Özlem Çağındı, Özlem Kızılırmak Esmer

Polikarbonat Su Damacanalarının Bisfenol-A Kalıntı Miktar ve Migrasyonu Açısından Güvenliği

Polikarbonat (PC) malzemeler, sahip olduğu özellikleri itibariyle içme sularının ambalajlanmasında oldukça yaygın olarak kullanılan malzemelerdir. PC malzeme; monomeri olan Bisfenol-A (BPA)’dan dolayı gıda ambalajı olarak kullanımına dair BPA migrasyonu açısından bazı endişeler yaratmaktadır. Bu nedenle bu araştırmada yeni (hiç kullanılmamış) ve eski (kullanım ömrünü tamamlamış) PC su damacanalarının kalıntı BPA miktarları açısından kalitelerinin değerlendirilmesi; depolama sıcaklığı ve depolama süresinin BPA migrasyonu üzerine etkisinin belirlenmesi amaçlanmıştır. BPA kalıntı analizi ve BPA migrasyon analizi Floresans Dedektörlü Yüksek Basınç Sıvı Kromatografisi kullanılarak gerçekleştirilmiştir. Bu amaçla, üç farklı temas sıcaklığı (5, 20 ve 40ºC) ve yedi farklı depolama süresinde (1., 5., 10., 20., 30., 45. ve 60. gün) depolama yapılarak BPA migrasyon miktarları belirlenmiştir. Çalışma sonucunda PC damacana örneklerinin BPA kalıntı miktarlarının düşük olduğu ve damacanaların eski olması durumunda yeni damacanalara göre daha düşük ya da daha yüksek kalıntı BPA miktarlarına sahip olabileceği tespit edilmiştir. BPA migrasyon miktarlarının ise sıcaklığa ve süreye bağlı olarak artış gösterdiği ve damacanaları güneş ışığı altında depolamanın BPA migrasyon miktarlarını artırdığı tespit edilmiştir. Tüm depolama koşullarında tespit edilen BPA migrasyon miktarlarının, BPA için belirtilen spesifik migrasyon limitinin oldukça altında olduğu belirlenmiştir. 60 kilogram ağırlığındaki bir kişinin BPA’nın tolere edilebilir günlük alım miktarına (4 mikrogram/ 60kg vücut ağırlığı-gün) ulaşmak çin, en kötü depolama koşulunda (40ºC/60 gün) bir günde 16 litre su tüketmesi gerektiği hesaplanmıştır. Ancak günlük koşullar dikkate alındığında bu miktarda su içilmesi olası değildir. Bu nedenlerle, gerçekleştirilen bu çalışma sonucunda, belirtilen koşullar altında kullanıldığında polikarbonat su damacanalarının BPA migrasyonu açısından bir risk teşkil etmediği belirlenmiştir.

Safety of Polycarbonate Water Carboys for Residual and Migration Levels of Bisphenol-A

Polycarbonate (PC) materials are widely used for the packaging of drinkable water. The use of PC materials as foodpackaging raises some concerns for the migration of Bisphenol A (BPA), which is the monomer of PC. Therefore, inthis research, it was aimed to determine the quality of new (not used before) and old (life time ended) PC watercarboys in terms of residual BPA and BPA migration levels with respect to storage conditions. For thispurpose, BPA migration was determined by storing at three different temperatures (5, 20 and 40C) for sevendifferent storage times (1., 5., 10., 20., 30., 45. and 60 days.) Residual and migrated BPA levels were determined byHigh Performance Liquid Chromatography with Fluorescence Detector. As a result, PC water carboys contained lowlevels of residual of BPA, and lower or higher residual BPA levels were detected in old materials compared to newmaterials. The BPA migration level increased by temperature and time, and storage under sunlight increased thelevel of BPA migration. BPA migration levels under all storage conditions were below the specific migration limit forBPA. In order to reach the tolerable daily intake of BPA even under the worst storage condition of PC water carboys,daily water consumption was calculated as 16 liters for a person with a body weight of 60 kg. On the other hand, thisdaily water consumption might not be rational for a person. Therefore, it was concluded that PC water carboyspossessed no risk in terms of BPA migration levels under the conditions studied.

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