical reference is provided for users in related industries.
Keywords: puffed food, donuts, packaging nitrogen, N 2 ratio, O 2 ratio, the headspace gas composition, headspace gas analyzer
1 , the status quo
Donuts are fried foods made from flour, white sugar, butter and eggs. They contain a lot of protein and fat. Therefore, in order to ensure that the doughnuts are not easily oxidized or crushed, more doughnut producers The inside of the package is filled with nitrogen ( N 2 ), that is, a nitrogen- filled package, and the inert gas of N 2 is used to prevent the presence of O 2 inside the package . If the packaging material used in the doughnut has poor barrier to N 2 and O 2 , or the doughnut package is poorly sealed, the content of N 2 or O 2 inside the package is liable to change, so that the nitrogen-filled package cannot be made. It plays a protective role for the donuts, and the doughnuts are not crispy or smeared. Therefore, the analysis of gas composition inside inflatable packaging is a major concern of many doughnut manufacturers.
In view of the above problems, effective detection equipment can be used to monitor the composition of the top air content inside the package, such as the head air analyzer, so as to grasp the specific proportion of O 2 and N 2 in the package, and timely control the quality of the finished packaging of the doughnut.
Figure 1 doughnut nitrogen filling package
2 , testing standards
At present, there is no targeted standard method for the detection of the top air body inside the domestic sealed package. However, there are many types of detection instruments for the top air body at home and abroad, and the technical level and accuracy of the instrument are also high, so the package is inside. The monitoring of the composition of the head air should have a certain universality. In this paper, the HGA-02 top air analyzer will be used to test the ratio of O 2 and N 2 gas in the doughnut modified atmosphere packaging (aluminum-plastic composite film) .
3 , test samples
Finished packaging of doughnuts produced by a food company.
4 , test equipment
The testing equipment used in this paper is the HGA-02 top air body analyzer independently developed by Labthink .
Figure 2 HGA-02 top air body analyzer
4.1 Test principle
The top air body analysis often uses the sensor method to insert the sampler into the package to be tested, and collect a sufficient volume of sample gas from the headspace of the package. The sample gas is injected into the gas analysis sensor, and the test data is recorded after a certain test time or after the gas concentration value output from the gas analysis sensor is stabilized. The detection of each gas content requires the use of different gas analysis sensors. When detecting the O 2 content in the sample gas, the sample gas needs to be injected into the O 2 analysis sensor, and the sample gas is required when detecting the CO 2 content in the sample gas. Inject the CO 2 analysis sensor.
4.2 Scope of application
(1) This equipment is suitable for testing the content of O 2 and CO 2 in a packaging container such as a sealed packaging bag or a packaging container, and the mixing ratio thereof.
- Sealed bag: suitable for the content of O 2 and CO 2 in various bags such as puffed food, ready-to-eat food, coffee, cheese, milk tea, milk powder, bread, soy flour, modified atmosphere packaging, medicine, etc. .
- Packaging container: It is suitable for the test of the content of O 2 and CO 2 and the mixing ratio thereof in packaging containers such as canned coffee, canned milk powder, canned food, cheese, canned food, Tetra Pak, and beverage .
(2) This equipment can be tested to test the content of gas O 2 and CO 2 at the top of ampoules and vials and their mixing ratio.
4.3 Equipment parameters
- Test gas type: O 2 , CO 2 .
- O 2 or CO 2 measurement range: 0 ~ 100% .
- O 2 measurement accuracy: 0% ~ 2% , ±0.3% (absolute value); 2% ~ 100% , ±0.5% (relative value).
- CO 2 measurement accuracy: 0% ~ 100% , ±0.5% (absolute value).
- The system is equipped with a bilingual operation environment in English and Chinese to meet the needs of users of different languages.
- Portable design, power and battery dual power mode, easy to use in the laboratory or production site.
- Support Lystem TM laboratory data sharing system to manage test results and test reports.
5 , the test process
(1) Take 5 samples with no obvious defects, leakage and good sealing, and stick the gasket to the part to be tested of the sample. Be careful to stick firmly to prevent air leaks.
(2) Turn on the instrument and warm up the instrument.
(3) Insert the sampling needle into the sample. After the sample is placed stably, the sampling needle is pierced into the middle of the sample into the inside of the sample, but the needle is prevented from being jammed or broken due to the needle being stuck into the package.
(4) Set test parameters such as test time, gas collection volume, etc.
(5) After the start of the test, the sampler automatically collects a sufficient volume of sample gas from inside the sample.
(6) The sample gas will automatically enter the gas analysis sensor through the injection port and pipeline.
(7) Record test data after a certain test time or after the gas concentration value output from the gas analysis sensor is stabilized.
6 , test results
5 samples in the internal headspace O 2 content ratio of an average value of 2.2%, and the deviation from the average value of each of the test sample is not more than ± 10%. Packaging for nitrogen, the internal gas in addition to O 2, the vast majority of the remaining N 2 (N 2 is an inert gas because, at home and abroad not develop respective gas sensors), the content ratio of the other gases is negligible, so The N 2 ratio content can be obtained by subtracting the proportion of O 2 from 100% .
7 , conclusion
The HGA-02 top air analyzer can accurately and conveniently determine the content of O 2 and CO 2 in the hollow packaging containers such as sealed bags, milk powder cans and ampoules, and their mixing ratios. It is suitable for quickly and accurately evaluating the content and proportion of gas components in production lines, warehouses, laboratories, etc., thereby guiding production and ensuring shelf life. Labthink has been committed to providing professional inspection services and testing equipment to customers around the world. Over the years, it has provided thousands of packages of internal gas composition monitoring solutions to customers around the world, providing reliable data support. Understand information concerning the relevant testing equipment more packaging barrier properties, mechanical properties, etc., you can visit the company Labthink Labthink view or call the consultation. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
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