Abstract: The total amount of migratory substances in soy milk cup is an important factor affecting the safety of soy milk. This paper tests the total migration of migratory materials in disposable paper cups of a brand of packaged soy milk using C830 migration and non-volatiles analyzer. Through the description of the test process, equipment parameters and scope of application, test principle, etc., a test method for the total migration of packaging materials is introduced, which provides a reference for enterprises to control product quality.
Key words: total migration, migratory, migration and non-volatiles analyzer, soy milk cup, disposable paper cup
1, meaning
Soymilk is one of the traditional cuisines in China. It contains rich nutrients such as plant protein, phospholipids, vitamins, calcium and iron. It is a nutritious food for all ages. With the accelerated pace of life, the traditional methods of making soy milk and drinking culture have undergone major changes. The soy milk packaged in disposable paper cups is a kind of packaging form that is suitable for fast-paced life.
Usually, the inner layer of the paper cup contains a layer of plastic coating to prevent leakage when the soy milk is packaged or the paper cup is wetted and softened. In the process of contact with the soybean milk, some additives are added to the plastic film to ensure its performance. Or small molecules that are not fully involved in the reaction will migrate outward and enter the soy milk, which may affect the health of the consumer. The migration rate and migration amount of these substances generally change with the temperature of soybean milk and the contact time of soy milk and paper cup. Therefore, the appropriate soymilk mimetic is selected, and the packaged soybean milk is used by setting suitable migration temperature and migration time. Monitoring the total amount of migrables in disposable cups is one of the important guarantees for the safe drinking of soy milk.
Figure 1 Common paper cups for soy milk packaging
2. Test basis
The standard on which this test is based is GB 31604.1-2015 "Food Safety National Food Contact Materials and Products Migration Test General Rules", GB 5009.156-2016 "Food Safety National Food Food Contact Materials and Products Migration Test Pretreatment Methods General Principles", GB 31604.8-2016 "Determination of the total migration of food contact materials and products by the National Food Safety Standard", wherein the first two standards specify the food simulants, test conditions and test methods for the migration test, and the last standard specifies the migration test. After the end, how to test the total content of the migratory liquid in the simulated liquid.
3, test samples
The test samples tested in this paper are disposable paper cups for a certain brand of soy milk packaging.
4, test equipment
The test equipment used in this paper is C830 migration and non-volatiles analyzer, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 C830 migration and non-volatiles analyzer
4.1 Principle of the test
The total migration test is a test process in which the migration of the food material to the food simulant is carried out by simulating the contact process between the food and the packaging material, and the total amount of the migration product is tested by an evaporation-drying-weighing process. . Therefore, the whole experiment is divided into two parts: the migration process and the test process.
4.2 Scope of application
(1) This equipment is suitable for the determination of the total migration of food contact materials and products.
(2) Applicable to the determination of non-volatiles in packaging materials for pharmaceuticals.
(3) Expanded for the determination of total solids, moisture and loss on drying and fat in the food industry. Such as the total solids of liquor products, the total solids and non-sugar solids of rice wine products, the determination of total solids of beverages and beverages, etc.; the moisture content of meat and meat products and fats Determination, etc.
(4) Meet GB 31604.8, GB 9740, ISO 759, YBB00342002, YBB00132002 and other related countries and pharmaceutical packaging materials standards.
4.3 Equipment parameters
The test range is 0.1 ~ 80,000 mg, the resolution is 0.01 mg; the test temperature range is from room temperature to 130 °C, the temperature control accuracy is ±0.3 °C; the evaporation, drying and weighing are integrated, which can automatically and accurately weigh, the test process No need to participate manually; the volatile reagents can be collected and processed in the airtight system, and the requirements for the laboratory ventilation system are low; the international leading rapid evaporation technology is used to shorten the evaporation time; 9 station design, test The process is independent of each other and the test efficiency is high; through the special design of the constant temperature chamber and the weighing system, the test accuracy of the equipment is greatly improved.
5, the test process
5.1 Migration Process
(1) The samples tested in this time are used to package soybean milk. According to the relevant regulations in GB 31604.1, the corresponding food simulant is 20% (volume fraction) ethanol, and the migration condition is 70 °C, 2 h.
(2) Calculate the sum of the bottom area of ​​the sample and the area of ​​the inner wall from the bottom of the cup to 1 cm from the mouth of the cup.
(3) 20% ethanol having reached 70 ° C was added to the sample until the liquid level was 1 cm from the mouth of the cup, and the volume of the added food simulant was recorded.
(4) Place the sample containing the simulated liquid in an environment of 70 ° C for 2 h.
5.2 Testing process
(1) Take 200 mL of the simulated solution from the sample and place it in a dry and weighed evaporating dish, and take the same volume of blank simulant for the blank test.
(2) Place the evaporating dish on the tray holder in the equipment chamber and close the test chamber door. Set parameters such as evaporation temperature, test mode, drying temperature, drying time, etc. Click the test option and the test starts.
(3) The equipment automatically evaporates, dries, and weighs according to the set parameters. After the test is over, the device displays the calculation results. The evaporation reagent that is automatically recovered by the processing equipment.
6, test results
A total of 2 samples were tested in this test, and the total migration amount tested for each sample was 4.13 mg/dm2 and 4.21 mg/dm2, respectively. The average of the test results of the two samples was taken as the total migration amount of the sample, which was 4.17 mg/dm2.
7. Conclusion
The total migration is an evaluation of the total amount of migratory substances in food contact materials. This paper introduces the test method of total migration by testing the total amount of migrables in disposable paper cups for packaging soymilk. From the test process, the whole test operation is simple, the equipment can automatically evaporate, dry, weigh, and recover the evaporation reagent. The test results show that the total migration of the tested sample is within the standard requirement (≤ 10 mg/dm2). Within the scope. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and testing services for packaging testing equipment. The existing equipment can test the barrier properties of packaging materials for oxygen, water vapor, nitrogen, carbon dioxide and other gases, tensile, Peeling, heat sealing, enthalpy, friction coefficient and other physical and mechanical properties and solvent retention, total migration, non-volatiles and other hygienic properties, understand the relevant equipment parameters and testing services, you can visit to view. The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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