Carbon dioxide was markedly detected in golden drop, and its
level increased with storage time (Tables 1 and 2). At lower temperature,
more CO2 is adsorbed into the food matrix, while at higher
temperature less is adsorbed. For gaseous specie, its corresponding
vapor pressure is very high. Generally, it was found that the vapor
pressure of CO2 increases more and more rapidly with rise of temperature
[16]. Carbon dioxide tends to be released from the food
matrix into the headspace; thus, a quantification analysis can be
performed by measuring headspace CO2 content using GC. Since
the GC column is operating at 30 ◦C, any water vapor entering
the column will condense, which may affect the column separation
performance. Thus, the temperature of 60 ◦C was chosen as a
compromise between reducing CO2 solubility (high temperature)
and minimizing water vapor in the headspace (low temperature)