Na2CO3/NaHCO3对双酚A在水中溶解性的影响

Effects of NaCO/NaHCO on the Solubility of Bisphenol A

双酚A(BPA)的食源性暴露是一个严重的公共卫生安全隐患,食品加工中众多塑料材质的器具、管道中均含有BPA,为探讨常用食品酸度调节剂碳酸钠和碳酸氢钠对BPA暴露量的影响,对BPA在Na2CO3/NaHCO3溶液中的饱和浓度进行测量与分析。结果表明,两种酸度调节剂的浓度对BPA的溶解量有不同的影响。NaHCO3(0.1~1)mol·L-1对BPA的溶解有一定的抑制作用,BPA的饱和浓度(μg·mL-1)与NaHCO3浓度(mol·L-1)的对数值是线性负相关的。与碳酸氢钠不同,Na2CO3在较低浓度时(0.01 mol·L-1)能显著促进BPA的溶解,随着浓度的增加[(0.01~0.75)mol·L-1],促进作用愈加显著;在较高浓度时[(0.75~2)mol·L-1]对BPA溶解的促进作用反而减弱。BPA的饱和浓度(μg·mL-1)与Na2CO3浓度(mol·L-1)的对数值在两个浓度区间分别满足线性正相关和负相关数学模型。因此,Na2CO3的使用会促进BPA向食品转移,从而增加食源性BPA的暴露量。

Food borne Bisphenol A(BPA) exposure acts as a serious potential security hazard in public health. Various devices and pipes made from plastic contain BPA. To evaluate effects of Na2CO3 and NaHCO3 on the BPA exposure, saturated concentrations of BPA in various concentrations of Na2CO3/NaHCO3 solution are studied. Na2CO3 and NaHCO3 display different effects towards BPA dissolution. NaHCO3(0.1~1) mol·L-1 can decrease BPA dissolution. It is further found that there exists a linear negative correlation between the saturated BPA concentrations(μg·mL-1) and logarithm of NaHCO3(mol·L-1). In contrast to NaHCO3, Na2CO3 can significantly prompt the dissolution of BPA even at a low concentration(0.01 mol · L-1). The saturated BPA(μg·mL-1) and logarithm of the concentrations of Na2CO3[(0.01~0.75) mol·L-1] present a good linear positive correlation.When the level of Na2CO3 bypass 0.75 mol·L-1, the promotion of BPA dissolution is weakened. It is further found a linear negative correlation can well describe the relations between the saturated BPA(μg · mL-1) and logarithm of the Na2CO3 concentrations [(0.75~2) mol·L-1]. This study suggests that usage of Na2CO3 can promote the transfer of BPA to food and correspondingly result in an increased risk of food bone BPA exposure.