A domestic carbonator (Mr. Butlers Instafizz, Kerala) was
modified by fitting it to a 1 kg CO2 gas cylinder with
necessary attachments of regulators and pressure gauges.
This system was utilized for injecting CO2 gas into the
beverage samples. The system was leak- tested before each
trial using the standard soap bubble test. The glass bottles
containing FDD was placed on the platform in such a
manner that the gas injection pipe remained dipped in the
sample during carbonation. The platform lever was operated
to raise the bottle to snugly fit to the top seal ring. The
pressure of the gas in the injection line was manually
adjusted to required levels and the gas was then flushed into
the beverage by pressing the injection button for the required
time. At the end of carbonation, the bottle platform was
lowered; the bottle collected and immediately capped with
gas leak proof screw caps.