Evaluation of Off-Odors in Food Packaging— the Role of Conjugated Unsaturated Carbonyl Compounds

Abstract

Several reactions between components of packaging materials lead under certain circumstances to sensorially active compounds, which dimmish the quality of the package and often the quality of the packaged food The conjugated unsaturated car bonyl compounds constitute an important class with may examples of such reaction products with off-odor properties This paper will attempt to evaluate off-odors in special consideration of this class of organic compounds

Food/Package Compatibility and Migration

“…Usually, it is only possible to make a synthesis of the assumed substance and compare its mass spectrum with that of the interference material to see whether the structure of the odor is correct. The difficulties of such analytical work are caused by «,~3-unsaturated aldehydes and ketones having odor threshold values of 10-4 to 10-5 mg/m3 for compounds with seven, eight, nine or ten carbon atoms [14].…”

Analysis of taints and off-flavours

“…Some monomers, although not odorous, can form degradation products, such as acetaldehyde, which have been known to cause taints in beverages (Lorusso, 1985). Similarly, oxidation compounds have been identified, such as 1-hepten-3-one and 1-nonenal (Koszinowski and Piringer, 1986).…”

Determinação de compostos carbonilados e carboxilados em derivados de petróleo

“…[1][2][3][4] As estruturas dos compostos carbonílicos e carboxílicos lineares C1-C5, bem como a ocorrência, uso e toxicologia dos mesmos são apresentadas na Tabela 1.…”

“…Traços de compostos carbonílicos e carboxílicos voláteis presentes no petróleo, suas frações, e especialmente em derivados da primeira geração da indústria petroquímica, tais como eteno e propeno que são utilizados como precursores para produção de resinas termoplásticas (polietileno e polipropileno), podem afetar a qualidade das embalagens obtidas a partir desses materiais, comprometendo o sabor dos alimentos. [1][2][3][4][5] Além disso, a presença de tais contaminantes provoca a diminuição da atividade e envenenamento não permanente em catalisadores da primeira geração e permanente da segunda geração da indústria petroquímica.…”