食品软包装材料中残留有害物研究

Research on Harmful Residue in Food Flexible Packaging Material

利用气相色谱-质谱技术,分别对原膜OPP、印刷后的面层OPP/INK、面层与阻隔层复合材料OPP/INK/AD/VMPET、成品膜OPP/INK/AD/VMPET/AD/CPP中残留的有害物成分进行定性定量分析。研究结果表明:固相微萃取、超声提取、索式提取3种样品前处理方法中,超声提取方法既可用于定性分析,又可用于定量分析,而固相微萃取适合作为成品膜的定性分析,故选用超声提取为试样前处理方法;4种萃取溶剂对邻苯二甲酸单乙二醇酯的提取率依次为二氯甲烷>正己烷>甲醇/乙酸乙酯>丙酮;储存时间对面层基材中残留有害物乙酸丁酯的影响较大,对增塑剂邻苯二甲酸单乙二醇酯的影响较小,对印刷后的面层、中间层、成品膜中残留有害物的影响较大;相对含量较高的邻苯二甲酸单乙二醇酯主要来源于OPP/INK/AD/VMPET在干式复合工序中添加的化学助剂和黏合剂,乙酸丁酯主要来自印刷工序油墨中的有机溶剂,成品膜中邻苯二甲酸单乙二醇酯的残留量为38.74 mg/kg,乙酸丁酯的残留量为20.54 mg/kg。

Using the technology of gas chromatography-mass spectrometry, the qualitative and quantitative researches were conducted to analyze the harmful residue ingredients in the original film, the surface of OPP, OPP/INK after printing, the surface layer and barrier layer composite material of OPP/INK/AD/OPP/VMPET, finished product membrane of INK/AD/VMPET/AD/CPP. The results showed that in the three sample preparation methods of solid phase microextraction, ultrasonic extraction and Soxhlet extraction, ultrasonic extraction method could be used for both of qualitative and quanti- tative analysis, while solid phase microextraction could be used for qualitative analysis of finished films, therefore, ultra- sonic extraction was chosen for sample pretreatment; the extraction efficiency of four kinds of extraction solvent to phthalic acid glycol ester was methylene chloride 〉 n-hexane/ethyl acetate 〉 acetone 〉 methanol. The influence of storage time is great on butyl acetate with residue on the surface of base material, less on plasticizer phthalic acid glycol ester, but great on harmful residues of the surface, interlayer and finished products. Most ofphthalic acid glycol ester mainly came from added chemical agents and adhesives in OPP/INK/AD/VMPET in dry compound process, while butyl acetate were mainly from the organic solvent ink in the printing process. The residue ofphthalic acid glycol ester in the finished film was 38.74 mg/kg, and the residue of butyl acetate was 20.54 mg/kg.