Supercritical as this process involves selectivity (Pan et al.,

Supercritical fluid
extraction using carbon dioxide technology (SC-CO2 technology) uses
pressure coupled with carbon dioxide to eliminate microorganisms  affecting the nutritional components,
organoleptic attributes,emerging alterrnative for pasteurization of bioactive
compounds in various medicines and foods (Jimenez-Sanchez et al., 2017 ) in which different 
compounds would be eliminated by conventional thermal techniques (Vigano
et al., 2015).The  main driving force for any extraction process
is the solubility of the target compound in the selected solvents which depend
on the interactions between the two i.e 
solute and solvent. Supercritical
fluid extraction  has emerged as a
efficient  alternative  technology  for extraction of bioactive components  from natural products because of  reduction in extraction time, minimal consumption
of organic solvents and being suitable for thermally sensitive substance, production
of cleaner and greener extracts which are  environmental friendly (Taylor et al., 1997). Supercritical
fluid extraction technique  is based on
the solvating/ solublising properties of supercritical fluid  which are 
obtained by employing temperature and pressure over the critical point of
a mixture, compound or element.By proper control of SFE parameters, the
extracting prowess of supercritical fluid can also be modified/enhanced which
enable this process to find its application from food to pesticide researches. Even
though CO2 is the sought after  extraction solvent (for extracting non-polar
compounds), the polarity of supercritical SC-CO2 can be altered by
the adding miscible polar compound like  ethanol as modifier (Sanchez-Camargo et al., 2014).the extracts obtained by  this technique have low concentration of
undesirable compounds as this process involves selectivity (Pan et al., 2014). Morover SC-CO2
becomes gaseous after depressurization and can be easily flushed out from a  system (da Silva et al., 2016).