Effect Investigation of Scrap Addition Ratio on Recycled Food Contact Polyethylene Films Based on GC£­MS and Chemometrics

KeyWord:scrap  recycled polyethylene  gas chromatography£­mass spectrometry£¨GC£­MS£©  chemometrics

Abstract:

      The color and overall migration of recycled polyethylene£¨PE£© films containing different proportion of scraps were determined£®The volatile substances were screened by gas chromatography£­mass spectrometry£¨GC£­MS£©£¬and the different substances were analyzed by chemometrics£®The experimental results showed that the addition of scraps exerted a negligible effect on the color of the single-layer recycled film£¬while the total migration of the virgin and recycled PE films in four food simulants was less than the safety limit of 10 mg/dm2£®A total of 90 volatile organic compounds were detected by GC£­MS£¬mainly including aliphatic hydrocarbons£¬additives and their degradation products and impurities£®The recycled PE films were divided into three categories by using principal components analysis£¨PCA£© and orthogonal partial least squares£­discriminate analysis£¨OPLS£­DA£© models£®The recycled PE films were similar to the original film when the contents of scrap were lower than 10%£®Further evaluation was needed when the contents of scrap were between 10% and 50%£¬and more attention was needed at higher than 50%£®Moreover£¬V£­plot was constructed to screen 26 characteristic components that caused the sample differences£¬mainly aliphatic hydrocarbons£¬followed by additives and their degradation products£¬such as the degradation products of dodecanamide£¬nonanal and antioxidant 1010£®This study provided a reference for the application of ¡°film to film¡± recycling of food contact scraps.