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Special gas chromatograph for food packaging testing
Special gas chromatograph for food packaging testing
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Special gas chromatograph for food packaging testing
Gas chromatograph, chromatographic analyzer, chromatography method, chromatographic column,
Execution standard for gas chromatography in food packaging:GB/T1005-1998 Biaxially oriented polypropylene (BOPP)/low-density polyethylene (LDPE) composite film and bag specifies the residual limit and detection method of solvents
The main detection method for residual packaging solvents in edible packaging bags is to useGas chromatograph GC-7890 modelutilizegas chromatographyTo achieve detection.
Raw material control of food grade packaging bags: reduce raw material waste, gas chromatography can accurately detect the purity of incoming solvents, ensure the quality of incoming solvents, reduce product quality problems caused by solvent factors, and relatively save costs
Production process control, usinggas chromatographBased on the results of detecting solvent residues, the production process can be effectively adjusted to control solvents and provide accurate direction for effectively controlling residual exceedance. If n-propyl ester exceeds the standard, it can be immediately determined that the printing process needs to adjust process parameters to improve solvent volatilization efficiency; If the ethyl ester exceeds the standard, it can be determined that there is a problem with the dry recovery process and adjustments are needed;
Quality inspection of semi-finished products in printing: Testing semi-finished products in printing can effectively determine the solvent content index in the printing process, providing guidance for production quality control. Testing the composite process can effectively distinguish the solvent index in the composite process.
gas chromatographApplied in the food industry, it is mainly used to determine whether the solvent residue of the composite film used in the packaging exceeds the standard, whether it is necessary to redevelop the production process, and provide theoretical and technical support for whether the substrate used is appropriate. This can fundamentally control the production of excessive residue.
Select different types of ink according to the substrate to be printed, and use different mixed solvents for the same elbow with different types of ink. Residual solvents can affect consumers' physical health
There are many reasons for excessive solvent residue
For flexible packaging factories, there are many factors that can cause excessive solvent residue (odor), such as improper selection of substrates, non-standard production processes, outdated equipment, and lack of necessary testing and control in various production processes. All of these factors have a direct or indirect impact on excessive solvent residue (odor). Speaking of raw materials and substrates, factors such as ink quality, ink release, and ink coating thickness, adhesive quality and coating amount, organic solvent purity and proportion, and compatibility with the substrate will all affect the residual solvent content. In addition, inappropriate heating temperature, inadequate matching of air intake and exhaust volume, lack of standardized work instructions, improper operation by employees, inadequate printing speed during startup, insufficient additives, uneven coating, and arbitrary packaging materials for finished products are the main factors causing it to exceed the standard.
Experimental analysis of gas chromatographChromatographic conditions：
1： Instruments and reagents
Hydrogen flame ionization detector; Capillary column injection system; Chromatography workstation; Headspace sampling device;
2： Gas chromatography operating components
Capillarychromatographic columnThe color model is PEG-20 M 10 m * 0.53 mm * 2.65 μ m quartz capillary column;
Testing conditions: Column temperature: 70 ℃,
Gasification chamber temperature: 100 ℃,
Detector temperature: 110 ℃;
The carrier gas is high-purity nitrogen, with a flow rate of 30 mL/min and a split ratio of 1:4.
3： Preparation of standard gas
Extract calibrated ethyl acetate, butanone, isopropanol, and toluene, inject them into a evacuated gas distribution bottle, balance the internal and external pressures with a glass valve, and then gradually dilute them with air to prepare the standard gas series for use.
4： Cut the plastic food packaging bag with a film thickness of 0.01 mm into 5 mm × 5 mm fragments, weigh 2.0 g of this fragment and place it in a headspace bottle. Seal it with a stopper and preheat it at 85 ℃ for 30 minutes. Dilute it with air to 50 mL and take 1 mL of solid gas for injection. Measure the peak area of each component and calculate the corresponding content based on the standard curve.
Selection of chromatographic columns
Different polarity chromatographic stationary phases were selected for separation comparison, and the experimental results showed that the stationary phase PEG-20 M had the best separation effect. This article also compared the separation performance of PEG-20M packed columns, capillary columns, and large-diameter capillary columns. It was found that packed columns had poor separation efficiency, while capillary columns had good separation efficiency. However, due to the small column capacity, the accuracy and reproducibility of the determination were affected. Large caliber capillary columns have the characteristics of short retention time, high sensitivity, good separation effect, symmetrical peak shape without tailing, accurate quantification, and good reproducibility. Therefore, PEG-20 M large caliber capillary chromatography column was chosen. The Influence of Balancing Temperature and Time on Response Values
The main application areas of gas chromatography areApplication in various industries:
Most of the raw materials and products in the petrochemical industry can be analyzed using gas chromatography;
Can be used in the power sector to check for latent faults in transformers;
Can be used to monitor the quality of urban air and water in environmental protection work;
Can be used in agriculture to monitor pesticide residues in crops;
Can be used in the commercial sector to inspect and identify the quality of food;
It can be used in medicine to study human metabolism and physiological functions;
Used in clinical practice to distinguish drug poisoning or disease types;
It can be used in the spacecraft to automatically monitor the gas inside the sealed compartment.
Gas chromatograph, chromatographic analyzer, chromatography method, chromatographic column,
Execution standard for gas chromatography in food packaging:GB/T1005-1998 Biaxially oriented polypropylene (BOPP)/low-density polyethylene (LDPE) composite film and bag specifies the residual limit and detection method of solvents
The main detection method for residual packaging solvents in edible packaging bags is to useGas chromatograph GC-7890 modelutilizegas chromatographyTo achieve detection.
Raw material control of food grade packaging bags: reduce raw material waste, gas chromatography can accurately detect the purity of incoming solvents, ensure the quality of incoming solvents, reduce product quality problems caused by solvent factors, and relatively save costs
Production process control, usinggas chromatographBased on the results of detecting solvent residues, the production process can be effectively adjusted to control solvents and provide accurate direction for effectively controlling residual exceedance. If n-propyl ester exceeds the standard, it can be immediately determined that the printing process needs to adjust process parameters to improve solvent volatilization efficiency; If the ethyl ester exceeds the standard, it can be determined that there is a problem with the dry recovery process and adjustments are needed;
Quality inspection of semi-finished products in printing: Testing semi-finished products in printing can effectively determine the solvent content index in the printing process, providing guidance for production quality control. Testing the composite process can effectively distinguish the solvent index in the composite process.
gas chromatographApplied in the food industry, it is mainly used to determine whether the solvent residue of the composite film used in the packaging exceeds the standard, whether it is necessary to redevelop the production process, and provide theoretical and technical support for whether the substrate used is appropriate. This can fundamentally control the production of excessive residue.
Select different types of ink according to the substrate to be printed, and use different mixed solvents for the same elbow with different types of ink. Residual solvents can affect consumers' physical health
There are many reasons for excessive solvent residue
For flexible packaging factories, there are many factors that can cause excessive solvent residue (odor), such as improper selection of substrates, non-standard production processes, outdated equipment, and lack of necessary testing and control in various production processes. All of these factors have a direct or indirect impact on excessive solvent residue (odor). Speaking of raw materials and substrates, factors such as ink quality, ink release, and ink coating thickness, adhesive quality and coating amount, organic solvent purity and proportion, and compatibility with the substrate will all affect the residual solvent content. In addition, inappropriate heating temperature, inadequate matching of air intake and exhaust volume, lack of standardized work instructions, improper operation by employees, inadequate printing speed during startup, insufficient additives, uneven coating, and arbitrary packaging materials for finished products are the main factors causing it to exceed the standard.
Experimental analysis of gas chromatographChromatographic conditions：
1： Instruments and reagents
Hydrogen flame ionization detector; Capillary column injection system; Chromatography workstation; Headspace sampling device;
2： Gas chromatography operating components
Capillarychromatographic columnThe color model is PEG-20 M 10 m * 0.53 mm * 2.65 μ m quartz capillary column;
Testing conditions: Column temperature: 70 ℃,
Gasification chamber temperature: 100 ℃,
Detector temperature: 110 ℃;
The carrier gas is high-purity nitrogen, with a flow rate of 30 mL/min and a split ratio of 1:4.
3： Preparation of standard gas
Extract calibrated ethyl acetate, butanone, isopropanol, and toluene, inject them into a evacuated gas distribution bottle, balance the internal and external pressures with a glass valve, and then gradually dilute them with air to prepare the standard gas series for use.
4： Cut the plastic food packaging bag with a film thickness of 0.01 mm into 5 mm × 5 mm fragments, weigh 2.0 g of this fragment and place it in a headspace bottle. Seal it with a stopper and preheat it at 85 ℃ for 30 minutes. Dilute it with air to 50 mL and take 1 mL of solid gas for injection. Measure the peak area of each component and calculate the corresponding content based on the standard curve.
Selection of chromatographic columns
Different polarity chromatographic stationary phases were selected for separation comparison, and the experimental results showed that the stationary phase PEG-20 M had the best separation effect. This article also compared the separation performance of PEG-20M packed columns, capillary columns, and large-diameter capillary columns. It was found that packed columns had poor separation efficiency, while capillary columns had good separation efficiency. However, due to the small column capacity, the accuracy and reproducibility of the determination were affected. Large caliber capillary columns have the characteristics of short retention time, high sensitivity, good separation effect, symmetrical peak shape without tailing, accurate quantification, and good reproducibility. Therefore, PEG-20 M large caliber capillary chromatography column was chosen. The Influence of Balancing Temperature and Time on Response Values
The main application areas of gas chromatography areApplication in various industries:
Most of the raw materials and products in the petrochemical industry can be analyzed using gas chromatography;
Can be used in the power sector to check for latent faults in transformers;
Can be used to monitor the quality of urban air and water in environmental protection work;
Can be used in agriculture to monitor pesticide residues in crops;
Can be used in the commercial sector to inspect and identify the quality of food;
It can be used in medicine to study human metabolism and physiological functions;
Used in clinical practice to distinguish drug poisoning or disease types;
It can be used in the spacecraft to automatically monitor the gas inside the sealed compartment.
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