During
the cooking process the soy slurry wants to foam up. To fight this
there are two methods used:
1. Most Soy companies use anti-foaming agents, chemicals that may
not be listed on the list of ingrediants.These
chemicals are either made from ground limestone and acidified vegetable
oil or with calcium carbonate and animal fats. Silicone defoamers
are the most widely used which has an active ingredient called diemethyl
polysiloxane. Using defoamers changes the pH of the curds resulting
in a lower quality tofu.
2. We
use a constant water spray, we add no chemicals to the process and
the water we
use is filtered to eliminate heavy metals and chlorine inherent
in San Diego water. It is also put through an ultra violet light,
which kills all bacteria.
The
coagulant added to the soy milk to make Tofu comes in two distinct
and very different forms:
1.
Calcium
sulfate is the most widely used chemical in making tofu. Calcium
sulfate is a food grade gypsum, the same chemical that is in wallboard
in your home, plaster of Paris, and chalk. Using this chalk as a
coagulant gives a higher yield of tofu per quantity of soybeans
used, meaning greater profits for the companies using it.
2.
We
use Nigari. Nigari is derived from seawater and its chemical name
is magnesium chloride. Using Nigari is not as profitable, but the
result is a much higher grade Tofu, much firmer Tofu and a much
higher protein content.