Phthalate esters (PAEs) are the main plasticizers and softeners used in the plastic industry. Their function is to increase the plasticity and toughness of plastics, improve their strength, and their content can reach up to 50% of the final product. Due to the lack of chemical covalent bonds between phthalate plasticizers and plastic matrices, they dissolve when in contact with water, oil, and other substances contained in packaged foods. Moreover, the higher the content of phthalate plasticizers in plastics, the more they may dissolve. Research has confirmed that phthalates have chronic toxicity, mutagenicity, carcinogenicity, and reproductive and developmental toxicity to animals and humans, making them one of the most widely present chemical pollutants in the field. At present, research on the distribution of phthalate esters in the environment has been relatively in-depth, but the phenomenon of phthalate esters contaminating food through various pathways has not received sufficient attention. This article uses capillary column gas chromatography (GC-FID) technology to quantitatively analyze the dissolution of phthalate esters in 11 different brands of plastic food bags and packaged foods. Explored the contamination status of phthalate esters transferred to food during the use of plastic food bags.

GC-2010Gas chromatograph operating conditions, carrier gas: N2;Flow rate: 0.8 mL/min; Chromatography column: HP-5MS capillary column (30.0m × 320 μ m × 0.25 μ m);Injection method: no diversion; Injection volume: 1-5 μ L; Injection port temperature: 250 ℃; Detector: FID, 300℃; Heating program: 150 ℃ (3 minutes), (15 ℃/min) → 300 ℃ (4 minutes).

Phthalate acid ester gas chromatogram

Instrument configuration and reagents

GC-2020 gas chromatographPerformance characteristics

1. Adopting320 x 240dot matrix5.7An inch large screen LCD Chinese display, real-time display of various temperatures and operating conditions, clear and intuitive content, truly realizing human-machine dialogue;
2Power on self-test, wide range self diagnostic function, can accurately determine the fault location and alarm;
3Six independent temperature controls (vaporization chamber and capillary vaporization chamber can be independently controlled), Five level program heating function;
4Overtemperature Protection function: If any circuit exceeds the set temperature, the instrument will automatically power off and sound an alarm;
5The vertical heating device of * makes sample vaporization more reliable, reduces the heat radiation generated in the vaporization chamber to the minimum, and ensures minimal temperature deviation inside the column box;
6Intelligent fuzzy control rear door opening system, automatically tracks temperature and dynamically adjusts The angle of the air door can achieve precise temperature control even near room temperature;
7Configure filling column head injection, glass lining injection, with diaphragm cleaning Functional capillary diversion/Non split injection device and capable of installing gas injectors;
8High precision dual stable gas path, capable of installing four types of detectors simultaneously;
9Optional electronic flow pressure display system with built-in workstation device.

Temperature control indicators
1.Temperature control range: room temperature 5℃～400℃increment0.1℃
2.Temperature control accuracy: superior to±0.01℃

Program heating: Five step interval constant temperature time0～999minincrement0.1minTemperature increment0.1℃
Heating rate:200℃The biggest one below40℃/min200℃Up to the biggest20℃/min