China Plastics ›› 2022, Vol. 36 ›› Issue (5): 127-132.DOI: 10.19491/j.issn.1001-9278.2022.05.021

• Plastic and Environment • Previous Articles     Next Articles

Study on material identification and total migration of biodegradable plastic shopping bags used for food contact

WU Xiongjie1,2, TAO Qiang1,2(), ZHU Dongbo1,2, CHENG Jinsong1,2, CHU Yu1,2, XU Lei1,2   

  1. 1.Anhui Province Packaging and Printing Product Quality Supervision and Inspection Center,Tongcheng 231400,China
    2.National Polymer Material Quality Inspection and Testing Center(Anhui),Tongcheng 231400,China
  • Received:2021-12-21 Online:2022-05-26 Published:2022-05-26

Abstract:

The materials obtained from six types of commercially available biodegradable plastic shopping bags (samples 1#~6#) for food contact were identified by an infrared spectrometer, their total migration amounts were measured under different soaking conditions, and the evaporation residue components of some samples were investigated. The results showed that the qualitative results of the materials from the bag samples 2# and 4# were inconsistent with those as the materials marked. The total migration amount of the biodegradable plastic shopping bags was much greater than that of the traditional polyethylene plastic shopping bags. The total migration results of the 2#~6# samples exceeded the required limit (10 mg/dm2) when immersed in 4 vol% acetic acid simulation solution. So did the samples 1#~6# when immersed in 95 vol% ethanol simulant solution. This indicates that there was a certain food safety risk when biodegradable plastic shopping bags were directly used for food contact. The PBAT in the bag samples could be dissolved in 95 vol% ethanol. The CaCO3 in the samples presented a large migration amount in the 4 vol% acetic acid simulation solution, which was attributed to the migration mass of CaCO3 as well as the calcium acetate formed by the reaction between CaCO3 and acetic acid. Starch particles could gelatinize and fall off in the water, and acetic acid could enter the starch particles to destroy the molecular structure of starch, resulting in a significant increase in the total migration of biodegradable plastic shopping bags compounded with starch.

Key words: Fourier?transform infrared spectrometer, biodegradable plastic shopping bags for food contact, total migration, food safety, evaporation residue

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