Migration Study Of Harmful Substances In Paper Cup

In production and subsequent processing process, many kinds of chemical materials were added in paper packaging material contacted with food in order to give a specific function. If these substances were added improperly, they can remain in paper and migrate into food and then threaten human body health. Using the most common paper material in life-paper cup as target, this topic studied migration regular pattern of harmful substances to provide parameter foundation for safety engineering regulations of paper packaging.First of all, harmful composition in commercial paper cups was analyzed. Three kinds of paper cup sample were extracted using soxhlet extraction with absolute ethyl alcohol, and then extracting solution were analyzed by GC-MS. After summary by contrast, there were paraffin, olefins, acid, aldehydes, esters, ketones, alcohol, phenol and heterocyclic in the extracting solution of paper cup samples, that was roughly the same with substances added in paper cup in practical production.Distribution coefficient is an important parameters of migrating ability. Kpaper/air of simulation pollutants in paper cup samples was studied by micro drop method in this paper. Dibutyl phthalate(DBP) and benzophenone were chosen as organic simulation pollutants. The results indicated that paper cup properties, temperature and chemical properties of pollutants play important role in their Kpaper/air value. The higher of temperature, the lower of Kpaper/air value would be and comtaminants would take off more easily from paper cup. At70℃, the Kpaper/air value range of DBP and benzophenone was105.723-1638.894、67.469-991.849; while28.661-360.978、7.506-407.225at100℃. The absorption capacity of different paper cup sample was different. The higher of thickness、quantitate、tightness, pollutants would take off more difficultly. Besides, Kpaper/air value was also connected with chemical properties of compounds. The lower boiling point and the better volatilization, the lower Kpaper/air value would be. Benzophenone took off from paper cup and migrated into food more easily than DBP.The law of DBP、benzophenone’s migration from paper cup samples into food simulation was studied by HPLC. The results showed that the lower of thickness、 quantitate、tightness, model compounds would transfer from paper cup into food simulation more easily, and migration would get equilibrium faster. The higher concentration of alcohol, pollutants would migrate more easily and migration would get equilibrium faster. The migration was connected with chemical property of compounds, the range of DBP’s mobility was13%～37.1%while benzophenone’s was44.4%～65.1%. Benzophen transferred more easily, which was consistent with predicted result of Kpaper/air value. The experimental data was analyzed by "1stOpt". It was resulted that the migration law of DBP from paper to alcohol was according with formula while benzophenone was according with formulaThe migration of flurescent whitening agent-DSD acid was determined by molecular fluorescence spectrophotometry. It was resulted that ethanol concentration had a major influence to the migration of DSD acid. When the concentration of ethanol increased by5%to55%, the concentration of DSD acid increased from7.2-9.3mg/l to9.7-12.6mg/l, absolute amout between2.5and2.7mg/l. The temperature also had certain effect to the migration of DSD acid. The higher of temperature, DSD acid would migrate more easily. The temperature of water rised from25℃to85℃, the concentration of DSD acid increased from7.9-10.9mg/1to9.7-12.4mg/l, absolute amout between1.8and1.5mg/l.This paper’s results can provide data foundation for migration prediction model of harmful substances in paper packaging material, and can provide theory parameters for related departments to set the standards of paper cup or paper packaging material.