The TEM image of the TEPA-MP revealed that the TEPA-MP synthesized
in this study was multidispersed with an average diameter of
It could be due to the
electrostatic attraction between protonated amino groups of TEPA-MP
and ionized [COO]− and [N]− groups of food additives. In order
to obtain satisfactory recoveries of nine food additives, the effect of
the wine pH value on the recoveries was studied. Series of experiments
were performed by mixing 50 mg TEPA-MP with 10.0 mL wine sample
spiked at 10.0 mg/Lwith varying pH values from0.5 to 7.0 in a 15.0 mL
glass centrifuge tube, as shown in Fig. 3.