Applied Mechanics and Materials Vol. 469

Abstract: An investigation on the migration of various migrants from paper (board) into solid food simulants was undertaken to determine the correlation of partition coefficients between food simulants / paper, K_F,P, and octanol/water, K_O,W. The migration tests were carried out using four solid food simulants (rice powder, milk powder, white sugar and rice) in contact with a kind paper which was spiked with 5 compounds. These model migrants cover a wide range of potential migrants in paper (board) food packaging materials and can be characterized by octanol/water partition coefficients ranging from log K_O,W = 2.293 to 4.496. In all simulants a correlation of increasing log K_{O, W} with increasing log K_F,P was found. Using the correlation line as a calibration curve, log K_{F, P} can be predicted from the log K_{O, W} values of the migrants for a given food stimulant. This approach is a new estimation procedure to obtain K_{F, P} values from easily accessible K_O,W values which can significantly reduce the efforts for compliance assessment by minimizing time and costs to be spent compared to carrying out an enormous number of specific migration test. Furthermore, this approach will support experimental migration testing since it provides a method to determine which simulant is appropriate for a given foodstuff.

Abstract: In this study, High Performance Liquid Chromatography (HPLC), combined with Triple Quadruple mass Spectrometry (QQQ) were developed and applied in the analysis of 16 phthalic acid esters (PAEs) in the common drinking water. Qualitative and quantitative analysis were carried out by Multiple Reaction Monitoring (MRM). The method, combined with Solid Phase Extraction, was established to detect the PAEs in drinking water. As showed by the results, 16 PAEs had a good linearity in the range of 1.14~101.4μg/L, with correlation coefficient between 0.996~0.999. The mean recoveries were in the range of 87.53~131.37%, with the relative standard deviation be 0.71~5.09%. The limit of quantification (LOQ) of 16 PAEs were between 1.14~32.51μg/L, with the limit of detection (LOD) be 0.34~10.67μg/L. There were five PAEs which were detected in the range of <1.7~17.2μg/L in bottled water. Some products have some PAEs which havent been shown in the national or the international standard of the drinking water.

Abstract: In this work we studied the migration amount of formaldehyde in products of tripolycyanamide for food packaging. In order to review the rule of products of tripolycyanamide for food packaging, with different stimulant solutions, simulated temperatures and soaking time, the migration quantities of formaldehyde in products of tripolycyanamide for food packaging into deionized water, 3% acetic acid and 15% ethanol were measured by phenylhydrazine hydrochloride spectrophotometry. The amounts of formaldehyde migrated to 3 % acetic acid was higher than those of 15 % ethanol. Espousing in higher temperature , amount of formaldehyde of the products of tripolycyanamide were migrated more. And the total migrations of formaldehyde in three exposures was beyond the EU specific migration limits for formaldehyde (15 mg/L ).With the higher temperature exposure was done , the amount of formaldehyde migration reaches maximum in lower number of repeated exposures. We also discussed the formaldehyde migration rule for different surface roughness of food packaging materials.

Abstract: Content of residue bisphenol A from polycarbonate (PC) was measured used the technology of gas chromatography-mass spectrometry (GC-MS). Dichloromethane was used as solvent and methanol was used as precipitating agent. The solution was rotary evaporation after the polymer was filtered. The simple, rapid, sensitive and accurate method of external standard which linear range is 0.05-200.0mg/L, standard addition recoveries is 90.8% ~94.2% and RSD is 3.2% -4.5% was used to quantitative analysis. The influence of repeated using to the migration of bisphenol A was also studied in this experiment. The results show that with the reusing times increased, the migration content of bisphenol A was gradually reduced which reduced to 0.75mg/L at the sixth time from 2.4mg/L at the first time.

Abstract: Phthalic acid esters (PAEs) may be used as plasticizer and softener for the manufacturing of plastic products, especially in polyvinyl chloride (PVC). The residue of PAEs in food may affect human health. The method of qualitative analysis and quantitative analysis of 15 PAEs are established by total ion chromatogram (TIC) and select ion monitor (SIM) of gas chromatography-mass spectrometry (GC/MS). Combined with the solid phase extraction (SPE) method, PAEs residue of some fatty food in plastic packaging was detected, with the assessment of PAEs residual be discussed. The correlation coefficient was higher than 0.99. The limit of quantity was 2.93~105.23μg/kg and the limits of detection (LOD) for PAEs had values from 0.97μg/kg to 34.73μg/kg. This method was used for quantification of traces of PAEs in fatty food. The results showed that 9 PAEs residual in fatty food were at the range of <50~1160μg/kg and detection rates were between 16.67 %( 1:6) ~83.33 %( 5:6). None of them was out of national standard.

Abstract: At present, one-dimension codes are printed on food packaging, so is the bar code on the same kind of food. However, this method can only manage the same type of food. It cannot manage the single food. For this reason, we cant achieve the goal of tracing to the food source. The model of Internet of Things mainly includes the perceptual layer, the transport layer and the intelligent application layer. The perceptual layer recognizes objects through sensing devices and collects the exclusive identification on food, then connects to the wireless network or wire network through interface. In transport layer, by means of internet or LAN, the data which has already been collected by the perceptual is transferred to the information center or network administration center for processing and analyzing. According to the needs of tracing to food, the application layer source provides service call interface or API platform service to reach the depth integration of the information and traces to food source management, which can realize the intelligent operation management of food manufacturing and circulation. This paper proposes the Sense organs of Internet of Things, which is composed of the two-dimensional code technologies, RFID technology and sensor technology, wireless sensor networks or wired sensor networks composed of "nervous system". And then it makes full use of the variable information printing technology to print exclusive code on the single food packaging, and uses RFID reader register large quantities of food rapidly. It also uses database management software and user terminal to track the whole process of food production and circulation, in which food can be checked and inquired by network search platform.

Abstract: Taking full advantages of RFID technology relative to barcode, we collect the data of every link of organic vegetables including breeding, growing, fertilizing, farming, inspecting, harvesting, logistics and distribution. In view of the agricultural enterprises own characteristics, we develope the organic vegetables safety traceability system. In this system, not only can our customers take part in every link of organic vegetables traceabilty, but also purchase all kinds of rest asured organic vegetables online. The agricultural enterprise can also monitor each link of the organic vegetables. Linking to the governmental food security management platform, the system will not only enhance the food security management level, but also promote the healthy development of the agricultural industry.

Abstract: Fresh milk in people's diet structure position become more and more important, so a set of fresh milk processing and packaging logistics management system to establish is more and more urgent. RFID tag is the key factor to build the management system, which base on RFID technology realizing non-contacted long distance object recognition as the core. In this article, the principle and features of RFID tag are first introduced. Then material selection and tag reader layout are discussed in detail and designed feasibly. Finally the workflow, logical architecture and implementation strategy of fresh milk processing and packaging logistics management are studied.

Abstract: This article use the Internet of things technology, supply chain management and the combination of RFID and bar code to establish the traceability system for meat, achieve real-time monitoring and management, aimed at realize the traceability of pork, thus to strengthen the quality management, when quality problem occurs, judge the problem promptly and accurately, ensure food sanitation, promote the healthy development of meat industry.

Abstract: This paper is aimed at constructing RFID-based food safety supervision system, conducting hardware construction and RFID carrier design, building RFID middleware model, and putting forward RFID information encryption algorithm, to ensure that this system can realize collection, transmission, processing, and security management of food information, achieve scientific and transparent management of food, and improve the food safety supervision mechanism in China.