Genetic effect of migratory compounds from bottled natural drinking water stored under direct sunlight

Abstract EN

The drinking water is one of the important routes for human exposure to contaminants through releasing of antimony (Sb) and polymers from polyethylene terephthalate (PET) plastic.

The aim of this study was to investigate the effect of sunlight on chemical compounds migration into PET-bottled water and studying the cytotoxicity of di-butyl phthalate (DBP) and di-octyl phthalate (DOP) by SMART in Drosophila melanogaster.

Four random water bottle samples produced by various companies as: A (PET, clear, 0.6L), B (PET, clear, 1.5L), C (PET, blue, 1.5L) and D (pol-ycarbonate PC, blue, 19L) for studying the effect of direct sunlight exposure on migration of antimony and phthalates.

Experiment was carried out in the presence of sunlight (7 h daily) for 210 day.

The migrated compounds profile (μg/L) that detected sample (A) before storage were only two com-pounds formaldehyde (FA) and acetaldehyde (AA) out of nine compounds.

During storage under sunlight, four compounds (Sb), bis-phenol A (BPA), dimethyl phthalate (DMP) and diethyl phthalate (DEP) were increased till 30th day then did not affect till the end of storage.

Other detected com-pounds were continuously progressed till the end of storage with different rates.

The highest rate was appeared in case of FA, it was 222 fold fol-lowed by DOP compound (173 fold) as well as DBP (75.3 fold) and finally the AA compound with 17.9 fold.

Regarding to another sample B, only 3 compounds (BPA, DMP and DBP) were not de-tected at zero time.

The AA compound was de-tected with the highest concentration (0.9μg/L) and the lowest one was DOP (0.007μg/L).

Only four compounds were detected before storage named Sb, DOP, FA and AA, the lowest level (0.006μg/L) was noticed in DOP, while the moderate level was recorded in FA (0.03μg/L) and Sb (0.08μg/L).

Oth-er detected compounds; i.e.

DBP, DOP, AA and FA were consequently increased with higher lev-els.

This study investigated genotoxic effects of (DBP) and (DOP) at 30μg/ml concentration using the somatic mutation and recombination test (SMART).

The cytotoxicity of the tested phthalate compounds was also assessed at five different concentrations 0.5, 1, 5, 10 and 20μg/ml in two types of human cell lines; liver cancer (HepG2), colon cancer (HCT-116) using neutral red cytotoxi-city assay.

All of tested compounds significantly showed high levels of tumor induction and fre-quency compared to the negative control in SMART assay.

It was also reduced the viability of the HepG2 cell lines cells using different concen-trations and the highest cytotoxic effect.

While, on HCT-116 showed no cytotoxic effect.