The anion (chloride, nitrate, phosphate, sulphate and oxalate) composition of water
used to wash spinach during processing (frozen and canned) was determined by Ion
Chromatography (IC). The results showed the anions to increase in the water during
washing of raw spinach and during the freezing and canning processes. Thus the
anion content of the spinach itself was reduced. This observation has important
health implications, particularly for people suffering with kidney stones for whom
it is essential to seek ways of reducing oxalate intake. It is also important for
improving quality and reducing the level of contaminants (such as nitrates) according
to EU Commission proposed levels. The lower concentration of nitrates,
oxalates and other toxic components is especially beneficial for those who follow
the recommendation to eat five or more servings of a combination of vegetables and
fruits, especially green and yellow vegetables and citrus fruits each day.